class_name SearchPopup
extends BasePopup
## Searches every soundtrack on the server as you type, with [SoundtrackSearch], and
## highlights the letters that matched. Soundtracks are also found by their alternative
## names; the alternative name that matched is shown after the real name.

## Emitted with every soundtrack on the server when the list has loaded.
signal soundtracks_loaded(list: Array[Soundtrack])

## Every soundtrack on the server, sorted by name.
var soundtracks: Array = []

var _matcher: SoundtrackSearch = SoundtrackSearch.new()
# One row per soundtrack, in the order of soundtracks. Rows are reused between searches.
var _rows: Array[PanelContainer] = []
var _index_of: Dictionary = {}
# The other names of each soundtrack, by its real name
var _alternatives: Dictionary = {}

@onready var search_panel: Panel = %SearchPanel
@onready var search_field: LineEdit = %SearchField
@onready var clear_button: Button = %ClearButton
@onready var count_label: Label = %CountLabel
@onready var empty_label: Label = %EmptyLabel
@onready var search_results: VBoxContainer = %SearchResults


func _ready() -> void:
	clear_button.pressed.connect(clear)
	search_field.text_changed.connect(func(_text: String) -> void: search())
	visibility_changed.connect(_on_visibility_changed)


func close() -> void:
	clear()
	super()


## Empties the search field and shows every soundtrack.
func clear() -> void:
	search_field.text = ""
	search()
	search_field.grab_focus()


## Shows the soundtracks matching the search field, best matches first, or all of them
## when it is empty.
func search() -> void:
	var search_text: String = search_field.text.strip_edges()
	var shown: Array[int] = []
	if search_text.is_empty():
		shown.assign(range(soundtracks.size()))
	else:
		for soundtrack: String in _matcher.find_matches(search_text):
			shown.append(_index_of[soundtrack])

	var is_shown: Array[bool] = []
	is_shown.resize(_rows.size())
	for position: int in shown.size():
		var row: PanelContainer = _rows[shown[position]]
		if row.get_index() != position:
			search_results.move_child(row, position)
		# Rows that come back with the search fade in
		if !row.visible:
			Anim.fade_in(row, Anim.FAST)
		row.visible = true
		row.theme_type_variation = &"ListRowOdd" if position % 2 != 0 else &"ListRowEven"
		_show_name(row, soundtracks[shown[position]], search_text)
		is_shown[shown[position]] = true
	for index: int in _rows.size():
		if !is_shown[index]:
			_rows[index].visible = false

	empty_label.visible = shown.is_empty() && !soundtracks.is_empty()
	if search_text.is_empty():
		count_label.text = "%d soundtracks" % soundtracks.size()
	else:
		count_label.text = "%d of %d soundtracks" % [shown.size(), soundtracks.size()]


## The names of the soundtracks shown, in the order they are shown.
func shown_names() -> Array[String]:
	var names: Array[String] = []
	for row: PanelContainer in search_results.get_children():
		if row.visible:
			names.append(row.get_meta(&"soundtrack"))
	return names


func get_list_of_soundtracks() -> void:
	GameLog.debug("get_list_of_soundtracks")
	if Settings.is_offline():
		set_soundtracks(Settings.music_folder.soundtrack_names())
		return
	var with_names: Callable = func with_names(list: Array[Soundtrack]) -> void:
		var names: Array[String] = []
		var alternatives: Dictionary = {}
		for soundtrack: Soundtrack in list:
			names.append(soundtrack.name)
			alternatives[soundtrack.name] = soundtrack.alternative_names
		names.sort_custom(func(a: String, b: String) -> bool:
			return a.naturalnocasecmp_to(b) < 0)
		set_soundtracks(names, alternatives)
		soundtracks_loaded.emit(list)
	MusicServerClient.fetch_soundtracks(with_names, _load_names_only)


## Replaces the searchable soundtracks and shows them, keeping the current search.
## [param alternatives] has the other names of a soundtrack, by its real name.
func set_soundtracks(list: Array, alternatives: Dictionary = {}) -> void:
	soundtracks = []
	soundtracks.append_array(list)
	_alternatives = alternatives
	_matcher.set_names(soundtracks, alternatives)
	_index_of.clear()
	for index: int in range(soundtracks.size() - 1, -1, -1):
		_index_of[soundtracks[index]] = index
	while _rows.size() < soundtracks.size():
		var row: PanelContainer = _make_row()
		search_results.add_child(row)
		_rows.append(row)
	while _rows.size() > soundtracks.size():
		_rows.pop_back().free()
	for index: int in soundtracks.size():
		_rows[index].set_meta(&"soundtrack", soundtracks[index])
	search()


## [param soundtrack_name] as BBCode, with the letters [param search_text] matched in
## [param highlight_color].
static func highlighted_name(
		soundtrack_name: String, search_text: String, highlight_color: Color) -> String:
	var matched: Array[int] = SoundtrackSearch.matched_letters(soundtrack_name, search_text)
	var text: String = ""
	var in_highlight: bool = false
	for i: int in soundtrack_name.length():
		var highlight: bool = matched.has(i)
		if highlight != in_highlight:
			text += "[color=#%s]" % highlight_color.to_html(false) if highlight else "[/color]"
			in_highlight = highlight
		var letter: String = soundtrack_name[i]
		text += "[lb]" if letter == "[" else letter
	if in_highlight:
		text += "[/color]"
	return text


func _make_row() -> PanelContainer:
	var row: PanelContainer = PanelContainer.new()
	var label: RichTextLabel = RichTextLabel.new()
	label.theme_type_variation = &"SearchResult"
	label.bbcode_enabled = true
	label.fit_content = true
	label.scroll_active = false
	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	label.mouse_filter = Control.MOUSE_FILTER_IGNORE
	row.add_child(label)
	return row


# Servers without /soundtracks only list the names
func _load_names_only() -> void:
	MusicServerClient.fetch_all_soundtracks_ordered(func(array: Variant) -> void:
		if typeof(array) == TYPE_ARRAY:
			set_soundtracks(array)
		else:
			GameLog.warning("Unexpected data"))


func _show_name(row: PanelContainer, soundtrack_name: String, search_text: String) -> void:
	var highlight: Color = get_theme_color(&"font_color", &"HighlightLarge")
	var text: String = highlighted_name(soundtrack_name, search_text, highlight)
	# Found by another name: show which, dimmer, after the real name
	var alternative: String = _matcher.matched_alternative(soundtrack_name) \
			if !search_text.is_empty() else ""
	if !alternative.is_empty():
		text += "  [color=#%s]%s[/color]" % [
				get_theme_color(&"default_color", &"SongStatsSecondary").to_html(false),
				highlighted_name(alternative, search_text, highlight)]
	var label: RichTextLabel = row.get_child(0)
	# Setting the same text again would make the label lay it out again for nothing
	if label.text != text:
		label.text = text


func _on_visibility_changed() -> void:
	if visible:
		clear()