class_name SimulationDomainEvent
extends RefCounted

var event_id: StringName = &""
var event_type: StringName = &""
var absolute_minute := 0
var source_service: StringName = &""
var entity_ids: Array[StringName] = []
var payload: Dictionary = {}
var causation_command_id := 0

func _init(
	p_event_id: StringName = &"",
	p_event_type: StringName = &"",
	p_absolute_minute := 0,
	p_source_service: StringName = &"",
	p_entity_ids: Array[StringName] = [],
	p_payload: Dictionary = {},
	p_causation_command_id := 0
) -> void:
	event_id = p_event_id
	event_type = p_event_type
	absolute_minute = p_absolute_minute
	source_service = p_source_service
	entity_ids = p_entity_ids.duplicate()
	payload = p_payload.duplicate(true)
	causation_command_id = p_causation_command_id

func is_valid() -> bool:
	return not event_id.is_empty() \
		and not event_type.is_empty() \
		and not source_service.is_empty() \
		and absolute_minute >= 0 \
		and causation_command_id >= 0

func copy() -> SimulationDomainEvent:
	return SimulationDomainEvent.new(
		event_id,
		event_type,
		absolute_minute,
		source_service,
		entity_ids,
		payload,
		causation_command_id
	)

func to_dictionary() -> Dictionary:
	var saved_entity_ids: Array[String] = []
	for entity_id in entity_ids:
		saved_entity_ids.append(String(entity_id))
	return {
		"event_id": String(event_id),
		"event_type": String(event_type),
		"absolute_minute": absolute_minute,
		"source_service": String(source_service),
		"entity_ids": saved_entity_ids,
		"payload": payload.duplicate(true),
		"causation_command_id": causation_command_id,
	}

static func from_dictionary(data: Dictionary) -> SimulationDomainEvent:
	var restored_entity_ids: Array[StringName] = []
	var saved_entity_ids: Variant = data.get("entity_ids", [])
	if saved_entity_ids is Array:
		for entity_id: Variant in saved_entity_ids:
			restored_entity_ids.append(StringName(entity_id))
	return SimulationDomainEvent.new(
		StringName(data.get("event_id", "")),
		StringName(data.get("event_type", "")),
		int(data.get("absolute_minute", -1)),
		StringName(data.get("source_service", "")),
		restored_entity_ids,
		data.get("payload", {}) as Dictionary,
		int(data.get("causation_command_id", 0))
	)