class_name TargetSelector
extends RefCounted

## TargetSelector - Validates and provides target options for effects


## Get all valid targets for an effect's target specification
func get_valid_targets(
	target_spec: Dictionary,
	source: CardInstance,
	game_state
) -> Array:
	if target_spec.is_empty():
		return []

	var candidates: Array = []

	var zone = str(target_spec.get("zone", "FIELD")).to_upper()
	var owner = str(target_spec.get("owner", "ANY")).to_upper()
	var filter = target_spec.get("filter", {})
	var target_type = str(target_spec.get("type", "CHOOSE")).to_upper()

	# Handle SELF and ALL targets specially
	if target_type == "SELF":
		return [source]
	elif target_type == "ALL":
		return _get_all_matching(owner, zone, filter, source, game_state)

	# Collect candidates from appropriate zones
	match zone:
		"FIELD":
			candidates = _get_field_cards(owner, source, game_state)
		"HAND":
			candidates = _get_hand_cards(owner, source, game_state)
		"BREAK_ZONE", "BREAK":
			candidates = _get_break_zone_cards(owner, source, game_state)
		"DECK":
			candidates = _get_deck_cards(owner, source, game_state)
		_:
			# Default to field
			candidates = _get_field_cards(owner, source, game_state)

	# Apply filters using CardFilter utility
	return CardFilter.get_matching(candidates, filter, source)


## Get all cards matching filter (for "ALL" target type)
func _get_all_matching(
	owner: String,
	zone: String,
	filter: Dictionary,
	source: CardInstance,
	game_state
) -> Array:
	var candidates = _get_field_cards(owner, source, game_state)
	return CardFilter.get_matching(candidates, filter, source)


## Get cards from field
func _get_field_cards(
	owner: String,
	source: CardInstance,
	game_state
) -> Array:
	var cards: Array = []

	match owner:
		"CONTROLLER":
			var player = game_state.get_player(source.controller_index)
			if player:
				cards.append_array(_get_player_field_cards(player))
		"OPPONENT":
			var opponent = game_state.get_player(1 - source.controller_index)
			if opponent:
				cards.append_array(_get_player_field_cards(opponent))
		"ANY", _:
			for player in game_state.players:
				cards.append_array(_get_player_field_cards(player))

	return cards


## Get all field cards for a player
func _get_player_field_cards(player) -> Array:
	var cards: Array = []
	cards.append_array(player.field_forwards.get_cards())
	cards.append_array(player.field_backups.get_cards())
	return cards


## Get cards from hand
func _get_hand_cards(
	owner: String,
	source: CardInstance,
	game_state
) -> Array:
	var cards: Array = []
	var player_index = source.controller_index

	if owner == "OPPONENT":
		player_index = 1 - player_index

	var player = game_state.get_player(player_index)
	if player:
		cards.append_array(player.hand.get_cards())

	return cards


## Get cards from break zone
func _get_break_zone_cards(
	owner: String,
	source: CardInstance,
	game_state
) -> Array:
	var cards: Array = []
	var player_index = source.controller_index

	if owner == "OPPONENT":
		player_index = 1 - player_index

	var player = game_state.get_player(player_index)
	if player:
		cards.append_array(player.break_zone.get_cards())

	return cards


## Get cards from deck
func _get_deck_cards(
	owner: String,
	source: CardInstance,
	game_state
) -> Array:
	# Usually not directly targetable, used for search effects
	var cards: Array = []
	var player_index = source.controller_index

	if owner == "OPPONENT":
		player_index = 1 - player_index

	var player = game_state.get_player(player_index)
	if player:
		cards.append_array(player.deck.get_cards())

	return cards


## Validate that a set of targets meets the target specification requirements
func validate_targets(
	targets: Array,
	target_spec: Dictionary,
	source: CardInstance,
	game_state
) -> bool:
	var target_type = str(target_spec.get("type", "CHOOSE")).to_upper()

	# Check count requirements
	if target_spec.has("count"):
		var required = int(target_spec.count)
		if targets.size() != required:
			return false
	elif target_spec.has("count_up_to"):
		var max_count = int(target_spec.count_up_to)
		if targets.size() > max_count:
			return false

	# Validate each target is valid
	var valid_targets = get_valid_targets(target_spec, source, game_state)
	for target in targets:
		if target not in valid_targets:
			return false

	return true