class_name AIController
extends Node

## AIController - Coordinates AI player turns
## Handles timing, action execution, and phase transitions

signal ai_action_started
signal ai_action_completed
signal ai_thinking(player_index: int)

var strategy: AIStrategy
var game_state: GameState
var player_index: int
var is_processing: bool = false

# Reference to GameManager for executing actions
var _game_manager: Node


func _init() -> void:
	pass


func setup(p_player_index: int, difficulty: AIStrategy.Difficulty, p_game_manager: Node) -> void:
	player_index = p_player_index
	_game_manager = p_game_manager

	# Create appropriate strategy based on difficulty
	match difficulty:
		AIStrategy.Difficulty.EASY:
			strategy = EasyAI.new(player_index)
		AIStrategy.Difficulty.NORMAL:
			strategy = NormalAI.new(player_index)
		AIStrategy.Difficulty.HARD:
			strategy = HardAI.new(player_index)


func set_game_state(state: GameState) -> void:
	game_state = state
	if strategy:
		strategy.set_game_state(state)


## Called when it's the AI's turn to act in the current phase
func process_turn() -> void:
	if is_processing:
		return

	is_processing = true
	ai_thinking.emit(player_index)

	# Add thinking delay
	var delay := strategy.get_thinking_delay()
	await get_tree().create_timer(delay).timeout

	var phase := game_state.turn_manager.current_phase

	match phase:
		Enums.TurnPhase.ACTIVE:
			# Active phase is automatic - no AI decision needed
			_pass_priority()

		Enums.TurnPhase.DRAW:
			# Draw phase is automatic
			_pass_priority()

		Enums.TurnPhase.MAIN_1, Enums.TurnPhase.MAIN_2:
			await _process_main_phase()

		Enums.TurnPhase.ATTACK:
			await _process_attack_phase()

		Enums.TurnPhase.END:
			# End phase is automatic
			_pass_priority()

	is_processing = false
	ai_action_completed.emit()


## Process main phase - play cards or pass
func _process_main_phase() -> void:
	var max_actions := 10  # Prevent infinite loops
	var actions_taken := 0

	while actions_taken < max_actions:
		var decision := strategy.decide_main_phase_action()

		if decision.action == "pass":
			_pass_priority()
			break

		elif decision.action == "play":
			var card: CardInstance = decision.card
			var success := await _try_play_card(card)

			if not success:
				# Couldn't play - pass
				_pass_priority()
				break

			# Small delay between actions
			await get_tree().create_timer(0.3).timeout

		actions_taken += 1


## Try to play a card, handling CP generation if needed
func _try_play_card(card: CardInstance) -> bool:
	var player := game_state.get_player(player_index)
	var cost := card.card_data.cost

	# Check if we have enough CP
	var current_cp := player.cp_pool.get_total_cp()

	if current_cp < cost:
		# Need to generate CP
		var needed := cost - current_cp
		var success := await _generate_cp(needed, card.card_data.elements)
		if not success:
			return false

	# Try to play the card
	return _game_manager.try_play_card(card)


## Generate CP by dulling backups or discarding cards
func _generate_cp(needed: int, elements: Array) -> bool:
	var generated := 0
	var max_attempts := 20

	while generated < needed and max_attempts > 0:
		var decision := strategy.decide_cp_generation({ "needed": needed - generated, "elements": elements })

		if decision.is_empty():
			return false

		if decision.action == "dull_backup":
			var backup: CardInstance = decision.card
			if _game_manager.dull_backup_for_cp(backup):
				generated += 1
				await get_tree().create_timer(0.2).timeout

		elif decision.action == "discard":
			var discard_card: CardInstance = decision.card
			if _game_manager.discard_card_for_cp(discard_card):
				generated += 2
				await get_tree().create_timer(0.2).timeout

		max_attempts -= 1

	return generated >= needed


## Process attack phase - declare attacks
func _process_attack_phase() -> void:
	var attack_step := game_state.turn_manager.attack_step

	match attack_step:
		Enums.AttackStep.PREPARATION, Enums.AttackStep.DECLARATION:
			await _process_attack_declaration()

		Enums.AttackStep.BLOCK_DECLARATION:
			# This shouldn't happen - AI blocks are handled in opponent's turn
			_pass_priority()

		Enums.AttackStep.DAMAGE_RESOLUTION:
			# Automatic
			_pass_priority()


## Declare attacks with forwards
func _process_attack_declaration() -> void:
	var max_attacks := 5
	var attacks_made := 0

	while attacks_made < max_attacks:
		var decision := strategy.decide_attack_action()

		if decision.action == "end_attacks":
			# End attack phase
			_game_manager.pass_priority()
			break

		elif decision.action == "attack":
			var attacker: CardInstance = decision.card
			var success := _game_manager.declare_attack(attacker)

			if success:
				attacks_made += 1
				# Wait for block decision or damage resolution
				await get_tree().create_timer(0.5).timeout
			else:
				# Couldn't attack - end attacks
				_game_manager.pass_priority()
				break


## Called when AI needs to decide on blocking
func process_block_decision(attacker: CardInstance) -> void:
	if is_processing:
		return

	is_processing = true
	ai_thinking.emit(player_index)

	var delay := strategy.get_thinking_delay()
	await get_tree().create_timer(delay).timeout

	var decision := strategy.decide_block_action(attacker)

	if decision.action == "block":
		var blocker: CardInstance = decision.card
		_game_manager.declare_block(blocker)
	else:
		_game_manager.skip_block()

	is_processing = false
	ai_action_completed.emit()


func _pass_priority() -> void:
	_game_manager.pass_priority()