mc/server/player/player.go

package player

import (
	"fmt"
	"math"
	"math/rand/v2"
	"net"
	"slices"
	"strings"
	"sync"
	"time"

	"github.com/df-mc/dragonfly/server/player/debug"
	"github.com/df-mc/dragonfly/server/player/hud"

	"github.com/df-mc/dragonfly/server/block"
	"github.com/df-mc/dragonfly/server/block/cube"
	"github.com/df-mc/dragonfly/server/block/model"
	"github.com/df-mc/dragonfly/server/cmd"
	"github.com/df-mc/dragonfly/server/entity"
	"github.com/df-mc/dragonfly/server/entity/effect"
	"github.com/df-mc/dragonfly/server/event"
	"github.com/df-mc/dragonfly/server/item"
	"github.com/df-mc/dragonfly/server/item/enchantment"
	"github.com/df-mc/dragonfly/server/item/inventory"
	"github.com/df-mc/dragonfly/server/player/bossbar"
	"github.com/df-mc/dragonfly/server/player/chat"
	"github.com/df-mc/dragonfly/server/player/dialogue"
	"github.com/df-mc/dragonfly/server/player/form"
	"github.com/df-mc/dragonfly/server/player/scoreboard"
	"github.com/df-mc/dragonfly/server/player/skin"
	"github.com/df-mc/dragonfly/server/player/title"
	"github.com/df-mc/dragonfly/server/session"
	"github.com/df-mc/dragonfly/server/world"
	"github.com/df-mc/dragonfly/server/world/particle"
	"github.com/df-mc/dragonfly/server/world/sound"
	"github.com/go-gl/mathgl/mgl64"
	"github.com/google/uuid"
	"golang.org/x/text/language"
)

type playerData struct {
	xuid              string
	locale            language.Tag
	nameTag, scoreTag string
	absorptionHealth  float64
	scale             float64

	gameMode world.GameMode
	skin     skin.Skin
	s        *session.Session
	h        Handler

	inv, offHand, enderChest, ui *inventory.Inventory
	armour                       *inventory.Armour
	heldSlot                     *uint32

	sneaking, sprinting, swimming, gliding, crawling, flying,
	invisible, immobile, onGround, usingItem bool

	sleeping bool
	sleepPos cube.Pos

	usingSince time.Time

	glideTicks   int64
	fireTicks    int64
	fallDistance float64

	breathing         bool
	airSupplyTicks    int
	maxAirSupplyTicks int

	cooldowns map[string]time.Time

	speed               float64
	flightSpeed         float64
	verticalFlightSpeed float64

	health     *entity.HealthManager
	experience *entity.ExperienceManager
	effects    *entity.EffectManager

	lastXPPickup *time.Time

	lastDamage  float64
	immuneUntil time.Time

	deathPos       *mgl64.Vec3
	deathDimension world.Dimension

	enchantSeed int64

	mc *entity.MovementComputer

	collidedVertically, collidedHorizontally bool

	breaking          bool
	breakingPos       cube.Pos
	breakingFace      cube.Face
	lastBreakDuration time.Duration

	breakCounter uint32

	hunger *hungerManager

	once sync.Once

	prevWorld *world.World
}

// Player is an implementation of a player entity. It has methods that implement the behaviour that players
// need to play in the world.
type Player struct {
	tx     *world.Tx
	handle *world.EntityHandle
	data   *world.EntityData
	*playerData
}

func (p *Player) H() *world.EntityHandle {
	return p.handle
}

func (p *Player) Tx() *world.Tx {
	return p.tx
}

// Name returns the username of the player. If the player is controlled by a client, it is the username of
// the client. (Typically the XBOX Live name)
func (p *Player) Name() string {
	// TODO: This isn't correct, this will change if the nametag changes.
	return p.data.Name
}

// UUID returns the UUID of the player. This UUID will remain consistent with an XBOX Live account, and will,
// unlike the name of the player, never change.
// It is therefore recommended using the UUID over the name of the player. Additionally, it is recommended to
// use the UUID over the XUID because of its standard format.
func (p *Player) UUID() uuid.UUID {
	return p.handle.UUID()
}

// XUID returns the XBOX Live user ID of the player. It will remain consistent with the XBOX Live account,
// and will not change in the lifetime of an account.
// The XUID is a number that can be parsed as an int64. No more information on what it represents is
// available, and the UUID should be preferred.
// The XUID returned is empty if the Player is not connected to a network session or if the Player is not
// authenticated with XBOX Live.
func (p *Player) XUID() string {
	return p.xuid
}

// DeviceID returns the device ID of the player. If the Player is not connected to a network session, an empty string is
// returned. Otherwise, the device ID the network session sent in the ClientData is returned.
func (p *Player) DeviceID() string {
	if p.session() == session.Nop {
		return ""
	}
	return string(p.session().ClientData().DeviceID)
}

// DeviceModel returns the device model of the player. If the Player is not connected to a network session, an empty
// string is returned. Otherwise, the device model the network session sent in the ClientData is returned.
func (p *Player) DeviceModel() string {
	if p.session() == session.Nop {
		return ""
	}
	return p.session().ClientData().DeviceModel
}

// SelfSignedID returns the self-signed ID of the player. If the Player is not connected to a network session, an empty
// string is returned. Otherwise, the self-signed ID the network session sent in the ClientData is returned.
func (p *Player) SelfSignedID() string {
	if p.session() == session.Nop {
		return ""
	}
	return p.session().ClientData().SelfSignedID
}

// Addr returns the net.Addr of the Player. If the Player is not connected to a network session, nil is returned.
func (p *Player) Addr() net.Addr {
	if p.session() == session.Nop {
		return nil
	}
	return p.session().Addr()
}

// Skin returns the skin that a player is currently using. This skin will be visible to other players
// that the player is shown to.
// If the player was not connected to a network session, a default skin will be set.
func (p *Player) Skin() skin.Skin {
	return p.skin
}

// SetSkin changes the skin of the player. This skin will be visible to other players that the player
// is shown to.
func (p *Player) SetSkin(skin skin.Skin) {
	ctx := event.C(p)
	if p.Handler().HandleSkinChange(ctx, &skin); ctx.Cancelled() {
		p.session().ViewSkin(p)
		return
	}
	p.skin = skin
	for _, v := range p.viewers() {
		v.ViewSkin(p)
	}
}

// Locale returns the language and locale of the Player, as selected in the Player's settings.
func (p *Player) Locale() language.Tag {
	return p.locale
}

// Handle changes the current Handler of the player. As a result, events called by the player will call
// handlers of the Handler passed.
// Handle sets the player's Handler to NopHandler if nil is passed.
func (p *Player) Handle(h Handler) {
	if h == nil {
		h = NopHandler{}
	}
	p.h = h
}

// Message sends a formatted message to the player. The message is formatted following the rules of
// fmt.Sprintln, however the newline at the end is not written.
func (p *Player) Message(a ...any) {
	p.session().SendMessage(format(a))
}

// Messagef sends a formatted message using a specific format to the player. The message is formatted
// according to the fmt.Sprintf formatting rules.
func (p *Player) Messagef(f string, a ...any) {
	p.session().SendMessage(fmt.Sprintf(f, a...))
}

// Messaget sends a translatable message to a player and parameterises it using
// the arguments passed. Messaget panics if an incorrect amount of arguments
// is passed.
func (p *Player) Messaget(t chat.Translation, a ...any) {
	p.session().SendTranslation(t, p.locale, a)
}

// SendPopup sends a formatted popup to the player. The popup is shown above the hotbar of the player and
// overwrites/is overwritten by the name of the item equipped.
// The popup is formatted following the rules of fmt.Sprintln without a newline at the end.
func (p *Player) SendPopup(a ...any) {
	p.session().SendPopup(format(a))
}

// SendTip sends a tip to the player. The tip is shown in the middle of the screen of the player.
// The tip is formatted following the rules of fmt.Sprintln without a newline at the end.
func (p *Player) SendTip(a ...any) {
	p.session().SendTip(format(a))
}

// SendJukeboxPopup sends a formatted jukebox popup to the player. This popup is shown above the hotbar of the player.
// The popup is close to the position of an action bar message and the text has no background.
func (p *Player) SendJukeboxPopup(a ...any) {
	p.session().SendJukeboxPopup(format(a))
}

// SendToast sends a toast to the player. This toast is shown at the top of the screen, similar to achievements or pack
// loading.
func (p *Player) SendToast(title, message string) {
	p.session().SendToast(title, message)
}

// ResetFallDistance resets the player's fall distance.
func (p *Player) ResetFallDistance() {
	p.fallDistance = 0
}

// FallDistance returns the player's fall distance.
func (p *Player) FallDistance() float64 {
	return p.fallDistance
}

// SendTitle sends a title to the player. The title may be configured to change the duration it is displayed
// and the text it shows.
// If non-empty, the subtitle is shown in a smaller font below the title. The same counts for the action text
// of the title, which is shown in a font similar to that of a tip/popup.
func (p *Player) SendTitle(t title.Title) {
	p.session().SetTitleDurations(t.FadeInDuration(), t.Duration(), t.FadeOutDuration())
	if t.Text() != "" || t.Subtitle() != "" {
		p.session().SendTitle(t.Text())
		if t.Subtitle() != "" {
			p.session().SendSubtitle(t.Subtitle())
		}
	}
	if t.ActionText() != "" {
		p.session().SendActionBarMessage(t.ActionText())
	}
}

// SendScoreboard sends a scoreboard to the player. The scoreboard will be present indefinitely until removed
// by the caller.
// SendScoreboard may be called at any time to change the scoreboard of the player.
func (p *Player) SendScoreboard(scoreboard *scoreboard.Scoreboard) {
	p.session().SendScoreboard(scoreboard)
}

// RemoveScoreboard removes any scoreboard currently present on the screen of the player. Nothing happens if
// the player has no scoreboard currently active.
func (p *Player) RemoveScoreboard() {
	p.session().RemoveScoreboard()
}

// SendBossBar sends a boss bar to the player, so that it will be shown indefinitely at the top of the
// player's screen.
// The boss bar may be removed by calling Player.RemoveBossBar().
func (p *Player) SendBossBar(bar bossbar.BossBar) {
	p.session().SendBossBar(bar.Text(), bar.Colour().Uint8(), bar.HealthPercentage())
}

// RemoveBossBar removes any boss bar currently active on the player's screen. If no boss bar is currently
// present, nothing happens.
func (p *Player) RemoveBossBar() {
	p.session().RemoveBossBar()
}

// Chat writes a message in the global chat (chat.Global). The message is prefixed with the name of the
// player and is formatted following the rules of fmt.Sprintln.
func (p *Player) Chat(msg ...any) {
	message := format(msg)
	ctx := event.C(p)
	if p.Handler().HandleChat(ctx, &message); ctx.Cancelled() {
		return
	}
	_, _ = fmt.Fprintf(chat.Global, "<%v> %v\n", p.Name(), message)
}

// ExecuteCommand executes a command passed as the player. If the command could not be found, or if the usage
// was incorrect, an error message is sent to the player. This message should start with a "/" for the command to be
// recognised.
func (p *Player) ExecuteCommand(commandLine string) {
	if p.Dead() {
		return
	}
	args := strings.Split(commandLine, " ")

	name, ok := strings.CutPrefix(args[0], "/")
	if !ok {
		return
	}

	command, ok := cmd.ByAlias(name)
	if !ok {
		o := &cmd.Output{}
		o.Errort(cmd.MessageUnknown, name)
		p.SendCommandOutput(o)
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleCommandExecution(ctx, command, args[1:]); ctx.Cancelled() {
		return
	}
	command.Execute(strings.Join(args[1:], " "), p, p.tx)
}

// Transfer transfers the player to a server at the address passed. If the address could not be resolved, an
// error is returned. If it is returned, the player is closed and transferred to the server.
func (p *Player) Transfer(address string) error {
	addr, err := net.ResolveUDPAddr("udp", address)
	if err != nil {
		return err
	}

	ctx := event.C(p)
	if p.Handler().HandleTransfer(ctx, addr); ctx.Cancelled() {
		return nil
	}
	p.session().Transfer(addr.IP, addr.Port)
	return nil
}

// SendCommandOutput sends the output of a command to the player.
func (p *Player) SendCommandOutput(output *cmd.Output) {
	p.session().SendCommandOutput(output, p.locale)
}

// SendDialogue sends an NPC dialogue to the player, using the entity passed as the entity that the dialogue
// is shown for. Dialogues can be sent on top of each other without the other closing, making it possible
// to have non-flashing transitions between menus compared to forms. The player can either press one of the
// buttons or close the dialogue. It is impossible for a dialogue to have any more than 6 buttons.
func (p *Player) SendDialogue(d dialogue.Dialogue, e world.Entity) {
	p.session().SendDialogue(d, e)
}

// CloseDialogue closes the player's currently open dialogue, if any. If the dialogue's Submittable implements
// dialogue.Closer, the Close method of the Submittable is called after the client acknowledges the closing
// of the dialogue.
func (p *Player) CloseDialogue() {
	p.session().CloseDialogue()
}

// SendForm sends a form to the player for the client to fill out. Once the client fills it out, the Submit
// method of the form will be called.
// Note that the client may also close the form instead of filling it out, which will result in the form not
// having its Submit method called at all. Forms should never depend on the player actually filling out the
// form.
func (p *Player) SendForm(f form.Form) {
	p.session().SendForm(f)
}

// CloseForm closes any forms that the player currently has open. If the player has no forms open, nothing
// happens.
func (p *Player) CloseForm() {
	p.session().CloseForm()
}

// ShowCoordinates enables the vanilla coordinates for the player.
func (p *Player) ShowCoordinates() {
	p.session().EnableCoordinates(true)
}

// HideCoordinates disables the vanilla coordinates for the player.
func (p *Player) HideCoordinates() {
	p.session().EnableCoordinates(false)
}

// EnableInstantRespawn enables the vanilla instant respawn for the player.
func (p *Player) EnableInstantRespawn() {
	p.session().EnableInstantRespawn(true)
}

// DisableInstantRespawn disables the vanilla instant respawn for the player.
func (p *Player) DisableInstantRespawn() {
	p.session().EnableInstantRespawn(false)
}

// SetNameTag changes the name tag displayed over the player in-game. Changing the name tag does not change
// the player's name in, for example, the player list or the chat.
func (p *Player) SetNameTag(name string) {
	p.nameTag = name
	p.updateState()
}

// NameTag returns the current name tag of the Player as shown in-game. It can be changed using SetNameTag.
func (p *Player) NameTag() string {
	return p.nameTag
}

