extends PanelContainer

# ============================================================================
# ChatMessage.gd - 聊天消息气泡组件
# ============================================================================
# 显示单条聊天消息的 UI 组件
#
# 核心职责:
# - 显示消息发送者、内容、时间戳
# - 区分自己和他人的消息样式
# - 自动格式化时间戳
#
# 使用方式:
#   var message := chat_message_scene.instantiate()
#   message.set_message("PlayerName", "Hello!", timestamp, false)
#
# 注意事项:
# - 使用 @onready 缓存节点引用
# - 最大宽度限制为 400 像素
# ============================================================================

class_name ChatMessage

# ============================================================================
# 导出参数
# ============================================================================

# 最大宽度（像素）
@export var max_width: int = 400

const MIN_BUBBLE_TEXT_WIDTH: float = 86.0
const BUBBLE_HORIZONTAL_MARGIN: float = 28.0
const HEADER_GAP_WIDTH: float = 8.0
const AVATAR_SIZE: float = 40.0
const AVATAR_CORNER_RADIUS: int = 12

# ============================================================================
# 节点引用
# ============================================================================

# 用户名标签
var username_label: Label

# 时间戳标签
var timestamp_label: Label

# 内容标签
var content_label: RichTextLabel

# 用户信息容器
var user_info_container: HBoxContainer

# 头像节点
var left_avatar_panel: PanelContainer
var right_avatar_panel: PanelContainer
var left_avatar_label: Label
var right_avatar_label: Label
var message_row: HBoxContainer
var bubble_panel: PanelContainer
var text_container: VBoxContainer

# ============================================================================
# 生命周期方法
# ============================================================================

func _ready() -> void:
	_cache_node_refs()

func _cache_node_refs() -> void:
	if not username_label:
		username_label = get_node_or_null("MessageRow/BubblePanel/TextContainer/HeaderRow/UsernameLabel")
	if not timestamp_label:
		timestamp_label = get_node_or_null("MessageRow/BubblePanel/TextContainer/HeaderRow/TimestampLabel")
	if not content_label:
		content_label = get_node_or_null("MessageRow/BubblePanel/TextContainer/ContentLabel")
	if not user_info_container:
		user_info_container = get_node_or_null("MessageRow/BubblePanel/TextContainer/HeaderRow")
	if not left_avatar_panel:
		left_avatar_panel = get_node_or_null("MessageRow/LeftAvatarPanel")
	if not right_avatar_panel:
		right_avatar_panel = get_node_or_null("MessageRow/RightAvatarPanel")
	if not left_avatar_label:
		left_avatar_label = get_node_or_null("MessageRow/LeftAvatarPanel/AvatarLabel")
	if not right_avatar_label:
		right_avatar_label = get_node_or_null("MessageRow/RightAvatarPanel/AvatarLabel")
	if not message_row:
		message_row = get_node_or_null("MessageRow")
	if not bubble_panel:
		bubble_panel = get_node_or_null("MessageRow/BubblePanel")
	if not text_container:
		text_container = get_node_or_null("MessageRow/BubblePanel/TextContainer")

	_configure_avatar(left_avatar_panel, left_avatar_label)
	_configure_avatar(right_avatar_panel, right_avatar_label)

	# 内容换行与自适应高度
	if content_label:
		content_label.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN
		content_label.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
		content_label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
		content_label.fit_content = true
		content_label.scroll_active = false

# ============================================================================
# 成员变量
# ============================================================================

# 是否为自己发送的消息
var _is_self: bool = false

# ============================================================================
# 公共 API
# ============================================================================

# 设置消息内容
#
# 参数:
#   from_user: String - 发送者用户名
#   content: String - 消息内容
#   timestamp: float - Unix 时间戳
#   is_self: bool - 是否为自己发送的消息（默认 false）
#
# 使用示例:
#   message.set_message("Alice", "Hello!", 1703500800.0, false)
func set_message(from_user: String, content: String, timestamp: float, is_self: bool = false) -> void:
	_is_self = is_self
	_cache_node_refs()

	var safe_from_user := from_user
	if safe_from_user.strip_edges().is_empty():
		safe_from_user = "我" if is_self else "玩家"

	# 设置用户名（带空值检查）
	if username_label:
		username_label.text = safe_from_user
	else:
		push_error("ChatMessage: username_label is null!")
		return

	var avatar_text := _get_avatar_text(safe_from_user, is_self)
	if left_avatar_label:
		left_avatar_label.text = avatar_text
	if right_avatar_label:
		right_avatar_label.text = avatar_text

	# 设置内容
	if content_label:
		content_label.clear()  # 清除默认文本和所有内容
		content_label.append_text(content)  # 作为纯文本追加，避免 BBCode 解析导致内容不显示
	else:
		push_error("ChatMessage: content_label is null!")
		return

