// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * This application demonstrates how to perform basic operations on files with
 * the Google Cloud Storage API.
 *
 * For more information, see the README.md under /storage and the documentation
 * at https://cloud.google.com/storage/docs.
 */

function main(
  bucketName = 'my-bucket',
  srcFileName = 'test.txt',
  destFileName = 'test2.txt',
  destinationGenerationMatchPrecondition = 0
) {
  // [START storage_move_file]
  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // The ID of your GCS bucket
  // const bucketName = 'your-source-bucket';

  // The ID of your GCS file
  // const srcFileName = 'your-file-name';

  // The new ID for your GCS file
  // const destFileName = 'your-new-file-name';

  // Imports the Google Cloud client library
  const {Storage} = require('@google-cloud/storage');

  // Creates a client
  const storage = new Storage();

  async function moveFile() {
    // Optional:
    // Set a generation-match precondition to avoid potential race conditions
    // and data corruptions. The request to copy is aborted if the object's
    // generation number does not match your precondition. For a destination
    // object that does not yet exist, set the ifGenerationMatch precondition to 0
    // If the destination object already exists in your bucket, set instead a
    // generation-match precondition using its generation number.
    const moveOptions = {
      preconditionOpts: {
        ifGenerationMatch: destinationGenerationMatchPrecondition,
      },
    };

    // Moves the file within the bucket
    await storage
      .bucket(bucketName)
      .file(srcFileName)
      .move(destFileName, moveOptions);

    console.log(
      `gs://${bucketName}/${srcFileName} moved to gs://${bucketName}/${destFileName}`
    );
  }

  moveFile().catch(console.error);
  // [END storage_move_file]
}
main(...process.argv.slice(2));