// SetScoreTag changes the score tag displayed over the player in-game. The score tag is displayed under the player's
// name tag.
func (p *Player) SetScoreTag(a ...any) {
	tag := format(a)
	p.scoreTag = tag
	p.updateState()
}

// ScoreTag returns the current score tag of the player. It can be changed using SetScoreTag and by default is empty.
func (p *Player) ScoreTag() string {
	return p.scoreTag
}

// SetSpeed sets the speed of the player. The value passed is the blocks/tick speed that the player will then
// obtain.
func (p *Player) SetSpeed(speed float64) {
	p.speed = speed
	p.session().SendSpeed(speed)
}

// Speed returns the speed of the player, returning a value that indicates the blocks/tick speed. The default
// speed of a player is 0.1.
func (p *Player) Speed() float64 {
	return p.speed
}

// SetFlightSpeed sets the flight speed of the player. The value passed represents the base speed, which is
// multiplied by 10 to obtain the actual blocks/tick speed that the player will then obtain while flying.
func (p *Player) SetFlightSpeed(flightSpeed float64) {
	p.flightSpeed = flightSpeed
	p.session().SendAbilities(p)
}

// FlightSpeed returns the flight speed of the player, with the value representing the base speed. The actual
// blocks/tick speed is this value multiplied by 10. The default flight speed of a player is 0.05, which
// corresponds to 0.5 blocks/tick.
func (p *Player) FlightSpeed() float64 {
	return p.flightSpeed
}

// SetVerticalFlightSpeed sets the flight speed of the player on the Y axis. The value passed represents the
// base speed, which is the blocks/tick speed that the player will obtain while flying.
func (p *Player) SetVerticalFlightSpeed(flightSpeed float64) {
	p.verticalFlightSpeed = flightSpeed
	p.session().SendAbilities(p)
}

// VerticalFlightSpeed returns the flight speed of the player on the Y axis, with the value representing the
// base speed. The default vertical flight speed of a player is 1.0, which corresponds to 1 block/tick.
func (p *Player) VerticalFlightSpeed() float64 {
	return p.verticalFlightSpeed
}

// Health returns the current health of the player. It will always be lower than Player.MaxHealth().
func (p *Player) Health() float64 {
	return p.health.Health()
}

// MaxHealth returns the maximum amount of health that a player may have. The MaxHealth will always be higher
// than Player.Health().
func (p *Player) MaxHealth() float64 {
	return p.health.MaxHealth()
}

// SetMaxHealth sets the maximum health of the player. If the current health of the player is higher than the
// new maximum health, the health is set to the new maximum.
// SetMaxHealth panics if the max health passed is 0 or lower.
func (p *Player) SetMaxHealth(health float64) {
	p.health.SetMaxHealth(health)
	p.session().SendHealth(p.Health(), p.MaxHealth(), p.absorptionHealth)
}

// addHealth adds health to the player's current health.
func (p *Player) addHealth(health float64) {
	p.health.AddHealth(health)
	p.session().SendHealth(p.Health(), p.MaxHealth(), p.absorptionHealth)
}

// Heal heals the entity for a given amount of health. The source passed
// represents the cause of the healing, for example entity.FoodHealingSource if
// the entity healed by having a full food bar. If the health added to the
// original health exceeds the entity's max health, Heal will not add the full
// amount. If the health passed is negative, Heal will not do anything.
func (p *Player) Heal(health float64, source world.HealingSource) {
	if p.Dead() || health < 0 || !p.GameMode().AllowsTakingDamage() {
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleHeal(ctx, &health, source); ctx.Cancelled() {
		return
	}
	p.addHealth(health)
}

// updateFallState is called to update the entities falling state.
func (p *Player) updateFallState(distanceThisTick float64) {
	switch {
	case p.OnGround():
		if p.fallDistance > 0 {
			p.fall(p.fallDistance)
			p.ResetFallDistance()
		}
	case distanceThisTick < p.fallDistance:
		p.fallDistance -= distanceThisTick
	default:
		p.ResetFallDistance()
	}
}

// fall is called when a falling entity hits the ground.
func (p *Player) fall(distance float64) {
	pos := cube.PosFromVec3(p.Position())
	b := p.tx.Block(pos)

	if len(b.Model().BBox(pos, p.tx)) == 0 {
		pos = pos.Sub(cube.Pos{0, 1})
		b = p.tx.Block(pos)
	}
	if h, ok := b.(block.EntityLander); ok {
		h.EntityLand(pos, p.tx, p, &distance)
	}
	dmg := distance - 3
	if boost, ok := p.Effect(effect.JumpBoost); ok {
		dmg -= float64(boost.Level())
	}
	if dmg < 0.5 {
		return
	}
	p.Hurt(math.Ceil(dmg), entity.FallDamageSource{})
}

// Hurt hurts the player for a given amount of damage. The source passed
// represents the cause of the damage, for example entity.AttackDamageSource if
// the player is attacked by another entity. If the final damage exceeds the
// health that the player currently has, the player is killed and will have to
// respawn.
// If the damage passed is negative, Hurt will not do anything. Hurt returns the
// final damage dealt to the Player and if the Player was vulnerable to this
// kind of damage.
func (p *Player) Hurt(dmg float64, src world.DamageSource) (float64, bool) {
	if _, ok := p.Effect(effect.FireResistance); (ok && src.Fire()) || p.Dead() || !p.GameMode().AllowsTakingDamage() || dmg < 0 {
		return 0, false
	}
	totalDamage := p.FinalDamageFrom(dmg, src)
	damageLeft := totalDamage

	immune := time.Now().Before(p.immuneUntil)
	if immune {
		if damageLeft -= p.lastDamage; damageLeft <= 0 {
			return 0, false
		}
	}

	immunity := time.Second / 2
	ctx := event.C(p)
	if p.Handler().HandleHurt(ctx, &damageLeft, immune, &immunity, src); ctx.Cancelled() {
		return 0, false
	}
	p.setAttackImmunity(immunity, totalDamage)

	if a := p.Absorption(); a > 0 {
		remaining := a - damageLeft
		p.SetAbsorption(remaining)
		damageLeft = max(0, damageLeft-a)
		if _, exists := p.Effect(effect.Absorption); exists && remaining <= 0 {
			p.RemoveEffect(effect.Absorption)
		}
	}

	if p.Health()-damageLeft <= mgl64.Epsilon && !src.IgnoreTotem() {
		hand, offHand := p.HeldItems()
		if _, ok := offHand.Item().(item.Totem); ok {
			p.applyTotemEffects()
			p.SetHeldItems(hand, offHand.Grow(-1))
			return 0, false
		} else if _, ok := hand.Item().(item.Totem); ok {
			p.applyTotemEffects()
			p.SetHeldItems(hand.Grow(-1), offHand)
			return 0, false
		}
	}

	p.addHealth(-damageLeft)

	if src.ReducedByArmour() {
		p.Exhaust(0.1)
		p.Armour().Damage(dmg, p.damageItem)

		var origin world.Entity
		if s, ok := src.(entity.AttackDamageSource); ok {
			origin = s.Attacker
		} else if s, ok := src.(entity.ProjectileDamageSource); ok {
			origin = s.Owner
		}
		if l, ok := origin.(entity.Living); ok {
			if thornsDmg := p.Armour().ThornsDamage(p.damageItem); thornsDmg > 0 {
				l.Hurt(thornsDmg, enchantment.ThornsDamageSource{Owner: p})
			}
		}
	}

	pos := p.Position()
	for _, viewer := range p.viewers() {
		viewer.ViewEntityAction(p, entity.HurtAction{})
	}
	if src.Fire() {
		p.tx.PlaySound(pos, sound.Burning{})
	} else if _, ok := src.(entity.DrowningDamageSource); ok {
		p.tx.PlaySound(pos, sound.Drowning{})
	}

	p.Wake()

	if p.Dead() {
		p.kill(src)
	}
	return totalDamage, true
}

// applyTotemEffects is an unexported function that is used to handle totem effects.
func (p *Player) applyTotemEffects() {
	p.addHealth(2 - p.Health())

	for _, e := range p.Effects() {
		p.RemoveEffect(e.Type())
	}

	p.AddEffect(effect.New(effect.Regeneration, 2, time.Second*40))
	p.AddEffect(effect.New(effect.FireResistance, 1, time.Second*40))
	p.AddEffect(effect.New(effect.Absorption, 2, time.Second*5))

	p.tx.PlaySound(p.Position(), sound.Totem{})

	for _, viewer := range p.viewers() {
		viewer.ViewEntityAction(p, entity.TotemUseAction{})
	}
}

// FinalDamageFrom resolves the final damage received by the player if it is attacked by the source passed
// with the damage passed. FinalDamageFrom takes into account things such as the armour worn and the
// enchantments on the individual pieces.
// The damage returned will be at the least 0.
func (p *Player) FinalDamageFrom(dmg float64, src world.DamageSource) float64 {
	dmg = max(dmg, 0)

	dmg -= p.Armour().DamageReduction(dmg, src)
	if res, ok := p.Effect(effect.Resistance); ok {
		dmg *= effect.Resistance.Multiplier(src, res.Level())
	}
	return dmg
}

// Explode ...
func (p *Player) Explode(explosionPos mgl64.Vec3, impact float64, c block.ExplosionConfig) {
	diff := p.Position().Sub(explosionPos)
	p.Hurt(math.Floor((impact*impact+impact)*3.5*c.Size*2+1), entity.ExplosionDamageSource{})
	p.knockBack(explosionPos, impact, diff[1]/diff.Len()*impact)
}

// SetAbsorption sets the absorption health of a player. This extra health shows as golden hearts and do not
// actually increase the maximum health. Once the hearts are lost, they will not regenerate.
// Nothing happens if a negative number is passed.
func (p *Player) SetAbsorption(health float64) {
	p.absorptionHealth = max(health, 0)
	p.session().SendHealth(p.Health(), p.MaxHealth(), p.absorptionHealth)
}

// Absorption returns the absorption health that the player has.
func (p *Player) Absorption() float64 {
	return p.absorptionHealth
}

// KnockBack knocks the player back with a given force and height. A source is passed which indicates the
// source of the velocity, typically the position of an attacking entity. The source is used to calculate the
// direction which the entity should be knocked back in.
func (p *Player) KnockBack(src mgl64.Vec3, force, height float64) {
	if p.Dead() || !p.GameMode().AllowsTakingDamage() {
		return
	}
	p.knockBack(src, force, height)
}

// knockBack is an unexported function that is used to knock the player back. This function does not check if the player
// can take damage or not.
func (p *Player) knockBack(src mgl64.Vec3, force, height float64) {
	velocity := p.Position().Sub(src)
	velocity[1] = 0

	if velocity.Len() != 0 {
		velocity = velocity.Normalize().Mul(force)
	}
	velocity[1] = height

	p.SetVelocity(velocity.Mul(1 - p.Armour().KnockBackResistance()))
}

// setAttackImmunity sets the duration the player is immune to entity attacks.
func (p *Player) setAttackImmunity(d time.Duration, dmg float64) {
	p.immuneUntil = time.Now().Add(d)
	p.lastDamage = dmg
}

// Food returns the current food level of a player. The level returned is guaranteed to always be between 0
// and 20. Every half drumstick is one level.
func (p *Player) Food() int {
	return p.hunger.Food()
}

// SetFood sets the food level of a player. The level passed must be in a range of 0-20. If the level passed
// is negative, the food level will be set to 0. If the level exceeds 20, the food level will be set to 20.
func (p *Player) SetFood(level int) {
	p.hunger.SetFood(level)
	p.sendFood()
}

// AddFood adds a number of points to the food level of the player. If the new food level is negative or if
// it exceeds 20, it will be set to 0 or 20 respectively.
func (p *Player) AddFood(points int) {
	p.hunger.AddFood(points)
	p.sendFood()
}

// Saturate saturates the player's food bar with the amount of food points and saturation points passed. The
// total saturation of the player will never exceed its total food level.
func (p *Player) Saturate(food int, saturation float64) {
	p.hunger.saturate(food, saturation)
	p.sendFood()
}

// sendFood sends the current food properties to the client.
func (p *Player) sendFood() {
	p.session().SendFood(p.hunger.foodLevel, p.hunger.saturationLevel, p.hunger.exhaustionLevel)
}

// AddEffect adds an entity.Effect to the Player. If the effect is instant, it is applied to the Player
// immediately. If not, the effect is applied to the player every time the Tick method is called.
// AddEffect will overwrite any effects present if the level of the effect is higher than the existing one, or
// if the effects' levels are equal and the new effect has a longer duration.
func (p *Player) AddEffect(e effect.Effect) {
	p.session().SendEffect(p.effects.Add(e, p))
	p.updateState()
}

// RemoveEffect removes any effect that might currently be active on the Player.
func (p *Player) RemoveEffect(e effect.Type) {
	p.effects.Remove(e, p)
	p.session().SendEffectRemoval(e)
	p.updateState()
}

// Effect returns the effect instance and true if the Player has the effect. If not found, it will return an empty
// effect instance and false.
func (p *Player) Effect(e effect.Type) (effect.Effect, bool) {
	return p.effects.Effect(e)
}

// Effects returns any effect currently applied to the entity. The returned effects are guaranteed not to have
// expired when returned.
func (p *Player) Effects() []effect.Effect {
	return p.effects.Effects()
}

// BeaconAffected ...
func (*Player) BeaconAffected() bool {
	return true
}

// Exhaust exhausts the player by the amount of points passed if the player is in survival mode. If the total
// exhaustion level exceeds 4, a saturation point, or food point, if saturation is 0, will be subtracted.
func (p *Player) Exhaust(points float64) {
	if !p.GameMode().AllowsTakingDamage() || p.tx.World().Difficulty().FoodRegenerates() {
		return
	}
	before := p.hunger.Food()
	p.hunger.exhaust(points)
	if after := p.hunger.Food(); before != after {
		// Temporarily set the food level back so that it hasn't yet changed once the event is handled.
		p.hunger.SetFood(before)

		ctx := event.C(p)
		if p.Handler().HandleFoodLoss(ctx, before, &after); ctx.Cancelled() {
			// Reset the exhaustion level if the event was cancelled. Because if
			// we cancel this, and at some point we stop cancelling it, the
			// first food point will be lost more quickly than expected.
			p.hunger.resetExhaustion()
			return
		}
		p.hunger.SetFood(after)
		if before >= 7 && after <= 6 {
			// The client will stop sprinting by itself too, but we force it just to be sure.
			p.StopSprinting()
		}
	}
	p.sendFood()
}

// Dead checks if the player is considered dead. True is returned if the health of the player is equal to or
// lower than 0.
func (p *Player) Dead() bool {
	return p.Health() <= mgl64.Epsilon
}

