extends GdUnitTestSuite
## The whole look comes from the project theme, themes/main_theme.tres: scenes and
## scripts name its styles instead of setting colours, sizes or style boxes themselves.

const THEME_PATH: String = "res://themes/main_theme.tres"

## Folders with the game's scenes and scripts.
const GAME_FOLDERS: Array[String] = [
	"res://main", "res://quiz", "res://player", "res://popups", "res://common", "res://data",
	"res://server", "res://statistics",
]

## The named styles the game uses, and the type each one is based on.
const STYLES: Dictionary = {
	"WindowBackground": "Panel",
	"PopupBackground": "Panel",
	"DarkSpacer": "Panel",
	"CharacterCard": "Panel",
	"MusicList": "PanelContainer",
	"SongRow": "PanelContainer",
	"ShortcutRowDark": "PanelContainer",
	"ListRowEven": "PanelContainer",
	"ListRowOdd": "PanelContainer",
	"TitleLarge": "Label",
	"TitleMedium": "Label",
	"Title": "Label",
	"TextLarge": "Label",
	"TextMedium": "Label",
	"HighlightLarge": "Label",
	"HighlightMedium": "Label",
	"SongRowLabel": "Label",
	"SongRowLabelPlaying": "Label",
	"StatisticsCard": "PanelContainer",
	"StatisticsCardHover": "PanelContainer",
	"StatisticsGrid": "GridContainer",
	"TabButton": "Button",
}

var _theme: Theme = load(THEME_PATH)


## Every file in [param folder] and its subfolders whose name ends with [param extension].
func _files(folder: String, extension: String) -> Array[String]:
	var found: Array[String] = []
	for file_name: String in DirAccess.get_files_at(folder):
		if file_name.ends_with(extension):
			found.append(folder.path_join(file_name))
	for subfolder: String in DirAccess.get_directories_at(folder):
		found.append_array(_files(folder.path_join(subfolder), extension))
	return found


func _game_files(extension: String) -> Array[String]:
	var found: Array[String] = []
	for folder: String in GAME_FOLDERS:
		found.append_array(_files(folder, extension))
	return found


func _lines_matching(files: Array[String], pattern: String) -> Array[String]:
	var regex: RegEx = RegEx.create_from_string(pattern)
	var hits: Array[String] = []
	for path: String in files:
		var lines: PackedStringArray = FileAccess.get_file_as_string(path).split("\n")
		for i: int in lines.size():
			if regex.search(lines[i]) != null:
				hits.append("%s:%d: %s" % [path, i + 1, lines[i].strip_edges()])
	return hits


func test_project_uses_the_main_theme() -> void:
	assert_str(ProjectSettings.get_setting("gui/theme/custom")).is_equal(THEME_PATH)


func test_theme_has_every_named_style() -> void:
	for style: String in STYLES:
		assert_str(String(_theme.get_type_variation_base(style))) \
				.override_failure_message(style + " is missing or has the wrong base") \
				.is_equal(STYLES[style])


func test_theme_has_the_palette() -> void:
	assert_bool(_theme.has_color("backdrop", "Palette")).is_true()


func test_every_style_named_in_scenes_and_scripts_exists() -> void:
	var regex: RegEx = RegEx.create_from_string('&"([A-Z][A-Za-z]+)"')
	var missing: Array[String] = []
	for path: String in _game_files(".tscn") + _game_files(".gd"):
		for found: RegExMatch in regex.search_all(FileAccess.get_file_as_string(path)):
			var style: String = found.get_string(1)
			if !(style in STYLES) && style != "Palette":
				missing.append("%s: %s" % [path, style])
	assert_array(missing).override_failure_message(
			"Styles not in the theme:\n" + "\n".join(missing)).is_empty()


func test_scenes_take_their_look_from_the_theme() -> void:
	var hits: Array[String] = _lines_matching(_game_files(".tscn"),
			"^(theme = |label_settings = |theme_override_(styles|colors|font_sizes|fonts)/)" \
			+ "|^\\[sub_resource type=\"(StyleBoxFlat|LabelSettings|Theme)\"")
	assert_array(hits).override_failure_message(
			"Look set in a scene instead of the theme:\n" + "\n".join(hits)).is_empty()


func test_scripts_take_their_look_from_the_theme() -> void:
	var hits: Array[String] = _lines_matching(_game_files(".gd"),
			"add_theme_[a-z_]+_override|StyleBoxFlat\\.new|Color\\(")
	assert_array(hits).override_failure_message(
			"Look set in a script instead of the theme:\n" + "\n".join(hits)).is_empty()


func test_main_window_background_comes_from_the_theme_and_lets_clicks_through() -> void:
	var main: Control = auto_free(load("res://main/MainWindow.tscn").instantiate())
	var background: Panel = main.get_child(0)

	assert_str(background.name).is_equal("Background")
	assert_str(String(background.theme_type_variation)).is_equal("WindowBackground")
	assert_int(background.mouse_filter).is_equal(Control.MOUSE_FILTER_IGNORE)
	assert_float(background.anchor_right).is_equal(1.0)
	assert_float(background.anchor_bottom).is_equal(1.0)


func test_default_font_shows_japanese() -> void:
	var font: Font = _theme.default_font
	for character: String in "幕開けミッション":
		var found: bool = font.fallbacks.any(
				func(fallback: Font) -> bool: return fallback.has_char(character.unicode_at(0)))
		assert_bool(found).override_failure_message("No font has " + character).is_true()


func test_japanese_fallback_keeps_the_line_height_of_godots_font() -> void:
	var builtin: Font = ThemeDB.get_default_theme().default_font
	for size: int in [16, 18, 20, 25, 35, 50]:
		assert_float(_theme.default_font.get_height(size)) \
				.override_failure_message("Line height at size %d" % size) \
				.is_equal(builtin.get_height(size))