extends Control

## #528: Audio settings dialog — 5-bus volume sliders.
## Opens on OPEN_MENU (ESC) from main.gd. Closes on OPEN_MENU again or CLOSE button.
## Volumes persist via AudioManager._save_prefs() on each slider change.

const BG_COLOR := Color(0.05, 0.05, 0.08, 0.90)
const BORDER_COLOR := Color("#4a9ebb")
const TEXT_COLOR := Color(0.878, 0.969, 0.98, 1)
const TITLE_COLOR := Color("#4a9ebb")
const FONT_SIZE := 14

const BOX_WIDTH := 460
const BOX_HEIGHT := 340
const PADDING := 20
const ROW_HEIGHT := 36

# Bus display labels → bus name strings (must match AudioManager BUS_* constants)
const BUS_ROWS: Array = [
	["Music",          "Music"],
	["Ambient",        "Ambient"],
	["World SFX",      "WorldSFX"],
	["Player Actions", "PlayerActions"],
	["UI Sounds",      "UISounds"],
]

var _active: bool = false
var _container: VBoxContainer = null

signal closed


func _ready() -> void:
	visible = false
	mouse_filter = Control.MOUSE_FILTER_STOP


func open() -> void:
	if _active:
		return
	_active = true
	visible = true
	_build_ui()
	queue_redraw()


func close() -> void:
	if not _active:
		return
	_active = false
	visible = false
	_destroy_ui()
	queue_redraw()
	closed.emit()


func is_open() -> bool:
	return _active


func _build_ui() -> void:
	var vp_size := get_viewport_rect().size
	var box_pos := Vector2(
		(vp_size.x - BOX_WIDTH) / 2.0,
		(vp_size.y - BOX_HEIGHT) / 2.0
	)

	_container = VBoxContainer.new()
	_container.position = box_pos + Vector2(PADDING, PADDING + 28)
	_container.custom_minimum_size = Vector2(BOX_WIDTH - PADDING * 2, 0)
	_container.add_theme_constant_override("separation", 4)
	add_child(_container)

	for row_data in BUS_ROWS:
		var label_text: String = row_data[0]
		var bus_name: String = row_data[1]

		var hbox := HBoxContainer.new()
		hbox.custom_minimum_size = Vector2(0, ROW_HEIGHT)
		_container.add_child(hbox)

		var label := Label.new()
		label.text = label_text
		label.custom_minimum_size = Vector2(150, 0)
		label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
		label.add_theme_font_size_override("font_size", FONT_SIZE)
		label.add_theme_color_override("font_color", TEXT_COLOR)
		hbox.add_child(label)

		var slider := HSlider.new()
		slider.min_value = -40.0
		slider.max_value = 0.0
		slider.step = 0.5
		slider.value = AudioManager.get_volume(bus_name)
		slider.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		hbox.add_child(slider)

		var db_label := Label.new()
		db_label.text = _format_db(slider.value)
		db_label.custom_minimum_size = Vector2(70, 0)
		db_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_RIGHT
		db_label.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
		db_label.add_theme_font_size_override("font_size", FONT_SIZE)
		db_label.add_theme_color_override("font_color", TEXT_COLOR)
		hbox.add_child(db_label)

		slider.value_changed.connect(func(value: float) -> void:
			AudioManager.set_volume(bus_name, value)
			db_label.text = _format_db(value)
		)

	# Spacer
	var spacer := Control.new()
	spacer.custom_minimum_size = Vector2(0, 8)
	_container.add_child(spacer)

	# Close button
	var close_btn := Button.new()
	close_btn.text = "CLOSE"
	close_btn.add_theme_font_size_override("font_size", FONT_SIZE)
	close_btn.pressed.connect(close)
	_container.add_child(close_btn)

	# Quit to Menu button (#258: D-085 session management)
	var quit_btn := Button.new()
	quit_btn.text = UIStrings.get_text("menu.quit_to_menu")
	quit_btn.add_theme_font_size_override("font_size", FONT_SIZE)
	quit_btn.add_theme_color_override("font_color", Color("#c87040"))
	quit_btn.pressed.connect(_on_quit_to_menu)
	_container.add_child(quit_btn)


func _destroy_ui() -> void:
	if _container:
		_container.queue_free()
		_container = null


func _draw() -> void:
	if not _active:
		return
	var viewport_size := get_viewport_rect().size

	# Dim overlay
	draw_rect(Rect2(Vector2.ZERO, viewport_size), BG_COLOR)

	# Dialog box
	var box_pos := Vector2(
		(viewport_size.x - BOX_WIDTH) / 2.0,
		(viewport_size.y - BOX_HEIGHT) / 2.0
	)
	var box_rect := Rect2(box_pos, Vector2(BOX_WIDTH, BOX_HEIGHT))
	draw_rect(box_rect, Color(0.08, 0.08, 0.12, 0.95))
	draw_rect(box_rect, BORDER_COLOR, false, 1.0)

	# Title
	var font := ThemeDB.fallback_font
	draw_string(font,
		box_pos + Vector2(PADDING, PADDING + 18),
		"AUDIO SETTINGS",
		HORIZONTAL_ALIGNMENT_LEFT, -1, FONT_SIZE + 2, TITLE_COLOR)


func _on_quit_to_menu() -> void:
	close()
	SessionManager.quit_to_menu()


static func _format_db(db: float) -> String:
	if db <= -40.0:
		return "mute"
	return "%d dB" % int(db)