extends GdUnitTestSuite
## Checks that every node of the main window is where it was before the window was
## split into scenes.
##
## [code]tests/data/layout_baseline.json[/code] was written by
## [code]tools/take_screenshots.gd[/code] before the split. It holds the position, size
## and visibility of every node in each UiTour state, keyed by the node's old path. This
## test runs the same tour and compares, after moving each old path to where the node
## lives now.

const BASELINE_PATH: String = "res://tests/data/layout_baseline.json"

## Where each node of the old main window lives now: its old name, and the path that
## replaces it. Nodes that are not listed are still where they were.
const MOVED: Dictionary = {
	# The top bar
	"TopPanelContainer": "TopBar/TopPanelContainer",
	"Title": "TopBar/Title",
	"SearchButton": "TopBar/SearchButton",
	"SyncButton": "TopBar/SyncButton",
	"StatisticsButton": "TopBar/StatisticsButton",
	"ShortcutsButton": "TopBar/ShortcutsButton",
	"AboutButton": "TopBar/AboutButton",
	"QRButton": "TopBar/QRButton",
	# The popups of the main window, renamed from *Window to *Popup
	"Search": "SearchPopup",
	"SyncWindow": "SyncPopup",
	"QRWindow": "QRPopup",
	"ShortcutsWindow": "ShortcutsPopup",
	"AboutWindow": "AboutPopup",
	"Log": "LogPopup",
	# The quiz and its parts
	"Open": "Quiz/Open",
	"FileDialog": "Quiz/FileDialog",
	"DebugLabel": "Quiz/DebugLabel",
	"MusicListPanel": "Quiz/MusicListPanel",
	"Players": "Quiz/PlayersPanel",
	"ScrollContainer": "Quiz/InspirationList",
	"VBoxContainer": "Quiz/NowPlaying",
	"MusicPlayer": "Quiz/MusicPlayer/PlayerBar",
	"RepeatSongCheckButton": "Quiz/MusicPlayer/RepeatSongCheckButton",
	"ResetPlaylistButton": "Quiz/QuizToolbar/ResetPlaylistButton",
	"ResetPointsButton": "Quiz/QuizToolbar/ResetPointsButton",
	"SettingsButton": "Quiz/QuizToolbar/SettingsButton",
	"SoundTestButton": "Quiz/QuizToolbar/SoundTestButton",
	"ShowAnswerButton": "Quiz/SongControls/ShowAnswerButton",
	"NextButton": "Quiz/SongControls/NextButton",
	"SettingsWindow": "Quiz/SettingsPopup",
	"NewCharacterSelect": "Quiz/CharacterSelectPopup",
	"WinnerWindow": "Quiz/WinnerPopup",
}

## Scenes that were renamed, by their old and new root name. A row added to a list is
## named after its scene's root when the name is still free, so these show up deeper in a
## path.
const RENAMED_SCENES: Dictionary = {
	"SongListObject": "SongRow",
	"Player": "PlayerRow",
}

const SYNC_COLUMNS: String = "SyncPopup/SyncPanel/ScrollContainer/SyncVBoxContainer"

## Nodes renamed inside a popup: the path after the moves above, and the new path.
const RENAMED_PATHS: Dictionary = {
	"SearchPopup/ScrollContainer/VBoxContainer": "SearchPopup/ScrollContainer/SearchResults",
	SYNC_COLUMNS + "/CatchedErrorsVBox": SYNC_COLUMNS + "/CaughtErrorsVBox",
	SYNC_COLUMNS + "/CaughtErrorsVBox/CatchedErrorsLabel":
			SYNC_COLUMNS + "/CaughtErrorsVBox/CaughtErrorsLabel",
}

## How far a node may be from its old place, in pixels.
const TOLERANCE: float = 0.5

var _snapshot: AutoloadSnapshot
var _server: FakeHttpTransport
var _main: Control
var _layout: Dictionary = {}


func before() -> void:
	_snapshot = AutoloadSnapshot.take([Settings, Playlist])
	UiTour.prepare_autoloads()
	_server = UiTour.make_server().install()
	# Laid out at the size the baseline was taken at, like the screenshots
	var viewport: SubViewport = auto_free(SubViewport.new())
	viewport.size = Vector2i(1920, 1080)
	viewport.gui_embed_subwindows = true
	Engine.get_main_loop().root.add_child(viewport)
	_main = load("res://main/MainWindow.tscn").instantiate()
	viewport.add_child(_main)
	await UiTour.new(_main).run(func(state: String, popup: Node) -> void:
		_layout[state] = UiTour.dump_layout(_main, _main if popup == null else popup))


func after() -> void:
	_main.free()
	await Engine.get_main_loop().process_frame
	_server.uninstall()
	_snapshot.restore()


## Where the node that used to be at [param old_path] in the main window is now.
static func new_path(old_path: String) -> String:
	var parts: PackedStringArray = old_path.split("/")
	for i: int in parts.size():
		parts[i] = RENAMED_SCENES.get(parts[i], parts[i])
	var first: String = parts[0]
	parts[0] = MOVED.get(first, first)
	var path: String = "/".join(parts)
	# In order, so a node inside a renamed node is found after its parent's rename
	for renamed: String in RENAMED_PATHS:
		if path == renamed || path.begins_with(renamed + "/"):
			path = RENAMED_PATHS[renamed] + path.trim_prefix(renamed)
	return path


func _baseline() -> Dictionary:
	return JSON.parse_string(FileAccess.get_file_as_string(BASELINE_PATH))


func test_tour_has_the_same_states_as_the_baseline() -> void:
	assert_array(_layout.keys()).contains_exactly_in_any_order(_baseline().keys())


func test_every_node_is_where_it_was() -> void:
	var problems: Array[String] = []
	var baseline: Dictionary = _baseline()
	for state: String in baseline:
		var actual: Dictionary = _layout.get(state, {})
		for old_path: String in baseline[state]:
			var path: String = new_path(old_path)
			var expected: Dictionary = baseline[state][old_path]
			if !actual.has(path):
				problems.append("%s: %s is missing (was %s)" % [state, path, old_path])
				continue
			var rect: Array = actual[path].rect
			for i: int in 4:
				if absf(rect[i] - expected.rect[i]) > TOLERANCE:
					problems.append("%s: %s is at %s, was %s"
							% [state, path, rect, expected.rect])
					break
			if actual[path].visible != expected.visible:
				problems.append("%s: %s visible is %s, was %s"
						% [state, path, actual[path].visible, expected.visible])
	assert_array(problems).override_failure_message(
			"%d nodes moved:\n%s" % [problems.size(), "\n".join(problems.slice(0, 30))]) \
			.is_empty()