class_name ActionEffect
extends Resource

const KIND_METRIC_DELTA := &"metric_delta"
const KIND_NEED_DELTA := &"need_delta"
const KIND_INVENTORY_TRANSFER := &"inventory_transfer"
const KIND_DAMAGE := &"damage"
const KIND_HEALING := &"healing"
const KIND_RELATIONSHIP_DELTA := &"relationship_delta"
const KIND_SCHEDULE_ACTION := &"schedule_action"
const KIND_SITE_CONDITION := &"site_condition"
const VALID_KINDS := [
	KIND_METRIC_DELTA,
	KIND_NEED_DELTA,
	KIND_INVENTORY_TRANSFER,
	KIND_DAMAGE,
	KIND_HEALING,
	KIND_RELATIONSHIP_DELTA,
	KIND_SCHEDULE_ACTION,
	KIND_SITE_CONDITION,
]

@export var effect_id: StringName
@export var effect_kind: StringName
@export var subject_key: StringName
@export var value := 0.0
@export var item_id: StringName
@export var amount := 0.0
@export var source_role: StringName
@export var destination_role: StringName
@export var scheduled_action_id: StringName
@export var parameters: Dictionary = {}


func validate() -> Array[String]:
	var errors: Array[String] = []
	if effect_id.is_empty():
		errors.append("effect_id is empty")
	if effect_kind not in VALID_KINDS:
		errors.append("effect_kind '%s' is invalid for '%s'" % [effect_kind, effect_id])
	if not is_finite(value) or not is_finite(amount):
		errors.append("numeric values must be finite for '%s'" % effect_id)
	match effect_kind:
		KIND_METRIC_DELTA, KIND_NEED_DELTA, KIND_RELATIONSHIP_DELTA, KIND_SITE_CONDITION:
			if subject_key.is_empty():
				errors.append("subject_key is empty for '%s'" % effect_id)
		KIND_INVENTORY_TRANSFER:
			if item_id.is_empty() or amount <= 0.0:
				errors.append(
					"inventory transfer '%s' needs an item and positive amount" % effect_id
				)
			if source_role.is_empty() or destination_role.is_empty():
				errors.append("inventory transfer '%s' needs source/destination roles" % effect_id)
		KIND_DAMAGE, KIND_HEALING:
			if amount <= 0.0:
				errors.append("effect '%s' needs a positive amount" % effect_id)
		KIND_SCHEDULE_ACTION:
			if scheduled_action_id.is_empty():
				errors.append("scheduled action is empty for '%s'" % effect_id)
	if WorldTargetCapability._contains_object(parameters):
		errors.append("parameters contain a runtime object for '%s'" % effect_id)
	return errors