@tool
class_name StateDrapSlot
extends Control

@onready var drop_area: StateDropArea = %DropArea
@onready var state_label: Label = %StateLabel

@onready var context: RichTextLabel = %Context

@onready var cb_use_trans: CheckBox = %CB_UseTrans
@onready var clear_button: Button = %ClearButton

@onready var index: Label = %Index

var _cached_single_act: SingleAct = null
var _cached_prop_id: int = -1
var _cached_info: Dictionary

var _state: int = 0

const NORMAL_STATE_LABLE: String = "Drag state node to icon."
const NORMAL_CONTEXT: String = "Information will be show here."

#const ICON_COLOR: Dictionary = {
	#"Idle": Color.GRAY,
	#""
#}
const COLOR_IDLE: Color = Color.GRAY
const COLOR_CHECKED_1: Color = Color.GREEN
const COLOR_CHECKED_2: Color = Color.YELLOW
const COLOR_CHECKED_3: Color = Color.ORANGE_RED


func _ready() -> void:
	_reset_to_default()
	_reset_cb_use_trans()
	
	if drop_area:
		drop_area.node_path_dropped.connect(_on_node_path_dropped)
		drop_area.state_change.connect(_on_drap_area_state_change)

## 核心函數，通過狀態機來控制UI組件的狀態。
func _set_state(new_state: int) -> void:
	if _state == new_state:
		return

	_state = new_state

	match _state:
		0: ## 初始狀態，什麽都沒有
			pass
		1: ## vaild 狀態，可以插入了
			pass

func _btn_init() -> void:
	clear_button.pressed.connect(_on_clear_pressed)

func _on_clear_pressed() -> void:
	_clear_cached_act()

func init(index: int) -> void:
	self.index.text = str(index)

func _on_node_path_dropped(path: NodePath) -> void:
	
	## 如果已經可以插入但是重新被插入了一個State，先clear再插入。
	if get_ready_to_insert():
		_clear_cached_act()
	
	var state := StateResolveUtils.get_state_node_from_path(path)
	if state == null:
		_clear_cached_act()
		_reset_to_default()
		return

	var info := StateResolveUtils.resolve_state_display_info(state)
	if info == null:
		_clear_cached_act()
		_reset_to_default()
		return
	
	##缓存一遍有效的info
	_cached_info = info
	
	# 创建 / 更新 cached
	_cached_single_act = SingleAct.new()
	_cached_single_act.state_id = state.state_id
	_cached_single_act.use_trans = cb_use_trans.button_pressed
	_cached_single_act.context = {}

	_cached_prop_id = int(info.prop_id)

	_update_context(info)
	
	drop_area.vaild = true

func _on_drap_area_state_change(state:int) -> void:
	pass

func _on_use_trans_toggled(pressed: bool) -> void:
	# 如果存在就改，不存在無事發生
	if _cached_single_act:
		_cached_single_act.use_trans = pressed
	
	_update_context()

func _resolve_state_from_path(path: NodePath) -> ReedPropState:
	var root := EditorInterface.get_edited_scene_root()
	if root == null:
		return null

	var node := root.get_node_or_null(path)
	if node is ReedPropState:
		return node

	return null

## 重置回默认
func _reset_to_default() ->void:
	state_label.text = NORMAL_STATE_LABLE
	state_label.modulate = COLOR_IDLE
	
	context.text = NORMAL_CONTEXT
	context.modulate = COLOR_IDLE


## 初始化use trans 的 check box
func _reset_cb_use_trans() ->void:
	cb_use_trans.button_pressed = false

	if not cb_use_trans.toggled.is_connected(_on_use_trans_toggled):
		cb_use_trans.toggled.connect(_on_use_trans_toggled)


## 创建一个CachedAct
func _build_cached_act(state: ReedPropState, info: Dictionary) -> void:
	if _cached_single_act == null:
		_cached_single_act = SingleAct.new()

	_cached_single_act.state_id = state.state_id
	_cached_single_act.use_trans = false  # 默认值，可后续切换
	_cached_single_act.context = {}        # 预留

	# Prop ID 缓存
	_cached_prop_id = int(info.prop_id)

## 清空Cached Act
func _clear_cached_act() -> void:
	_cached_single_act = null
	_cached_prop_id = -1
	_cached_info = {}
	
	drop_area.vaild = false
	_update_context()

## 设置文本
func _update_context(info:Dictionary = {}) ->void:
	## 如果没有传入有效的info且没有cached过act，则直接返回
	## TODO:这里后续应该有一个报错的Message
	if info == {} :
		if _cached_info == {}:
			return
		else:
			info = _cached_info
	
	context.clear()
	
	# —— 配置颜色变量 —— #
	var prop_color_str  := COLOR_CHECKED_1.to_html(false)
	var state_color_str := COLOR_CHECKED_1.to_html(false)
	var id_color_str    := COLOR_CHECKED_2.to_html(false)
	
	var use_trans := _cached_single_act.use_trans
	var use_mark := "\u2714" if use_trans else "\u2716"
	var use_mark_color_str := (
		COLOR_CHECKED_1 if use_trans else COLOR_CHECKED_3
	).to_html(false)

	var bbcode := ""
	bbcode += "[table=1][cell]"

	# Prop
	bbcode += "[b][color=%s]%s[/color][/b] [color=%s](ID_%s)[/color]" % [
		prop_color_str,
		info.prop_name,
		id_color_str,
		info.prop_id
	]

	# 空白占位
	bbcode += "[color=#00000000]       [/color]"

	# State
	bbcode += "[b][color=%s]%s[/color][/b] [color=%s](ID_%s)[/color]" % [
		state_color_str,
		info.state_name,
		id_color_str,
		info.state_id
	]

	# 再空白
	bbcode += "[color=#00000000]       [/color]"

	# Use Trans 显示
	bbcode += "[color=%s]%s[/color] Use Trans" % [
		use_mark_color_str,
		use_mark
	]

	bbcode += "[/cell][/table]"

	context.text = bbcode


## 外部調用，可以返回當前的Slot是否有效，懶檢查
func get_ready_to_insert() -> bool:
	return (
		_cached_single_act != null
		and _cached_prop_id >= 0
		and _cached_info != null
		and _cached_info != {}
	)