/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const lazy = {};

ChromeUtils.defineESModuleGetters(lazy, {
  BackupService: "resource:///modules/backup/BackupService.sys.mjs",
  ERRORS: "chrome://browser/content/backup/backup-constants.mjs",
});

ChromeUtils.defineLazyGetter(lazy, "logConsole", function () {
  return console.createInstance({
    prefix: "BackupUIParent",
    maxLogLevel: Services.prefs.getBoolPref("browser.backup.log", false)
      ? "Debug"
      : "Warn",
  });
});

/**
 * A JSWindowActor that is responsible for marshalling information between
 * the BackupService singleton and any registered UI widgets that need to
 * represent data from that service.
 */
export class BackupUIParent extends JSWindowActorParent {
  /**
   * A reference to the BackupService singleton instance.
   *
   * @type {BackupService}
   */
  #bs;

  /**
   * Create a BackupUIParent instance. If a BackupUIParent is instantiated
   * before BrowserGlue has a chance to initialize the BackupService, this
   * constructor will cause it to initialize first.
   */
  constructor() {
    super();
    // We use init() rather than get(), since it's possible to load
    // about:preferences before the service has had a chance to init itself
    // via BrowserGlue.
    this.#bs = lazy.BackupService.init();
  }

  /**
   * Called once the BackupUIParent/BackupUIChild pair have been connected.
   */
  actorCreated() {
    this.#bs.addEventListener("BackupService:StateUpdate", this);
    // Note that loadEncryptionState is an async function.
    // This function is no-op if the encryption state was already loaded.
    this.#bs.loadEncryptionState();
  }

  /**
   * Called once the BackupUIParent/BackupUIChild pair have been disconnected.
   */
  didDestroy() {
    this.#bs.removeEventListener("BackupService:StateUpdate", this);
  }

  /**
   * Handles events fired by the BackupService.
   *
   * @param {Event} event
   *   The event that the BackupService emitted.
   */
  handleEvent(event) {
    if (event.type == "BackupService:StateUpdate") {
      this.sendState();
    }
  }

  /**
   * Handles messages sent by BackupUIChild.
   *
   * @param {ReceiveMessageArgument} message
   *   The message received from the BackupUIChild.
   * @returns {
   *   null |
   *   {success: boolean, errorCode: number} |
   *   {path: string, fileName: string, iconURL: string|null}
   * }
   *   Returns either a success object, a file details object, or null.
   */
  async receiveMessage(message) {
    if (message.name == "RequestState") {
      this.sendState();
    } else if (message.name == "EnableScheduledBackups") {
      try {
        let { parentDirPath, password } = message.data;
        if (parentDirPath) {
          this.#bs.setParentDirPath(parentDirPath);
        }
        if (password) {
          await this.#bs.enableEncryption(password);
          Glean.browserBackup.passwordAdded.record();
        }
        this.#bs.setScheduledBackups(true);
      } catch (e) {
        lazy.logConsole.error(`Failed to enable scheduled backups`, e);
        return { success: false, errorCode: e.cause || lazy.ERRORS.UNKNOWN };
      }
      /**
       * TODO: (Bug 1900125) we should create a backup at the specified dir path once we turn on
       * scheduled backups. The backup folder in the chosen directory should contain
       * the archive file, which we create using BackupService.createArchive implemented in
       * Bug 1897498.
       */
      return { success: true };
    } else if (message.name == "DisableScheduledBackups") {
      try {
        if (this.#bs.state.encryptionEnabled) {
          await this.#bs.disableEncryption();
        }
        await this.#bs.deleteLastBackup();
      } catch (e) {
        // no-op so that scheduled backups can still be turned off
      }
      this.#bs.setScheduledBackups(false);
    } else if (message.name == "ShowFilepicker") {
      let { win, filter, displayDirectoryPath } = message.data;

      let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);

