class_name SoundtrackStatsPopup
extends BasePopup
## Shows a soundtrack's cover, play statistics and alternative names, and every song in
## it, most played first. Opened by clicking a card in the statistics view.
##
## Edit names opens an editor for the alternative names in place of the song list. Saving
## sends them to the server, which search then finds the soundtrack by.

## Emitted when the alternative names of [param soundtrack] have been saved.
signal alternative_names_changed(soundtrack: Soundtrack)

## The covers on disk, shared with the statistics view. No cover is shown without it.
var covers: CoverCache
## The soundtrack shown.
var soundtrack: SoundtrackWithSongs

# The names in the editor, saved only when Save is pressed
var _edited_names: Array[String] = []

@onready var title_label: Label = %TitleLabel
@onready var summary_label: Label = %SummaryLabel
@onready var cover_picture: TextureRect = %CoverPicture
@onready var cover_placeholder: Label = %CoverPlaceholder
@onready var names_label: Label = %NamesLabel
@onready var edit_names_button: Button = %EditNamesButton
@onready var song_scroll: ScrollContainer = %ScrollContainer
@onready var song_list: VBoxContainer = %SongList
@onready var names_editor: VBoxContainer = %NamesEditor
@onready var editor_names: VBoxContainer = %EditorNames
@onready var new_name_field: LineEdit = %NewNameField
@onready var add_name_button: Button = %AddNameButton
@onready var editor_status: Label = %EditorStatus
@onready var save_names_button: Button = %SaveNamesButton
@onready var cancel_names_button: Button = %CancelNamesButton


func _ready() -> void:
	edit_names_button.pressed.connect(edit_names)
	add_name_button.pressed.connect(add_name)
	new_name_field.text_submitted.connect(func(_text: String) -> void: add_name())
	save_names_button.pressed.connect(save_names)
	cancel_names_button.pressed.connect(stop_editing)


## Shows [param shown] and opens the popup.
func show_soundtrack(shown: SoundtrackWithSongs) -> void:
	soundtrack = shown
	stop_editing()
	title_label.text = shown.soundtrack_name
	var summary: PackedStringArray = [SoundtrackCard.played_text(shown.soundtrack_played)]
	var last_played: String = SoundtrackCard.last_played_text(shown.soundtrack_last_played)
	if !last_played.is_empty():
		summary.append(last_played)
	summary.append("%d %s" % [shown.songs.size(),
			"song" if shown.songs.size() == 1 else "songs"])
	summary_label.text = " · ".join(summary)
	_show_names()

	cover_placeholder.text = SoundtrackCard.initials(shown.soundtrack_name)
	_show_cover(null)
	if covers != null:
		covers.fetch_cover(shown.soundtrack_uuid, shown.cover_modified,
				_show_cover_of.bind(shown.soundtrack_uuid))

	Settings.delete_children(song_list)
	var songs: Array[SongInfoForStats] = SoundtrackCard.songs_by_plays(shown.songs)
	for row: int in songs.size():
		song_list.add_child(ListRow.create(SoundtrackCard.song_text(songs[row]), row,
				&"TextLarge"))
	open()


## Opens the editor for the alternative names, in place of the song list.
func edit_names() -> void:
	_edited_names.assign(soundtrack.alternative_names)
	new_name_field.text = ""
	editor_status.visible = false
	_show_edited_names()
	names_editor.visible = true
	song_scroll.visible = false
	edit_names_button.disabled = true
	new_name_field.grab_focus()


## Closes the editor without saving.
func stop_editing() -> void:
	names_editor.visible = false
	song_scroll.visible = true
	edit_names_button.disabled = false
	_set_saving(false)


## Adds the name in the field to the edited names, unless it is empty, the soundtrack's
## own name or already there.
func add_name() -> void:
	var new_name: String = new_name_field.text.strip_edges()
	if new_name.is_empty() || new_name.to_lower() == soundtrack.soundtrack_name.to_lower() \
			|| _edited_names.any(func(name: String) -> bool:
				return name.to_lower() == new_name.to_lower()):
		return
	_edited_names.append(new_name)
	new_name_field.text = ""
	_show_edited_names()


## Takes [param removed] out of the edited names.
func remove_name(removed: String) -> void:
	_edited_names.erase(removed)
	_show_edited_names()


## Sends the edited names to the server. The editor closes when they are saved.
func save_names() -> void:
	# A name typed but not added yet is meant to be saved too
	add_name()
	_set_saving(true)
	MusicServerClient.set_alternative_names(soundtrack.soundtrack_uuid, _edited_names,
			_on_names_saved, _on_names_not_saved)


func _on_names_saved(updated: Soundtrack) -> void:
	soundtrack.alternative_names = updated.alternative_names
	_show_names()
	stop_editing()
	alternative_names_changed.emit(updated)


func _on_names_not_saved() -> void:
	_set_saving(false)
	editor_status.text = "Could not save the names. Try again."
	editor_status.visible = true


func _set_saving(saving: bool) -> void:
	save_names_button.disabled = saving
	cancel_names_button.disabled = saving
	save_names_button.text = "Saving…" if saving else "Save"


func _show_names() -> void:
	var names: Array[String] = soundtrack.alternative_names
	names_label.text = ", ".join(names) if !names.is_empty() else "No other names yet"


func _show_edited_names() -> void:
	Settings.delete_children(editor_names)
	for row: int in _edited_names.size():
		var line: HBoxContainer = HBoxContainer.new()
		var label: Label = Label.new()
		label.text = _edited_names[row]
		label.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		label.text_overrun_behavior = TextServer.OVERRUN_TRIM_ELLIPSIS
		line.add_child(label)
		var remove: Button = Button.new()
		remove.text = "Remove"
		remove.focus_mode = Control.FOCUS_NONE
		remove.pressed.connect(remove_name.bind(_edited_names[row]))
		line.add_child(remove)
		var list_row: PanelContainer = PanelContainer.new()
		list_row.theme_type_variation = &"ListRowOdd" if row % 2 != 0 else &"ListRowEven"
		list_row.add_child(line)
		editor_names.add_child(list_row)


func _show_cover(cover: Image) -> void:
	cover_picture.texture = ImageTexture.create_from_image(cover) if cover != null else null
	cover_placeholder.visible = cover == null


# Covers arrive later; one for a soundtrack no longer shown is left out
func _show_cover_of(cover: Image, uuid: String) -> void:
	if soundtrack != null && soundtrack.soundtrack_uuid == uuid:
		_show_cover(cover)