up3

server/item/enchantment/unbreaking.go

@@ -0,0 +1,58 @@
+package enchantment
+
+import (
+	"github.com/df-mc/dragonfly/server/item"
+	"github.com/df-mc/dragonfly/server/world"
+	"math/rand/v2"
+)
+
+// Unbreaking is an enchantment that gives a chance for an item to avoid
+// durability reduction when it is used, effectively increasing the item's
+// durability.
+var Unbreaking unbreaking
+
+type unbreaking struct{}
+
+// Name ...
+func (unbreaking) Name() string {
+	return "Unbreaking"
+}
+
+// MaxLevel ...
+func (unbreaking) MaxLevel() int {
+	return 3
+}
+
+// Cost ...
+func (unbreaking) Cost(level int) (int, int) {
+	minCost := 5 + 8*(level-1)
+	return minCost, minCost + 50
+}
+
+// Rarity ...
+func (unbreaking) Rarity() item.EnchantmentRarity {
+	return item.EnchantmentRarityUncommon
+}
+
+// CompatibleWithEnchantment ...
+func (unbreaking) CompatibleWithEnchantment(item.EnchantmentType) bool {
+	return true
+}
+
+// CompatibleWithItem ...
+func (unbreaking) CompatibleWithItem(i world.Item) bool {
+	_, ok := i.(item.Durable)
+	return ok
+}
+
+// Reduce returns the amount of damage that should be reduced with unbreaking.
+func (unbreaking) Reduce(it world.Item, level, amount int) int {
+	after := amount
+	_, ok := it.(item.Armour)
+	for i := 0; i < amount; i++ {
+		if (!ok || rand.Float64() >= 0.6) && rand.IntN(level+1) > 0 {
+			after--
+		}
+	}
+	return after
+}