class_name CharacterCard
extends Panel
## One character in the character select popup: its picture and name. Clicking it picks
## the character.

## Emitted with the character's picture and name when the card is clicked.
signal new_character_selected(img_texture: ImageTexture, character_name: String)

## The character's name: its picture's file name, e.g. "PaperMario.png".
var character_name: String = ""

@onready var character_image: TextureRect = %CharacterTextureRect
@onready var character_name_label: Label = %CharacterName


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


## Shows [param character_name] and its picture. [param fetch_image] is called with the
## name and a Callable that takes the picture as an [Image], e.g.
## [method CharacterCache.fetch_image].
func set_character_name(new_name: String, fetch_image: Callable) -> void:
	character_name = new_name
	character_name_label.text = display_name(new_name)
	tooltip_text = character_name_label.text
	var image_fetched: Callable = func image_fetched(picture: Image) -> void:
		character_image.texture = ImageTexture.create_from_image(picture)
	fetch_image.call(new_name, image_fetched)


## The name to show for a picture's [param file_name]: without the file extension, and
## with words that are written together split, e.g. "PaperMario.png" is "Paper Mario".
static func display_name(file_name: String) -> String:
	var name_part: String = file_name.get_basename() if "." in file_name else file_name
	var words: RegEx = RegEx.create_from_string("([a-z])([A-Z])")
	return words.sub(name_part, "$1 $2", true)


## Reads a PNG, JPG or WebP picture, telling them apart by their first bytes so that no
## error is printed for trying the wrong format. Returns null if it is none of them.
static func image_from_bytes(bytes: PackedByteArray) -> Image:
	var image: Image = Image.new()
	var error: Error = ERR_FILE_UNRECOGNIZED
	if bytes.size() >= 4 && bytes.slice(0, 4) == PackedByteArray([0x89, 0x50, 0x4E, 0x47]):
		error = image.load_png_from_buffer(bytes)
	elif bytes.size() >= 3 && bytes.slice(0, 3) == PackedByteArray([0xFF, 0xD8, 0xFF]):
		error = image.load_jpg_from_buffer(bytes)
	elif bytes.size() >= 12 && bytes.slice(8, 12).get_string_from_ascii() == "WEBP":
		error = image.load_webp_from_buffer(bytes)
	return image if error == OK else null


func _set_hovered(hovered: bool) -> void:
	theme_type_variation = &"CharacterCardHover" if hovered else &"CharacterCard"


func _on_gui_input(event: InputEvent) -> void:
	if event is InputEventMouseButton && event.pressed \
			&& event.button_index == MOUSE_BUTTON_LEFT && Settings.character_select_open:
		accept_event()
		GameLog.debug(character_name_label.text)
		new_character_selected.emit(character_image.texture, character_name)