extends CharacterBody2D

# 信号定义
signal player_moved(position: Vector2)

# 常量定义
const MOVE_SPEED = 200.0

# 节点引用
@onready var animation_player: AnimationPlayer = $AnimationPlayer
@onready var sprite: Sprite2D = $Sprite2D

var last_direction := "down"

func _ready() -> void:
	# 检查是否有初始位置设置
	call_deferred("_check_spawn_position")
	
	# 播放初始动画
	if animation_player.has_animation("idle"):
		animation_player.play("idle")
	
func _check_spawn_position() -> void:
	var spawn_pos = SceneManager.get_next_scene_position()
	if spawn_pos != null:
		global_position = spawn_pos

func _physics_process(delta: float) -> void:
	_handle_movement(delta)

func _handle_movement(_delta: float) -> void:
	# 获取移动向量 (参考 docs/02-开发规范/输入映射配置.md)
	var direction := Input.get_vector(
		"move_left", "move_right", 
		"move_up", "move_down"
	)
	
	# 应用移动
	if direction != Vector2.ZERO:
		velocity = direction * MOVE_SPEED
		_update_animation_state(direction)
	else:
		velocity = Vector2.ZERO
		_play_idle_animation()
	
	move_and_slide()
	
	# 发送移动事件 (如果位置发生明显变化)
	if velocity.length() > 0:
		EventSystem.emit_event(EventNames.PLAYER_MOVED, {
			"position": global_position
		})

func _update_animation_state(direction: Vector2) -> void:
	if not animation_player:
		return

	# Determine primary direction
	if abs(direction.x) > abs(direction.y):
		if direction.x > 0:
			last_direction = "right"
		else:
			last_direction = "left"
	else:
		if direction.y > 0:
			last_direction = "down"
		else:
			last_direction = "up"
	
	animation_player.play("walk_" + last_direction)

func _play_idle_animation() -> void:
	if animation_player:
		animation_player.play("idle_" + last_direction)