      let mode = filter
        ? Ci.nsIFilePicker.modeOpen
        : Ci.nsIFilePicker.modeGetFolder;
      fp.init(win, "", mode);

      if (filter) {
        fp.appendFilters(Ci.nsIFilePicker[filter]);
      }

      if (displayDirectoryPath) {
        try {
          let exists = await IOUtils.exists(displayDirectoryPath);
          if (exists) {
            fp.displayDirectory = await IOUtils.getFile(displayDirectoryPath);
          }
        } catch (_) {
          // If the file can not be found we will skip setting the displayDirectory.
        }
      }

      let result = await new Promise(resolve => fp.open(resolve));

      if (result === Ci.nsIFilePicker.returnCancel) {
        return null;
      }

      let path = fp.file.path;
      let iconURL = this.#bs.getIconFromFilePath(path);
      let filename = PathUtils.filename(path);

      return {
        path,
        filename,
        iconURL,
      };
    } else if (message.name == "GetBackupFileInfo") {
      let { backupFile } = message.data;
      try {
        await this.#bs.getBackupFileInfo(backupFile);
      } catch (e) {
        /**
         * TODO: (Bug 1905156) display a localized version of error in the restore dialog.
         */
      }
    } else if (message.name == "RestoreFromBackupChooseFile") {
      const window = this.browsingContext.topChromeWindow;
      this.#bs.filePickerForRestore(window);
    } else if (message.name == "RestoreFromBackupFile") {
      let { backupFile, backupPassword } = message.data;
      try {
        await this.#bs.recoverFromBackupArchive(
          backupFile,
          backupPassword,
          true /* shouldLaunch */
        );
      } catch (e) {
        lazy.logConsole.error(`Failed to restore file: ${backupFile}`, e);
        return { success: false, errorCode: e.cause || lazy.ERRORS.UNKNOWN };
      }
      return { success: true };
    } else if (message.name == "EnableEncryption") {
      try {
        await this.#bs.enableEncryption(message.data.password);
        Glean.browserBackup.passwordAdded.record();
      } catch (e) {
        lazy.logConsole.error(`Failed to enable encryption`, e);
        return { success: false, errorCode: e.cause || lazy.ERRORS.UNKNOWN };
      }
      /**
       * TODO: (Bug 1901640) after enabling encryption, recreate the backup,
       * this time with sensitive data.
       */
      return { success: true };
    } else if (message.name == "DisableEncryption") {
      try {
        await this.#bs.disableEncryption();
        Glean.browserBackup.passwordRemoved.record();
      } catch (e) {
        lazy.logConsole.error(`Failed to disable encryption`, e);
        return { success: false, errorCode: e.cause || lazy.ERRORS.UNKNOWN };
      }
      /**
       * TODO: (Bug 1901640) after disabling encryption, recreate the backup,
       * this time without sensitive data.
       */
      return { success: true };
    } else if (message.name == "RerunEncryption") {
      try {
        let { password } = message.data;

        await this.#bs.disableEncryption();
        await this.#bs.enableEncryption(password);
        Glean.browserBackup.passwordChanged.record();
      } catch (e) {
        lazy.logConsole.error(`Failed to rerun encryption`, e);
        return { success: false, errorCode: e.cause || lazy.ERRORS.UNKNOWN };
      }
      /**
       * TODO: (Bug 1901640) after enabling encryption, recreate the backup,
       * this time with the new password.
       */
      return { success: true };
    } else if (message.name == "ShowBackupLocation") {
      this.#bs.showBackupLocation();
    } else if (message.name == "EditBackupLocation") {
      const window = this.browsingContext.topChromeWindow;
      this.#bs.editBackupLocation(window);
    }

    return null;
  }

  /**
   * Sends the StateUpdate message to the BackupUIChild, along with the most
   * recent state object from BackupService.
   */
  sendState() {
    this.sendAsyncMessage("StateUpdate", { state: this.#bs.state });
  }
}