class_name ToastManager

# ============================================================================
# ToastManager.gd - Toast消息管理器
# ============================================================================
# 负责创建和管理Toast消息的显示
# 
# 核心功能:
# - 创建Toast消息实例
# - 管理Toast动画和生命周期
# - 支持多个Toast同时显示
# - 自动排列和清理Toast
# - 支持中文字体显示
#
# 使用方式:
#   var toast_manager = ToastManager.new()
#   toast_manager.setup(toast_container)
#   toast_manager.show_toast("消息内容", true)
#
# 注意事项:
# - 需要提供一个容器节点来承载Toast
# - 自动处理Toast的位置计算和动画
# - 支持Web平台的字体处理
# ============================================================================

extends RefCounted

# ============ 成员变量 ============

# Toast容器和管理
var toast_container: Control                    # Toast消息容器
var active_toasts: Array = []                  # 当前显示的Toast消息列表
var toast_counter: int = 0                     # Toast计数器，用于生成唯一ID

# ============ 初始化方法 ============

# 设置Toast管理器
# 
# 参数:
#   container: Control - Toast消息的容器节点
func setup(container: Control):
	toast_container = container
	print("ToastManager 初始化完成")

# ============ 公共方法 ============

# 显示Toast消息
# 
# 参数:
#   message: String - 消息内容
#   is_success: bool - 是否为成功消息（影响颜色）
func show_toast(message: String, is_success: bool = true):
	if toast_container == null:
		print("错误: toast_container 节点不存在")
		return
	
	print("显示Toast消息: ", message, " 成功: ", is_success)
	_create_toast_instance(message, is_success)

# 清理所有Toast
func clear_all_toasts():
	for toast in active_toasts:
		if is_instance_valid(toast):
			toast.queue_free()
	active_toasts.clear()

# ============ 私有方法 ============

# 创建Toast实例
func _create_toast_instance(message: String, is_success: bool):
	toast_counter += 1
	
	# Web平台字体处理
	var is_web = OS.get_name() == "Web"
	
	# 1. 创建Toast Panel（方框UI）
	var toast_panel = Panel.new()
	toast_panel.name = "Toast_" + str(toast_counter)
	
	# 设置Toast样式
	var style = StyleBoxFlat.new()
	if is_success:
		style.bg_color = Color(0.15, 0.7, 0.15, 0.95)
		style.border_color = Color(0.2, 0.9, 0.2, 0.9)
	else:
		style.bg_color = Color(0.7, 0.15, 0.15, 0.95)
		style.border_color = Color(0.9, 0.2, 0.2, 0.9)
	
	style.border_width_left = 3
	style.border_width_top = 3
	style.border_width_right = 3
	style.border_width_bottom = 3
	style.corner_radius_top_left = 12
	style.corner_radius_top_right = 12
	style.corner_radius_bottom_left = 12
	style.corner_radius_bottom_right = 12
	style.shadow_color = Color(0, 0, 0, 0.3)
	style.shadow_size = 4
	style.shadow_offset = Vector2(2, 2)
	
	toast_panel.add_theme_stylebox_override("panel", style)
	
	# 设置Toast基本尺寸
	var toast_width = 320
	toast_panel.size = Vector2(toast_width, 60)
	
	# 2. 创建VBoxContainer
	var vbox = VBoxContainer.new()
	vbox.add_theme_constant_override("separation", 0)
	vbox.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	vbox.alignment = BoxContainer.ALIGNMENT_CENTER
	
	# 3. 创建CenterContainer
	var center_container = CenterContainer.new()
	center_container.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	center_container.size_flags_vertical = Control.SIZE_SHRINK_CENTER
	
	# 4. 创建Label（文字控件）
	var text_label = Label.new()
	text_label.text = message
	text_label.add_theme_color_override("font_color", Color(1, 1, 1, 1))
	text_label.add_theme_font_size_override("font_size", 14)
	
	# 平台特定的字体处理
	if is_web:
		print("Web平台Toast字体处理")
		# Web平台使用主题文件
		var chinese_theme = load("res://assets/ui/chinese_theme.tres")
		if chinese_theme:
			text_label.theme = chinese_theme
			print("Web平台应用中文主题")
		else:
			print("Web平台中文主题加载失败")
	else:
		print("桌面平台Toast字体处理")
		# 桌面平台直接加载中文字体
		var desktop_chinese_font = load("res://assets/fonts/msyh.ttc")
		if desktop_chinese_font:
			text_label.add_theme_font_override("font", desktop_chinese_font)
			print("桌面平台使用中文字体")
	
	text_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	text_label.custom_minimum_size = Vector2(280, 0)
	text_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	text_label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
	
	# 组装控件层级
	center_container.add_child(text_label)
	vbox.add_child(center_container)
	toast_panel.add_child(vbox)
	
	# 计算位置
	var margin = 20
	var start_x = toast_container.get_viewport().get_visible_rect().size.x
	var final_x = toast_container.get_viewport().get_visible_rect().size.x - toast_width - margin
	
	# 计算Y位置
	var y_position = margin
	for existing_toast in active_toasts:
		if is_instance_valid(existing_toast):
			y_position += existing_toast.size.y + 15
	
	# 设置初始位置
	toast_panel.position = Vector2(start_x, y_position)
	
	# 添加到容器
	toast_container.add_child(toast_panel)
	active_toasts.append(toast_panel)
	
	# 等待一帧让布局系统计算尺寸
	await toast_container.get_tree().process_frame
	
	# 让Toast高度自适应内容
	var content_size = vbox.get_combined_minimum_size()
	var final_height = max(60, content_size.y + 20)  # 最小60，加20像素边距
	toast_panel.size.y = final_height
	
	# 重新排列所有Toast
	_rearrange_toasts()
	
	# 开始动画
	_animate_toast_in(toast_panel, final_x)

# Toast入场动画
func _animate_toast_in(toast_panel: Panel, final_x: float):
	var tween = toast_container.create_tween()
	tween.set_ease(Tween.EASE_OUT)
	tween.set_trans(Tween.TRANS_BACK)
	
	tween.parallel().tween_property(toast_panel, "position:x", final_x, 0.6)
	tween.parallel().tween_property(toast_panel, "modulate:a", 1.0, 0.4)
	
	toast_panel.modulate.a = 0.0
	
	# 等待3秒后开始退场动画
	await toast_container.get_tree().create_timer(3.0).timeout
	_animate_toast_out(toast_panel)

# Toast退场动画
func _animate_toast_out(toast_panel: Panel):
	if not is_instance_valid(toast_panel):
		return
	
	var tween = toast_container.create_tween()
	tween.set_ease(Tween.EASE_IN)
	tween.set_trans(Tween.TRANS_QUART)
	
	var end_x = toast_container.get_viewport().get_visible_rect().size.x + 50
	tween.parallel().tween_property(toast_panel, "position:x", end_x, 0.4)
	tween.parallel().tween_property(toast_panel, "modulate:a", 0.0, 0.3)
	
	await tween.finished
	_cleanup_toast(toast_panel)

# 清理Toast
func _cleanup_toast(toast_panel: Panel):
	if not is_instance_valid(toast_panel):
		return
	
	active_toasts.erase(toast_panel)
	_rearrange_toasts()
	toast_panel.queue_free()

# 重新排列Toast位置
func _rearrange_toasts():
	var margin = 20
	var current_y = margin
	
	for i in range(active_toasts.size()):
		var toast = active_toasts[i]
		if is_instance_valid(toast):
			var tween = toast_container.create_tween()
			tween.tween_property(toast, "position:y", current_y, 0.2)
			current_y += toast.size.y + 15