up3

server/item/enchantment/efficiency.go

@@ -0,0 +1,48 @@
+package enchantment
+
+import (
+	"github.com/df-mc/dragonfly/server/item"
+	"github.com/df-mc/dragonfly/server/world"
+)
+
+// Efficiency is an enchantment that increases mining speed.
+var Efficiency efficiency
+
+type efficiency struct{}
+
+// Name ...
+func (efficiency) Name() string {
+	return "Efficiency"
+}
+
+// MaxLevel ...
+func (efficiency) MaxLevel() int {
+	return 5
+}
+
+// Cost ...
+func (efficiency) Cost(level int) (int, int) {
+	minCost := 1 + 10*(level-1)
+	return minCost, minCost + 50
+}
+
+// Rarity ...
+func (efficiency) Rarity() item.EnchantmentRarity {
+	return item.EnchantmentRarityCommon
+}
+
+// Addend returns the mining speed addend from efficiency.
+func (efficiency) Addend(level int) float64 {
+	return float64(level*level + 1)
+}
+
+// CompatibleWithEnchantment ...
+func (efficiency) CompatibleWithEnchantment(item.EnchantmentType) bool {
+	return true
+}
+
+// CompatibleWithItem ...
+func (efficiency) CompatibleWithItem(i world.Item) bool {
+	t, ok := i.(item.Tool)
+	return ok && (t.ToolType() != item.TypeSword && t.ToolType() != item.TypeNone)
+}