class_name ConditionChecker
extends RefCounted

## Centralized condition evaluation for all ability types
## Handles conditions like "If you control X", "If you have received Y damage", etc.


## Main evaluation entry point
## Returns true if condition is met, false otherwise
func evaluate(condition: Dictionary, context: Dictionary) -> bool:
	if condition.is_empty():
		return true  # Empty condition = unconditional

	var condition_type = condition.get("type", "")

	match condition_type:
		"CONTROL_CARD":
			return _check_control_card(condition, context)
		"CONTROL_COUNT":
			return _check_control_count(condition, context)
		"DAMAGE_RECEIVED":
			return _check_damage_received(condition, context)
		"BREAK_ZONE_COUNT":
			return _check_break_zone_count(condition, context)
		"CARD_IN_ZONE":
			return _check_card_in_zone(condition, context)
		"FORWARD_STATE":
			return _check_forward_state(condition, context)
		"COST_COMPARISON":
			return _check_cost_comparison(condition, context)
		"POWER_COMPARISON":
			return _check_power_comparison(condition, context)
		"ELEMENT_MATCH":
			return _check_element_match(condition, context)
		"CARD_TYPE_MATCH":
			return _check_card_type_match(condition, context)
		"JOB_MATCH":
			return _check_job_match(condition, context)
		"CATEGORY_MATCH":
			return _check_category_match(condition, context)
		"AND":
			return _check_and(condition, context)
		"OR":
			return _check_or(condition, context)
		"NOT":
			return _check_not(condition, context)
		_:
			push_warning("ConditionChecker: Unknown condition type '%s'" % condition_type)
			return false


# =============================================================================
# CONTROL CONDITIONS
# =============================================================================

func _check_control_card(condition: Dictionary, context: Dictionary) -> bool:
	var card_name = condition.get("card_name", "")
	var player = context.get("player_id", 0)
	var game_state = context.get("game_state")

	if not game_state:
		return false

	# Check all field cards for the player
	var field_cards = _get_field_cards(game_state, player)
	for card in field_cards:
		if card and card.card_data and card.card_data.name == card_name:
			return true

	return false


func _check_control_count(condition: Dictionary, context: Dictionary) -> bool:
	var card_type = condition.get("card_type", "")
	var element = condition.get("element", "")
	var job = condition.get("job", "")
	var category = condition.get("category", "")
	var comparison = condition.get("comparison", "GTE")
	var value = condition.get("value", 1)
	var player = context.get("player_id", 0)
	var game_state = context.get("game_state")

	if not game_state:
		return false

	var count = 0
	var field_cards = _get_field_cards(game_state, player)

	for card in field_cards:
		if not card or not card.card_data:
			continue

		var matches = true

		# Check card type filter
		if card_type != "" and not _matches_card_type(card, card_type):
			matches = false

		# Check element filter
		if element != "" and not _matches_element(card, element):
			matches = false

		# Check job filter
		if job != "" and not _matches_job(card, job):
			matches = false

		# Check category filter
		if category != "" and not _matches_category(card, category):
			matches = false

		if matches:
			count += 1

	return _compare(count, comparison, value)


# =============================================================================
# DAMAGE CONDITIONS
# =============================================================================

func _check_damage_received(condition: Dictionary, context: Dictionary) -> bool:
	var comparison = condition.get("comparison", "GTE")
	var value = condition.get("value", 1)
	var player = context.get("player_id", 0)
	var game_state = context.get("game_state")

	if not game_state:
		return false

	var damage = _get_player_damage(game_state, player)
	return _compare(damage, comparison, value)


# =============================================================================
# ZONE CONDITIONS
# =============================================================================

func _check_break_zone_count(condition: Dictionary, context: Dictionary) -> bool:
	var card_name = condition.get("card_name", "")
	var card_names: Array = condition.get("card_names", [])
	if card_name != "" and card_name not in card_names:
		card_names.append(card_name)

	var comparison = condition.get("comparison", "GTE")
	var value = condition.get("value", 1)
	var player = context.get("player_id", 0)
	var game_state = context.get("game_state")

	if not game_state:
		return false

	var count = 0
	var break_zone = _get_break_zone(game_state, player)

	for card in break_zone:
		if not card or not card.card_data:
			continue

		# If no specific names, count all
		if card_names.is_empty():
			count += 1
		elif card.card_data.name in card_names:
			count += 1

	return _compare(count, comparison, value)


