class_name SituationAlternativeDefinition
extends Resource

@export var alternative_id: StringName
@export var display_name: String
@export_multiline var description: String
@export var resolution_predicate_ids: Array[StringName] = []
@export var dialogue_topic_ids: Array[StringName] = []
@export var commitment_terms: Dictionary = {}


func validate() -> Array[String]:
	var errors: Array[String] = []
	if alternative_id.is_empty():
		errors.append("alternative_id is empty")
	if display_name.is_empty():
		errors.append("display_name is empty for alternative '%s'" % alternative_id)
	if resolution_predicate_ids.is_empty():
		errors.append("alternative '%s' has no resolution predicates" % alternative_id)
	var seen_predicate_ids := {}
	for predicate_id in resolution_predicate_ids:
		if predicate_id.is_empty():
			errors.append("alternative '%s' has an empty resolution predicate ID" % alternative_id)
		elif seen_predicate_ids.has(predicate_id):
			errors.append(
				(
					"alternative '%s' has duplicate resolution predicate '%s'"
					% [alternative_id, predicate_id]
				)
			)
		seen_predicate_ids[predicate_id] = true
	var seen_topic_ids := {}
	for topic_id in dialogue_topic_ids:
		if topic_id.is_empty():
			errors.append("alternative '%s' has an empty dialogue topic ID" % alternative_id)
		elif seen_topic_ids.has(topic_id):
			errors.append(
				"alternative '%s' has duplicate dialogue topic '%s'" % [alternative_id, topic_id]
			)
		seen_topic_ids[topic_id] = true
	for term_key in commitment_terms:
		if not term_key is String and not term_key is StringName:
			errors.append("alternative '%s' has a non-string commitment term key" % alternative_id)
	return errors


func duplicate_alternative() -> SituationAlternativeDefinition:
	var copy := SituationAlternativeDefinition.new()
	copy.alternative_id = alternative_id
	copy.display_name = display_name
	copy.description = description
	copy.resolution_predicate_ids = resolution_predicate_ids.duplicate()
	copy.dialogue_topic_ids = dialogue_topic_ids.duplicate()
	copy.commitment_terms = commitment_terms.duplicate(true)
	return copy