extends Control
## Pause menu (ESC): resume, controls, fullscreen, mouse sensitivity, quit.
## Pauses the scene tree while open; runs with PROCESS_MODE_ALWAYS so it still
## gets input.

const UITheme = preload("res://scripts/ui/theme.gd")

const CONTROLS := [
	["W A S D", "Move"], ["Shift", "Sprint"], ["Space", "Jump / swim up"],
	["Mouse", "Look"], ["E", "Interact / pick up / add fuel"], ["Left click", "Use tool / place"],
	["Right click (holding food)", "Eat"],
	["R", "Rotate piece"], ["1 - 8, wheel", "Hotbar"], ["Tab", "Inventory & crafting"],
	["Shift + click", "Move stack to/from a chest"], ["Right click", "Split stack"],
	["Esc", "This menu (game autosaves every 2 min)"],
]

var player: CharacterBody3D
var _main: VBoxContainer
var _controls: VBoxContainer
var _quit_btn: Button
var _quit_armed := false

func bind(p: CharacterBody3D) -> void:
	player = p
	process_mode = Node.PROCESS_MODE_ALWAYS
	set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	mouse_filter = Control.MOUSE_FILTER_STOP
	visible = false

	var dim := ColorRect.new()
	dim.color = Color(0, 0, 0, 0.55)
	dim.set_anchors_preset(Control.PRESET_FULL_RECT)
	dim.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(dim)

	var center := CenterContainer.new()
	center.set_anchors_preset(Control.PRESET_FULL_RECT)
	center.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(center)
	var panel := UITheme.panel()
	panel.custom_minimum_size = Vector2(380, 0)
	center.add_child(panel)
	var stack := VBoxContainer.new()
	panel.add_child(stack)

	# Main page.
	_main = VBoxContainer.new()
	_main.add_theme_constant_override("separation", 10)
	stack.add_child(_main)
	var title := UITheme.label("Paused", 30)
	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_main.add_child(title)
	_main.add_child(_button("Resume", close))
	_main.add_child(_button("Controls", _show_controls.bind(true)))

	var fs := CheckButton.new()
	fs.text = "Fullscreen"
	fs.focus_mode = Control.FOCUS_NONE
	fs.button_pressed = DisplayServer.window_get_mode() == DisplayServer.WINDOW_MODE_FULLSCREEN
	fs.add_theme_font_size_override("font_size", 18)
	fs.toggled.connect(_on_fullscreen)
	_main.add_child(fs)

	var sens_row := HBoxContainer.new()
	sens_row.add_child(UITheme.label("Mouse sensitivity", 16))
	var sens := HSlider.new()
	sens.min_value = 0.0005
	sens.max_value = 0.006
	sens.step = 0.0001
	sens.value = player.mouse_sensitivity
	sens.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	sens.focus_mode = Control.FOCUS_NONE
	sens.value_changed.connect(func(v: float): player.mouse_sensitivity = v)
	sens_row.add_child(sens)
	_main.add_child(sens_row)

	var saved: bool = Saves.has_world()
	if saved:
		_main.add_child(_button("Save & Quit to Title", _on_quit_to_title))
		_quit_btn = _button("Save & Quit to Desktop", _on_quit)
	else:
		_quit_btn = _button("Quit to Desktop", _on_quit)
	_main.add_child(_quit_btn)
	var note_text := "Autosaves every 2 minutes.  World: %s" % Saves.read_meta(Saves.current_id).get("name", "?") if saved \
		else "Not playing a saved world: progress won't be kept."
	var note := UITheme.label(note_text, 13, UITheme.TEXT_DIM)
	note.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_main.add_child(note)

	# Controls page.
	_controls = VBoxContainer.new()
	_controls.add_theme_constant_override("separation", 6)
	_controls.visible = false
	stack.add_child(_controls)
	var ct := UITheme.label("Controls", 26)
	ct.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	_controls.add_child(ct)
	var grid := GridContainer.new()
	grid.columns = 2
	grid.add_theme_constant_override("h_separation", 24)
	for row in CONTROLS:
		grid.add_child(UITheme.label(row[0], 16, UITheme.SELECTED))
		grid.add_child(UITheme.label(row[1], 16))
	_controls.add_child(grid)
	_controls.add_child(_button("Back", _show_controls.bind(false)))

func _button(text: String, cb: Callable) -> Button:
	var b := Button.new()
	b.text = text
	b.focus_mode = Control.FOCUS_NONE
	b.custom_minimum_size = Vector2(0, 42)
	b.add_theme_font_size_override("font_size", 18)
	b.pressed.connect(cb)
	return b

func is_open() -> bool:
	return visible

func open() -> void:
	visible = true
	_show_controls(false)
	_disarm_quit()
	player.ui_open = true
	get_tree().paused = true
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE

func close() -> void:
	visible = false
	player.ui_open = false
	get_tree().paused = false
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED

## ESC on the controls page goes back; on the main page it resumes.
func back() -> void:
	if _controls.visible:
		_show_controls(false)
	else:
		close()

func _show_controls(on: bool) -> void:
	_controls.visible = on
	_main.visible = not on

func _on_fullscreen(on: bool) -> void:
	DisplayServer.window_set_mode(DisplayServer.WINDOW_MODE_FULLSCREEN if on else DisplayServer.WINDOW_MODE_WINDOWED)

func _on_quit() -> void:
	if Saves.has_world():
		player.get_parent().save_now()
		get_tree().quit()
		return
	# Unsaved session: ask twice so nobody loses a run by accident.
	if not _quit_armed:
		_quit_armed = true
		_quit_btn.text = "Click again to quit"
		return
	get_tree().quit()

func _on_quit_to_title() -> void:
	player.get_parent().save_now()
	get_tree().paused = false
	Saves.current_id = ""
	get_tree().auto_accept_quit = true
	get_tree().change_scene_to_file("res://scenes/title.tscn")

func _disarm_quit() -> void:
	_quit_armed = false
	_quit_btn.text = "Save & Quit to Desktop" if Saves.has_world() else "Quit to Desktop"