class_name DiplomaticRelationRecord
extends RefCounted

const SCHEMA_VERSION := 1

var data: Dictionary


func _init(record_data: Dictionary = {}) -> void:
	data = record_data.duplicate(true)


static func create(
	relation_id: StringName,
	first_polity_id: StringName,
	second_polity_id: StringName,
	stance_id: StringName,
	trust: float,
	started_tick: int,
	history_event_ids: Array = []
) -> DiplomaticRelationRecord:
	var first := String(first_polity_id)
	var second := String(second_polity_id)
	if second < first:
		var swapped := first
		first = second
		second = swapped
	var normalized_history: Variant = RegionalStateSupport.normalize_history_event_ids(
		history_event_ids
	)
	if normalized_history == null:
		return null
	var record := (
		DiplomaticRelationRecord
		. new(
			{
				"schema_version": SCHEMA_VERSION,
				"relation_id": String(relation_id),
				"first_polity_id": first,
				"second_polity_id": second,
				"stance_id": String(stance_id),
				"trust": trust,
				"started_tick": started_tick,
				"history_event_ids": normalized_history,
			}
		)
	)
	return record if record.is_valid() else null


static func from_dictionary(record_data: Dictionary) -> DiplomaticRelationRecord:
	if int(record_data.get("schema_version", -1)) != SCHEMA_VERSION:
		return null
	if not (
		record_data
		. has_all(
			[
				"relation_id",
				"first_polity_id",
				"second_polity_id",
				"stance_id",
				"trust",
				"started_tick",
				"history_event_ids",
			]
		)
	):
		return null
	if not record_data["history_event_ids"] is Array:
		return null
	return create(
		StringName(record_data["relation_id"]),
		StringName(record_data["first_polity_id"]),
		StringName(record_data["second_polity_id"]),
		StringName(record_data["stance_id"]),
		float(record_data["trust"]),
		int(record_data["started_tick"]),
		record_data["history_event_ids"]
	)


func is_valid() -> bool:
	return (
		not get_relation_id().is_empty()
		and not get_first_polity_id().is_empty()
		and not get_second_polity_id().is_empty()
		and String(get_first_polity_id()) < String(get_second_polity_id())
		and not get_stance_id().is_empty()
		and is_finite(get_trust())
		and get_trust() >= -1.0
		and get_trust() <= 1.0
		and get_started_tick() >= 0
	)


func get_relation_id() -> StringName:
	return StringName(data["relation_id"])


func get_first_polity_id() -> StringName:
	return StringName(data["first_polity_id"])


func get_second_polity_id() -> StringName:
	return StringName(data["second_polity_id"])


func get_stance_id() -> StringName:
	return StringName(data["stance_id"])


func get_trust() -> float:
	return float(data["trust"])


func get_started_tick() -> int:
	return int(data["started_tick"])


func get_history_event_ids() -> Array[int]:
	return RegionalStateSupport.copy_int_array(data["history_event_ids"])


func get_pair_key() -> String:
	return RegionalStateSupport.pair_key(get_first_polity_id(), get_second_polity_id())


func to_dictionary() -> Dictionary:
	return data.duplicate(true)