// DeathPosition returns the last position the player was at when they died. If the player has never died, the third
// return value will be false.
func (p *Player) DeathPosition() (mgl64.Vec3, world.Dimension, bool) {
	if p.deathPos == nil {
		return mgl64.Vec3{}, nil, false
	}
	return *p.deathPos, p.deathDimension, true
}

// kill kills the player, clearing its inventories and resetting it to its base state.
func (p *Player) kill(src world.DamageSource) {
	for _, viewer := range p.viewers() {
		viewer.ViewEntityAction(p, entity.DeathAction{})
	}

	p.addHealth(-p.MaxHealth())

	keepInv := false
	p.Handler().HandleDeath(p, src, &keepInv)
	p.StopSneaking()
	p.StopSprinting()

	pos := p.Position()
	if !keepInv {
		p.dropItems()
	}
	for _, e := range p.Effects() {
		p.RemoveEffect(e.Type())
	}

	p.deathPos, p.deathDimension = &pos, p.tx.World().Dimension()

	// Wait a little before removing the entity. The client displays a death
	// animation while the player is dying.
	time.AfterFunc(time.Millisecond*1100, func() {
		p.H().ExecWorld(finishDying)
	})
}

// finishDying completes the death of a player, removing it from the world.
func finishDying(_ *world.Tx, e world.Entity) {
	p := e.(*Player)
	if p.session() == session.Nop {
		_ = p.Close()
		return
	}
	if p.Dead() {
		p.SetInvisible()
		// We have an actual client connected to this player: We change its
		// position server side so that in the future, the client won't respawn
		// on the death location when disconnecting. The client should not see
		// the movement itself yet, though.
		pos, _, _, _ := p.spawnLocation()

		p.data.Pos = pos.Vec3()
	}
}

// dropItems drops all items and experience of the Player on the ground in random directions.
func (p *Player) dropItems() {
	pos := p.Position()
	for _, orb := range entity.NewExperienceOrbs(pos, int(math.Min(float64(p.experience.Level()*7), 100))) {
		p.tx.AddEntity(orb)
	}
	p.experience.Reset()
	p.session().SendExperience(p.ExperienceLevel(), p.ExperienceProgress())

	p.MoveItemsToInventory()
	for _, it := range append(p.inv.Clear(), append(p.armour.Clear(), p.offHand.Clear()...)...) {
		if _, ok := it.Enchantment(enchantment.CurseOfVanishing); ok {
			continue
		}
		opts := world.EntitySpawnOpts{Position: pos, Velocity: mgl64.Vec3{rand.Float64()*0.2 - 0.1, 0.2, rand.Float64()*0.2 - 0.1}}
		p.tx.AddEntity(entity.NewItem(opts, it))
	}
}

// MoveItemsToInventory moves items kept in 'temporary' slots, such as the
// crafting grid of slots in an enchantment table, to the player's inventory.
// If no space is left for these items, the leftover items are dropped.
func (p *Player) MoveItemsToInventory() {
	for _, i := range p.ui.Clear() {
		if n, err := p.inv.AddItem(i); err != nil {
			// We couldn't add the item to the main inventory (probably because
			// it was full), so we drop it instead.
			p.Drop(i.Grow(i.Count() - n))
		}
	}
}

// Respawn spawns the player after it dies, so that its health is replenished,
// and it is spawned in the world again. Nothing will happen if the player does
// not have a session connected to it.
// Calling Respawn may lead to the player being removed from its world and being
// added to a new world. This means that p cannot be assumed to be valid after
// a call to Respawn.
func (p *Player) Respawn() *world.EntityHandle {
	p.respawn(nil)
	return p.handle
}

func (p *Player) respawn(f func(p *Player)) {
	if !p.Dead() || p.session() == session.Nop {
		return
	}

	blockPos, w, spawnObstructed, _ := p.spawnLocation()
	pos := blockPos.Vec3Middle()

	if spawnObstructed {
		p.Messaget(chat.MessageBedNotValid)
	}

	p.addHealth(p.MaxHealth())
	p.hunger.Reset()
	p.sendFood()
	p.Extinguish()
	p.ResetFallDistance()

	p.Handler().HandleRespawn(p, &pos, &w)

	handle := p.tx.RemoveEntity(p)
	w.Exec(func(tx *world.Tx) {
		np := tx.AddEntity(handle).(*Player)
		np.Teleport(pos)
		np.session().SendRespawn(pos, p)
		np.SetVisible()
		if f != nil {
			f(np)
		}
	})
}

// spawnLocation designates a players safe spawn location.
func (p *Player) spawnLocation() (playerSpawn cube.Pos, w *world.World, spawnBlockBroken bool, previousDimension world.Dimension) {
	tx := p.tx
	w = tx.World()
	previousDimension = w.Dimension()
	playerSpawn = w.PlayerSpawn(p.UUID())
	if b, ok := tx.Block(playerSpawn).(block.Bed); ok && b.CanRespawnOn() {
		pos, ok := b.SafeSpawn(playerSpawn, tx)
		if ok {
			return pos, w, false, previousDimension
		}
	}

	// We can use the principle here that returning through a portal of a specific dimension inside that dimension will
	// always bring us back to the overworld.
	w = w.PortalDestination(w.Dimension())
	worldSpawn := w.Spawn()
	return worldSpawn, w, playerSpawn != worldSpawn, previousDimension
}

// StartSprinting makes a player start sprinting, increasing the speed of the player by 30% and making
// particles show up under the feet. The player will only start sprinting if its food level is high enough.
// If the player is sneaking when calling StartSprinting, it is stopped from sneaking.
func (p *Player) StartSprinting() {
	if !p.hunger.canSprint() && p.GameMode().AllowsTakingDamage() || p.crawling || p.sprinting {
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleToggleSprint(ctx, true); ctx.Cancelled() {
		return
	}
	p.StopSneaking()
	p.sprinting = true
	p.SetSpeed(p.speed * 1.3)
	p.updateState()
}

// Sprinting checks if the player is currently sprinting.
func (p *Player) Sprinting() bool {
	return p.sprinting
}

// StopSprinting makes a player stop sprinting, setting back the speed of the player to its original value.
func (p *Player) StopSprinting() {
	if !p.sprinting {
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleToggleSprint(ctx, false); ctx.Cancelled() {
		return
	}
	p.sprinting = false
	p.SetSpeed(p.speed / 1.3)
	p.updateState()
}

// StartSneaking makes a player start sneaking. If the player is already sneaking, StartSneaking will not do
// anything.
// If the player is sprinting while StartSneaking is called, the sprinting is stopped.
func (p *Player) StartSneaking() {
	if p.sneaking {
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleToggleSneak(ctx, true); ctx.Cancelled() {
		return
	}
	if !p.Flying() {
		p.StopSprinting()
	}
	p.sneaking = true
	p.updateState()
}

// Sneaking checks if the player is currently sneaking.
func (p *Player) Sneaking() bool {
	return p.sneaking
}

// StopSneaking makes a player stop sneaking if it currently is. If the player is not sneaking, StopSneaking
// will not do anything.
func (p *Player) StopSneaking() {
	if !p.sneaking {
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleToggleSneak(ctx, false); ctx.Cancelled() {
		return
	}
	p.sneaking = false
	p.updateState()
}

// StartSwimming makes the player start swimming if it is not currently doing so. If the player is sneaking
// while StartSwimming is called, the sneaking is stopped.
func (p *Player) StartSwimming() {
	if p.swimming {
		return
	}
	p.StopSneaking()
	p.swimming = true
	p.updateState()
}

// Swimming checks if the player is currently swimming.
func (p *Player) Swimming() bool {
	return p.swimming
}

// StopSwimming makes the player stop swimming if it is currently doing so.
func (p *Player) StopSwimming() {
	if !p.swimming {
		return
	}
	p.swimming = false
	p.updateState()
}

// Splash is called when a water bottle splashes onto the player.
func (p *Player) Splash(*world.Tx, mgl64.Vec3) {
	if d := p.OnFireDuration(); d.Seconds() <= 0 {
		return
	}
	p.Extinguish()
}

// StartCrawling makes the player start crawling if it is not currently doing so. If the player is sneaking
// while StartCrawling is called, the sneaking is stopped.
func (p *Player) StartCrawling() {
	if p.crawling {
		return
	}
	for _, corner := range p.H().Type().BBox(p).Translate(p.Position()).Corners() {
		if _, isAir := p.tx.Block(cube.PosFromVec3(corner).Add(cube.Pos{0, 1, 0})).(block.Air); !isAir {
			p.crawling = true
			break
		}
	}
	p.StopSneaking()
	p.updateState()
}

// StopCrawling makes the player stop crawling if it is currently doing so.
func (p *Player) StopCrawling() {
	if !p.crawling {
		return
	}
	p.crawling = false
	p.updateState()
}

// Crawling checks if the player is currently crawling.
func (p *Player) Crawling() bool {
	return p.crawling
}

// StartGliding makes the player start gliding if it is not currently doing so.
func (p *Player) StartGliding() {
	if p.gliding {
		return
	}
	chest := p.Armour().Chestplate()
	if _, ok := chest.Item().(item.Elytra); !ok || chest.Durability() < 2 {
		return
	}
	p.gliding = true
	p.updateState()
}

// Gliding checks if the player is currently gliding.
func (p *Player) Gliding() bool {
	return p.gliding
}

// StopGliding makes the player stop gliding if it is currently doing so.
func (p *Player) StopGliding() {
	if !p.gliding {
		return
	}
	p.gliding = false
	p.glideTicks = 0
	p.updateState()
}

// StartFlying makes the player start flying if they aren't already. It requires the player to be in a gamemode which
// allows flying.
func (p *Player) StartFlying() {
	if !p.GameMode().AllowsFlying() || p.Flying() {
		return
	}
	p.flying = true
	p.session().SendGameMode(p)
}

// Flying checks if the player is currently flying.
func (p *Player) Flying() bool {
	return p.flying
}

// StopFlying makes the player stop flying if it currently is.
func (p *Player) StopFlying() {
	if !p.flying {
		return
	}
	p.flying = false
	p.session().SendGameMode(p)
}

// Jump makes the player jump if they are on ground. It exhausts the player by 0.05 food points, an additional 0.15
// is exhausted if the player is sprint jumping.
func (p *Player) Jump() {
	if p.Dead() {
		return
	}

	p.Handler().HandleJump(p)
	if p.OnGround() {
		jumpVel := 0.42
		if e, ok := p.Effect(effect.JumpBoost); ok {
			jumpVel = float64(e.Level()) / 10
		}
		p.data.Vel = mgl64.Vec3{0, jumpVel}
	}
	if p.Sprinting() {
		p.Exhaust(0.2)
	} else {
		p.Exhaust(0.05)
	}
}

// Sleep makes the player sleep at the given position. If the position does not map to a bed (specifically the head side),
// the player will not sleep.
func (p *Player) Sleep(pos cube.Pos) {
	if p.sleeping {
		// The player is already sleeping.
		return
	}

	tx := p.tx
	b, ok := tx.Block(pos).(block.Bed)
	if !ok || b.Sleeper != nil {
		// The player cannot sleep here.
		return
	}

	ctx, sendReminder := event.C(p), true
	if p.Handler().HandleSleep(ctx, &sendReminder); ctx.Cancelled() {
		return
	}

	b.Sleeper = p.H()
	tx.SetBlock(pos, b, nil)

	tx.World().SetRequiredSleepDuration(time.Millisecond * 5050)

	p.data.Pos = pos.Vec3Middle().Add(mgl64.Vec3{0, 0.5625})
	p.sleeping = true
	p.sleepPos = pos

	p.session().SendPlayerSpawn(pos.Vec3())

	if sendReminder {
		tx.BroadcastSleepingReminder(p)
	}

	tx.BroadcastSleepingIndicator()
	p.updateState()
}

// Wake forces the player out of bed if they are sleeping.
func (p *Player) Wake() {
	if !p.sleeping {
		return
	}
	p.sleeping = false

	tx := p.tx
	tx.BroadcastSleepingIndicator()

	for _, v := range p.viewers() {
		v.ViewEntityWake(p)
	}
	p.updateState()

	pos := p.sleepPos
	if b, ok := tx.Block(pos).(block.Bed); ok {
		b.Sleeper = nil
		tx.SetBlock(pos, b, nil)
	}
}

// Sleeping returns true if the player is currently sleeping, along with the position of the bed the player is sleeping
// on.
func (p *Player) Sleeping() (cube.Pos, bool) {
	if !p.sleeping {
		return cube.Pos{}, false
	}
	return p.sleepPos, true
}

// SendSleepingIndicator displays a notification to the player on the amount of sleeping players in the world.
func (p *Player) SendSleepingIndicator(sleeping, max int) {
	p.session().ViewSleepingPlayers(sleeping, max)
}

// SetInvisible sets the player invisible, so that other players will not be able to see it.
func (p *Player) SetInvisible() {
	if p.Invisible() {
		return
	}
	p.invisible = true
	p.updateState()
}

// SetVisible sets the player visible again, so that other players can see it again. If the player was already
// visible, or if the player is in spectator mode, nothing happens.
func (p *Player) SetVisible() {
	if _, ok := p.Effect(effect.Invisibility); ok || !p.GameMode().Visible() || !p.invisible {
		return
	}
	p.invisible = false
	p.updateState()
}

// Invisible checks if the Player is currently invisible.
func (p *Player) Invisible() bool {
	return p.invisible
}

// SetImmobile prevents the player from moving around, but still allows them to look around.
func (p *Player) SetImmobile() {
	if p.Immobile() {
		return
	}
	p.immobile = true
	p.updateState()
}

// SetMobile allows the player to freely move around again after being immobile.
func (p *Player) SetMobile() {
	if !p.Immobile() {
		return
	}
	p.immobile = false
	p.updateState()
}

// Immobile checks if the Player is currently immobile.
func (p *Player) Immobile() bool {
	return p.immobile
}

// FireProof checks if the Player is currently fireproof. True is returned if the player has a fireResistance effect or
// if it is in creative mode.
func (p *Player) FireProof() bool {
	if _, ok := p.Effect(effect.FireResistance); ok {
		return true
	}
	return !p.GameMode().AllowsTakingDamage()
}

// OnFireDuration ...
func (p *Player) OnFireDuration() time.Duration {
	return time.Duration(p.fireTicks) * time.Second / 20
}

// SetOnFire ...
func (p *Player) SetOnFire(duration time.Duration) {
	ticks := int64(duration.Seconds() * 20)
	if level := p.Armour().HighestEnchantmentLevel(enchantment.FireProtection); level > 0 {
		ticks -= int64(math.Floor(float64(ticks) * float64(level) * 0.15))
	}
	p.fireTicks = ticks
	p.updateState()
}

