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.bgm_player == null or scene.bgm_player.stream == null or scene.current_bgm_key != "menu":
		failures.append("title screen should start with an audible menu BGM stream")
	elif scene.bgm_player.volume_db < -12.0:
		failures.append("title menu BGM should be loud enough to hear by default: %.1fdb" % scene.bgm_player.volume_db)
	if scene._bgm_stream_for("battle") == null:
		failures.append("battle BGM stream should load before combat starts")
	for sfx_key in [
		"ui_click",
		"menu_confirm",
		"menu_cancel",
		"footstep",
		"slash",
		"bow_release",
		"hit_heavy",
		"guard_block",
		"skill_cast",
		"fire_skill",
		"item_pickup",
		"victory_sting",
		"defeat_sting"
	]:
		if scene._sfx_stream_for(sfx_key) == null:
			failures.append("SFX stream should load: %s" % sfx_key)
	if scene.title_background_texture_rect == null or scene.title_background_texture_rect.texture == null:
		failures.append("title screen should show a high-resolution battlefield backdrop")
	elif BattleSceneScript.TITLE_BACKGROUND_PATH == BattleSceneScript.DEFAULT_BATTLE_BACKGROUND_PATH:
		failures.append("title screen should use a dedicated cinematic background, not the first battle map backdrop")
	if scene.title_portrait_texture_rect == null or scene.title_portrait_texture_rect.texture == null:
		failures.append("title screen should show Cao Cao portrait art")
	if scene.title_panel == null or scene.title_panel.position.x > 100.0:
		failures.append("title menu panel should sit on the left side of the cinematic title screen")
	if scene.title_caption_label == null or scene.title_caption_label.text != "조조전":
		failures.append("title screen should present the campaign title in Korean")
	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_load_panel == null:
		failures.append("title screen should create a load-slot selection panel")
	elif scene.title_load_panel.visible:
		failures.append("load-slot selection panel should stay hidden until Game Load is pressed")
	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_start_button != null and scene.title_start_button.visible:
		failures.append("title settings should replace the main title commands while open")
	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 not scene._is_opening_prologue_visible():
		failures.append("starting a new campaign should show the opening prologue before briefing")
	if scene.briefing_panel != null and scene.briefing_panel.visible:
		failures.append("opening prologue should hold back the first briefing until advanced")
	if scene.opening_prologue_title_label == null or scene.opening_prologue_body_label == null:
		failures.append("opening prologue should expose title and story text")
	elif not scene.opening_prologue_body_label.text.contains("조조"):
		failures.append("opening prologue should first explain Cao Cao before the Yellow Turban battle")
	if scene.opening_prologue_step_label == null or not scene.opening_prologue_step_label.text.ends_with("/4"):
		failures.append("opening prologue should give Cao Cao, decision, Xiahou Dun, and Yingchuan their own beats")
	if scene.opening_prologue_scene_texture_rect == null or scene.opening_prologue_scene_texture_rect.texture == null:
		failures.append("opening prologue should show generated story artwork")
	elif scene.opening_prologue_scene_texture_rect.custom_minimum_size.x <= scene.opening_prologue_scene_texture_rect.custom_minimum_size.y:
		failures.append("opening prologue story artwork should use a wide cinematic frame")
	elif scene.opening_prologue_scene_texture_rect.custom_minimum_size.x < 1200 or scene.opening_prologue_scene_texture_rect.custom_minimum_size.y < 700:
		failures.append("opening prologue story artwork should fill the first screen instead of sitting in a small frame")
	if scene.opening_prologue_body_label != null and scene.opening_prologue_body_label.custom_minimum_size.x < 500:
		failures.append("opening prologue body text should have enough caption width for Korean copy")
	var first_story_texture: Texture2D = null
	if scene.opening_prologue_scene_texture_rect != null:
		first_story_texture = scene.opening_prologue_scene_texture_rect.texture
	scene._on_opening_prologue_next_pressed()
	if scene.opening_prologue_scene_texture_rect == null or scene.opening_prologue_scene_texture_rect.texture == first_story_texture:
		failures.append("opening prologue should change story artwork per page")
	if scene.opening_prologue_title_label == null or scene.opening_prologue_title_label.text != "맹덕의 결심":
		failures.append("opening prologue should move from Cao Cao background to his decision")
	elif not scene.opening_prologue_body_label.text.contains("황건") or not scene.opening_prologue_body_label.text.contains("작은 군세"):
		failures.append("opening prologue decision page should explain why Cao Cao raises troops")
