class_name AnimalDefinition
extends Resource

const BEHAVIOR_GRAZER_ROUTINE := &"grazer_routine"

@export var animal_definition_id: StringName
@export var species_id: StringName
@export var display_name: String
@export var behavior_id: StringName = BEHAVIOR_GRAZER_ROUTINE
@export var supported_action_ids: Array[StringName] = []
@export var presentation_cue_id: StringName
@export_range(0.1, 10.0, 0.1) var movement_speed := 1.6


func validate() -> Array[String]:
	var errors: Array[String] = []
	if not is_valid_stable_id(animal_definition_id):
		errors.append("animal_definition_id is invalid")
	if not is_valid_stable_id(species_id):
		errors.append("species_id is invalid for '%s'" % animal_definition_id)
	if display_name.strip_edges().is_empty():
		errors.append("display_name is empty for '%s'" % animal_definition_id)
	if behavior_id != BEHAVIOR_GRAZER_ROUTINE:
		errors.append(
			"behavior_id '%s' is unsupported for '%s'" % [behavior_id, animal_definition_id]
		)
	if not is_valid_stable_id(presentation_cue_id):
		errors.append("presentation_cue_id is invalid for '%s'" % animal_definition_id)
	if not is_finite(movement_speed) or movement_speed <= 0.0:
		errors.append("movement_speed must be positive for '%s'" % animal_definition_id)
	var seen: Dictionary = {}
	for action_id in supported_action_ids:
		if not is_valid_stable_id(action_id):
			errors.append("supported action ID is invalid for '%s'" % animal_definition_id)
		elif seen.has(action_id):
			errors.append(
				"duplicate supported action '%s' for '%s'" % [action_id, animal_definition_id]
			)
		else:
			seen[action_id] = true
	return errors


func supports_action(action_id: StringName) -> bool:
	return action_id in supported_action_ids


static func is_valid_stable_id(value: Variant) -> bool:
	if value is not String and value is not StringName:
		return false
	var text := String(value)
	if text.is_empty() or text.length() > 96:
		return false
	for character in text:
		var code := character.unicode_at(0)
		if not (
			(code >= 48 and code <= 57)
			or (code >= 65 and code <= 90)
			or (code >= 97 and code <= 122)
			or character in ["_", "-", ".", ":"]
		):
			return false
	return true