// Extinguish ...
func (p *Player) Extinguish() {
	p.SetOnFire(0)
}

// Inventory returns the inventory of the player. This inventory holds the items stored in the normal part of
// the inventory and the hotbar. It also includes the item in the main hand as returned by Player.HeldItems().
func (p *Player) Inventory() *inventory.Inventory {
	return p.inv
}

// Armour returns the armour inventory of the player. This inventory yields 4 slots, for the helmet,
// chestplate, leggings and boots respectively.
func (p *Player) Armour() *inventory.Armour {
	return p.armour
}

// HeldItems returns the items currently held in the hands of the player. The first item stack returned is the
// one held in the main hand, the second is held in the off-hand.
// If no item was held in a hand, the stack returned has a count of 0. Stack.Empty() may be used to check if
// the hand held anything.
func (p *Player) HeldItems() (mainHand, offHand item.Stack) {
	offHand, _ = p.offHand.Item(0)
	mainHand, _ = p.inv.Item(int(*p.heldSlot))
	return mainHand, offHand
}

// SetHeldItems sets items to the main hand and the off-hand of the player. The Stacks passed may be empty
// (Stack.Empty()) to clear the held item.
func (p *Player) SetHeldItems(mainHand, offHand item.Stack) {
	_ = p.inv.SetItem(int(*p.heldSlot), mainHand)
	_ = p.offHand.SetItem(0, offHand)
}

// SetHeldSlot updates the held slot of the player to the slot provided. The
// slot must be between 0 and 8.
func (p *Player) SetHeldSlot(to int) error {
	// The slot that the player might have selected must be within the hotbar:
	// The held item cannot be in a different place in the inventory.
	if to < 0 || to > 8 {
		return fmt.Errorf("held slot exceeds hotbar range 0-8: slot is %v", to)
	}
	from := int(*p.heldSlot)
	if from == to {
		// Old slot was the same as new slot, so don't do anything.
		return nil
	}

	ctx := event.C(p)
	p.Handler().HandleHeldSlotChange(ctx, from, to)
	if ctx.Cancelled() {
		// The slot change was cancelled, resend held slot.
		p.session().SendHeldSlot(from, p, true)
		return nil
	}
	*p.heldSlot = uint32(to)
	p.usingItem = false

	for _, viewer := range p.viewers() {
		viewer.ViewEntityItems(p)
	}
	p.session().SendHeldSlot(to, p, false)
	return nil
}

// EnderChestInventory returns the player's ender chest inventory. Its accessed by the player when opening
// ender chests anywhere.
func (p *Player) EnderChestInventory() *inventory.Inventory {
	return p.enderChest
}

// SetGameMode sets the game mode of a player. The game mode specifies the way that the player can interact
// with the world that it is in.
func (p *Player) SetGameMode(mode world.GameMode) {
	previous := p.GameMode()
	p.gameMode = mode

	if !mode.AllowsFlying() {
		p.StopFlying()
	}
	if !mode.Visible() {
		p.SetInvisible()
	} else if !previous.Visible() {
		p.SetVisible()
	}

	p.session().SendGameMode(p)
	for _, v := range p.viewers() {
		v.ViewEntityGameMode(p)
	}
	if mode.AllowsTakingDamage() {
		p.session().SendHealth(p.Health(), p.MaxHealth(), p.absorptionHealth)
	}
}

// GameMode returns the current game mode assigned to the player. If not changed, the game mode returned will
// be the same as that of the world that the player spawns in.
// The game mode may be changed using Player.SetGameMode().
func (p *Player) GameMode() world.GameMode {
	return p.gameMode
}

// HasCooldown returns true if the item passed has an active cooldown, meaning it currently cannot be used again. If the
// world.Item passed is nil, HasCooldown always returns false.
func (p *Player) HasCooldown(item world.Item) bool {
	if item == nil {
		return false
	}
	name, _ := item.EncodeItem()
	otherTime, ok := p.cooldowns[name]
	if !ok {
		return false
	}
	if time.Now().After(otherTime) {
		delete(p.cooldowns, name)
		return false
	}
	return true
}

// SetCooldown sets a cooldown for an item. If the world.Item passed is nil, nothing happens.
func (p *Player) SetCooldown(item world.Item, cooldown time.Duration) {
	if item == nil {
		return
	}
	name, _ := item.EncodeItem()
	p.cooldowns[name] = time.Now().Add(cooldown)
	p.session().ViewItemCooldown(item, cooldown)
}

// UseItem uses the item currently held in the player's main hand in the air. Generally, nothing happens,
// unless the held item implements the item.Usable interface, in which case it will be activated.
// This generally happens for items such as throwable items like snowballs.
func (p *Player) UseItem() {
	i, _ := p.HeldItems()
	ctx := event.C(p)
	if p.HasCooldown(i.Item()) {
		return
	}
	if p.Handler().HandleItemUse(ctx); ctx.Cancelled() {
		return
	}
	i, left := p.HeldItems()
	it := i.Item()

	if cd, ok := it.(item.Cooldown); ok {
		p.SetCooldown(it, cd.Cooldown())
	}

	if _, ok := it.(item.Releasable); ok {
		if !p.canRelease() {
			return
		}
		p.usingSince, p.usingItem = time.Now(), true
		p.updateState()
	}
	switch usable := it.(type) {
	case item.Chargeable:
		useCtx := p.useContext()
		if !p.usingItem {
			if !usable.ReleaseCharge(p, p.tx, useCtx) && usable.CanCharge(p, p.tx, useCtx) {
				// If the item was not charged yet, start charging.
				p.usingSince, p.usingItem = time.Now(), true
			}
			p.handleUseContext(useCtx)
			p.updateState()
			return
		}

		// Stop charging and determine if the item is ready.
		p.usingItem = false
		dur := p.useDuration()
		if usable.Charge(p, p.tx, useCtx, dur) {
			p.session().SendChargeItemComplete()
		}
		p.handleUseContext(useCtx)
		p.updateState()
	case item.Usable:
		useCtx := p.useContext()
		if !usable.Use(p.tx, p, useCtx) {
			return
		}
		// We only swing the player's arm if the item held actually does something. If it doesn't, there is no
		// reason to swing the arm.
		p.SwingArm()
		p.SetHeldItems(p.subtractItem(p.damageItem(i, useCtx.Damage), useCtx.CountSub), left)
		p.addNewItem(useCtx)
	case item.Consumable:
		if c, ok := usable.(interface{ CanConsume() bool }); ok && !c.CanConsume() {
			p.ReleaseItem()
			return
		}
		if !usable.AlwaysConsumable() && p.GameMode().AllowsTakingDamage() && p.Food() >= 20 {
			// The item.Consumable is not always consumable, the player is not in creative mode and the
			// food bar is filled: The item cannot be consumed.
			p.ReleaseItem()
			return
		}
		if !p.usingItem {
			// Consumable starts being consumed: Set the start timestamp and update the using state to viewers.
			p.usingItem, p.usingSince = true, time.Now()
			p.updateState()
			return
		}
		// The player is currently using the item held. This is a signal the item was consumed, so we
		// consume it and start using it again.
		useCtx, dur := p.useContext(), p.useDuration()
		if dur < usable.ConsumeDuration() {
			// The required duration for consuming this item was not met, so we don't consume it.
			return
		}
		// Reset the duration for the next item to be consumed.
		p.usingSince = time.Now()
		ctx := event.C(p)
		if p.Handler().HandleItemConsume(ctx, i); ctx.Cancelled() {
			return
		}
		useCtx.CountSub, useCtx.NewItem = 1, usable.Consume(p.tx, p)
		p.handleUseContext(useCtx)
		p.tx.PlaySound(p.Position().Add(mgl64.Vec3{0, 1.5}), sound.Burp{})
	}
}

// ReleaseItem makes the Player release the item it is currently using. This is only applicable for items that
// implement the item.Releasable interface.
// If the Player is not currently using any item, ReleaseItem returns immediately.
// ReleaseItem either aborts the using of the item or finished it, depending on the time that elapsed since
// the item started being used.
func (p *Player) ReleaseItem() {
	if !p.usingItem || !p.canRelease() || !p.GameMode().AllowsInteraction() {
		p.usingItem = false
		return
	}
	p.usingItem = false

	useCtx, dur := p.useContext(), p.useDuration()
	i, _ := p.HeldItems()
	ctx := event.C(p)
	if p.Handler().HandleItemRelease(ctx, i, dur); ctx.Cancelled() {
		return
	}
	i.Item().(item.Releasable).Release(p, p.tx, useCtx, dur)
	p.handleUseContext(useCtx)
	p.updateState()
}

// canRelease returns whether the player can release the item currently held in the main hand.
func (p *Player) canRelease() bool {
	held, left := p.HeldItems()
	releasable, ok := held.Item().(item.Releasable)
	if !ok {
		return false
	}
	if p.GameMode().CreativeInventory() {
		return true
	}
	for _, req := range releasable.Requirements() {
		reqName, _ := req.Item().EncodeItem()

		if !left.Empty() {
			leftName, _ := left.Item().EncodeItem()
			if leftName == reqName {
				continue
			}
		}

		_, found := p.Inventory().FirstFunc(func(stack item.Stack) bool {
			name, _ := stack.Item().EncodeItem()
			return name == reqName
		})
		if !found {
			return false
		}
	}
	return true
}

// handleUseContext handles the item.UseContext after the item has been used.
func (p *Player) handleUseContext(ctx *item.UseContext) {
	i, left := p.HeldItems()

	p.SetHeldItems(p.subtractItem(p.damageItem(i, ctx.Damage), ctx.CountSub), left)
	p.addNewItem(ctx)
	for _, it := range ctx.ConsumedItems {
		_, offHand := p.HeldItems()
		if offHand.Comparable(it) {
			if err := p.offHand.RemoveItem(it); err == nil {
				continue
			}

			it = it.Grow(-offHand.Count())
		}

		_ = p.Inventory().RemoveItem(it)
	}
}

// useDuration returns the duration the player has been using the item in the main hand.
func (p *Player) useDuration() time.Duration {
	return time.Since(p.usingSince) + time.Second/20
}

// UsingItem checks if the Player is currently using an item. True is returned if the Player is currently eating an
// item or using it over a longer duration such as when using a bow.
func (p *Player) UsingItem() bool {
	return p.usingItem
}

// UseItemOnBlock uses the item held in the main hand of the player on a block at the position passed. The
// player is assumed to have clicked the face passed with the relative click position clickPos.
// If the item could not be used successfully, for example when the position is out of range, the method
// returns immediately.
// UseItemOnBlock does nothing if the block at the cube.Pos passed is of the type block.Air.
func (p *Player) UseItemOnBlock(pos cube.Pos, face cube.Face, clickPos mgl64.Vec3) {
	if _, ok := p.tx.Block(pos).(block.Air); ok || !p.canReach(pos.Vec3Centre()) {
		// The client used its item on a block that does not exist server-side or one it couldn't reach. Stop trying
		// to use the item immediately.
		p.resendNearbyBlocks(pos, face)
		return
	}
	ctx := event.C(p)
	if p.Handler().HandleItemUseOnBlock(ctx, pos, face, clickPos); ctx.Cancelled() {
		p.resendNearbyBlocks(pos, face)
		return
	}
	i, left := p.HeldItems()
	b := p.tx.Block(pos)
	if act, ok := b.(block.Activatable); ok {
		// If a player is sneaking, it will not activate the block clicked, unless it is not holding any
		// items, in which case the block will be activated as usual.
		if !p.Sneaking() || i.Empty() {
			p.SwingArm()

			// The block was activated: Blocks such as doors must always have precedence over the item being
			// used.
			if useCtx := p.useContext(); act.Activate(pos, face, p.tx, p, useCtx) {
				p.SetHeldItems(p.subtractItem(p.damageItem(i, useCtx.Damage), useCtx.CountSub), left)
				p.addNewItem(useCtx)
				return
			}
		}
	}
	if i.Empty() {
		return
	}
	switch ib := i.Item().(type) {
	case item.UsableOnBlock:
		// The item does something when used on a block.
		useCtx := p.useContext()
		if !ib.UseOnBlock(pos, face, clickPos, p.tx, p, useCtx) {
			return
		}
		p.SwingArm()
		p.SetHeldItems(p.subtractItem(p.damageItem(i, useCtx.Damage), useCtx.CountSub), left)
		p.addNewItem(useCtx)
	case world.Block:
		// The item IS a block, meaning it is being placed.
		replacedPos := pos
		if replaceable, ok := b.(block.Replaceable); !ok || !replaceable.ReplaceableBy(ib) {
			// The block clicked was either not replaceable, or not replaceable using the block passed.
			replacedPos = pos.Side(face)
		}
		if replaceable, ok := p.tx.Block(replacedPos).(block.Replaceable); !ok || !replaceable.ReplaceableBy(ib) || replacedPos.OutOfBounds(p.tx.Range()) {
			return
		}
		if !p.placeBlock(replacedPos, ib, false) || p.GameMode().CreativeInventory() {
			return
		}
		p.SetHeldItems(p.subtractItem(i, 1), left)
	}
}

// UseItemOnEntity uses the item held in the main hand of the player on the entity passed, provided it is
// within range of the player.
// If the item held in the main hand of the player does nothing when used on an entity, nothing will happen.
func (p *Player) UseItemOnEntity(e world.Entity) bool {
	if !p.canReach(e.Position()) {
		return false
	}
	ctx := event.C(p)
	if p.Handler().HandleItemUseOnEntity(ctx, e); ctx.Cancelled() {
		return false
	}
	i, left := p.HeldItems()
	usable, ok := i.Item().(item.UsableOnEntity)
	if !ok {
		return true
	}
	useCtx := p.useContext()
	if !usable.UseOnEntity(e, p.tx, p, useCtx) {
		return true
	}
	p.SwingArm()
	p.SetHeldItems(p.subtractItem(p.damageItem(i, useCtx.Damage), useCtx.CountSub), left)
	p.addNewItem(useCtx)
	return true
}

