class_name ChoiceGroup
extends BoxContainer
## Segmented choice with the OptionButton surface used by tools and tests:
## select(index) changes the display only, item_selected fires on player input.
## Selection shows a filled diamond, a bright frame and brighter text, never colour alone.

signal item_selected(index: int)

const MARK_ON := preload("res://assets/ui/controls/choice_on.svg")
const MARK_OFF := preload("res://assets/ui/controls/choice_off.svg")

var selected: int = -1
var _buttons: Array[Button] = []
var _marks: Array[TextureRect] = []
var _group := ButtonGroup.new()

func _init(horizontal: bool = true) -> void:
	vertical = not horizontal
	add_theme_constant_override("separation", 8)

func add_option(title: String, detail: String = "", tooltip: String = "") -> Button:
	var button := Button.new()
	button.theme_type_variation = "ChoiceButton"
	button.toggle_mode = true
	button.button_group = _group
	button.focus_mode = Control.FOCUS_ALL
	button.mouse_default_cursor_shape = Control.CURSOR_POINTING_HAND
	button.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	button.tooltip_text = tooltip
	button.set_meta("title", title)
	var row := HBoxContainer.new()
	row.mouse_filter = Control.MOUSE_FILTER_IGNORE
	row.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	row.offset_left = 14
	row.offset_right = -12
	row.add_theme_constant_override("separation", 12)
	button.add_child(row)
	var mark := TextureRect.new()
	mark.texture = MARK_OFF
	mark.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	mark.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
	mark.custom_minimum_size = Vector2(16, 16)
	mark.mouse_filter = Control.MOUSE_FILTER_IGNORE
	mark.size_flags_vertical = Control.SIZE_SHRINK_CENTER
	row.add_child(mark)
	var text := VBoxContainer.new()
	text.mouse_filter = Control.MOUSE_FILTER_IGNORE
	text.alignment = BoxContainer.ALIGNMENT_CENTER
	text.add_theme_constant_override("separation", 0)
	text.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	row.add_child(text)
	var heading := Label.new()
	heading.text = title
	heading.mouse_filter = Control.MOUSE_FILTER_IGNORE
	heading.add_theme_font_size_override("font_size", 18)
	text.add_child(heading)
	if not detail.is_empty():
		var info := Label.new()
		info.text = detail
		info.theme_type_variation = "MutedLabel"
		info.mouse_filter = Control.MOUSE_FILTER_IGNORE
		info.add_theme_font_size_override("font_size", 15)
		info.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
		text.add_child(info)
	var base_height: float = 62.0 if not detail.is_empty() else 46.0
	button.custom_minimum_size = Vector2(0, base_height)
	# Buttons do not size to child controls; follow the wrapped text height instead.
	row.minimum_size_changed.connect(func() -> void:
		button.custom_minimum_size.y = maxf(base_height, row.get_combined_minimum_size().y + 20.0))
	var index: int = _buttons.size()
	button.pressed.connect(func() -> void:
		if selected != index:
			select(index)
			item_selected.emit(index))
	add_child(button)
	_buttons.append(button)
	_marks.append(mark)
	return button

func select(index: int) -> void:
	if index < 0 or index >= _buttons.size():
		return
	selected = index
	for i: int in range(_buttons.size()):
		_buttons[i].set_pressed_no_signal(i == index)
		_marks[i].texture = MARK_ON if i == index else MARK_OFF
		_buttons[i].set_meta("selected", i == index)

func get_item_count() -> int:
	return _buttons.size()

func get_button(index: int) -> Button:
	return _buttons[index]

func focus_selected() -> void:
	if selected >= 0 and selected < _buttons.size():
		_buttons[selected].grab_focus()