/**

 * Copyright (c) Meta Platforms, Inc. and affiliates.

 *

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

 *

 * @flow

 */

import 'regenerator-runtime/runtime';

import type {TimelineEvent} from '@elg/speedscope';

import type {ImportWorkerOutputData} from './index';

import preprocessData from './preprocessData';

import {readInputData} from './readInputData';

import InvalidProfileError from './InvalidProfileError';

export async function importFile(file: File): Promise<ImportWorkerOutputData> {

  try {

    const readFile = await readInputData(file);

    const events: TimelineEvent[] = JSON.parse(readFile);

    if (events.length === 0) {

      throw new InvalidProfileError('No profiling data found in file.');

    }

    const processedData = await preprocessData(events);

    return {

      status: 'SUCCESS',

      processedData,

    };

  } catch (error) {

    if (error instanceof InvalidProfileError) {

      return {

        status: 'INVALID_PROFILE_ERROR',

        error,

      };

    } else {

      return {

        status: 'UNEXPECTED_ERROR',

        error,

      };

    }

  }

}