class_name SongRow
extends PanelContainer
## One song in the music list: its number, soundtrack and title, and the character of
## each player who got a point for it.
##
## The pictures are on the right and the text takes the room they leave, wrapping only
## when it does not fit on one line. With many pictures they go on more lines, as even as
## possible and at most [constant MAX_PICTURES_PER_LINE] on each, so the text keeps most
## of the row. Every line ends at the row's right edge. The row is as tall as the taller
## of the text and the pictures.

## The most pictures on one line before they go on another.
const MAX_PICTURES_PER_LINE: int = 4
## The size of each picture. Characters are twice as wide as they are tall.
const PICTURE_SIZE: Vector2 = Vector2(56, 28)

var song_object: SongObject
## The row's place in the list, for the alternating background.
var index: int = 0

var _hovered: bool = false

@onready var song_list_label: Label = %SongListLabel
## The lines of pictures, top to bottom, each an HBoxContainer.
@onready var song_list_players: VBoxContainer = %SongListPlayers


func _ready() -> void:
	mouse_entered.connect(_set_hovered.bind(true))
	mouse_exited.connect(_set_hovered.bind(false))
	set_label()
	update_players()


## The pictures shown, line by line.
func pictures() -> Array[TextureRect]:
	var shown: Array[TextureRect] = []
	for line: Node in song_list_players.get_children():
		shown.append_array(line.get_children())
	return shown


## The number of pictures on a full line for [param pictures] pictures: as few lines as
## [constant MAX_PICTURES_PER_LINE] allows, with the pictures spread evenly over them,
## e.g. 3 and 2 for five pictures instead of 4 and 1.
static func picture_columns(pictures: int) -> int:
	if pictures <= 0:
		return 1
	var lines: int = ceili(float(pictures) / MAX_PICTURES_PER_LINE)
	return ceili(float(pictures) / lines)


func set_label() -> void:
	if song_object != null:
		song_list_label.theme_type_variation = &"SongRowLabelPlaying" \
				if song_object.is_playing else &"SongRowLabel"
		song_list_label.text = song_object.get_song_info()
	_update_style()


func update_players() -> void:
	Settings.delete_children(song_list_players)
	var scorers: Array[PlayerObject] = []
	if song_object != null:
		# Show players in the same order as the player list
		for player: PlayerObject in Settings.player_array:
			if song_object.players_given_point.has(player.id):
				scorers.append(player)
	var per_line: int = picture_columns(scorers.size())
	var line: HBoxContainer = null
	for i: int in scorers.size():
		if i % per_line == 0:
			line = HBoxContainer.new()
			line.theme_type_variation = &"SongRowPictureLine"
			line.alignment = BoxContainer.ALIGNMENT_END
			line.mouse_filter = Control.MOUSE_FILTER_IGNORE
			song_list_players.add_child(line)
		line.add_child(_make_picture(scorers[i]))
	song_list_players.visible = !scorers.is_empty()


func _make_picture(player: PlayerObject) -> TextureRect:
	var picture: TextureRect = TextureRect.new()
	picture.texture = player.character
	picture.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	picture.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
	picture.custom_minimum_size = PICTURE_SIZE
	picture.tooltip_text = player.player_name
	# Clicks on a picture still click the row
	picture.mouse_filter = Control.MOUSE_FILTER_PASS
	return picture


func _set_hovered(hovered: bool) -> void:
	_hovered = hovered
	_update_style()


func _update_style() -> void:
	if _hovered:
		theme_type_variation = &"SongRowHover"
	elif song_object != null && song_object.is_playing:
		theme_type_variation = &"SongRowPlaying"
	else:
		theme_type_variation = &"SongRowOdd" if index % 2 != 0 else &"SongRow"