// AttackEntity uses the item held in the main hand of the player to attack the entity passed, provided it is
// within range of the player.
// The damage dealt to the entity will depend on the item held by the player and any effects the player may
// have.
// If the player cannot reach the entity at its position, the method returns immediately.
func (p *Player) AttackEntity(e world.Entity) bool {
	if !p.canReach(e.Position()) {
		return false
	}

	living, isLiving := e.(entity.Living)
	if isLiving && living.Dead() {
		return false
	}

	var (
		force, height  = 0.45, 0.3608
		_, slowFalling = p.Effect(effect.SlowFalling)
		_, blind       = p.Effect(effect.Blindness)
		critical       = !p.Sprinting() && !p.Flying() && p.FallDistance() > 0 && !slowFalling && !blind
	)

	i, _ := p.HeldItems()
	if k, ok := i.Enchantment(enchantment.Knockback); ok {
		inc := enchantment.Knockback.Force(k.Level())
		force += inc
		height += inc
	}

	ctx := event.C(p)
	if p.Handler().HandleAttackEntity(ctx, e, &force, &height, &critical); ctx.Cancelled() {
		return false
	}
	p.SwingArm()

	if !isLiving {
		return false
	}

	dmg := i.AttackDamage()
	if strength, ok := p.Effect(effect.Strength); ok {
		dmg += dmg * effect.Strength.Multiplier(strength.Level())
	}
	if weakness, ok := p.Effect(effect.Weakness); ok {
		dmg -= dmg * effect.Weakness.Multiplier(weakness.Level())
	}
	if s, ok := i.Enchantment(enchantment.Sharpness); ok {
		dmg += enchantment.Sharpness.Addend(s.Level())
		for _, v := range p.tx.Viewers(living.Position()) {
			v.ViewEntityAction(living, entity.EnchantedHitAction{})
		}
	}
	if critical {
		dmg *= 1.5
	}

	n, vulnerable := living.Hurt(dmg, entity.AttackDamageSource{Attacker: p})
	i, left := p.HeldItems()

	if durable, ok := i.Item().(item.Durable); ok {
		p.SetHeldItems(p.damageItem(i, durable.DurabilityInfo().AttackDurability), left)
	}

	p.tx.PlaySound(entity.EyePosition(e), sound.Attack{Damage: !mgl64.FloatEqual(n, 0)})
	if !vulnerable {
		return true
	}
	if critical {
		for _, v := range p.tx.Viewers(living.Position()) {
			v.ViewEntityAction(living, entity.CriticalHitAction{})
		}
	}

	p.Exhaust(0.1)

	living.KnockBack(p.Position(), force, height)

	if f, ok := i.Enchantment(enchantment.FireAspect); ok {
		if flammable, ok := living.(entity.Flammable); ok {
			flammable.SetOnFire(enchantment.FireAspect.Duration(f.Level()))
		}
	}
	return true
}

// StartBreaking makes the player start breaking the block at the position passed using the item currently
// held in its main hand.
// If no block is present at the position, or if the block is out of range, StartBreaking will return
// immediately and the block will not be broken. StartBreaking will stop the breaking of any block that the
// player might be breaking before this method is called.
func (p *Player) StartBreaking(pos cube.Pos, face cube.Face) {
	p.AbortBreaking()
	if _, air := p.tx.Block(pos).(block.Air); air || !p.canReach(pos.Vec3Centre()) {
		// The block was either out of range or air, so it can't be broken by the player.
		return
	}
	if _, ok := p.tx.Block(pos.Side(face)).(block.Fire); ok {
		ctx := event.C(p)
		if p.Handler().HandleFireExtinguish(ctx, pos); ctx.Cancelled() {
			// Resend the block because on client side that was extinguished
			p.resendNearbyBlocks(pos, face)
			return
		}

		p.tx.SetBlock(pos.Side(face), nil, nil)
		p.tx.PlaySound(pos.Vec3(), sound.FireExtinguish{})
		return
	}

	held, _ := p.HeldItems()
	if _, ok := held.Item().(item.Sword); ok && p.GameMode().CreativeInventory() {
		// Can't break blocks with a sword in creative mode.
		return
	}
	// Note: We intentionally store this regardless of whether the breaking proceeds, so that we
	// can resend the block to the client when it tries to break the block regardless.
	p.breakingPos = pos

	ctx := event.C(p)
	if p.Handler().HandleStartBreak(ctx, pos); ctx.Cancelled() {
		return
	}
	if punchable, ok := p.tx.Block(pos).(block.Punchable); ok {
		punchable.Punch(pos, face, p.tx, p)
	}

	p.breaking, p.breakingFace = true, face
	p.SwingArm()

	if p.GameMode().CreativeInventory() {
		return
	}
	p.lastBreakDuration = p.breakTime(pos)
	for _, viewer := range p.viewers() {
		viewer.ViewBlockAction(pos, block.StartCrackAction{BreakTime: p.lastBreakDuration})
	}
}

// breakTime returns the time needed to break a block at the position passed, taking into account the item
// held, if the player is on the ground/underwater and if the player has any effects.
func (p *Player) breakTime(pos cube.Pos) time.Duration {
	held, _ := p.HeldItems()
	breakTime := block.BreakDuration(p.tx.Block(pos), held)
	if !p.OnGround() {
		breakTime *= 5
	}
	if _, ok := p.Armour().Helmet().Enchantment(enchantment.AquaAffinity); p.insideOfWater() && !ok {
		breakTime *= 5
	}
	for _, e := range p.Effects() {
		lvl := e.Level()
		switch e.Type() {
		case effect.Haste:
			breakTime = time.Duration(float64(breakTime) * effect.Haste.Multiplier(lvl))
		case effect.MiningFatigue:
			breakTime = time.Duration(float64(breakTime) * effect.MiningFatigue.Multiplier(lvl))
		case effect.ConduitPower:
			breakTime = time.Duration(float64(breakTime) * effect.ConduitPower.Multiplier(lvl))
		}
	}
	return breakTime
}

// FinishBreaking makes the player finish breaking the block it is currently breaking, or returns immediately
// if the player isn't breaking anything.
// FinishBreaking will stop the animation and break the block.
func (p *Player) FinishBreaking() {
	if !p.breaking {
		p.resendNearbyBlock(p.breakingPos)
		return
	}
	p.AbortBreaking()
	p.BreakBlock(p.breakingPos)
}

// AbortBreaking makes the player stop breaking the block it is currently breaking, or returns immediately
// if the player isn't breaking anything.
// Unlike FinishBreaking, AbortBreaking does not stop the animation.
func (p *Player) AbortBreaking() {
	if !p.breaking {
		return
	}
	p.breaking, p.breakCounter = false, 0
	for _, viewer := range p.viewers() {
		viewer.ViewBlockAction(p.breakingPos, block.StopCrackAction{})
	}
}

// ContinueBreaking makes the player continue breaking the block it started breaking after a call to
// Player.StartBreaking().
// The face passed is used to display particles on the side of the block broken.
func (p *Player) ContinueBreaking(face cube.Face) {
	if !p.breaking {
		return
	}
	pos := p.breakingPos
	b := p.tx.Block(pos)
	p.tx.AddParticle(pos.Vec3(), particle.PunchBlock{Block: b, Face: face})

	if p.breakCounter++; p.breakCounter%5 == 0 {
		p.SwingArm()

		// We send this sound only every so often. Vanilla doesn't send it every tick while breaking
		// either. Every 5 ticks seems accurate.
		p.tx.PlaySound(pos.Vec3(), sound.BlockBreaking{Block: b})
	}
	if breakTime := p.breakTime(pos); breakTime != p.lastBreakDuration {
		for _, viewer := range p.viewers() {
			viewer.ViewBlockAction(pos, block.ContinueCrackAction{BreakTime: breakTime})
		}
		p.lastBreakDuration = breakTime
	}
}

// PlaceBlock makes the player place the block passed at the position passed, granted it is within the range
// of the player.
// An item.UseContext may be passed to obtain information on if the block placement was successful. (SubCount will
// be incremented). Nil may also be passed for the context parameter.
func (p *Player) PlaceBlock(pos cube.Pos, b world.Block, ctx *item.UseContext) {
	ignoreBBox := ctx != nil && ctx.IgnoreBBox
	if !p.placeBlock(pos, b, ignoreBBox) {
		return
	}
	if ctx != nil {
		ctx.CountSub++
	}
}

// placeBlock makes the player place the block passed at the position passed, granted it is within the range
// of the player. A bool is returned indicating if a block was placed successfully.
func (p *Player) placeBlock(pos cube.Pos, b world.Block, ignoreBBox bool) bool {
	if !p.canReach(pos.Vec3Centre()) || !p.GameMode().AllowsEditing() {
		p.resendNearbyBlocks(pos, cube.Faces()...)
		return false
	}
	if obstructed, selfOnly := p.obstructedPos(pos, b); obstructed && !ignoreBBox {
		if !selfOnly {
			// Only resend blocks if there were other entities blocking the
			// placement than the player itself. Resending blocks placed inside
			// the player itself leads to synchronisation issues.
			p.resendNearbyBlocks(pos, cube.Faces()...)
		}
		return false
	}

	ctx := event.C(p)
	if p.Handler().HandleBlockPlace(ctx, pos, b); ctx.Cancelled() {
		p.resendNearbyBlocks(pos, cube.Faces()...)
		return false
	}
	p.tx.SetBlock(pos, b, nil)
	p.tx.PlaySound(pos.Vec3(), sound.BlockPlace{Block: b})
	p.SwingArm()
	return true
}

// obstructedPos checks if the position passed is obstructed if the block
// passed is attempted to be placed. The function returns true as the first
// bool if there is an entity in the way that could prevent the block from
// being placed.
// If the only entity preventing the block from being placed is the player
// itself, the second bool returned is true too.
func (p *Player) obstructedPos(pos cube.Pos, b world.Block) (obstructed, selfOnly bool) {
	blockBoxes := b.Model().BBox(pos, p.tx)
	for i, box := range blockBoxes {
		blockBoxes[i] = box.Translate(pos.Vec3())
	}

	for e := range p.tx.EntitiesWithin(cube.Box(-3, -3, -3, 3, 3, 3).Translate(pos.Vec3())) {
		t := e.H().Type()
		switch t {
		case entity.ItemType, entity.ArrowType, entity.ExperienceOrbType:
			continue
		default:
			if cube.AnyIntersections(blockBoxes, t.BBox(e).Translate(e.Position()).Grow(-1e-4)) {
				obstructed = true
				if e.H() == p.handle {
					continue
				}
				return true, false
			}
		}
	}
	return obstructed, true
}

// BreakBlock makes the player break a block in the world at a position passed. If the player is unable to
// reach the block passed, the method returns immediately.
func (p *Player) BreakBlock(pos cube.Pos) {
	b := p.tx.Block(pos)
	if _, air := b.(block.Air); air {
		// Don't do anything if the position broken is already air.
		return
	}
	if !p.canReach(pos.Vec3Centre()) || !p.GameMode().AllowsEditing() {
		p.resendNearbyBlocks(pos)
		return
	}
	if _, breakable := b.(block.Breakable); !breakable && !p.GameMode().CreativeInventory() {
		p.resendNearbyBlocks(pos)
		return
	}
	held, _ := p.HeldItems()
	drops := p.drops(held, b)

	xp := 0
	if breakable, ok := b.(block.Breakable); ok && !p.GameMode().CreativeInventory() {
		if _, hasSilkTouch := held.Enchantment(enchantment.SilkTouch); !hasSilkTouch {
			xp = breakable.BreakInfo().XPDrops.RandomValue()
		}
	}

	ctx := event.C(p)
	if p.Handler().HandleBlockBreak(ctx, pos, &drops, &xp); ctx.Cancelled() {
		p.resendNearbyBlocks(pos)
		return
	}
	held, left := p.HeldItems()

	p.SwingArm()
	p.tx.SetBlock(pos, nil, nil)
	p.tx.AddParticle(pos.Vec3Centre(), particle.BlockBreak{Block: b})

	if breakable, ok := b.(block.Breakable); ok {
		info := breakable.BreakInfo()
		if info.BreakHandler != nil {
			info.BreakHandler(pos, p.tx, p)
		}
		for _, orb := range entity.NewExperienceOrbs(pos.Vec3Centre(), xp) {
			p.tx.AddEntity(orb)
		}
	}
	for _, drop := range drops {
		opts := world.EntitySpawnOpts{Position: pos.Vec3Centre(), Velocity: mgl64.Vec3{rand.Float64()*0.2 - 0.1, 0.2, rand.Float64()*0.2 - 0.1}}
		p.tx.AddEntity(entity.NewItem(opts, drop))
	}

	p.Exhaust(0.005)
	if block.BreaksInstantly(b, held) {
		return
	}
	if durable, ok := held.Item().(item.Durable); ok {
		p.SetHeldItems(p.damageItem(held, durable.DurabilityInfo().BreakDurability), left)
	}
}

// drops returns the drops that the player can get from the block passed using the item held.
func (p *Player) drops(held item.Stack, b world.Block) []item.Stack {
	t, ok := held.Item().(item.Tool)
	if !ok {
		t = item.ToolNone{}
	}
	var drops []item.Stack
	if breakable, ok := b.(block.Breakable); ok && !p.GameMode().CreativeInventory() {
		if breakable.BreakInfo().Harvestable(t) {
			drops = breakable.BreakInfo().Drops(t, held.Enchantments())
		}
	} else if it, ok := b.(world.Item); ok && !p.GameMode().CreativeInventory() {
		drops = []item.Stack{item.NewStack(it, 1)}
	}
	return drops
}

// PickBlock makes the player pick a block in the world at a position passed. If the player is unable to
// pick the block, the method returns immediately.
func (p *Player) PickBlock(pos cube.Pos) {
	if !p.canReach(pos.Vec3()) {
		return
	}

	b := p.tx.Block(pos)

	var pickedItem item.Stack
	if pi, ok := b.(block.Pickable); ok {
		pickedItem = pi.Pick()
	} else if i, ok := b.(world.Item); ok {
		it, _ := world.ItemByName(i.EncodeItem())
		pickedItem = item.NewStack(it, 1)
	} else {
		return
	}

	slot, found := p.Inventory().First(pickedItem)
	if !found && !p.GameMode().CreativeInventory() {
		return
	}

	ctx := event.C(p)
	if p.Handler().HandleBlockPick(ctx, pos, b); ctx.Cancelled() {
		return
	}
	_, offhand := p.HeldItems()

	if found {
		if slot < 9 {
			_ = p.SetHeldSlot(slot)
			return
		}
		_ = p.Inventory().Swap(slot, int(*p.heldSlot))
		return
	}

	firstEmpty, emptyFound := p.Inventory().FirstEmpty()
	if !emptyFound {
		p.SetHeldItems(pickedItem, offhand)
		return
	}
	if firstEmpty < 9 {
		_ = p.SetHeldSlot(firstEmpty)
		_ = p.Inventory().SetItem(firstEmpty, pickedItem)
		return
	}
	_ = p.Inventory().Swap(firstEmpty, int(*p.heldSlot))
	p.SetHeldItems(pickedItem, offhand)
}

