Updated RecipesDB to store an array of tem_type resources instead of hardcoded slots

scripts/Recipe.gd

@@ -1,6 +1,5 @@
 extends Resource
 class_name Recipe
 
-export var item_type_in_1: Resource
-export var item_type_in_2: Resource
+export(Array, Resource) var item_type_slots
 export var item_type_out: Resource

scripts/RecipeDB.gd

@@ -3,28 +3,26 @@ class_name RecipeDB
 
 export(Array, Resource) var recipes
 
-func find_recipe(item_type_1: Resource, item_type_2: Resource) -> Resource:
-	assert(item_type_1 != null)
-	assert(item_type_2 != null)
+func find_recipe(in_item_types) -> Resource:
+	assert(in_item_types.size() != 0)
 	var in_items = {}
-	if item_type_1 == item_type_2:
-		in_items[item_type_1] = 2
-	else:
-		in_items[item_type_1] = 1
-		in_items[item_type_2] = 1
+	for in_item_type in in_item_types:
+		if in_items.has(in_item_type):
+			in_items[in_item_type] += 1
+		else:
+			in_items[in_item_type] = 1
 		
 	for recipe in recipes:
-		if recipe.item_type_in_1 == null or recipe.item_type_in_2 == null or recipe.item_type_out == null:
+		if recipe.item_type_out == null or recipe.item_type_slots.size() == 0:
 			continue
-			
-		var items = [recipe.item_type_in_1, recipe.item_type_in_2]
+		var items = recipe.item_type_slots
 		# build cost map
 		var total_cost = {}
-		for n in 2:
-			if total_cost.has(items[n]):
-				total_cost[items[n]] += 1
+		for item_type in items:
+			if total_cost.has(item_type):
+				total_cost[item_type] += 1
 			else:
-				total_cost[items[n]] = 1
+				total_cost[item_type] = 1
 				
 		# check if you can afford the cost
 		var cost_met : bool = true

scripts/crafting_machine.gd

@@ -7,7 +7,8 @@ func _ready():
 	assert(recipes != null)
 
 func craft_item():
-	var crafted_item = recipes.find_recipe($slot_1.item_in_hold.item_type, $slot_2.item_in_hold.item_type)
+	var items_in_slots = [$slot_1.item_in_hold.item_type, $slot_2.item_in_hold.item_type]
+	var crafted_item = recipes.find_recipe(items_in_slots)
 	if crafted_item == null:
 		return
 	$slot_1.destroy_item()