extends Control

static var volume: float = 100.0

var settings_panel: Panel
var difficulty_panel: Panel

func _ready() -> void:
	process_mode = Node.PROCESS_MODE_ALWAYS
	set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	_build_ui()
	_apply_volume(volume)

func _build_ui() -> void:
	var bg := ColorRect.new()
	bg.color = Color(0.06, 0.04, 0.10)
	bg.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	add_child(bg)

	var title := Label.new()
	title.text = "KickSurvivors"
	title.add_theme_font_size_override("font_size", 52)
	title.add_theme_color_override("font_color", Color.WHITE)
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	title.anchor_left = 0.5
	title.anchor_right = 0.5
	title.anchor_top = 0.0
	title.offset_left = -200
	title.offset_right = 200
	title.offset_top = 110
	add_child(title)

	var vbox := VBoxContainer.new()
	vbox.add_theme_constant_override("separation", 14)
	vbox.anchor_left = 0.5
	vbox.anchor_right = 0.5
	vbox.anchor_top = 0.5
	vbox.anchor_bottom = 0.5
	vbox.offset_left = -110
	vbox.offset_right = 110
	vbox.offset_top = -90
	vbox.offset_bottom = 90
	add_child(vbox)

	vbox.add_child(_btn("Играть", _on_play))
	vbox.add_child(_btn("Настройки", _on_settings))
	vbox.add_child(_btn("Выход", _on_exit))

	_build_settings_panel()
	_build_difficulty_panel()

func _big_btn(text: String, width: float, cb: Callable) -> Button:
	var b := _btn(text, cb)
	b.custom_minimum_size = Vector2(width, 72)
	b.add_theme_font_size_override("font_size", 18)
	return b

func _btn(text: String, cb: Callable) -> Button:
	var b := Button.new()
	b.text = text
	b.custom_minimum_size = Vector2(220, 54)
	b.add_theme_font_size_override("font_size", 20)
	for state in ["normal", "hover", "pressed", "focus", "disabled"]:
		var sb := StyleBoxFlat.new()
		sb.bg_color = Color(0.18, 0.13, 0.30) if state == "normal" else (
			Color(0.28, 0.20, 0.46) if state == "hover" else
			Color(0.12, 0.09, 0.22))
		sb.border_width_left   = 1
		sb.border_width_right  = 1
		sb.border_width_top    = 1
		sb.border_width_bottom = 1
		sb.border_color = Color(0.50, 0.38, 0.75)
		sb.corner_radius_top_left     = 6
		sb.corner_radius_top_right    = 6
		sb.corner_radius_bottom_left  = 6
		sb.corner_radius_bottom_right = 6
		sb.content_margin_left   = 20
		sb.content_margin_right  = 20
		sb.content_margin_top    = 12
		sb.content_margin_bottom = 12
		b.add_theme_stylebox_override(state, sb)
	b.connect("pressed", cb)
	return b

static func _make_opaque_panel() -> Panel:
	var p := Panel.new()
	var sb := StyleBoxFlat.new()
	sb.bg_color = Color(0.08, 0.06, 0.14)
	sb.border_width_left   = 2
	sb.border_width_right  = 2
	sb.border_width_top    = 2
	sb.border_width_bottom = 2
	sb.border_color = Color(0.35, 0.28, 0.55)
	sb.corner_radius_top_left     = 8
	sb.corner_radius_top_right    = 8
	sb.corner_radius_bottom_left  = 8
	sb.corner_radius_bottom_right = 8
	sb.content_margin_left   = 24
	sb.content_margin_right  = 24
	sb.content_margin_top    = 20
	sb.content_margin_bottom = 20
	p.add_theme_stylebox_override("panel", sb)
	return p

func _build_settings_panel() -> void:
	settings_panel = _make_opaque_panel()
	settings_panel.visible = false
	settings_panel.anchor_left   = 0.5
	settings_panel.anchor_right  = 0.5
	settings_panel.anchor_top    = 0.5
	settings_panel.anchor_bottom = 0.5
	settings_panel.offset_left   = -200
	settings_panel.offset_right  =  200
	settings_panel.offset_top    = -130
	settings_panel.offset_bottom =  130
	add_child(settings_panel)

	var vbox := VBoxContainer.new()
	vbox.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	vbox.alignment = BoxContainer.ALIGNMENT_CENTER
	vbox.add_theme_constant_override("separation", 18)
	settings_panel.add_child(vbox)

	var lbl := Label.new()
	lbl.text = "Настройки"
	lbl.add_theme_font_size_override("font_size", 26)
	lbl.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	vbox.add_child(lbl)