// Teleport teleports the player to a target position in the world. Unlike Move, it immediately changes the
// position of the player, rather than showing an animation.
func (p *Player) Teleport(pos mgl64.Vec3) {
	ctx := event.C(p)
	if p.Handler().HandleTeleport(ctx, pos); ctx.Cancelled() {
		return
	}
	p.Wake()
	p.teleport(pos)
}

// teleport teleports the player to a target position in the world. It does not call the Handler of the
// player.
func (p *Player) teleport(pos mgl64.Vec3) {
	for _, v := range p.viewers() {
		v.ViewEntityTeleport(p, pos)
	}
	p.data.Pos = pos
	p.data.Vel = mgl64.Vec3{}
	p.ResetFallDistance()
}

// Move moves the player from one position to another in the world, by adding the delta passed to the current
// position of the player.
// Move also rotates the player, adding deltaYaw and deltaPitch to the respective values.
func (p *Player) Move(deltaPos mgl64.Vec3, deltaYaw, deltaPitch float64) {
	if p.Dead() || (deltaPos.ApproxEqual(mgl64.Vec3{}) && mgl64.FloatEqual(deltaYaw, 0) && mgl64.FloatEqual(deltaPitch, 0)) {
		return
	}
	if p.immobile {
		if mgl64.FloatEqual(deltaYaw, 0) && mgl64.FloatEqual(deltaPitch, 0) {
			// If only the position was changed, don't continue with the movement when immobile.
			return
		}
		// Still update rotation if it was changed.
		deltaPos = mgl64.Vec3{}
	}
	var (
		pos         = p.Position()
		res, resRot = pos.Add(deltaPos), p.Rotation().Add(cube.Rotation{deltaYaw, deltaPitch})
	)
	ctx := event.C(p)
	if p.Handler().HandleMove(ctx, res, resRot); ctx.Cancelled() {
		if p.session() != session.Nop && pos.ApproxEqual(p.Position()) {
			// The position of the player was changed and the event cancelled. This means we still need to notify the
			// player of this movement change.
			p.teleport(pos)
		}
		return
	}
	for _, v := range p.viewers() {
		v.ViewEntityMovement(p, res, resRot, p.OnGround())
	}

	p.data.Pos = res
	p.data.Rot = resRot
	if deltaPos.Len() <= 3 {
		// Only update velocity if the player is not moving too fast to prevent potential OOMs.
		p.data.Vel = deltaPos
		p.checkBlockCollisions(deltaPos)
	}

	horizontalVel := deltaPos
	horizontalVel[1] = 0
	if p.Gliding() {
		if deltaPos.Y() >= -0.5 {
			p.fallDistance = 1.0
		}
		if p.collidedHorizontally {
			if force := horizontalVel.Len()*10.0 - 3.0; force > 0.0 {
				p.tx.PlaySound(p.Position(), sound.Fall{Distance: force})
				p.Hurt(force, entity.GlideDamageSource{})
			}
		}
	}

	_, submergedBefore := p.tx.Liquid(cube.PosFromVec3(pos.Add(mgl64.Vec3{0, p.EyeHeight()})))
	_, submergedAfter := p.tx.Liquid(cube.PosFromVec3(res.Add(mgl64.Vec3{0, p.EyeHeight()})))
	if submergedBefore != submergedAfter {
		// Player wasn't either breathing before and no longer isn't, or wasn't breathing before and now is,
		// so send the updated metadata.
		p.session().ViewEntityState(p)
	}

	p.onGround = p.checkOnGround(deltaPos)
	p.updateFallState(deltaPos[1])

	if p.Swimming() {
		p.Exhaust(0.01 * horizontalVel.Len())
	} else if p.Sprinting() {
		p.Exhaust(0.1 * horizontalVel.Len())
	}
}

// Position returns the current position of the player. It may be changed as the player moves or is moved
// around the world.
func (p *Player) Position() mgl64.Vec3 {
	return p.data.Pos
}

// Velocity returns the players current velocity. If there is an attached session, this will be empty.
func (p *Player) Velocity() mgl64.Vec3 {
	return p.data.Vel
}

// SetVelocity updates the player's velocity. If there is an attached session, this will just send
// the velocity to the player session for the player to update.
func (p *Player) SetVelocity(velocity mgl64.Vec3) {
	if p.session() == session.Nop {
		p.data.Vel = velocity
		return
	}
	for _, v := range p.viewers() {
		v.ViewEntityVelocity(p, velocity)
	}
}

// Rotation returns the yaw and pitch of the player in degrees. Yaw is horizontal rotation (rotation around the
// vertical axis, 0 when facing forward), pitch is vertical rotation (rotation around the horizontal axis, also 0
// when facing forward).
func (p *Player) Rotation() cube.Rotation {
	return p.data.Rot
}

// Collect makes the player collect the item stack passed, adding it to the inventory. The amount of items that could
// be added is returned.
func (p *Player) Collect(s item.Stack) (int, bool) {
	if p.Dead() || !p.GameMode().AllowsInteraction() {
		return 0, false
	}
	ctx := event.C(p)
	if p.Handler().HandleItemPickup(ctx, &s); ctx.Cancelled() {
		return 0, false
	}
	var added int
	if _, offHand := p.HeldItems(); !offHand.Empty() && offHand.Comparable(s) {
		added, _ = p.offHand.AddItem(s)
	}
	if s.Count() != added {
		n, _ := p.Inventory().AddItem(s.Grow(-added))
		added += n
	}
	return added, true
}

// Experience returns the amount of experience the player has.
func (p *Player) Experience() int {
	return p.experience.Experience()
}

// EnchantmentSeed is a seed used to calculate random enchantments with enchantment tables.
func (p *Player) EnchantmentSeed() int64 {
	return p.enchantSeed
}

// ResetEnchantmentSeed resets the enchantment seed to a new random value.
func (p *Player) ResetEnchantmentSeed() {
	p.enchantSeed = rand.Int64()
}

// AddExperience adds experience to the player.
func (p *Player) AddExperience(amount int) int {
	ctx := event.C(p)
	if p.Handler().HandleExperienceGain(ctx, &amount); ctx.Cancelled() {
		return 0
	}
	before := p.experience.Level()
	level, _ := p.experience.Add(amount)
	if level/5 > before/5 {
		p.PlaySound(sound.LevelUp{})
	} else if amount > 0 {
		p.PlaySound(sound.Experience{})
	}
	p.session().SendExperience(p.ExperienceLevel(), p.ExperienceProgress())
	return amount
}

// RemoveExperience removes experience from the player.
func (p *Player) RemoveExperience(amount int) {
	p.experience.Add(-amount)
	p.session().SendExperience(p.ExperienceLevel(), p.ExperienceProgress())
}

// ExperienceLevel returns the experience level of the player.
func (p *Player) ExperienceLevel() int {
	return p.experience.Level()
}

// SetExperienceLevel sets the experience level of the player. The level must have a value between 0 and 2,147,483,647,
// otherwise the method panics.
func (p *Player) SetExperienceLevel(level int) {
	p.experience.SetLevel(level)
	p.session().SendExperience(p.ExperienceLevel(), p.ExperienceProgress())
}

// ExperienceProgress returns the experience progress of the player.
func (p *Player) ExperienceProgress() float64 {
	return p.experience.Progress()
}

// SetExperienceProgress sets the experience progress of the player. The progress must have a value between 0.0 and 1.0, otherwise
// the method panics.
func (p *Player) SetExperienceProgress(progress float64) {
	p.experience.SetProgress(progress)
	p.session().SendExperience(p.ExperienceLevel(), p.ExperienceProgress())
}

// CanCollectExperience checks if the player can collect experience, which is true if the player is not dead,
// is in a game mode that allows interaction and if 100ms have passed since the last experience collection.
func (p *Player) CanCollectExperience() bool {
	if p.Dead() || !p.GameMode().AllowsInteraction() {
		return false
	}
	if last := p.lastXPPickup; last != nil && time.Since(*last) < time.Millisecond*100 {
		return false
	}
	return true
}

// CollectExperience makes the player collect the experience points passed, adding it to the experience manager. A bool
// is returned indicating whether the player was able to collect the experience or not, due to the 100ms delay between
// experience collection or if the player was dead or in a game mode that doesn't allow collection.
func (p *Player) CollectExperience(value int) bool {
	if !p.CanCollectExperience() {
		return false
	}
	value = p.mendItems(value)
	now := time.Now()
	p.lastXPPickup = &now
	if value > 0 {
		return p.AddExperience(value) > 0
	}

	p.PlaySound(sound.Experience{})
	return true
}

// mendItems handles the mending enchantment when collecting experience, it then returns the leftover experience.
func (p *Player) mendItems(xp int) int {
	mendingItems := make([]item.Stack, 0, 6)
	held, offHand := p.HeldItems()
	if _, ok := offHand.Enchantment(enchantment.Mending); ok && offHand.Durability() < offHand.MaxDurability() {
		mendingItems = append(mendingItems, offHand)
	}
	if _, ok := held.Enchantment(enchantment.Mending); ok && held.Durability() < held.MaxDurability() {
		mendingItems = append(mendingItems, held)
	}
	for _, i := range p.Armour().Items() {
		if i.Durability() == i.MaxDurability() {
			continue
		}
		if _, ok := i.Enchantment(enchantment.Mending); ok {
			mendingItems = append(mendingItems, i)
		}
	}
	length := len(mendingItems)
	if length == 0 {
		return xp
	}
	foundItem := mendingItems[rand.IntN(length)]
	repairAmount := math.Min(float64(foundItem.MaxDurability()-foundItem.Durability()), float64(xp*2))
	repairedItem := foundItem.WithDurability(foundItem.Durability() + int(repairAmount))
	if repairAmount >= 2 {
		// mending removes 1 experience point for every 2 durability points. If the repaired durability is less than 2,
		// then no experience is removed.
		xp -= int(math.Ceil(repairAmount / 2))
	}
	if offHand.Equal(foundItem) {
		p.SetHeldItems(held, repairedItem)
	} else if held.Equal(foundItem) {
		p.SetHeldItems(repairedItem, offHand)
	} else if slot, ok := p.Armour().Inventory().First(foundItem); ok {
		_ = p.Armour().Inventory().SetItem(slot, repairedItem)
	}
	return xp
}

// Drop makes the player drop the item.Stack passed as an entity.Item, so that it may be picked up from the
// ground.
// The dropped item entity has a pickup delay of 2 seconds.
// The number of items that was dropped in the end is returned. It is generally the count of the stack passed
// or 0 if dropping the item.Stack was cancelled.
func (p *Player) Drop(s item.Stack) int {
	ctx := event.C(p)
	if p.Handler().HandleItemDrop(ctx, s); ctx.Cancelled() {
		return 0
	}
	opts := world.EntitySpawnOpts{Position: p.Position().Add(mgl64.Vec3{0, 1.4}), Velocity: p.Rotation().Vec3().Mul(0.4)}
	p.tx.AddEntity(entity.NewItemPickupDelay(opts, s, time.Second*2))
	return s.Count()
}

// OpenBlockContainer opens a block container, such as a chest, at the position passed. If no container was
// present at that location, OpenBlockContainer does nothing.
// OpenBlockContainer will also do nothing if the player has no session connected to it.
func (p *Player) OpenBlockContainer(pos cube.Pos, tx *world.Tx) {
	if p.session() != session.Nop {
		p.session().OpenBlockContainer(pos, tx)
	}
}

// HideEntity hides a world.Entity from the Player so that it can under no circumstance see it. Hidden entities can be
// made visible again through a call to ShowEntity.
func (p *Player) HideEntity(e world.Entity) {
	if p.session() != session.Nop && p.H() != e.H() {
		p.session().StopShowingEntity(e)
	}
}

// ShowEntity shows a world.Entity previously hidden from the Player using HideEntity. It does nothing if the entity
// wasn't currently hidden.
func (p *Player) ShowEntity(e world.Entity) {
	if p.session() != session.Nop {
		p.session().StartShowingEntity(e)
	}
}

// Latency returns a rolling average of latency between the sending and the receiving end of the connection of
// the player.
// The latency returned is updated continuously and is half the round trip time (RTT).
// If the Player does not have a session associated with it, Latency returns 0.
func (p *Player) Latency() time.Duration {
	if p.session() == session.Nop {
		return 0
	}
	return p.session().Latency()
}

// Tick ticks the entity, performing actions such as checking if the player is still breaking a block.
func (p *Player) Tick(tx *world.Tx, current int64) {
	if p.Dead() {
		return
	}
	if _, ok := p.tx.Liquid(cube.PosFromVec3(p.Position())); !ok {
		p.StopSwimming()
		if _, ok := p.Armour().Helmet().Item().(item.TurtleShell); ok {
			p.AddEffect(effect.New(effect.WaterBreathing, 1, time.Second*10).WithoutParticles())
		}
	}

	if _, ok := p.Armour().Chestplate().Item().(item.Elytra); ok && p.Gliding() {
		if p.glideTicks += 1; p.glideTicks%20 == 0 {
			d := p.damageItem(p.Armour().Chestplate(), 1)
			p.armour.SetChestplate(d)
			if d.Durability() < 2 {
				p.StopGliding()
			}
		}
	}

	p.checkBlockCollisions(p.data.Vel)
	p.onGround = p.checkOnGround(mgl64.Vec3{})
	p.checkEntitySteppers()

	p.effects.Tick(p, p.tx)

	p.tickFood()
	p.tickAirSupply()

	if p.Position()[1] < float64(p.tx.Range()[0]) {
		p.Hurt(4, entity.VoidDamageSource{})
	}
	if p.insideOfSolid() {
		p.Hurt(1, entity.SuffocationDamageSource{})
	}

	if p.OnFireDuration() > 0 {
		p.fireTicks -= 1
		if !p.GameMode().AllowsTakingDamage() || p.OnFireDuration() <= 0 || p.tx.RainingAt(cube.PosFromVec3(p.Position())) {
			p.Extinguish()
		}
		if p.OnFireDuration()%time.Second == 0 {
			p.Hurt(1, block.FireDamageSource{})
		}
	}

	held, _ := p.HeldItems()
	if current%4 == 0 && p.usingItem {
		if _, ok := held.Item().(item.Consumable); ok {
			// Eating particles seem to happen roughly every 4 ticks.
			for _, v := range p.viewers() {
				v.ViewEntityAction(p, entity.EatAction{})
			}
		}
	}

	if p.usingItem {
		if c, ok := held.Item().(item.Chargeable); ok {
			c.ContinueCharge(p, tx, p.useContext(), p.useDuration())
		}
	}
	if p.breaking {
		p.ContinueBreaking(p.breakingFace)
	}

	for it, ti := range p.cooldowns {
		if time.Now().After(ti) {
			delete(p.cooldowns, it)
		}
	}

	p.session().SendDebugShapes(tx.World().Dimension())
	p.session().SendHudUpdates()

	if p.prevWorld != tx.World() && p.prevWorld != nil {
		p.Handler().HandleChangeWorld(p, p.prevWorld, tx.World())
	}
	p.prevWorld = tx.World()

	if p.session() == session.Nop && !p.Immobile() {
		m := p.mc.TickMovement(p, p.Position(), p.Velocity(), p.Rotation(), p.tx)
		m.Send()

		p.data.Vel = m.Velocity()
		p.Move(m.Position().Sub(p.Position()), 0, 0)
	} else {
		p.data.Vel = mgl64.Vec3{}
	}
}

