class_name EventDefinition
extends RefCounted

const EventConditionType = preload("res://scripts/events/event_condition.gd")
const EventActionType = preload("res://scripts/events/event_action.gd")
const EventChoiceType = preload("res://scripts/events/event_choice.gd")

enum TransactionPolicy {
	ROLLBACK_ALL,
	SKIP_FAILED,
	BRANCH_FAILURE,
}

enum OnceScope {
	NONE,
	PER_DAY,
	PER_ACTOR_PAIR,
	PER_SAVE,
}

enum MissingActorPolicy {
	CANCEL,
	REPLACE_WITH_ROLE,
	CONTINUE_WITHOUT,
	BRANCH_FAILURE,
}

enum ContentRating {
	GENERAL,
	MATURE,
	RESTRICTED,
}

enum FilterBehavior {
	NONE,
	FADE,
	REPLACE,
	DISABLE,
}

var event_id: StringName = &""
var category: StringName = &"FLAVOR"
var priority := 0
var conditions: Array[EventCondition] = []
var participant_roles: Array[StringName] = []
var location_rule: Dictionary = {}
var start_window: Array[int] = []
var expires_after := 0
var foreground := true
var interrupt_policy: StringName = &"NORMAL"
var choices: Array[EventChoice] = []
var automatic_actions: Array[EventAction] = []
var fallback_actions: Array[EventAction] = []
var failure_actions: Array[EventAction] = []
var replacement_event_id: StringName = &""
var once_scope: OnceScope = OnceScope.NONE
var transaction_policy: TransactionPolicy = TransactionPolicy.ROLLBACK_ALL
var missing_actor_policy: MissingActorPolicy = MissingActorPolicy.CANCEL
var content_rating: ContentRating = ContentRating.GENERAL
var content_tags: Array[StringName] = []
var filter_behavior: FilterBehavior = FilterBehavior.NONE


func configure(p_event_id: StringName, options: Dictionary = {}) -> EventDefinition:
	event_id = p_event_id
	category = StringName(_value(options, &"category", &"FLAVOR"))
	priority = int(_value(options, &"priority", 0))
	conditions = _conditions(_value(options, &"conditions", []))
	participant_roles = _sorted_unique_names(_value(options, &"participants", []))
	location_rule = _dictionary(_value(options, &"location_rule", {})).duplicate(true)
	start_window = _integer_array(_value(options, &"start_window", []))
	expires_after = maxi(int(_value(options, &"expires_after", 0)), 0)
	foreground = bool(_value(options, &"foreground", true))
	interrupt_policy = StringName(_value(options, &"interrupt_policy", &"NORMAL"))
	choices = _choices(_value(options, &"choices", []))
	automatic_actions = _actions(_value(options, &"automatic_actions", []))
	fallback_actions = _actions(_value(options, &"fallback_actions", []))
	failure_actions = _actions(_value(options, &"failure_actions", []))
	replacement_event_id = StringName(_value(options, &"replacement_event_id", &""))
	once_scope = _enum_value(OnceScope.keys(), _value(options, &"once_scope", OnceScope.NONE), OnceScope.NONE) as OnceScope
	transaction_policy = _enum_value(TransactionPolicy.keys(), _value(options, &"transaction_policy", TransactionPolicy.ROLLBACK_ALL), TransactionPolicy.ROLLBACK_ALL) as TransactionPolicy
	missing_actor_policy = _enum_value(MissingActorPolicy.keys(), _value(options, &"missing_actor_policy", MissingActorPolicy.CANCEL), MissingActorPolicy.CANCEL) as MissingActorPolicy
	content_rating = _enum_value(ContentRating.keys(), _value(options, &"content_rating", ContentRating.GENERAL), ContentRating.GENERAL) as ContentRating
	content_tags = _sorted_unique_names(_value(options, &"content_tags", []))
	filter_behavior = _enum_value(FilterBehavior.keys(), _value(options, &"filter_behavior", FilterBehavior.NONE), FilterBehavior.NONE) as FilterBehavior
	return self


func is_valid() -> bool:
	if event_id.is_empty() or category.is_empty():
		return false
	if filter_behavior == FilterBehavior.REPLACE and replacement_event_id.is_empty():
		return false
	if replacement_event_id == event_id:
		return false
	if start_window.size() not in [0, 2]:
		return false
	for condition: EventCondition in conditions:
		if condition == null or not condition.is_valid():
			return false
	var choice_ids: Dictionary = {}
	for choice: EventChoice in choices:
		if choice == null or not choice.is_valid() or choice_ids.has(choice.choice_id):
			return false
		choice_ids[choice.choice_id] = true
	for action_list: Array in [automatic_actions, fallback_actions, failure_actions]:
		for action: EventAction in action_list:
			if action == null or not action.is_valid():
				return false
	return true


func get_choice(choice_id: StringName) -> EventChoice:
	for choice: EventChoice in choices:
		if choice.choice_id == choice_id:
			return choice
	return null


