up3

server/item/enchantment/respiration.go

@@ -0,0 +1,49 @@
+package enchantment
+
+import (
+	"github.com/df-mc/dragonfly/server/item"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// Respiration extends underwater breathing time by +15 seconds per enchantment
+// level in addition to the default time of 15 seconds.
+var Respiration respiration
+
+type respiration struct{}
+
+// Name ...
+func (respiration) Name() string {
+	return "Respiration"
+}
+
+// MaxLevel ...
+func (respiration) MaxLevel() int {
+	return 3
+}
+
+// Cost ...
+func (respiration) Cost(level int) (int, int) {
+	minCost := 10 * level
+	return minCost, minCost + 30
+}
+
+// Rarity ...
+func (respiration) Rarity() item.EnchantmentRarity {
+	return item.EnchantmentRarityRare
+}
+
+// Chance returns the chance of the enchantment blocking the air supply from ticking.
+func (respiration) Chance(level int) float64 {
+	return 1.0 / float64(level+1)
+}
+
+// CompatibleWithEnchantment ...
+func (respiration) CompatibleWithEnchantment(item.EnchantmentType) bool {
+	return true
+}
+
+// CompatibleWithItem ...
+func (respiration) CompatibleWithItem(i world.Item) bool {
+	h, ok := i.(item.HelmetType)
+	return ok && h.Helmet()
+}