extends GdUnitTestSuite
## Characters read from a folder on this computer instead of the server.

var _root: String


func before_test() -> void:
	_root = create_temp_dir("folder_characters_%d" % randi())


func _picture(file_name: String, size: Vector2i = Vector2i(8, 4)) -> Image:
	var image: Image = Image.create(size.x, size.y, false, Image.FORMAT_RGB8)
	image.fill(Color.FIREBRICK)
	var bytes: PackedByteArray
	match file_name.get_extension().to_lower():
		"png":
			bytes = image.save_png_to_buffer()
		"jpg", "jpeg":
			bytes = image.save_jpg_to_buffer()
		"webp":
			bytes = image.save_webp_to_buffer()
	_file(file_name, bytes)
	return image


func _file(file_name: String, bytes: PackedByteArray) -> void:
	FileAccess.open(_root.path_join(file_name), FileAccess.WRITE).store_buffer(bytes)


func test_every_picture_is_a_character_in_natural_order() -> void:
	for file_name: String in ["Santa10.png", "Santa2.jpg", "elf.webp", "Rudolph.JPEG"]:
		_picture(file_name)

	assert_array(FolderCharacters.picture_names(_root)).contains_exactly(
			["elf.webp", "Rudolph.JPEG", "Santa2.jpg", "Santa10.png"])


func test_other_and_hidden_files_are_left_out() -> void:
	_picture("Santa.png")
	_picture(".hidden.png")
	_file("notes.txt", "hello".to_utf8_buffer())
	_file("song.mp3", PackedByteArray([1, 2, 3]))
	DirAccess.make_dir_absolute(_root.path_join("more.png"))

	assert_array(FolderCharacters.picture_names(_root)).contains_exactly(["Santa.png"])


func test_missing_folder_has_no_characters() -> void:
	assert_array(FolderCharacters.picture_names(_root.path_join("gone"))).is_empty()


func test_load_list_gives_the_names() -> void:
	_picture("Santa.png")
	_picture("Elf.png")
	var names: Array = []

	FolderCharacters.new(_root).load_list(func(list: Array[String]) -> void: names.assign(list))

	assert_array(names).contains_exactly(["Elf.png", "Santa.png"])


func test_fetch_image_reads_the_picture() -> void:
	_picture("Santa.webp", Vector2i(20, 10))
	var pictures: Array[Image] = []

	FolderCharacters.new(_root).fetch_image("Santa.webp",
			func(picture: Image) -> void: pictures.append(picture))

	assert_int(pictures.size()).is_equal(1)
	assert_vector(Vector2(pictures[0].get_size())).is_equal(Vector2(20, 10))


func test_fetch_image_of_a_missing_or_broken_picture_gives_nothing() -> void:
	_file("Broken.png", "not a picture".to_utf8_buffer())
	var pictures: Array[Image] = []
	var characters: FolderCharacters = FolderCharacters.new(_root)

	characters.fetch_image("Gone.png", func(picture: Image) -> void: pictures.append(picture))
	characters.fetch_image("Broken.png", func(picture: Image) -> void: pictures.append(picture))

	assert_array(pictures).is_empty()


func test_names_cannot_reach_outside_the_folder() -> void:
	var outside: String = _root.get_base_dir().path_join("outside_%d.png" % randi())
	FileAccess.open(outside, FileAccess.WRITE).store_buffer(
			Image.create(4, 4, false, Image.FORMAT_RGB8).save_png_to_buffer())
	var pictures: Array[Image] = []

	FolderCharacters.new(_root).fetch_image("../" + outside.get_file(),
			func(picture: Image) -> void: pictures.append(picture))

	DirAccess.remove_absolute(outside)
	assert_array(pictures).is_empty()