extends Sprite2D

# answer for the puzzle, by columns
@export var current_answer := [0, 0, 0, 0, 0, 0, 0, 0, 0]
@export_enum("closed", "opened", "playing", "finished") var mode := "closed"

@export var answer := [1, 0, 0, 0, 0, 0, 0, 0, 0]
# @export var answer := [1, 4, 3, 1, 3, 6, 4, 3, 2]

@onready var points_polygon = $ButtonPositionPoints as Polygon2D
@onready var box = $Box as Sprite2D
@onready var side_handle = $SideHandle as AnimatedSprite2D
@onready var inside_handle = $Handle as TextureButton
@onready var audio_player = $MusicPlayer2D as AudioStreamPlayer2D

var button_texture = preload("res://asset/art/little_game/八音盒/小猫.png")
var button_highlight_texture = preload("res://asset/art/little_game/八音盒/小猫高亮.png")

var box_closed_texture = preload("res://asset/art/little_game/八音盒/无按钮.png")
var box_opened_texture = preload("res://asset/art/little_game/八音盒/打开盒子.png")
var box_finished_texture = preload("res://asset/art/little_game/八音盒/有按钮.png")

var sfx_interact = preload("res://asset/audio/sfx/game/八音盒/八音盒互动.mp3") as AudioStream
var sfx_drag = preload("res://asset/audio/sfx/game/八音盒/拖动放置.mp3") as AudioStream
var sfx_open = preload("res://asset/audio/sfx/game/八音盒/八音盒打开.mp3") as AudioStream
var sfx_close = preload("res://asset/audio/sfx/game/八音盒/关盖子.mp3") as AudioStream
var sfx_exit = preload("res://asset/audio/sfx/game/八音盒/退出界面.mp3") as AudioStream

var audio_manual = preload("res://asset/audio/sfx/game/八音盒/操纵八音盒.mp3") as AudioStream
var audio_auto = preload("res://asset/audio/sfx/game/八音盒/自走八音盒.mp3") as AudioStream

var dragging = false

var current_selected_btn := 0:
	set(value):
		if has_node("button_root"):
			# set previous button to normal
			var root = get_node("button_root")
			root.get_node(str(current_selected_btn)).texture = button_texture
			# set current button to highlight
			root.get_node(str(value)).texture = button_highlight_texture
		current_selected_btn = value


func _ready() -> void:
	_chechout_mode()
	inside_handle.pressed.connect(_on_handle_pressed)


func _chechout_mode(play_sfx := false) -> void:
	$Handle.visible = mode == "opened"
	$SideHandle.visible = mode == "playing" or mode == "finished"
	_reset_buttons()
	match mode:
		"closed":
			audio_player.stream = sfx_interact
			audio_player.play()
			box.texture = box_closed_texture
			_reset_buttons()
			audio_player.stream = sfx_drag
		"opened":
			if play_sfx:
				audio_player.stream = sfx_open
				audio_player.play()
			box.texture = box_opened_texture
		"playing":
			audio_player.stream = sfx_drag
			box.texture = box_opened_texture
		"finished":
			if play_sfx:
				audio_player.stream = sfx_close
				audio_player.play()
			box.texture = box_finished_texture


func _reset_buttons():
	if mode != "closed":
		if has_node("button_root"):
			get_node("button_root").visible = false
		return
	# create buttons if not exists
	if not has_node("button_root"):
		var root = Node2D.new()
		root.name = "button_root"
		add_child(root)
		for i in range(9):
			var button = Sprite2D.new()
			button.name = str(i)
			root.add_child(button)
	# reset buttons' position and texture
	for i in range(9):
		var button = get_node("button_root" + "/" + str(i))
		if i == current_selected_btn:
			button.texture = button_highlight_texture
		else:
			button.texture = button_texture
		# load current_answer
		button.position = _get_position(i, current_answer[i])


# 自动计算的位置会有偏差，使用 polygon 的点进行标记
# row rom bottom to top, 7 rows in total
# col from left to right, 9 cols in total
func _get_position(col: int, row: int) -> Vector2:
	# var col_gap = col_gap_down + (col_gap_up - col_gap_down) * row / 6
	# return Vector2(origin_position.x + col_gap * col, origin_position.y - row_gap * row)
	var index = col + row * 9
	if points_polygon.polygon and index < points_polygon.polygon.size():
		return points_polygon.polygon[index]
	else:
		return Vector2(0, 0)


# 1 up 2 down
func _move_button(delta: int) -> void:
	if mode != "closed":
		return
	var current_row = current_answer[current_selected_btn]
	var target_row = clampi(current_answer[current_selected_btn] + delta, 0, 6)
	current_answer[current_selected_btn] = target_row
	# tween if not in correct position
	if current_row != target_row:
		var target_position = _get_position(current_selected_btn, target_row)
		var node = get_node("button_root/" + str(current_selected_btn))
		create_tween().tween_property(node, "position", target_position, .5)
		# play sfx
		audio_player.stream = sfx_drag
		audio_player.play()
	# check if all buttons are in correct position
	if current_answer == answer:
		mode = "opened"
		_chechout_mode(true)


func _unhandled_input(event: InputEvent) -> void:
	if mode == "closed":
		# move button
		if event.is_action_pressed("up"):
			_move_button(1)
		elif event.is_action_pressed("down"):
			_move_button(-1)
		elif event.is_action_pressed("left"):
			current_selected_btn = clampi(current_selected_btn - 1, 0, 8)
		elif event.is_action_pressed("right"):
			current_selected_btn = clampi(current_selected_btn + 1, 0, 8)


func _on_handle_pressed() -> void:
	if mode == "opened":
		mode = "playing"
		_chechout_mode(true)