extends MarginContainer
class_name AddNodeMenu

@onready var search_line_edit: LineEdit = %SearchLineEdit
@onready var scroll_content_container: VBoxContainer = %ScrollContentContainer
@onready var scroll_container: ScrollContainer = $VBoxContainer/ScrollContainer

var categories: Dictionary = {} # Dictionary[String, Category]
var collapsed_categories: Array[String]

signal node_selected(type: String)


func _ready() -> void:
	search("")


func add_category(category_name: String) -> void:
	var c := Category.new(category_name.capitalize())
	categories[category_name] = c
	scroll_content_container.add_child(c)
	c.collapse_toggled.connect(_on_category_collapse_toggled.bind(category_name))
	c.item_pressed.connect(
		func(item: int):
			node_selected.emit(c.get_item_metadata(item, "type"))
	)
	c.item_favorite_button_toggled.connect(
		func(item: int, toggled: bool):
			NodeDB.set_node_favorite(c.get_item_metadata(item, "type"), toggled)
	)


func add_category_item(category: String, item: String, tooltip: String = "", favorite: bool = false) -> void:
	var c: Category = categories[category]
	c.add_item(item, tooltip, favorite)


func add_item(category: String, item: String, tooltip: String = "", favorite: bool = false) -> void:
	if !categories.has(category):
		add_category(category)

	add_category_item(category, item, tooltip, favorite)


func get_category(category: String) -> Category:
	return categories[category]


func focus_search_bar() -> void:
	search_line_edit.select_all()
	search_line_edit.grab_focus()


func search(text: String) -> void:
	scroll_content_container.get_children().map(func(c: Node): c.queue_free())
	categories.clear()

	var search_results := SearchProvider.search(text)
	if search_results.is_empty():
		return

	for nd in search_results:
		add_item(nd.category, nd.name, nd.description, NodeDB.is_node_favorite(nd.type))
		var c := get_category(nd.category)
		c.set_item_metadata(c.get_item_count() - 1, "type", nd.type)
		c.set_item_metadata(c.get_item_count() - 1, "node_descriptor", weakref(nd))
		c.set_collapsed(nd.category in collapsed_categories)

	get_category(categories.keys()[0]).highlight_item(0)


func _on_search_line_edit_gui_input(event: InputEvent) -> void:
	if event.is_action_pressed("ui_down"):
		var category: Category
		for i: String in categories:
			var c: Category = categories[i]
			if c.get_highlighted_item() != -1:
				category = c
				break
		var item := category.get_highlighted_item()
		if item + 1 == category.get_item_count():
			# reached the end of items in the current category
			category.unhighlight_all()

			var nc: Category
			if category.get_index() + 1 == scroll_content_container.get_child_count():
				# reached the end, get the first category
				nc = scroll_content_container.get_child(0)
			else:
				# there is another category after this
				nc = scroll_content_container.get_child(category.get_index() + 1)
			nc.highlight_item(0)
			scroll_container.ensure_control_visible(nc.get_child(0))
			return

		category.highlight_item(item + 1)
		scroll_container.ensure_control_visible(category.get_child(item + 1))

	if event.is_action_pressed("ui_up"):
		var category: Category
		for i: String in categories:
			var c: Category = categories[i]
			if c.get_highlighted_item() != -1:
				category = c
				break
		var item := category.get_highlighted_item()
		if item - 1 == -1:
			# reached the beginning of items in the current category
			category.unhighlight_all()

			var nc: Category
			if category.get_index() - 1 == -1:
				# reached the beginning, get the last category
				nc = scroll_content_container.get_child(scroll_content_container.get_child_count() - 1)
			else:
				# there is another category before this
				nc = scroll_content_container.get_child(category.get_index() - 1)
			nc.highlight_item(nc.get_item_count() - 1)
			scroll_container.ensure_control_visible(nc.get_child(nc.get_item_count() - 1))
			return

		category.highlight_item(item - 1)
		scroll_container.ensure_control_visible(category.get_child(item - 1))


func _on_search_line_edit_text_submitted(_new_text: String) -> void:
	var category: Category
	for i: String in categories:
			var c: Category = categories[i]
			if c.get_highlighted_item() != -1:
				category = c
				break
	node_selected.emit(category.get_item_metadata(category.get_highlighted_item(), "type"))


func _on_category_collapse_toggled(collapsed: bool, category: String) -> void:
	if collapsed:
		collapsed_categories.append(category)
	else:
		collapsed_categories.erase(category)


class Category extends VBoxContainer:
	const COLLAPSE_ICON := preload("res://graph_node_renderer/textures/collapse-icon.svg")
	const COLLAPSE_ICON_COLLAPSED := preload("res://graph_node_renderer/textures/collapse-icon-collapsed.svg")

	var collapse_button: Button

	signal item_pressed(item: int)
	signal item_favorite_button_toggled(item: int, toggled: bool)
	signal collapse_toggled(collapsed: bool)