func _check_card_in_zone(condition: Dictionary, context: Dictionary) -> bool:
	var zone = condition.get("zone", "")  # "HAND", "DECK", "BREAK_ZONE", "REMOVED"
	var card_name = condition.get("card_name", "")
	var card_type = condition.get("card_type", "")
	var player = context.get("player_id", 0)
	var game_state = context.get("game_state")

	if not game_state:
		return false

	var zone_cards: Array = []
	match zone:
		"HAND":
			zone_cards = _get_hand(game_state, player)
		"DECK":
			zone_cards = _get_deck(game_state, player)
		"BREAK_ZONE":
			zone_cards = _get_break_zone(game_state, player)
		"REMOVED":
			zone_cards = _get_removed_zone(game_state, player)
		"FIELD":
			zone_cards = _get_field_cards(game_state, player)

	for card in zone_cards:
		if not card or not card.card_data:
			continue

		var matches = true
		if card_name != "" and card.card_data.name != card_name:
			matches = false
		if card_type != "" and not _matches_card_type(card, card_type):
			matches = false

		if matches:
			return true

	return false


# =============================================================================
# CARD STATE CONDITIONS
# =============================================================================

func _check_forward_state(condition: Dictionary, context: Dictionary) -> bool:
	var state = condition.get("state", "")  # "DULL", "ACTIVE", "DAMAGED"
	var check_self = condition.get("check_self", false)
	var target = context.get("target_card") if not check_self else context.get("source_card")

	if not target:
		return false

	match state:
		"DULL":
			return target.is_dull if target.has_method("get") or "is_dull" in target else false
		"ACTIVE":
			return not target.is_dull if "is_dull" in target else false
		"DAMAGED":
			if "current_power" in target and target.card_data:
				return target.current_power < target.card_data.power
		"FROZEN":
			return target.is_frozen if "is_frozen" in target else false

	return false


func _check_cost_comparison(condition: Dictionary, context: Dictionary) -> bool:
	var comparison = condition.get("comparison", "LTE")
	var value = condition.get("value", 0)
	var compare_to = condition.get("compare_to", "")  # "SELF_COST", "VALUE", or empty for value
	var target = context.get("target_card")
	var source = context.get("source_card")

	if not target or not target.card_data:
		return false

	var target_cost = target.card_data.cost
	var compare_value = value

	if compare_to == "SELF_COST" and source and source.card_data:
		compare_value = source.card_data.cost

	return _compare(target_cost, comparison, compare_value)


func _check_power_comparison(condition: Dictionary, context: Dictionary) -> bool:
	var comparison = condition.get("comparison", "LTE")
	var value = condition.get("value", 0)
	var compare_to = condition.get("compare_to", "")  # "SELF_POWER", "VALUE"
	var target = context.get("target_card")
	var source = context.get("source_card")

	if not target:
		return false

	var target_power = target.current_power if "current_power" in target else 0
	var compare_value = value

	if compare_to == "SELF_POWER" and source:
		compare_value = source.current_power if "current_power" in source else 0

	return _compare(target_power, comparison, compare_value)


# =============================================================================
# CARD ATTRIBUTE CONDITIONS
# =============================================================================

func _check_element_match(condition: Dictionary, context: Dictionary) -> bool:
	var element = condition.get("element", "")
	var check_self = condition.get("check_self", false)
	var target = context.get("target_card") if not check_self else context.get("source_card")

	if not target or not target.card_data:
		return false

	return _matches_element(target, element)


func _check_card_type_match(condition: Dictionary, context: Dictionary) -> bool:
	var card_type = condition.get("card_type", "")
	var check_self = condition.get("check_self", false)
	var target = context.get("target_card") if not check_self else context.get("source_card")

	if not target:
		return false

	return _matches_card_type(target, card_type)


func _check_job_match(condition: Dictionary, context: Dictionary) -> bool:
	var job = condition.get("job", "")
	var check_self = condition.get("check_self", false)
	var target = context.get("target_card") if not check_self else context.get("source_card")

	if not target or not target.card_data:
		return false

	return _matches_job(target, job)


func _check_category_match(condition: Dictionary, context: Dictionary) -> bool:
	var category = condition.get("category", "")
	var check_self = condition.get("check_self", false)
	var target = context.get("target_card") if not check_self else context.get("source_card")

	if not target or not target.card_data:
		return false

	return _matches_category(target, category)


# =============================================================================
# LOGICAL OPERATORS
# =============================================================================

func _check_and(condition: Dictionary, context: Dictionary) -> bool:
	var conditions: Array = condition.get("conditions", [])
	for sub_condition in conditions:
		if not evaluate(sub_condition, context):
			return false
	return true


func _check_or(condition: Dictionary, context: Dictionary) -> bool:
	var conditions: Array = condition.get("conditions", [])
	for sub_condition in conditions:
		if evaluate(sub_condition, context):
			return true
	return false


func _check_not(condition: Dictionary, context: Dictionary) -> bool:
	var inner: Dictionary = condition.get("condition", {})
	return not evaluate(inner, context)


