# ReconnectUI (P10) —— 断线遮罩 + 自动重连倒计时 + 手动重连。
#
#   var rc := preload("res://ui/reconnect_ui.gd").new()
#   add_child(rc)
#   rc.setup(m2client)
#
# `disconnected(reason)` → 显示遮罩 + "N 秒后自动重连"；到点调 client.reconnect()。
# `entered_game` 或任何非 offline 的 phase_changed → 隐藏。
# 按钮：立即重连 / 停止（不再自动）。
extends CanvasLayer

const MobileWindowHost := preload("res://ui/mobile/mobile_window_host.gd")

const AUTO_DELAY := 5.0
const MAX_TRIES := 5

var client: Node
var _panel: ColorRect
var _msg: Label
var _count: Label
var _left := 0.0
var _tries := 0
var _auto := true
var _armed := false
var _mobile_mode := false
var _box: VBoxContainer
var _last_viewport_size := Vector2.ZERO

func setup(m2client: Node) -> void:
	client = m2client
	layer = 70
	_build()
	if client.has_signal("disconnected"):
		client.disconnected.connect(_on_disconnected)
	if client.has_signal("entered_game"):
		client.entered_game.connect(func(): _dismiss())
	if client.has_signal("phase_changed"):
		client.phase_changed.connect(func(p):
			# Keep the reconnect surface visible while auth/game handshaking is in
			# progress. Hiding it on the first "login" phase left players with a
			# dead-looking world and no retry feedback on mobile.
			if not _armed and String(p).to_lower() not in ["offline", "", "close", "failed"]:
				_dismiss())
	MobileWindowHost.wire_buttons(self)
	set_process(true)

func set_mobile_mode(enabled: bool) -> void:
	_mobile_mode = enabled
	_apply_layout()

func dismiss() -> void:
	_dismiss()

func set_error(reason: String) -> void:
	if _msg:
		_msg.text = "重连失败：%s" % reason
	if _count:
		_count.text = "将自动重试"

func is_showing() -> bool:
	return _panel.visible

func _on_disconnected(reason: String) -> void:
	_msg.text = "连接断开：%s" % reason
	_panel.visible = true
	_armed = true
	_auto = true
	_tries = 0
	_left = AUTO_DELAY
	_apply_layout()

func _dismiss() -> void:
	_panel.visible = false
	_armed = false

func _retry_now() -> void:
	if client == null or not client.has_method("reconnect"):
		return
	_tries += 1
	_count.text = "重连中…（第 %d 次）" % _tries
	_left = AUTO_DELAY
	var ok: bool = client.reconnect()
	if not ok:
		_count.text = "重连失败，%0.0f 秒后再试" % AUTO_DELAY

func _process(dt: float) -> void:
	_apply_layout()
	if not _panel.visible or not _armed:
		return
	if not _auto:
		_count.text = "自动重连已停止"
		return
	if _tries >= MAX_TRIES:
		_count.text = "已重试 %d 次，仍失败" % _tries
		return
	_left -= dt
	_count.text = "%0.0f 秒后自动重连（%d/%d）" % [maxf(_left, 0.0), _tries, MAX_TRIES]
	if _left <= 0.0:
		_retry_now()

func _build() -> void:
	_panel = ColorRect.new()
	_panel.color = Color(0.05, 0.02, 0.02, 0.92)
	_panel.set_anchors_preset(Control.PRESET_FULL_RECT)
	_panel.visible = false
	add_child(_panel)
	var box := VBoxContainer.new()
	_box = box
	box.set_anchors_preset(Control.PRESET_CENTER)
	box.position = Vector2(-160, -70)
	box.custom_minimum_size = Vector2(320, 0)
	box.add_theme_constant_override("separation", 12)
	_panel.add_child(box)
	_msg = Label.new()
	_msg.text = "连接断开"
	_msg.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_msg.add_theme_font_size_override("font_size", 16)
	box.add_child(_msg)
	_count = Label.new()
	_count.text = ""
	_count.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	box.add_child(_count)
	var row := HBoxContainer.new()
	row.alignment = BoxContainer.ALIGNMENT_CENTER
	box.add_child(row)
	var now_btn := Button.new()
	now_btn.text = "立即重连"
	now_btn.custom_minimum_size = Vector2(150, 46)
	now_btn.pressed.connect(_retry_now)
	row.add_child(now_btn)
	var stop_btn := Button.new()
	stop_btn.text = "停止"
	stop_btn.custom_minimum_size = Vector2(120, 46)
	stop_btn.pressed.connect(func(): _auto = false)
	row.add_child(stop_btn)

func _apply_layout() -> void:
	if _panel == null or get_viewport() == null:
		return
	var viewport_size := get_viewport().get_visible_rect().size
	if viewport_size.is_equal_approx(_last_viewport_size) and not _mobile_mode:
		return
	_last_viewport_size = viewport_size
	if not _mobile_mode:
		return
	var area := MobileWindowHost.safe_rect(get_viewport())
	var width := minf(520.0, maxf(300.0, area.size.x - 32.0))
	_box.position = area.position + Vector2((area.size.x - width) * 0.5,
			(area.size.y - 190.0) * 0.5)
	_box.size = Vector2(width, 190.0)
	_msg.add_theme_font_size_override("font_size", 18)
	_count.add_theme_font_size_override("font_size", 15)