extends SceneTree

const BattleSceneScript := preload("res://scripts/scenes/battle_scene.gd")

const SAVE_PATH := "user://campaign_save.json"
const MANUAL_SAVE_PATH := "user://campaign_manual_save.json"
const SETTINGS_PATH := "user://heros_settings.json"


func _init() -> void:
	var save_backup := _backup_user_file(SAVE_PATH)
	var manual_backup := _backup_user_file(MANUAL_SAVE_PATH)
	var settings_backup := _backup_user_file(SETTINGS_PATH)
	var failures: Array[String] = []
	_clear_user_file(SAVE_PATH)
	_clear_user_file(MANUAL_SAVE_PATH)
	_clear_user_file(SETTINGS_PATH)

	_check_title_menu_start_load_and_settings(failures)

	if not _restore_user_file(SAVE_PATH, save_backup):
		failures.append("could not restore campaign save after title menu smoke")
	if not _restore_user_file(MANUAL_SAVE_PATH, manual_backup):
		failures.append("could not restore manual campaign save after title menu smoke")
	if not _restore_user_file(SETTINGS_PATH, settings_backup):
		failures.append("could not restore title settings after title menu smoke")

	if failures.is_empty():
		print("title menu smoke ok")
		quit(0)
		return

	for failure in failures:
		push_error(failure)
	quit(1)


func _check_title_menu_start_load_and_settings(failures: Array[String]) -> void:
	var scene = BattleSceneScript.new()
	scene._ready()

	if scene.title_screen_root == null or not scene.title_screen_root.visible:
		failures.append("title screen should be visible on startup")
	if scene.briefing_panel == null or scene.briefing_panel.visible:
		failures.append("briefing should stay hidden behind the title screen")
	if scene.title_start_button == null or scene.title_start_button.text != "처음부터 시작":
		failures.append("title screen should expose Start from Beginning")
	if scene.title_load_button == null or scene.title_load_button.text != "게임 로드":
		failures.append("title screen should expose Game Load")
	elif not scene.title_load_button.disabled:
		failures.append("Game Load should be disabled when no save exists")
	if scene.title_settings_button == null or scene.title_settings_button.text != "환경 설정":
		failures.append("title screen should expose Settings")

	scene._on_title_settings_pressed()
	if scene.title_settings_panel == null or not scene.title_settings_panel.visible:
		failures.append("title settings panel should open from the title screen")
	if scene.title_bgm_toggle == null or scene.title_sfx_toggle == null or scene.title_edge_scroll_toggle == null:
		failures.append("title settings should expose BGM, SFX, and edge-scroll toggles")
	if scene.title_bgm_volume_slider == null or scene.title_sfx_volume_slider == null:
		failures.append("title settings should expose BGM and SFX volume sliders")
	scene._on_title_bgm_toggled(false)
	if scene.title_bgm_enabled:
		failures.append("BGM toggle should disable background music")
	scene._on_title_bgm_volume_changed(45.0)
	if scene.title_bgm_volume_percent != 45:
		failures.append("BGM volume slider should update the saved BGM volume percent")
	scene._on_title_sfx_toggled(false)
	if scene.title_sfx_enabled:
		failures.append("SFX toggle should disable sound effects")
	scene._on_title_sfx_volume_changed(35.0)
	if scene.title_sfx_volume_percent != 35:
		failures.append("SFX volume slider should update the saved SFX volume percent")
	scene._on_title_edge_scroll_toggled(false)
	if scene.title_edge_scroll_enabled:
		failures.append("edge-scroll toggle should disable edge scrolling")
	if scene._update_edge_scroll(0.25):
		failures.append("edge scrolling should not move while disabled in settings")
	var persisted_scene = BattleSceneScript.new()
	persisted_scene._ready()
	if persisted_scene.title_bgm_enabled or persisted_scene.title_sfx_enabled or persisted_scene.title_edge_scroll_enabled:
		failures.append("title settings toggles should persist into a new scene instance")
	if persisted_scene.title_bgm_volume_percent != 45 or persisted_scene.title_sfx_volume_percent != 35:
		failures.append("title settings volume values should persist into a new scene instance")
	persisted_scene.free()
	scene._on_title_settings_back_pressed()
	if scene.title_settings_panel != null and scene.title_settings_panel.visible:
		failures.append("settings back should hide the title settings panel")

	scene._on_title_start_pressed()
	if scene.title_screen_root != null and scene.title_screen_root.visible:
		failures.append("starting a new game should hide the title screen")
	if scene.briefing_panel == null or not scene.briefing_panel.visible:
		failures.append("starting a new game should enter the first briefing")
	if not scene.campaign_state.has_save():
		failures.append("starting a new game should create the main campaign save")

	scene._show_title_menu()
	scene._update_title_menu_state()
	if scene.title_load_button == null or scene.title_load_button.disabled:
		failures.append("Game Load should become available after a campaign save exists")
	scene._on_title_load_pressed()
	if scene.title_screen_root != null and scene.title_screen_root.visible:
		failures.append("loading a saved game should hide the title screen")
	if scene.briefing_panel == null or not scene.briefing_panel.visible:
		failures.append("loading a saved game should enter the current campaign briefing")
	scene.free()


func _backup_user_file(path: String) -> Dictionary:
	if not FileAccess.file_exists(path):
		return {"exists": false, "text": ""}
	return {
		"exists": true,
		"text": FileAccess.get_file_as_string(path)
	}


func _restore_user_file(path: String, backup: Dictionary) -> bool:
	if bool(backup.get("exists", false)):
		var file := FileAccess.open(path, FileAccess.WRITE)
		if file == null:
			return false
		file.store_string(str(backup.get("text", "")))
		return true
	return _clear_user_file(path)


func _clear_user_file(path: String) -> bool:
	if not FileAccess.file_exists(path):
		return true
	return DirAccess.remove_absolute(ProjectSettings.globalize_path(path)) == OK