# =============================================================================
# HELPER FUNCTIONS
# =============================================================================

func _compare(actual: int, comparison: String, expected: int) -> bool:
	match comparison:
		"EQ":
			return actual == expected
		"NEQ":
			return actual != expected
		"GT":
			return actual > expected
		"GTE":
			return actual >= expected
		"LT":
			return actual < expected
		"LTE":
			return actual <= expected
	return false


func _matches_card_type(card, card_type: String) -> bool:
	if not card or not card.card_data:
		return false

	var type_upper = card_type.to_upper()
	var card_type_value = card.card_data.type

	# Handle string or enum type
	if card_type_value is String:
		return card_type_value.to_upper() == type_upper

	# Handle Enums.CardType enum
	match type_upper:
		"FORWARD":
			return card_type_value == Enums.CardType.FORWARD
		"BACKUP":
			return card_type_value == Enums.CardType.BACKUP
		"SUMMON":
			return card_type_value == Enums.CardType.SUMMON
		"MONSTER":
			return card_type_value == Enums.CardType.MONSTER

	return false


func _matches_element(card, element: String) -> bool:
	if not card or not card.card_data:
		return false

	var element_upper = element.to_upper()
	var card_element = card.card_data.element

	if card_element is String:
		return card_element.to_upper() == element_upper

	# Handle Enums.Element enum
	match element_upper:
		"FIRE":
			return card_element == Enums.Element.FIRE
		"ICE":
			return card_element == Enums.Element.ICE
		"WIND":
			return card_element == Enums.Element.WIND
		"EARTH":
			return card_element == Enums.Element.EARTH
		"LIGHTNING":
			return card_element == Enums.Element.LIGHTNING
		"WATER":
			return card_element == Enums.Element.WATER
		"LIGHT":
			return card_element == Enums.Element.LIGHT
		"DARK":
			return card_element == Enums.Element.DARK

	return false


func _matches_job(card, job: String) -> bool:
	if not card or not card.card_data:
		return false

	var card_job = card.card_data.get("job", "")
	if card_job is String:
		return card_job.to_lower() == job.to_lower()

	return false


func _matches_category(card, category: String) -> bool:
	if not card or not card.card_data:
		return false

	var card_categories = card.card_data.get("categories", [])
	if card_categories is Array:
		for cat in card_categories:
			if cat is String and cat.to_lower() == category.to_lower():
				return true

	return false


# =============================================================================
# GAME STATE ACCESSORS
# These abstract away the game state interface for flexibility
# =============================================================================

func _get_field_cards(game_state, player: int) -> Array:
	if game_state.has_method("get_field_cards"):
		return game_state.get_field_cards(player)
	elif game_state.has_method("get_player_field"):
		return game_state.get_player_field(player)
	elif "players" in game_state and player < game_state.players.size():
		var p = game_state.players[player]
		if "field" in p:
			return p.field
	return []


func _get_player_damage(game_state, player: int) -> int:
	if game_state.has_method("get_player_damage"):
		return game_state.get_player_damage(player)
	elif "players" in game_state and player < game_state.players.size():
		var p = game_state.players[player]
		if "damage" in p:
			return p.damage
	return 0


func _get_break_zone(game_state, player: int) -> Array:
	if game_state.has_method("get_break_zone"):
		return game_state.get_break_zone(player)
	elif "players" in game_state and player < game_state.players.size():
		var p = game_state.players[player]
		if "break_zone" in p:
			return p.break_zone
	return []


func _get_hand(game_state, player: int) -> Array:
	if game_state.has_method("get_hand"):
		return game_state.get_hand(player)
	elif "players" in game_state and player < game_state.players.size():
		var p = game_state.players[player]
		if "hand" in p:
			return p.hand
	return []


func _get_deck(game_state, player: int) -> Array:
	if game_state.has_method("get_deck"):
		return game_state.get_deck(player)
	elif "players" in game_state and player < game_state.players.size():
		var p = game_state.players[player]
		if "deck" in p:
			return p.deck
	return []


func _get_removed_zone(game_state, player: int) -> Array:
	if game_state.has_method("get_removed_zone"):
		return game_state.get_removed_zone(player)
	elif "players" in game_state and player < game_state.players.size():
		var p = game_state.players[player]
		if "removed_zone" in p:
			return p.removed_zone
	return []