class_name PauseOverlay
extends CanvasLayer
## Shift pause overlay: resume, restart the shift, open settings, or quit to the
## venue menu. Opened with Esc from the world (or a dedicated pause action) and
## while the overlay is open the guard is frozen.

signal resume_requested()
signal restart_requested()
signal settings_requested()
signal quit_to_menu_requested()

const UiArt := preload("res://src/game/ui/art.gd")

var _root: Control = null
var _resume_button: Button = null

func _ready() -> void:
	layer = 18
	_build()
	hide()

func _build() -> void:
	_root = Control.new()
	_root.name = "PauseRoot"
	_root.set_anchors_preset(Control.PRESET_FULL_RECT)
	_root.mouse_filter = Control.MOUSE_FILTER_STOP
	add_child(_root)

	var art := UiArt.new()
	if not art.add_screen_backdrop(_root, "pause_overlay",
			Rect2(0.172, 0.097, 0.59, 0.813)):
		var bg := ColorRect.new()
		bg.color = Color(0.02, 0.03, 0.05, 0.82)
		bg.set_anchors_preset(Control.PRESET_FULL_RECT)
		bg.mouse_filter = Control.MOUSE_FILTER_IGNORE
		_root.add_child(bg)

	var center := CenterContainer.new()
	center.set_anchors_preset(Control.PRESET_FULL_RECT)
	_root.add_child(center)

	var column := VBoxContainer.new()
	column.custom_minimum_size = Vector2(320, 0)
	column.add_theme_constant_override("separation", 10)
	center.add_child(column)

	var title := Label.new()
	title.text = "Paused"
	title.add_theme_font_size_override("font_size", 36)
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	column.add_child(title)

	_resume_button = _add_button(column, "Resume", "ResumeButton", func(): resume_requested.emit())
	_add_button(column, "Restart shift", "RestartButton", func(): restart_requested.emit())
	_add_button(column, "Settings", "SettingsButton", func(): settings_requested.emit())
	_add_button(column, "Quit to menu", "MenuButton", func(): quit_to_menu_requested.emit())

	var hint := Label.new()
	hint.text = "Esc resumes"
	hint.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	hint.add_theme_color_override("font_color", Color(0.55, 0.58, 0.65))
	column.add_child(hint)

func _add_button(parent: Control, text: String, node_name: String, cb: Callable) -> Button:
	var button := Button.new()
	button.name = node_name
	button.text = text
	button.custom_minimum_size = Vector2(380, 52)
	button.add_theme_font_size_override("font_size", 22)
	var normal := StyleBoxFlat.new()
	normal.bg_color = Color(0.115, 0.125, 0.15, 0.96)
	normal.corner_radius_top_left = 12
	normal.corner_radius_top_right = 12
	normal.corner_radius_bottom_left = 12
	normal.corner_radius_bottom_right = 12
	var hover := normal.duplicate() as StyleBoxFlat
	hover.bg_color = Color(0.16, 0.175, 0.21, 0.98)
	button.add_theme_stylebox_override("normal", normal)
	button.add_theme_stylebox_override("hover", hover)
	button.add_theme_stylebox_override("focus", hover)
	button.add_theme_stylebox_override("pressed", hover)
	button.pressed.connect(cb)
	parent.add_child(button)
	return button

func open() -> void:
	visible = true
	_root.visible = true
	Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
	if _resume_button:
		_resume_button.grab_focus()

func close() -> void:
	visible = false
	_root.visible = false

func _unhandled_input(event: InputEvent) -> void:
	if not visible:
		return
	if event is InputEventKey and event.pressed and not event.echo and event.keycode == KEY_ESCAPE:
		resume_requested.emit()
		get_viewport().set_input_as_handled()