class_name OriginalRelationshipState
extends RefCounted

## Explicit facts only. Numeric values are not production initialization approval.
## No update, attack, reduction, threshold or route policy is defined here.
const FIELDS := ["subject_id", "protagonist_id", "rival_id", "affection", "lust", "netorare", "shield_current", "shield_max"]
var _payload: Dictionary = {}


static func from_snapshot(value: Variant) -> OriginalRelationshipState:
	if not value is Dictionary or value.size() != FIELDS.size():
		return null
	for field: String in FIELDS:
		if not value.has(field):
			return null
	for field: String in ["subject_id", "protagonist_id", "rival_id"]:
		if not (value[field] is String or value[field] is StringName) or String(value[field]).is_empty():
			return null
	if value["subject_id"] == value["protagonist_id"] or value["subject_id"] == value["rival_id"] or value["protagonist_id"] == value["rival_id"]:
		return null
	for field: String in ["affection", "lust", "netorare", "shield_current", "shield_max"]:
		if not (value[field] is int or value[field] is float):
			return null
		if value[field] is float and not is_finite(value[field]):
			return null
	if value["shield_max"] != value["affection"] or value["shield_current"] < 0 or value["shield_current"] > value["shield_max"]:
		return null
	var state := OriginalRelationshipState.new()
	state._payload = value.duplicate(true)
	return state


func create_snapshot() -> Dictionary:
	return _payload.duplicate(true)


func subject_id() -> StringName:
	return StringName(_payload.get("subject_id", ""))