// ViewLayer returns the ViewLayer attached to the player's session.
func (p *Player) ViewLayer() *world.ViewLayer {
	return p.session().ViewLayer()
}

// ViewNameTag overrides the public name tag of the entity for this player.
func (p *Player) ViewNameTag(entity world.Entity, nameTag string) {
	p.session().ViewNameTag(entity, nameTag)
}

// ViewPublicNameTag removes the name tag override of the entity for this player.
func (p *Player) ViewPublicNameTag(entity world.Entity) {
	p.session().ViewPublicNameTag(entity)
}

// ViewScoreTag overrides the public score tag of the entity for this player.
func (p *Player) ViewScoreTag(entity world.Entity, scoreTag string) {
	p.session().ViewScoreTag(entity, scoreTag)
}

// ViewPublicScoreTag removes the score tag override of the entity for this player.
func (p *Player) ViewPublicScoreTag(entity world.Entity) {
	p.session().ViewPublicScoreTag(entity)
}

// ViewVisibility overrides the public visibility of the entity for this player.
func (p *Player) ViewVisibility(entity world.Entity, level world.VisibilityLevel) {
	p.session().ViewVisibility(entity, level)
}

// RemoveViewLayer removes all view-layer overrides of the entity for this player.
func (p *Player) RemoveViewLayer(entity world.Entity) {
	p.session().RemoveViewLayer(entity)
}

// tickAirSupply tick's the player's air supply, consuming it when underwater, and replenishing it when out of water.
func (p *Player) tickAirSupply() {
	if !p.canBreathe() {
		if r, ok := p.Armour().Helmet().Enchantment(enchantment.Respiration); ok && rand.Float64() <= enchantment.Respiration.Chance(r.Level()) {
			// respiration grants a chance to avoid drowning damage every tick.
			return
		}
		if p.airSupplyTicks -= 1; p.airSupplyTicks <= -20 {
			p.airSupplyTicks = 0
			p.Hurt(2, entity.DrowningDamageSource{})
		}
		p.breathing = false
		p.updateState()
	} else if !p.breathing && p.airSupplyTicks < p.maxAirSupplyTicks {
		p.airSupplyTicks = min(p.airSupplyTicks+5, p.maxAirSupplyTicks)
		p.breathing = p.airSupplyTicks == p.maxAirSupplyTicks
		p.updateState()
	}
}

// tickFood ticks food related functionality, such as the depletion of the food bar and regeneration if it
// is full enough.
func (p *Player) tickFood() {
	if p.hunger.foodTick%10 == 0 && (p.hunger.canQuicklyRegenerate() || p.tx.World().Difficulty().FoodRegenerates()) {
		if p.tx.World().Difficulty().FoodRegenerates() {
			p.AddFood(1)
		}
		if p.hunger.foodTick%20 == 0 {
			p.regenerate(true)
		}
	}
	if p.hunger.foodTick == 1 {
		if p.hunger.canRegenerate() {
			p.regenerate(false)
		} else if p.hunger.starving() {
			p.starve()
		}
	}

	if !p.hunger.canSprint() {
		p.StopSprinting()
	}

	p.hunger.foodTick++
	if p.hunger.foodTick > 80 {
		p.hunger.foodTick = 1
	}
}

// regenerate attempts to regenerate half a heart of health, typically caused by a full food bar.
func (p *Player) regenerate(exhaust bool) {
	if p.Health() == p.MaxHealth() {
		return
	}
	p.Heal(1, entity.FoodHealingSource{})
	if exhaust {
		p.Exhaust(6)
	}
}

// starve deals starvation damage to the player if the difficult allows it. In peaceful mode, no damage will
// ever be dealt. In easy mode, damage will only be dealt if the player has more than 10 health. In normal
// mode, damage will only be dealt if the player has more than 2 health and in hard mode, damage will always
// be dealt.
func (p *Player) starve() {
	if p.Health() > p.tx.World().Difficulty().StarvationHealthLimit() {
		p.Hurt(1, StarvationDamageSource{})
	}
}

// AirSupply returns the player's remaining air supply.
func (p *Player) AirSupply() time.Duration {
	return time.Duration(p.airSupplyTicks) * time.Second / 20
}

// SetAirSupply sets the player's remaining air supply.
func (p *Player) SetAirSupply(duration time.Duration) {
	p.airSupplyTicks = int(duration.Milliseconds() / 50)
	p.updateState()
}

// MaxAirSupply returns the player's maximum air supply.
func (p *Player) MaxAirSupply() time.Duration {
	return time.Duration(p.maxAirSupplyTicks) * time.Second / 20
}

// SetMaxAirSupply sets the player's maximum air supply.
func (p *Player) SetMaxAirSupply(duration time.Duration) {
	p.maxAirSupplyTicks = int(duration.Milliseconds() / 50)
	p.updateState()
}

// canBreathe returns true if the player can currently breathe.
func (p *Player) canBreathe() bool {
	canTakeDamage := p.GameMode().AllowsTakingDamage()
	_, waterBreathing := p.effects.Effect(effect.WaterBreathing)
	_, conduitPower := p.effects.Effect(effect.ConduitPower)
	return !canTakeDamage || waterBreathing || conduitPower || (!p.insideOfWater() && !p.insideOfSolid())
}

// breathingDistanceBelowEyes is the lowest distance the player can be in water and still be able to breathe based on
// the player's eye height.
const breathingDistanceBelowEyes = 0.11111111

// insideOfWater returns true if the player is currently underwater.
func (p *Player) insideOfWater() bool {
	pos := cube.PosFromVec3(entity.EyePosition(p))
	if l, ok := p.tx.Liquid(pos); ok {
		if _, ok := l.(block.Water); ok {
			d := float64(l.SpreadDecay()) + 1
			if l.LiquidFalling() {
				d = 1
			}
			return p.Position().Y() < (pos.Side(cube.FaceUp).Vec3().Y())-(d/9-breathingDistanceBelowEyes)
		}
	}
	return false
}

// insideOfSolid returns true if the player is inside a solid block.
func (p *Player) insideOfSolid() bool {
	pos := cube.PosFromVec3(entity.EyePosition(p))
	b, box := p.tx.Block(pos), p.handle.Type().BBox(p).Translate(p.Position())

	_, solid := b.Model().(model.Solid)
	if !solid {
		// Not solid.
		return false
	}
	d, diffuses := b.(block.LightDiffuser)
	if diffuses && d.LightDiffusionLevel() == 0 {
		// Transparent.
		return false
	}
	for _, blockBox := range b.Model().BBox(pos, p.tx) {
		if blockBox.Translate(pos.Vec3()).IntersectsWith(box) {
			return true
		}
	}
	return false
}

// checkCollisions checks the player's block collisions.
func (p *Player) checkBlockCollisions(vel mgl64.Vec3) {
	entityBBox := Type.BBox(p).Translate(p.Position())
	deltaX, deltaY, deltaZ := vel[0], vel[1], vel[2]

	p.checkEntityInsiders(entityBBox)

	grown := entityBBox.Extend(vel).Grow(0.25)
	low, high := grown.Min(), grown.Max()
	minX, minY, minZ := int(math.Floor(low[0])), int(math.Floor(low[1])), int(math.Floor(low[2]))
	maxX, maxY, maxZ := int(math.Ceil(high[0])), int(math.Ceil(high[1])), int(math.Ceil(high[2]))

	// A prediction of one BBox per block, plus an additional 2, in case
	blocks := make([]cube.BBox, 0, (maxX-minX)*(maxY-minY)*(maxZ-minZ)+2)
	for y := minY; y <= maxY; y++ {
		for x := minX; x <= maxX; x++ {
			for z := minZ; z <= maxZ; z++ {
				pos := cube.Pos{x, y, z}
				boxes := p.tx.Block(pos).Model().BBox(pos, p.tx)
				for _, box := range boxes {
					blocks = append(blocks, box.Translate(pos.Vec3()))
				}
			}
		}
	}

	// epsilon is the epsilon used for thresholds for change used for change in position and velocity.
	const epsilon = 0.001

	if !mgl64.FloatEqualThreshold(deltaY, 0, epsilon) {
		// First we move the entity BBox on the Y axis.
		for _, blockBBox := range blocks {
			deltaY = entityBBox.YOffset(blockBBox, deltaY)
		}
		entityBBox = entityBBox.Translate(mgl64.Vec3{0, deltaY})
	}
	if !mgl64.FloatEqualThreshold(deltaX, 0, epsilon) {
		// Then on the X axis.
		for _, blockBBox := range blocks {
			deltaX = entityBBox.XOffset(blockBBox, deltaX)
		}
		entityBBox = entityBBox.Translate(mgl64.Vec3{deltaX})
	}
	if !mgl64.FloatEqualThreshold(deltaZ, 0, epsilon) {
		// And finally on the Z axis.
		for _, blockBBox := range blocks {
			deltaZ = entityBBox.ZOffset(blockBBox, deltaZ)
		}
	}

	p.collidedHorizontally = !mgl64.FloatEqual(deltaX, vel[0]) || !mgl64.FloatEqual(deltaZ, vel[2])
	p.collidedVertically = !mgl64.FloatEqual(deltaY, vel[1])
}

// checkEntityInsiders checks if the player is colliding with any EntityInsider blocks.
func (p *Player) checkEntityInsiders(entityBBox cube.BBox) {
	box := entityBBox.Grow(-0.0001)
	low, high := cube.PosFromVec3(box.Min()), cube.PosFromVec3(box.Max())

	for y := low[1]; y <= high[1]; y++ {
		for x := low[0]; x <= high[0]; x++ {
			for z := low[2]; z <= high[2]; z++ {
				blockPos := cube.Pos{x, y, z}
				b := p.tx.Block(blockPos)
				if collide, ok := b.(block.EntityInsider); ok {
					collide.EntityInside(blockPos, p.tx, p)
					if _, liquid := b.(world.Liquid); liquid {
						continue
					}
				}

				if l, ok := p.tx.Liquid(blockPos); ok {
					if collide, ok := l.(block.EntityInsider); ok {
						collide.EntityInside(blockPos, p.tx, p)
					}
				}
			}
		}
	}
}

// checkEntitySteppers checks if the player is standing on any EntityStepper blocks.
func (p *Player) checkEntitySteppers() {
	if !p.OnGround() {
		return
	}
	box := Type.BBox(p).Translate(p.Position()).Grow(-0.0001)
	low, high := cube.PosFromVec3(box.Min()), cube.PosFromVec3(box.Max())
	y := int(math.Floor(box.Min()[1] - 0.0001))

	for x := low[0]; x <= high[0]; x++ {
		for z := low[2]; z <= high[2]; z++ {
			pos := cube.Pos{x, y, z}
			if stepper, ok := p.tx.Block(pos).(block.EntityStepper); ok {
				stepper.EntityStepOn(pos, p.tx, p)
				return
			}
		}
	}
}

// checkOnGround checks if the player is currently considered to be on the ground.
func (p *Player) checkOnGround(deltaPos mgl64.Vec3) bool {
	box := Type.BBox(p).Translate(p.Position()).Extend(mgl64.Vec3{0, -0.05}).Extend(deltaPos.Mul(-1.0))
	b := box.Grow(1)

	epsilon := mgl64.Vec3{mgl64.Epsilon, mgl64.Epsilon, mgl64.Epsilon}
	low, high := cube.PosFromVec3(b.Min().Add(epsilon)), cube.PosFromVec3(b.Max().Sub(epsilon))
	for x := low[0]; x <= high[0]; x++ {
		for z := low[2]; z <= high[2]; z++ {
			for y := low[1]; y < high[1]; y++ {
				pos := cube.Pos{x, y, z}
				for _, bb := range p.tx.Block(pos).Model().BBox(pos, p.tx) {
					if bb.Translate(pos.Vec3()).IntersectsWith(box) {
						return true
					}
				}
			}
		}
	}
	return false
}

// Scale returns the scale modifier of the Player. The default value for a normal scale is 1. A scale of 0
// will make the Player completely invisible.
func (p *Player) Scale() float64 {
	return p.scale
}

// SetScale changes the scale modifier of the Player. The default value for a normal scale is 1. A scale of 0
// will make the Player completely invisible.
func (p *Player) SetScale(s float64) {
	p.scale = s
	p.updateState()
}

// OnGround checks if the player is considered to be on the ground.
func (p *Player) OnGround() bool {
	if p.session() == session.Nop {
		return p.mc.OnGround()
	}
	return p.onGround
}

// EyeHeight returns the eye height of the player: 1.62, 1.26 if player is sneaking or 0.52 if the player is
// swimming, gliding or crawling.
func (p *Player) EyeHeight() float64 {
	switch {
	case p.swimming || p.crawling || p.gliding:
		return 0.4
	case p.sneaking:
		return 1.27
	default:
		return 1.62
	}
}

// TorsoHeight returns the player's torso offset above its feet. This is 0.1 blocks below the eye height.
func (p *Player) TorsoHeight() float64 {
	return p.EyeHeight() - 0.1
}

// PlaySound plays a world.Sound that only this Player can hear. Unlike World.PlaySound, it is not broadcast
// to players around it.
func (p *Player) PlaySound(sound world.Sound) {
	p.session().PlaySound(sound, entity.EyePosition(p))
}

// ShowParticle shows a particle that only this Player can see. Unlike World.AddParticle, it is not broadcast
// to players around it.
func (p *Player) ShowParticle(pos mgl64.Vec3, particle world.Particle) {
	p.session().ViewParticle(pos, particle)
}

// OpenSign makes the player open the sign at the cube.Pos passed, with the specific side provided. The client will not
// show the interface if it is not aware of a sign at the position.
func (p *Player) OpenSign(pos cube.Pos, frontSide bool) {
	p.session().OpenSign(pos, frontSide)
}