func conditions_match(context: Dictionary, callbacks: Dictionary = {}) -> bool:
	for condition: EventCondition in conditions:
		if not condition.evaluate(context, callbacks):
			return false
	return true


func create_snapshot() -> Dictionary:
	return {
		&"event_id": String(event_id),
		&"category": String(category),
		&"priority": priority,
		&"conditions": _snapshots(conditions),
		&"participants": _names_to_strings(participant_roles),
		&"location_rule": location_rule.duplicate(true),
		&"start_window": start_window.duplicate(),
		&"expires_after": expires_after,
		&"foreground": foreground,
		&"interrupt_policy": String(interrupt_policy),
		&"choices": _snapshots(choices),
		&"automatic_actions": _snapshots(automatic_actions),
		&"fallback_actions": _snapshots(fallback_actions),
		&"failure_actions": _snapshots(failure_actions),
		&"replacement_event_id": String(replacement_event_id),
		&"once_scope": OnceScope.keys()[once_scope],
		&"transaction_policy": TransactionPolicy.keys()[transaction_policy],
		&"missing_actor_policy": MissingActorPolicy.keys()[missing_actor_policy],
		&"content_rating": ContentRating.keys()[content_rating],
		&"content_tags": _names_to_strings(content_tags),
		&"filter_behavior": FilterBehavior.keys()[filter_behavior],
	}


static func from_variant(raw_value: Variant) -> EventDefinition:
	if raw_value is EventDefinition:
		return raw_value
	if not raw_value is Dictionary:
		return null
	# Serialized definitions are authoritative data, not a user-facing settings
	# form. Unknown enum names and out-of-range integer values must fail closed
	# instead of silently selecting a less restrictive fallback.
	var enum_fields := [
		[&"once_scope", OnceScope.keys()],
		[&"transaction_policy", TransactionPolicy.keys()],
		[&"missing_actor_policy", MissingActorPolicy.keys()],
		[&"content_rating", ContentRating.keys()],
		[&"filter_behavior", FilterBehavior.keys()],
	]
	for field: Array in enum_fields:
		var key: StringName = field[0]
		if raw_value.has(key) or raw_value.has(String(key)):
			if _strict_enum_value(field[1], _value(raw_value, key, null)) < 0:
				return null
	return EventDefinition.new().configure(
		StringName(_value(raw_value, &"event_id", &"")),
		raw_value
	)


static func _conditions(raw_value: Variant) -> Array[EventCondition]:
	var result: Array[EventCondition] = []
	if raw_value is Array:
		for raw_entry: Variant in raw_value:
			var entry := EventConditionType.from_variant(raw_entry)
			if entry != null:
				result.append(entry)
	return result


static func _choices(raw_value: Variant) -> Array[EventChoice]:
	var result: Array[EventChoice] = []
	if raw_value is Array:
		for raw_entry: Variant in raw_value:
			var entry := EventChoiceType.from_variant(raw_entry)
			if entry != null:
				result.append(entry)
	return result


static func _actions(raw_value: Variant) -> Array[EventAction]:
	var result: Array[EventAction] = []
	if raw_value is Array:
		for raw_entry: Variant in raw_value:
			var entry := EventActionType.from_variant(raw_entry)
			if entry != null:
				result.append(entry)
	return result


static func _snapshots(values: Array) -> Array[Dictionary]:
	var result: Array[Dictionary] = []
	for value: Variant in values:
		result.append(value.create_snapshot())
	return result


static func _sorted_unique_names(raw_value: Variant) -> Array[StringName]:
	var result: Array[StringName] = []
	if raw_value is Array:
		for raw_entry: Variant in raw_value:
			var entry := StringName(raw_entry)
			if not entry.is_empty() and not result.has(entry):
				result.append(entry)
	result.sort_custom(func(a: StringName, b: StringName) -> bool: return String(a) < String(b))
	return result


static func _integer_array(raw_value: Variant) -> Array[int]:
	var result: Array[int] = []
	if raw_value is Array:
		for raw_entry: Variant in raw_value:
			result.append(int(raw_entry))
	return result


static func _names_to_strings(values: Array[StringName]) -> Array[String]:
	var result: Array[String] = []
	for value: StringName in values:
		result.append(String(value))
	return result


static func _enum_value(keys: Array, raw_value: Variant, fallback: int) -> int:
	if raw_value is int:
		return clampi(int(raw_value), 0, keys.size() - 1)
	var index := keys.find(String(raw_value).to_upper())
	return index if index >= 0 else fallback


static func _strict_enum_value(keys: Array, raw_value: Variant) -> int:
	if raw_value is int:
		var numeric := int(raw_value)
		return numeric if numeric >= 0 and numeric < keys.size() else -1
	if raw_value is String or raw_value is StringName:
		return keys.find(String(raw_value).to_upper())
	return -1


static func _value(source: Dictionary, key: StringName, fallback: Variant) -> Variant:
	if source.has(key):
		return source[key]
	return source.get(String(key), fallback)


static func _dictionary(value: Variant) -> Dictionary:
	return value if value is Dictionary else {}