up3

server/item/glass_bottle.go

@@ -0,0 +1,41 @@
+package item
+
+import (
+	"github.com/df-mc/dragonfly/server/block/cube"
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/go-gl/mathgl/mgl64"
+)
+
+// GlassBottle is an item that can hold various liquids.
+type GlassBottle struct{}
+
+// bottleFiller is implemented by blocks that can fill bottles by clicking on them.
+type bottleFiller interface {
+	// FillBottle fills a GlassBottle by interacting with a block. Blocks that implement this interface return both the
+	// block that should be placed in the world after filling the bottle, and the item that was produced as a result of
+	// the filling.
+	// If the bool returned is false, nothing will happen when using a GlassBottle on the block.
+	FillBottle() (world.Block, Stack, bool)
+}
+
+// UseOnBlock ...
+func (g GlassBottle) UseOnBlock(pos cube.Pos, _ cube.Face, _ mgl64.Vec3, tx *world.Tx, _ User, ctx *UseContext) bool {
+	bl := tx.Block(pos)
+	if b, ok := bl.(bottleFiller); ok {
+		var res world.Block
+		if res, ctx.NewItem, ok = b.FillBottle(); ok {
+			ctx.SubtractFromCount(1)
+			if res != bl {
+				// Some blocks (think a cauldron) change when using a bottle on it.
+				tx.SetBlock(pos, res, nil)
+			}
+			return true
+		}
+	}
+	return false
+}
+
+// EncodeItem ...
+func (g GlassBottle) EncodeItem() (name string, meta int16) {
+	return "minecraft:glass_bottle", 0
+}