	# 设置时间戳
	if timestamp_label:
		timestamp_label.text = _format_timestamp(timestamp)
	else:
		push_error("ChatMessage: timestamp_label is null!")
		return

	_update_bubble_width(safe_from_user, content)

	# 应用样式
	_apply_style()

# ============================================================================
# 内部方法 - 样式处理
# ============================================================================

	# 应用样式（自己和他人的消息不同）
func _apply_style() -> void:
	if not username_label or not timestamp_label or not user_info_container:
		return

	# 重要：设置垂直 size flags 让 Panel 适应内容高度
	size_flags_vertical = Control.SIZE_SHRINK_BEGIN
	size_flags_horizontal = Control.SIZE_EXPAND_FILL

	if _is_self:
		if message_row:
			message_row.alignment = BoxContainer.ALIGNMENT_END
		user_info_container.alignment = BoxContainer.ALIGNMENT_END
		_set_avatar_side(true)

		# 设置面板样式
		if bubble_panel:
			bubble_panel.add_theme_stylebox_override("panel", _get_self_style())
		if right_avatar_panel:
			right_avatar_panel.add_theme_stylebox_override("panel", _get_avatar_style(true))
			_apply_selected_avatar(right_avatar_panel, right_avatar_label, username_label.text)

		# 设置文字颜色 - ID使用金色 #FFD700
		username_label.add_theme_color_override("font_color", Color(0.258824, 0.627451, 0.913725))
		timestamp_label.add_theme_color_override("font_color", Color(0.560784, 0.639216, 0.733333))
		if right_avatar_label:
			right_avatar_label.add_theme_color_override("font_color", Color(1, 1, 1))
		if content_label:
			content_label.add_theme_color_override("default_color", Color(0.188, 0.294, 0.424))
	else:
		if message_row:
			message_row.alignment = BoxContainer.ALIGNMENT_BEGIN
		user_info_container.alignment = BoxContainer.ALIGNMENT_BEGIN
		_set_avatar_side(false)

		# 设置面板样式
		if bubble_panel:
			bubble_panel.add_theme_stylebox_override("panel", _get_other_style())
		if left_avatar_panel:
			left_avatar_panel.add_theme_stylebox_override("panel", _get_avatar_style(false))

		# 设置文字颜色 - ID使用蓝色 #69c0ff
		username_label.add_theme_color_override("font_color", Color(0.207843, 0.427451, 0.686275))
		timestamp_label.add_theme_color_override("font_color", Color(0.560784, 0.639216, 0.733333))
		if left_avatar_label:
			left_avatar_label.add_theme_color_override("font_color", Color(1, 1, 1))
		if content_label:
			content_label.add_theme_color_override("default_color", Color(0.27451, 0.407843, 0.541176))

func _set_avatar_side(is_self: bool) -> void:
	if left_avatar_panel:
		left_avatar_panel.visible = not is_self
	if right_avatar_panel:
		right_avatar_panel.visible = is_self

func _configure_avatar(panel: PanelContainer, label: Label) -> void:
	if panel:
		panel.custom_minimum_size = Vector2(AVATAR_SIZE, AVATAR_SIZE)
		panel.size = Vector2(AVATAR_SIZE, AVATAR_SIZE)
		panel.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN
		panel.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
		panel.clip_contents = true
	if label:
		label.custom_minimum_size = Vector2(AVATAR_SIZE, AVATAR_SIZE)
		label.size_flags_horizontal = Control.SIZE_SHRINK_BEGIN
		label.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
		label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
		label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER

func _update_bubble_width(from_user: String, content: String) -> void:
	var maxTextWidth := float(max_width) - BUBBLE_HORIZONTAL_MARGIN
	var contentWidth := _measure_label_text_width(content_label, content, 14.0)
	var headerWidth := _measure_label_text_width(username_label, from_user, 16.0) + _measure_label_text_width(timestamp_label, timestamp_label.text, 13.0) + HEADER_GAP_WIDTH
	var textWidth: float = clamp(max(contentWidth, headerWidth, MIN_BUBBLE_TEXT_WIDTH), MIN_BUBBLE_TEXT_WIDTH, maxTextWidth)

	if username_label:
		username_label.custom_minimum_size.x = min(_measure_label_text_width(username_label, from_user, 16.0), textWidth)
	if timestamp_label:
		timestamp_label.custom_minimum_size.x = _measure_label_text_width(timestamp_label, timestamp_label.text, 13.0)
	if content_label:
		content_label.custom_minimum_size.x = textWidth
	if bubble_panel:
		bubble_panel.custom_minimum_size.x = textWidth + BUBBLE_HORIZONTAL_MARGIN

func _measure_label_text_width(label: Control, text: String, fallback_width: float) -> float:
	if label != null:
		var font := label.get_theme_font("font")
		if font != null:
			var fontSize := label.get_theme_font_size("font_size")
			if fontSize <= 0:
				fontSize = int(fallback_width)
			var measured := font.get_string_size(text, HORIZONTAL_ALIGNMENT_LEFT, -1.0, fontSize).x
			if measured > 0.0:
				return measured + 2.0

	var width := 0.0
	for index in range(text.length()):
		var code := text.unicode_at(index)
		if code <= 0x7f:
			width += fallback_width * 0.58
		else:
			width += fallback_width
	return width + 2.0

