class_name ItemDefinition
extends Resource

const CATEGORY_RESOURCE := SimulationIds.ITEM_CATEGORY_RESOURCE
const CATEGORY_WEAPON := SimulationIds.ITEM_CATEGORY_WEAPON
const VALID_CATEGORIES := [CATEGORY_RESOURCE, CATEGORY_WEAPON]

@export var item_id: StringName
@export var display_name: String
@export var category: StringName = CATEGORY_RESOURCE
@export var equip_slot: StringName
@export_range(0.0, 1000.0, 0.1) var damage := 0.0
@export_range(0.0, 50.0, 0.1) var reach := 0.0
@export_range(0.0, 5.0, 0.05) var attack_cooldown := 0.0


func validate() -> Array[String]:
	var errors: Array[String] = []
	if item_id.is_empty():
		errors.append("item_id is empty")
	if display_name.is_empty():
		errors.append("display_name is empty for '%s'" % item_id)
	if category not in VALID_CATEGORIES:
		errors.append("category '%s' is invalid for '%s'" % [category, item_id])
	elif category == CATEGORY_WEAPON:
		if equip_slot != SimulationIds.EQUIP_SLOT_HAND:
			errors.append(
				"weapon '%s' must equip in '%s'" % [item_id, SimulationIds.EQUIP_SLOT_HAND]
			)
		if not is_finite(damage) or damage <= 0.0:
			errors.append("damage must be positive for '%s'" % item_id)
		if not is_finite(reach) or reach <= 0.0:
			errors.append("reach must be positive for '%s'" % item_id)
		if not is_finite(attack_cooldown) or attack_cooldown <= 0.0:
			errors.append("attack_cooldown must be positive for '%s'" % item_id)
	elif not equip_slot.is_empty():
		errors.append("resource item '%s' cannot declare equip_slot '%s'" % [item_id, equip_slot])
	return errors


func is_weapon() -> bool:
	return category == CATEGORY_WEAPON


func is_resource() -> bool:
	return category == CATEGORY_RESOURCE