	func _init(p_name: String) -> void:
		collapse_button = Button.new()
		collapse_button.alignment = HORIZONTAL_ALIGNMENT_LEFT
		collapse_button.icon = COLLAPSE_ICON
		collapse_button.toggle_mode = true
		collapse_button.flat = true
		collapse_button.size_flags_vertical = Control.SIZE_EXPAND_FILL
		collapse_button.text = p_name
		collapse_button.toggled.connect(
			func(toggled: bool):
				collapse_toggled.emit(toggled)
		)
		add_child(collapse_button, false, Node.INTERNAL_MODE_FRONT)

		renamed.connect(func():
			collapse_button.name = name
		)
		collapse_button.toggled.connect(set_collapsed)


	func set_collapsed(collapsed: bool) -> void:
		collapse_button.icon = COLLAPSE_ICON_COLLAPSED if collapsed else COLLAPSE_ICON
		collapse_button.set_pressed_no_signal(collapsed)
		for c: CategoryItem in get_children():
			c.visible = !collapsed


	func add_item(p_name: String, p_tooltip: String, p_favorite: bool = false) -> void:
		var item := CategoryItem.new(p_name, p_tooltip, p_favorite)
		item.favorite_toggled.connect(
			func(toggled: bool):
				item_favorite_button_toggled.emit(item.get_index(), toggled)
		)
		item.pressed.connect(
			func():
				item_pressed.emit(item.get_index())
		)
		add_child(item)


	func set_item_metadata(item: int, key: StringName, metadata: Variant) -> void:
		get_child(item).set_meta(key, metadata)


	func get_item_metadata(item: int, key: StringName) -> Variant:
		return get_child(item).get_meta(key)


	func get_item_count() -> int:
		return get_child_count()


	func set_item_favorite(item:int, favorite: bool) -> void:
		var _item := get_child(item) as CategoryItem
		_item.set_favorite(favorite)


	func is_item_favorite(item: int) -> bool:
		var _item := get_child(item) as CategoryItem
		return _item.is_favorite()


	func highlight_item(item: int) -> void:
		for c: CategoryItem in get_children():
			c.set_highlighted(c.get_index() == item)


	func unhighlight_all() -> void:
		for c: CategoryItem in get_children():
			c.set_highlighted(false)


	func get_highlighted_item() -> int:
		for c: CategoryItem in get_children():
			if c.is_highlighted:
				return c.get_index()

		return -1


class CategoryItem extends HBoxContainer:
	const FAVORITE_ICON := preload("res://graph_node_renderer/textures/favorite-icon.svg")
	const NON_FAVORITE_ICON := preload("res://graph_node_renderer/textures/non-favorite-icon.svg")
	const ITEM_MARGIN := 16

	var highlighted_stylebox := StyleBoxFlat.new()

	var is_highlighted: bool

	var fav_button: Button
	var name_button: Button
	var panel: PanelContainer

	signal pressed
	signal favorite_toggled(toggled: bool)


	func _init(p_name: String, p_tooltip: String, p_favorite: bool) -> void:
		fav_button = Button.new()
		fav_button.icon = FAVORITE_ICON if p_favorite else NON_FAVORITE_ICON
		fav_button.toggle_mode = true
		fav_button.set_pressed_no_signal(p_favorite)
		fav_button.flat = true
		fav_button.toggled.connect(
			func(toggled: bool):
				favorite_toggled.emit(toggled)
		)
		fav_button.toggled.connect(set_favorite)

		name_button = Button.new()
		name_button.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		name_button.text = p_name
		name_button.flat = true
		name_button.alignment = HORIZONTAL_ALIGNMENT_LEFT
		name_button.tooltip_text = p_tooltip
		name_button.pressed.connect(
			func():
				pressed.emit()
		)

		var mc := MarginContainer.new()
		mc.add_theme_constant_override(&"margin_left", ITEM_MARGIN)

		panel = PanelContainer.new()
		panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		panel.add_theme_stylebox_override(&"panel", highlighted_stylebox)
		highlighted_stylebox.bg_color = Color(0.0, 0.0, 0.0, 0.15)
		panel.self_modulate = Color.TRANSPARENT

		var inner_hb := HBoxContainer.new()
		inner_hb.add_child(fav_button)
		inner_hb.add_child(name_button)
		panel.add_child(inner_hb)

		add_child(mc)
		add_child(panel)


	func set_favorite(favorite: bool) -> void:
		fav_button.icon = FAVORITE_ICON if favorite else NON_FAVORITE_ICON
		fav_button.set_pressed_no_signal(favorite)


	func is_favorite() -> bool:
		return fav_button.icon == FAVORITE_ICON


	func set_highlighted(highlighted: bool) -> void:
		is_highlighted = highlighted
		if highlighted:
			panel.self_modulate = Color.WHITE
		else:
			panel.self_modulate = Color.TRANSPARENT