# 获取自己消息的样式
func _get_self_style() -> StyleBoxFlat:
	var style := StyleBoxFlat.new()
	style.bg_color = Color(0.878431, 0.94902, 1.0, 0.96)
	style.border_width_left = 1
	style.border_width_top = 1
	style.border_width_right = 1
	style.border_width_bottom = 1
	style.border_color = Color(0.64, 0.82, 0.95, 0.78)
	style.corner_radius_top_left = 14
	style.corner_radius_top_right = 8
	style.corner_radius_bottom_left = 14
	style.corner_radius_bottom_right = 14
	style.content_margin_left = 14
	style.content_margin_right = 14
	style.content_margin_top = 9
	style.content_margin_bottom = 9
	return style

# 获取他人消息的样式
func _get_other_style() -> StyleBoxFlat:
	var style := StyleBoxFlat.new()
	style.bg_color = Color(1, 1, 1, 0.96)
	style.border_width_left = 1
	style.border_width_top = 1
	style.border_width_right = 1
	style.border_width_bottom = 1
	style.border_color = Color(0.78, 0.85, 0.92, 0.72)
	style.corner_radius_top_left = 8
	style.corner_radius_top_right = 14
	style.corner_radius_bottom_left = 14
	style.corner_radius_bottom_right = 14
	style.content_margin_left = 14
	style.content_margin_right = 14
	style.content_margin_top = 9
	style.content_margin_bottom = 9
	return style

func _get_avatar_style(is_self: bool) -> StyleBoxFlat:
	if is_self:
		var appearanceManager := get_node_or_null("/root/AppearanceManager")
		if appearanceManager != null and appearanceManager.has_method("create_avatar_style") and appearanceManager.has_method("get_selected_avatar"):
			var avatar: Variant = appearanceManager.call("get_selected_avatar")
			if avatar is Dictionary:
				return appearanceManager.call("create_avatar_style", avatar as Dictionary, AVATAR_CORNER_RADIUS)

	var style := StyleBoxFlat.new()
	style.bg_color = Color(0.361, 0.690, 0.914) if is_self else Color(0.62, 0.75, 0.86)
	style.corner_radius_top_left = AVATAR_CORNER_RADIUS
	style.corner_radius_top_right = AVATAR_CORNER_RADIUS
	style.corner_radius_bottom_left = AVATAR_CORNER_RADIUS
	style.corner_radius_bottom_right = AVATAR_CORNER_RADIUS
	style.border_width_left = 1
	style.border_width_top = 1
	style.border_width_right = 1
	style.border_width_bottom = 1
	style.border_color = Color(1, 1, 1, 0.82)
	return style

func _get_avatar_text(from_user: String, is_self: bool) -> String:
	if is_self:
		var appearanceManager := get_node_or_null("/root/AppearanceManager")
		if appearanceManager != null and appearanceManager.has_method("has_custom_avatar") and bool(appearanceManager.call("has_custom_avatar")):
			return ""
		if appearanceManager != null and appearanceManager.has_method("get_avatar_label"):
			return str(appearanceManager.call("get_avatar_label"))
		return "我"
	var trimmed := from_user.strip_edges()
	if trimmed.is_empty():
		return "鲸"
	return trimmed.substr(0, 1)

func _apply_selected_avatar(panel: PanelContainer, label: Label, fallbackText: String) -> void:
	var appearanceManager := get_node_or_null("/root/AppearanceManager")
	if appearanceManager != null and appearanceManager.has_method("apply_avatar_to_panel"):
		appearanceManager.call("apply_avatar_to_panel", panel, label, "", fallbackText)

# ============================================================================
# 内部方法 - 工具函数
# ============================================================================

# 格式化时间戳
#
# 参数:
#   timestamp: float - Unix 时间戳
#
# 返回值:
#   String - 格式化的时间字符串
func _format_timestamp(timestamp: float) -> String:
	if timestamp == 0:
		return ""

	var datetime := Time.get_datetime_dict_from_unix_time(timestamp)

	# 格式化为 HH:MM
	return "%02d:%02d" % [datetime.hour, datetime.minute]