extends CanvasLayer
## Volumes and key bindings.
##
## Reachable from the main menu and from the in-game menu, and the same screen
## both times: settings are local to this client, so there is nothing about the
## game's state that should change what it can do.

signal closed
signal credits_requested

var _rows: Dictionary[String, Button] = {}
var _status: Label
var _master: HSlider
var _sfx: HSlider
var _master_value: Label
var _sfx_value: Label
## The action currently waiting for a key press, or empty.
var _listening: String = ""


func _ready() -> void:
	layer = 32
	visible = false
	var root := UiTheme.themed_root()
	add_child(root)

	var scrim := ColorRect.new()
	scrim.color = Color(0.03, 0.03, 0.06, 0.94)
	scrim.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	scrim.mouse_filter = Control.MOUSE_FILTER_STOP
	root.add_child(scrim)

	var centre := CenterContainer.new()
	centre.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	root.add_child(centre)

	# A panel, so a dialog reads as a thing laid over the world rather
	# than as text floating on a dimmed one.
	var frame := UiTheme.dialog_panel()
	centre.add_child(frame)

	var panel := VBoxContainer.new()
	panel.custom_minimum_size = Vector2(520.0, 0.0)
	panel.add_theme_constant_override("separation", 8)
	frame.add_child(panel)

	var title := Label.new()
	title.text = "SETTINGS"
	title.add_theme_font_size_override("font_size", 26)
	panel.add_child(title)

	panel.add_child(_heading("SOUND"))
	var master_row := _slider_row(panel, "Master")
	_master = master_row[0]
	_master_value = master_row[1]
	var sfx_row := _slider_row(panel, "Effects")
	_sfx = sfx_row[0]
	_sfx_value = sfx_row[1]

	panel.add_child(_heading("CONTROLS"))
	_status = Label.new()
	_status.add_theme_font_size_override("font_size", 12)
	_status.add_theme_color_override("font_color", Color(1.0, 0.7, 0.5))
	panel.add_child(_status)

	# Scrolled: thirteen rows is more than fits on a short window, and a list
	# that runs off the bottom of the screen is a list with unreachable entries.
	var scroll := ScrollContainer.new()
	scroll.custom_minimum_size = Vector2(520.0, 300.0)
	panel.add_child(scroll)
	var list := VBoxContainer.new()
	list.custom_minimum_size = Vector2(500.0, 0.0)
	list.add_theme_constant_override("separation", 3)
	scroll.add_child(list)
	for entry in Settings.REBINDABLE:
		_rows[String(entry[0])] = _binding_row(list, String(entry[0]), String(entry[1]))

	var buttons := HBoxContainer.new()
	buttons.add_theme_constant_override("separation", 8)
	panel.add_child(buttons)
	var reset := Button.new()
	reset.text = "Reset controls"
	reset.custom_minimum_size = Vector2(160.0, 34.0)
	reset.pressed.connect(func() -> void:
		Settings.reset_bindings()
		_status.text = "controls reset"
		refresh())
	buttons.add_child(reset)
	var credits := Button.new()
	credits.text = "Credits"
	credits.custom_minimum_size = Vector2(160.0, 34.0)
	credits.pressed.connect(func() -> void: credits_requested.emit())
	buttons.add_child(credits)
	var close := Button.new()
	close.text = "Close"
	close.custom_minimum_size = Vector2(160.0, 34.0)
	close.pressed.connect(func() -> void: closed.emit())
	buttons.add_child(close)


## A section heading on the pack's banner ribbon, so the two halves of this
## screen are visibly two sections rather than one long list.
## A section heading on the pack's banner ribbon.
##
## Deliberately narrow and centred rather than stretched across the dialog: at
## full width the ribbon stops reading as a label and becomes a bright divider
## competing with everything under it.
func _heading(text: String) -> Control:
	var row := CenterContainer.new()
	var holder := MarginContainer.new()
	holder.custom_minimum_size = Vector2(210.0, 34.0)
	row.add_child(holder)
	var banner := NinePatchRect.new()
	banner.texture = UiTheme.texture("banner")
	# The ribbon's tails hang off both ends; stretching through them would
	# smear the shape, so they are the patch margins and only the body grows.
	banner.patch_margin_left = 14
	banner.patch_margin_right = 14
	banner.patch_margin_top = 8
	banner.patch_margin_bottom = 8
	holder.add_child(banner)
	var l := Label.new()
	l.text = text
	l.add_theme_font_size_override("font_size", 13)
	l.add_theme_color_override("font_color", UiTheme.INK)
	l.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
	l.vertical_alignment = VERTICAL_ALIGNMENT_CENTER
	holder.add_child(l)
	return row