	var vol_lbl := Label.new()
	vol_lbl.name = "VolumeLabel"
	vol_lbl.text = "Громкость: %d" % int(volume)
	vol_lbl.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	vbox.add_child(vol_lbl)

	var slider := HSlider.new()
	slider.min_value = 0
	slider.max_value = 100
	slider.step = 1
	slider.value = volume
	slider.custom_minimum_size = Vector2(320, 32)
	slider.connect("value_changed", func(v: float) -> void:
		volume = v
		vol_lbl.text = "Громкость: %d" % int(v)
		_apply_volume(v)
	)
	vbox.add_child(slider)

	vbox.add_child(_btn("Назад", func(): settings_panel.visible = false))

func _apply_volume(v: float) -> void:
	var db := linear_to_db(v / 100.0) if v > 0.0 else -80.0
	AudioServer.set_bus_volume_db(0, db)

func _build_difficulty_panel() -> void:
	difficulty_panel = _make_opaque_panel()
	difficulty_panel.visible = false
	difficulty_panel.anchor_left   = 0.5
	difficulty_panel.anchor_right  = 0.5
	difficulty_panel.anchor_top    = 0.5
	difficulty_panel.anchor_bottom = 0.5
	difficulty_panel.offset_left   = -310
	difficulty_panel.offset_right  =  310
	difficulty_panel.offset_top    = -240
	difficulty_panel.offset_bottom =  240
	add_child(difficulty_panel)

	var margin := MarginContainer.new()
	margin.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	margin.add_theme_constant_override("margin_left",   24)
	margin.add_theme_constant_override("margin_right",  24)
	margin.add_theme_constant_override("margin_top",    20)
	margin.add_theme_constant_override("margin_bottom", 20)
	difficulty_panel.add_child(margin)

	var vbox := VBoxContainer.new()
	vbox.alignment = BoxContainer.ALIGNMENT_CENTER
	vbox.add_theme_constant_override("separation", 16)
	margin.add_child(vbox)

	var title := Label.new()
	title.text = "Выберите сложность"
	title.add_theme_font_size_override("font_size", 26)
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	vbox.add_child(title)

	vbox.add_child(_big_btn("Бессмертный\nНет урона · тир пинков от мелких врагов", 540, func() -> void:
		GameSettings.difficulty = "immortal"
		get_tree().change_scene_to_file("res://scenes/Main.tscn")
	))

	vbox.add_child(_big_btn("Выживание\nПолучаешь урон · фиксированная сила пинка", 540, func() -> void:
		GameSettings.difficulty = "survival"
		get_tree().change_scene_to_file("res://scenes/Main.tscn")
	))

	# Spawn speed row
	var spawn_lbl := Label.new()
	spawn_lbl.text = "Скорость спавна:"
	spawn_lbl.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	spawn_lbl.add_theme_font_size_override("font_size", 16)
	spawn_lbl.add_theme_color_override("font_color", Color(0.85, 0.78, 1.0))
	vbox.add_child(spawn_lbl)

	var hbox := HBoxContainer.new()
	hbox.alignment = BoxContainer.ALIGNMENT_CENTER
	hbox.add_theme_constant_override("separation", 10)
	vbox.add_child(hbox)

	var spawn_options := [
		["Медленно",  15.0, 35.0],
		["Нормально", 10.0, 20.0],
		["Быстро",     5.0,  8.0],
	]
	var spawn_btns: Array[Button] = []
	for opt in spawn_options:
		var sb_btn := _btn(opt[0] as String, Callable())
		sb_btn.custom_minimum_size = Vector2(110, 40)
		sb_btn.add_theme_font_size_override("font_size", 15)
		var enemy_iv: float = opt[1]
		var item_iv: float  = opt[2]
		sb_btn.connect("pressed", func() -> void:
			GameSettings.enemy_spawn_interval = enemy_iv
			GameSettings.item_respawn_delay   = item_iv
			for b in spawn_btns:
				b.modulate = Color(1, 1, 1)
			sb_btn.modulate = Color(0.7, 1.0, 0.5)
		)
		hbox.add_child(sb_btn)
		spawn_btns.append(sb_btn)
	# default: normal
	spawn_btns[1].modulate = Color(0.7, 1.0, 0.5)

	vbox.add_child(_btn("Назад", func(): difficulty_panel.visible = false))

func _on_play() -> void:
	difficulty_panel.visible = true

func _on_settings() -> void:
	settings_panel.visible = true

func _on_exit() -> void:
	get_tree().quit()