// EditSign edits the sign at the cube.Pos passed and writes the text passed to a sign at that position. If no sign is
// present, an error is returned.
func (p *Player) EditSign(pos cube.Pos, frontText, backText string) error {
	sign, ok := p.tx.Block(pos).(block.Sign)
	if !ok {
		return fmt.Errorf("edit sign: no sign at position %v", pos)
	}

	if sign.Waxed {
		return nil
	} else if frontText == sign.Front.Text && backText == sign.Back.Text {
		return nil
	}

	ctx := event.C(p)
	if frontText != sign.Front.Text {
		if p.Handler().HandleSignEdit(ctx, pos, true, sign.Front.Text, frontText); ctx.Cancelled() {
			p.resendNearbyBlock(pos)
			return nil
		}
		sign.Front.Text = frontText
		sign.Front.Owner = p.XUID()
	} else {
		if p.Handler().HandleSignEdit(ctx, pos, false, sign.Back.Text, backText); ctx.Cancelled() {
			p.resendNearbyBlock(pos)
			return nil
		}
		sign.Back.Text = backText
		sign.Back.Owner = p.XUID()
	}
	p.tx.SetBlock(pos, sign, nil)
	return nil
}

// TurnLecternPage edits the lectern at the cube.Pos passed by turning the page to the page passed. If no lectern is
// present, an error is returned.
func (p *Player) TurnLecternPage(pos cube.Pos, page int) error {
	lectern, ok := p.tx.Block(pos).(block.Lectern)
	if !ok {
		return fmt.Errorf("edit lectern: no lectern at position %v", pos)
	}

	ctx := event.C(p)
	if p.Handler().HandleLecternPageTurn(ctx, pos, lectern.Page, &page); ctx.Cancelled() {
		return nil
	}

	lectern.Page = page
	p.tx.SetBlock(pos, lectern, nil)
	return nil
}

// updateState updates the state of the player to all viewers of the player.
func (p *Player) updateState() {
	for _, v := range p.viewers() {
		v.ViewEntityState(p)
	}
}

// Breathing checks if the player is currently able to breathe. If it's underwater and the player does not
// have the water breathing or conduit power effect, this returns false.
// If the player is in creative or spectator mode, Breathing always returns true.
func (p *Player) Breathing() bool {
	_, breathing := p.Effect(effect.WaterBreathing)
	_, conduitPower := p.Effect(effect.ConduitPower)
	_, submerged := p.tx.Liquid(cube.PosFromVec3(entity.EyePosition(p)))
	return !p.GameMode().AllowsTakingDamage() || !submerged || breathing || conduitPower
}

// SwingArm makes the player swing its arm.
func (p *Player) SwingArm() {
	if p.Dead() {
		return
	}
	for _, v := range p.viewers() {
		v.ViewEntityAction(p, entity.SwingArmAction{})
	}
}

// PunchAir makes the player punch the air and plays the sound for attacking with no damage.
func (p *Player) PunchAir() {
	if p.Dead() {
		return
	}
	ctx := event.C(p)
	if p.Handler().HandlePunchAir(ctx); ctx.Cancelled() {
		return
	}
	p.SwingArm()
	p.tx.PlaySound(p.Position(), sound.Attack{})
}

// UpdateDiagnostics updates the diagnostics of the player.
func (p *Player) UpdateDiagnostics(d session.Diagnostics) {
	p.Handler().HandleDiagnostics(p, d)
}

// ShowHudElement shows a HUD element to the player if it is not already shown.
func (p *Player) ShowHudElement(e hud.Element) {
	p.session().ShowHudElement(e)
}

// HideHudElement hides a HUD element from the player if it is not already hidden.
func (p *Player) HideHudElement(e hud.Element) {
	p.session().HideHudElement(e)
}

// HudElementHidden checks if a HUD element is currently hidden from the player.
func (p *Player) HudElementHidden(e hud.Element) bool {
	return p.session().HudElementHidden(e)
}

// AddDebugShape adds a debug shape to be rendered to the player. If the shape already exists, it will be
// updated with the new information.
func (p *Player) AddDebugShape(shape debug.Shape) {
	p.session().AddDebugShape(shape)
}

// RemoveDebugShape removes a debug shape from the player by its unique identifier.
func (p *Player) RemoveDebugShape(shape debug.Shape) {
	p.session().RemoveDebugShape(shape)
}

// VisibleDebugShapes returns a slice of all debug shapes that are currently being shown to the player.
func (p *Player) VisibleDebugShapes() []debug.Shape {
	return p.session().VisibleDebugShapes()
}

// RemoveAllDebugShapes removes all rendered debug shapes from the player, as well as any shapes that have
// not yet been rendered.
func (p *Player) RemoveAllDebugShapes() {
	p.session().RemoveAllDebugShapes()
}

// damageItem damages the item stack passed with the damage passed and returns the new stack. If the item
// broke, a breaking sound is played.
// If the player is not survival, the original stack is returned.
func (p *Player) damageItem(s item.Stack, d int) item.Stack {
	if p.GameMode().CreativeInventory() || d == 0 || s.MaxDurability() == -1 {
		return s
	}
	ctx := event.C(p)
	if p.Handler().HandleItemDamage(ctx, s, &d); ctx.Cancelled() || d <= 0 {
		return s
	}
	if e, ok := s.Enchantment(enchantment.Unbreaking); ok {
		d = enchantment.Unbreaking.Reduce(s.Item(), e.Level(), d)
	}
	if s = s.Damage(d); s.Empty() {
		p.tx.PlaySound(p.Position(), sound.ItemBreak{})
	}
	return s
}

// subtractItem subtracts d from the count of the item stack passed and returns it, if the player is in
// survival or adventure mode.
func (p *Player) subtractItem(s item.Stack, d int) item.Stack {
	if !p.GameMode().CreativeInventory() && d != 0 {
		return s.Grow(-d)
	}
	return s
}

// addNewItem adds the new item of the context passed to the inventory.
func (p *Player) addNewItem(ctx *item.UseContext) {
	if (ctx.NewItemSurvivalOnly && p.GameMode().CreativeInventory()) || ctx.NewItem.Empty() {
		return
	}
	held, left := p.HeldItems()
	if held.Empty() {
		p.SetHeldItems(ctx.NewItem, left)
		return
	}
	n, err := p.Inventory().AddItem(ctx.NewItem)
	if err != nil {
		// Not all items could be added to the inventory, so drop the rest.
		p.Drop(ctx.NewItem.Grow(ctx.NewItem.Count() - n))
	}
	if p.Dead() {
		p.dropItems()
	}
}

// canReach checks if a player can reach a position with its current range. The range depends on if the player
// is either survival or creative mode.
func (p *Player) canReach(pos mgl64.Vec3) bool {
	dist := entity.EyePosition(p).Sub(pos).Len()
	return !p.Dead() && p.GameMode().AllowsInteraction() &&
		(dist <= 8.0 || (dist <= 14.0 && p.GameMode().CreativeInventory()))
}

// Disconnect closes the player and removes it from the world.
// Disconnect, unlike Close, allows a custom message to be passed to show to the player when it is
// disconnected. The message is formatted following the rules of fmt.Sprintln without a newline at the end.
func (p *Player) Disconnect(msg ...any) {
	p.once.Do(func() {
		p.close(format(msg))
	})
}

// Close closes the player and removes it from the world.
// Close disconnects the player with a 'Connection closed.' message. Disconnect should be used to disconnect a
// player with a custom message.
func (p *Player) Close() error {
	p.once.Do(func() {
		p.close("Connection closed.")
	})
	return nil
}

// close closes the player without disconnecting it. It executes code shared by both the closing and the
// disconnecting of players.
func (p *Player) close(msg string) {
	// If the player is being disconnected while they are dead, we respawn the player
	// so that the player logic works correctly the next time they join.
	if p.Dead() && p.session() != nil {
		p.respawn(func(np *Player) {
			np.quit(msg)
		})
		return
	}
	p.quit(msg)
}

func (p *Player) quit(msg string) {
	p.h.HandleQuit(p)
	p.h = NopHandler{}

	if s := p.s; s != nil {
		s.Disconnect(msg)
		s.CloseConnection()
		return
	}
	// Only remove the player from the world if it's not attached to a session. If it is attached to a session, the
	// session will remove the player once ready.
	p.tx.RemoveEntity(p)
	_ = p.handle.Close()
}

// Data returns the player data that needs to be saved. This is used when the player
// gets disconnected and the player provider needs to save the data.
func (p *Player) Data() Config {
	p.hunger.mu.RLock()
	defer p.hunger.mu.RUnlock()
	return Config{
		Session:             p.s,
		Skin:                p.skin,
		XUID:                p.xuid,
		UUID:                p.UUID(),
		Name:                p.nameTag,
		Locale:              p.locale,
		GameMode:            p.gameMode,
		Position:            p.Position(),
		Rotation:            p.Rotation(),
		Velocity:            p.Velocity(),
		Health:              p.Health(),
		MaxHealth:           p.MaxHealth(),
		FoodTick:            p.hunger.foodTick,
		Food:                p.hunger.foodLevel,
		Exhaustion:          p.hunger.exhaustionLevel,
		Saturation:          p.hunger.saturationLevel,
		AirSupply:           p.airSupplyTicks,
		MaxAirSupply:        p.maxAirSupplyTicks,
		EnchantmentSeed:     p.enchantSeed,
		Experience:          p.experience.Experience(),
		HeldSlot:            int(*p.heldSlot),
		Inventory:           p.inv,
		OffHand:             p.offHand,
		Armour:              p.armour,
		EnderChestInventory: p.enderChest,
		FireTicks:           p.fireTicks,
		FallDistance:        p.fallDistance,
		Effects:             p.Effects(),
	}
}

// session returns the network session of the player. If it has one, it is returned. If not, a no-op session
// is returned.
func (p *Player) session() *session.Session {
	if s := p.s; s != nil {
		return s
	}
	return session.Nop
}

// useContext returns an item.UseContext initialised for a Player.
func (p *Player) useContext() *item.UseContext {
	call := func(ctx *inventory.Context, slot int, it item.Stack, f func(ctx *inventory.Context, slot int, it item.Stack)) error {
		if ctx.Cancelled() {
			return fmt.Errorf("action was cancelled")
		}
		f(ctx, slot, it)
		if ctx.Cancelled() {
			return fmt.Errorf("action was cancelled")
		}
		return nil
	}
	return &item.UseContext{
		SwapHeldWithArmour: func(i int) {
			src, dst, srcInv, dstInv := int(*p.heldSlot), i, p.inv, p.armour.Inventory()
			srcIt, _ := srcInv.Item(src)
			dstIt, _ := dstInv.Item(dst)

			ctx := event.C(inventory.Holder(p))
			_ = call(ctx, src, srcIt, srcInv.Handler().HandleTake)
			_ = call(ctx, src, dstIt, srcInv.Handler().HandlePlace)
			_ = call(ctx, dst, dstIt, dstInv.Handler().HandleTake)
			if err := call(ctx, dst, srcIt, dstInv.Handler().HandlePlace); err == nil {
				_ = srcInv.SetItem(src, dstIt)
				_ = dstInv.SetItem(dst, srcIt)
				p.PlaySound(sound.EquipItem{Item: srcIt.Item()})
			}
		},
		FirstFunc: func(comparable func(item.Stack) bool) (item.Stack, bool) {
			_, left := p.HeldItems()
			if !left.Empty() && comparable(left) {
				return left, true
			}
			inv := p.Inventory()
			s, ok := inv.FirstFunc(comparable)
			if !ok {
				return item.Stack{}, false
			}
			it, _ := inv.Item(s)
			return it, ok
		},
	}
}

// Handler returns the Handler of the player.
func (p *Player) Handler() Handler {
	return p.h
}

// broadcastItems broadcasts the items held to viewers.
func (p *Player) broadcastItems(int, item.Stack, item.Stack) {
	for _, viewer := range p.viewers() {
		viewer.ViewEntityItems(p)
	}
}

// broadcastArmour broadcasts the armour equipped to viewers.
func (p *Player) broadcastArmour(_ int, before, after item.Stack) {
	if before.Comparable(after) && before.Empty() == after.Empty() {
		// Only send armour if the type of the armour changed.
		return
	}
	for _, viewer := range p.viewers() {
		viewer.ViewEntityArmour(p)
	}
}

// viewers returns a list of all viewers of the Player.
func (p *Player) viewers() []world.Viewer {
	viewers := p.tx.Viewers(p.Position())
	var s world.Viewer = p.session()
	if slices.Index(viewers, s) == -1 && p.s != nil {
		return append(viewers, p.s)
	}
	return viewers
}

// withinChunkRadius checks if the position provided is within the chunk radius of the player.
func (p *Player) withinChunkRadius(pos mgl64.Vec3) bool {
	playerChunkX, playerChunkZ := int(p.Position().X())>>4, int(p.Position().Z())>>4
	posChunkX, posChunkZ := int(pos.X())>>4, int(pos.Z())>>4
	dx, dz := playerChunkX-posChunkX, playerChunkZ-posChunkZ
	if dx < 0 {
		dx = -dx
	}
	if dz < 0 {
		dz = -dz
	}
	r := int(p.session().ChunkRadius())
	return dx <= r && dz <= r
}

// resendNearbyBlocks resends the block at cube.Pos and its adjacent blocks (if faces provided),
// but only if they are within the player's render distance.
func (p *Player) resendNearbyBlocks(pos cube.Pos, faces ...cube.Face) {
	if p.session() == session.Nop {
		return
	}
	p.resendNearbyBlock(pos)
	for _, f := range faces {
		p.resendNearbyBlock(pos.Side(f))
	}
}

// resendNearbyBlock resends a block at cube.Pos if it is within the player's render distance.
func (p *Player) resendNearbyBlock(pos cube.Pos) {
	if p.session() == session.Nop {
		return
	}
	if !p.withinChunkRadius(pos.Vec3()) {
		// This is a safety check. Without it, clients could request block resends for arbitrary world positions
		// (including unloaded chunks). A malicious client could repeatedly trigger such requests and force the server
		// to allocate memory for chunks, potentially exhausting RAM.
		return
	}
	b := p.tx.Block(pos)
	p.session().ViewBlockUpdate(pos, b, 0)
	if _, ok := b.(world.LiquidDisplacer); ok {
		liq, _ := p.tx.Liquid(pos)
		p.session().ViewBlockUpdate(pos, liq, 1)
	}
}

// format is a utility function to format a list of values to have spaces between them, but no newline at the
// end, which is typically used for sending messages, popups and tips.
func format(a []any) string {
	return strings.TrimSuffix(strings.TrimSuffix(fmt.Sprintln(a...), "\n"), "\n")
}