	scene._on_opening_prologue_next_pressed()
	if scene.opening_prologue_title_label == null or scene.opening_prologue_title_label.text != "하후돈의 합류":
		failures.append("opening prologue should then show Xiahou Dun joining Cao Cao")
	elif not scene.opening_prologue_body_label.text.contains("하후돈") or not scene.opening_prologue_body_label.text.contains("첫 군령"):
		failures.append("opening prologue Xiahou Dun page should link the relationship to the first command")
	scene._on_opening_prologue_next_pressed()
	if scene.opening_prologue_title_label == null or scene.opening_prologue_title_label.text != "영천으로":
		failures.append("opening prologue should end by pointing toward Yingchuan")
	var prologue_guard := 0
	while scene._is_opening_prologue_visible() and prologue_guard < 8:
		scene._on_opening_prologue_next_pressed()
		prologue_guard += 1
	if scene._is_opening_prologue_visible():
		failures.append("opening prologue should close after advancing through its pages")
	if scene.briefing_panel == null or not scene.briefing_panel.visible:
		failures.append("finishing the opening prologue should enter the first briefing")
	if not scene.campaign_state.has_save():
		failures.append("starting a new game should create the main campaign save")
	if not scene.campaign_state.save_manual_game():
		failures.append("manual checkpoint should be writable for title load selection")

	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_load_panel == null or not scene.title_load_panel.visible:
		failures.append("Game Load should open a load-slot selection panel instead of loading immediately")
	if scene.title_start_button != null and scene.title_start_button.visible:
		failures.append("load-slot selection should replace the main title commands while open")
	if scene.title_load_auto_button == null or scene.title_load_auto_button.disabled:
		failures.append("load-slot selection should enable the automatic campaign save")
	elif not scene.title_load_auto_button.text.contains("자동 기록"):
		failures.append("automatic load slot should be labeled in Korean")
	if scene.title_load_manual_button == null or scene.title_load_manual_button.disabled:
		failures.append("load-slot selection should enable the manual checkpoint save")
	elif not scene.title_load_manual_button.text.contains("수동 봉인"):
		failures.append("manual load slot should be labeled in Korean")
	scene._show_title_menu()
	if scene.title_load_panel != null and scene.title_load_panel.visible:
		failures.append("showing the title menu again should reset the load-slot panel")
	scene._on_title_load_pressed()
	scene._on_title_load_back_pressed()
	if scene.title_load_panel != null and scene.title_load_panel.visible:
		failures.append("load-slot back should close the title load panel")
	scene._on_title_load_pressed()
	scene._on_title_load_auto_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._is_opening_prologue_visible():
		failures.append("loading a saved game should skip the new-campaign opening prologue")
	if scene.briefing_panel == null or not scene.briefing_panel.visible:
		failures.append("loading a saved game should enter the current campaign briefing")
	if scene.top_settings_button == null:
		failures.append("top toolbar should expose an in-game Settings icon")
	scene._on_settings_pressed()
	if scene.settings_panel == null or not scene.settings_panel.visible:
		failures.append("top Settings icon should open the in-game settings panel")
	if scene.settings_bgm_toggle == null or scene.settings_sfx_toggle == null or scene.settings_edge_scroll_toggle == null:
		failures.append("in-game settings panel should expose BGM, SFX, and edge-scroll toggles")
	if scene.settings_bgm_volume_slider == null or scene.settings_sfx_volume_slider == null:
		failures.append("in-game settings panel should expose BGM and SFX volume sliders")
	scene._on_settings_bgm_toggled(true)
	scene._on_settings_sfx_toggled(true)
	scene._on_settings_edge_scroll_toggled(true)
	scene._on_settings_bgm_volume_changed(70.0)
	scene._on_settings_sfx_volume_changed(60.0)
	if not scene.title_bgm_enabled or not scene.title_sfx_enabled or not scene.title_edge_scroll_enabled:
		failures.append("in-game settings toggles should update the shared settings state")
	if scene.title_bgm_volume_percent != 70 or scene.title_sfx_volume_percent != 60:
		failures.append("in-game settings sliders should update the shared volume state")
	scene._hide_settings_panel()
	scene._on_new_campaign_pressed()
	if not scene._is_opening_prologue_visible():
		failures.append("top New Campaign should also show the opening prologue")
	scene._on_opening_prologue_skip_pressed()
	if scene.briefing_panel == null or not scene.briefing_panel.visible:
		failures.append("skipping the top New Campaign prologue should enter the first 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