extends CanvasLayer
## Startmenü: Einzelspieler, Mehrspieler (Host/Client mit Lobby), Beenden.

const BOT_NAMES_MAX := 7

var screens: Dictionary = {}

# Einzelspieler
var solo_bots: SpinBox

# Mehrspieler
var name_edit: LineEdit
var ip_edit: LineEdit
var multi_bots: SpinBox
var lobby_list: Label
var status: Label
var host_btn: Button
var join_btn: Button
var start_btn: Button
var leave_btn: Button


func _ready() -> void:
	var root := Control.new()
	root.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	add_child(root)

	var bg := ColorRect.new()
	bg.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	bg.color = Color(0.05, 0.06, 0.09)
	root.add_child(bg)

	screens["main"] = _screen(root, _build_main())
	screens["single"] = _screen(root, _build_single())
	screens["multi"] = _screen(root, _build_multi())

	Net.lobby_changed.connect(_refresh)
	Net.connection_failed.connect(_on_failed)
	Net.server_closed.connect(_on_closed)
	_show("main")


# ------------------------------------------------------------ Aufbau

func _screen(root: Control, content: Control) -> CenterContainer:
	var cc := CenterContainer.new()
	cc.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	cc.add_child(content)
	root.add_child(cc)
	return cc


func _show(which: String) -> void:
	for key: String in screens:
		screens[key].visible = key == which
	if which == "multi":
		_refresh()


func _box(width: int) -> VBoxContainer:
	var v := VBoxContainer.new()
	v.custom_minimum_size = Vector2(width, 0)
	v.add_theme_constant_override("separation", 10)
	return v


func _text(t: String, size: int, col := Color.WHITE) -> Label:
	var l := Label.new()
	l.text = t
	l.add_theme_font_size_override("font_size", size)
	l.add_theme_color_override("font_color", col)
	l.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	return l


func _row(caption: String, ctrl: Control) -> HBoxContainer:
	var h := HBoxContainer.new()
	var l := Label.new()
	l.text = caption
	l.custom_minimum_size = Vector2(150, 0)
	h.add_child(l)
	ctrl.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	h.add_child(ctrl)
	return h


func _button(text: String, parent: Control, action: Callable) -> Button:
	var b := Button.new()
	b.text = text
	b.custom_minimum_size = Vector2(0, 42)
	b.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	b.pressed.connect(action)
	parent.add_child(b)
	return b


func _title(box: VBoxContainer) -> void:
	box.add_child(_text("LIAR'S DICE 3D", 40))
	box.add_child(_text("Würfeln - Bluffen - Boostern", 16, Color(0.6, 0.63, 0.7)))
	box.add_child(HSeparator.new())


func _build_main() -> Control:
	var box := _box(360)
	_title(box)
	_button("Einzelspieler", box, _show.bind("single"))
	_button("Mehrspieler", box, _show.bind("multi"))
	_button("Beenden", box, func() -> void: get_tree().quit())
	return box


func _build_single() -> Control:
	var box := _box(400)
	_title(box)
	box.add_child(_text("Einzelspieler", 22, Color(1.0, 0.82, 0.32)))
	solo_bots = SpinBox.new()
	solo_bots.min_value = 1
	solo_bots.max_value = BOT_NAMES_MAX
	solo_bots.value = 3
	box.add_child(_row("Bots", solo_bots))
	box.add_child(_text("Ohne Netzwerk - du spielst allein gegen die Bots.", 13, Color(0.55, 0.58, 0.65)))
	box.add_child(HSeparator.new())
	var row := HBoxContainer.new()
	row.add_theme_constant_override("separation", 8)
	box.add_child(row)
	_button("Starten", row, _on_solo_start)
	_button("Zurück", row, _show.bind("main"))
	return box


func _build_multi() -> Control:
	var box := _box(440)
	_title(box)
	box.add_child(_text("Mehrspieler", 22, Color(1.0, 0.82, 0.32)))

	name_edit = LineEdit.new()
	name_edit.text = "Spieler"
	name_edit.placeholder_text = "Dein Name"
	box.add_child(_row("Name", name_edit))

	ip_edit = LineEdit.new()
	ip_edit.text = "127.0.0.1"
	box.add_child(_row("Server-IP", ip_edit))

	multi_bots = SpinBox.new()
	multi_bots.min_value = 0
	multi_bots.max_value = BOT_NAMES_MAX
	multi_bots.value = 1
	box.add_child(_row("Bots (nur Host)", multi_bots))

	var brow := HBoxContainer.new()
	brow.add_theme_constant_override("separation", 8)
	box.add_child(brow)
	host_btn = _button("Spiel hosten", brow, _on_host)
	join_btn = _button("Beitreten", brow, _on_join)

	box.add_child(HSeparator.new())
	box.add_child(_text("Lobby", 18, Color(1.0, 0.82, 0.32)))
	lobby_list = _text("-", 15, Color(0.85, 0.87, 0.92))
	box.add_child(lobby_list)

	var arow := HBoxContainer.new()
	arow.add_theme_constant_override("separation", 8)
	box.add_child(arow)
	start_btn = _button("Spiel starten", arow, _on_start)
	leave_btn = _button("Trennen", arow, _on_leave)

	_button("Zurück", box, _on_back)
	status = _text("", 14, Color(0.95, 0.55, 0.5))
	box.add_child(status)
	return box


# ------------------------------------------------------------ Aktionen

func _on_solo_start() -> void:
	Net.start_singleplayer("Spieler", int(solo_bots.value))


func _on_host() -> void:
	status.text = ""
	if Net.host_game(name_edit.text.strip_edges()):
		status.text = "Server läuft auf Port %d. Warte auf Mitspieler." % Net.PORT


func _on_join() -> void:
	status.text = "Verbinde..."
	Net.join_game(ip_edit.text.strip_edges(), name_edit.text.strip_edges())


func _on_leave() -> void:
	Net.leave()
	status.text = ""


func _on_back() -> void:
	if Net.is_online():
		Net.leave()
	status.text = ""
	_show("main")


func _on_start() -> void:
	var humans: int = Net.lobby.size()
	var ai: int = mini(int(multi_bots.value), Net.MAX_HUMANS - humans)
	if humans + ai < 2:
		status.text = "Mindestens 2 Spieler nötig (Mitspieler oder Bots)."
		return
	Net.start_game(ai)


func _on_failed(msg: String) -> void:
	status.text = msg
	_refresh()


func _on_closed() -> void:
	status.text = "Server hat die Verbindung beendet."
	_refresh()


func _refresh() -> void:
	if status == null:
		return
	var connected := Net.is_online()
	host_btn.disabled = connected
	join_btn.disabled = connected
	leave_btn.disabled = not connected
	start_btn.disabled = not (connected and Net.is_host)
	multi_bots.editable = not connected or Net.is_host
	if Net.lobby.is_empty():
		lobby_list.text = "- nicht verbunden -"
	else:
		var names: Array = []
		for id: int in Net.lobby:
			names.append("%s%s" % [Net.lobby[id], " (Host)" if id == 1 else ""])
		lobby_list.text = "\n".join(names)