# FriendUI (P8) —— 好友 / 私聊名单窗（M 键）。
#
#   var fu := preload("res://ui/friend_ui.gd").new()
#   add_child(fu)
#   fu.setup(m2client, canvas_parent)
#   fu.toggle()    # M 键
#
# 每行 = 在线点 + 名字 + [删除]。底部输入框 + [添加好友]。
# `friends_changed` 刷新。双击某行 → emit `whisper_to(name)`（chat_ui 可接）。
extends Node

signal whisper_to(name: String)

var client: Node
var _root: Control
var _list: VBoxContainer
var _name_edit: LineEdit
var _invite_dialog: ConfirmationDialog
var _pending_invite := ""

func setup(m2client: Node, parent: Node) -> void:
	client = m2client
	_build(parent)
	if client.has_signal("friends_changed"):
		client.friends_changed.connect(refresh)
	if client.has_signal("friend_invite_ask"):
		client.friend_invite_ask.connect(_on_friend_invite)

func is_open() -> bool:
	return _root != null and _root.visible

func toggle() -> void:
	_root.visible = not _root.visible
	if _root.visible:
		refresh()

func refresh() -> void:
	if not is_open() or client == null:
		return
	for c in _list.get_children():
		c.queue_free()
	var friends: Array = client.get_friends()
	if friends.is_empty():
		var e := Label.new()
		e.text = "（好友列表为空）"
		e.add_theme_font_size_override("font_size", 11)
		_list.add_child(e)
		return
	for f in friends:
		_list.add_child(_row(f))

func _row(f: Dictionary) -> Control:
	var row := HBoxContainer.new()
	row.custom_minimum_size = Vector2(260, 0)
	var dot := Label.new()
	dot.text = "●"
	dot.modulate = Color(0.4, 0.9, 0.4) if f.get("online", false) else Color(0.4, 0.4, 0.4)
	row.add_child(dot)
	var nm := Button.new()
	nm.text = String(f.get("name", "?"))
	nm.flat = true
	nm.custom_minimum_size = Vector2(150, 0)
	nm.pressed.connect(func() -> void: whisper_to.emit(String(f.get("name", ""))))
	row.add_child(nm)
	if f.get("mobile", false):
		var mobile := Label.new()
		mobile.text = "手机"
		mobile.modulate = Color(0.45, 0.8, 1.0)
		mobile.add_theme_font_size_override("font_size", 10)
		row.add_child(mobile)
	var del := Button.new()
	del.text = "×"
	del.pressed.connect(func() -> void: client.remove_friend(String(f.get("name", ""))))
	row.add_child(del)
	return row

func _on_add() -> void:
	var nm := _name_edit.text.strip_edges()
	if nm != "":
		client.add_friend(nm)
		_name_edit.clear()

func _on_friend_invite(name: String) -> void:
	if client == null or name.strip_edges() == "":
		return
	_pending_invite = name
	_invite_dialog.dialog_text = "接受“%s”的好友请求？" % name
	_invite_dialog.popup_centered()

func _answer_invite(accept: bool) -> void:
	var name := _pending_invite
	_pending_invite = ""
	if name != "" and client != null and client.has_method("friend_answer"):
		client.friend_answer(name, accept)

func _build(parent: Node) -> void:
	_root = Control.new()
	_root.set_anchors_preset(Control.PRESET_CENTER)
	_root.position = Vector2(-150, -180)
	_root.size = Vector2(300, 360)
	_root.visible = false
	_root.set_meta("is_titlebar", true)
	parent.add_child(_root)
	var panel := Panel.new()
	panel.set_anchors_preset(Control.PRESET_FULL_RECT)
	var sb := StyleBoxFlat.new()
	sb.bg_color = Color(0.07, 0.08, 0.1, 0.96)
	sb.set_corner_radius_all(4)
	panel.add_theme_stylebox_override("panel", sb)
	_root.add_child(panel)
	var title := Label.new()
	title.text = "好友"
	title.position = Vector2(12, 8)
	_root.add_child(title)
	_list = VBoxContainer.new()
	_list.position = Vector2(12, 34)
	_list.add_theme_constant_override("separation", 3)
	_root.add_child(_list)
	var bottom := HBoxContainer.new()
	bottom.position = Vector2(12, 320)
	bottom.custom_minimum_size = Vector2(276, 0)
	_root.add_child(bottom)
	_name_edit = LineEdit.new()
	_name_edit.placeholder_text = "角色名"
	_name_edit.custom_minimum_size = Vector2(190, 0)
	bottom.add_child(_name_edit)
	var add_btn := Button.new()
	add_btn.text = "添加"
	add_btn.pressed.connect(_on_add)
	bottom.add_child(add_btn)
	_invite_dialog = ConfirmationDialog.new()
	_invite_dialog.title = "好友请求"
	_invite_dialog.ok_button_text = "接受"
	_invite_dialog.cancel_button_text = "拒绝"
	_invite_dialog.confirmed.connect(func() -> void: _answer_invite(true))
	_invite_dialog.canceled.connect(func() -> void: _answer_invite(false))
	# Keep the dialog outside the toggleable friend panel: requests must still
	# be visible when the friend list window itself is closed.
	parent.add_child(_invite_dialog)