func _slider_row(parent: Control, label: String) -> Array:
	var row := HBoxContainer.new()
	row.add_theme_constant_override("separation", 10)
	parent.add_child(row)
	var name_label := Label.new()
	name_label.text = label
	name_label.custom_minimum_size = Vector2(90.0, 0.0)
	row.add_child(name_label)
	var slider := HSlider.new()
	slider.min_value = 0.0
	slider.max_value = 1.0
	slider.step = 0.05
	slider.custom_minimum_size = Vector2(340.0, 20.0)
	row.add_child(slider)
	var value := Label.new()
	value.custom_minimum_size = Vector2(50.0, 0.0)
	row.add_child(value)
	return [slider, value]


func _binding_row(parent: Control, action: String, label: String) -> Button:
	var row := HBoxContainer.new()
	row.add_theme_constant_override("separation", 10)
	parent.add_child(row)
	var name_label := Label.new()
	name_label.text = label
	name_label.custom_minimum_size = Vector2(260.0, 0.0)
	row.add_child(name_label)
	var button := Button.new()
	button.custom_minimum_size = Vector2(200.0, 30.0)
	button.pressed.connect(func() -> void: _listen_for(action))
	row.add_child(button)
	return button


func open() -> void:
	visible = true
	_listening = ""
	_status.text = ""
	refresh()


func refresh() -> void:
	_master.value = Settings.master_volume
	_sfx.value = Settings.sfx_volume
	_master_value.text = "%d%%" % roundi(Settings.master_volume * 100.0)
	_sfx_value.text = "%d%%" % roundi(Settings.sfx_volume * 100.0)
	# Connected here rather than in _ready so setting the values above cannot
	# fire the handler and write the file back on every open.
	if not _master.value_changed.is_connected(_on_master):
		_master.value_changed.connect(_on_master)
		_sfx.value_changed.connect(_on_sfx)
	for action in _rows:
		_rows[action].text = "listening..." if action == _listening \
			else Settings.binding_label(action)


func _on_master(value: float) -> void:
	Settings.master_volume = value
	Settings.apply_audio()
	Settings.save()
	_master_value.text = "%d%%" % roundi(value * 100.0)


func _on_sfx(value: float) -> void:
	Settings.sfx_volume = value
	Settings.apply_audio()
	Settings.save()
	_sfx_value.text = "%d%%" % roundi(value * 100.0)


func _listen_for(action: String) -> void:
	_listening = action
	_status.text = "press a key or mouse button  (Escape cancels)"
	refresh()


## Captures the next key or mouse button while a row is listening.
##
## _input rather than _unhandled_input on purpose: the buttons in this screen
## consume clicks, and a rebind that could never see a mouse button would be a
## rebind that cannot bind Fire.
func _input(event: InputEvent) -> void:
	if not visible or _listening.is_empty():
		return
	if event is InputEventKey and not (event as InputEventKey).pressed:
		return
	if event is InputEventMouseButton and not (event as InputEventMouseButton).pressed:
		return
	if not Settings.is_bindable(event):
		return
	get_viewport().set_input_as_handled()
	var action := _listening
	_listening = ""
	# Escape is the way out of a listening row, so it cannot also be captured
	# by one -- binding the cancel key would leave no way to cancel.
	if event is InputEventKey \
			and (event as InputEventKey).physical_keycode == KEY_ESCAPE:
		_status.text = "cancelled"
		refresh()
		return
	var clash := Settings.rebind(action, event)
	if clash.is_empty():
		_status.text = ""
	else:
		_status.text = "%s is already %s" % [
			Settings.binding_label(clash), _label_of(clash)]
	refresh()


func _label_of(action: String) -> String:
	for entry in Settings.REBINDABLE:
		if String(entry[0]) == action:
			return String(entry[1])
	return action