'use strict';

const BbPromise = require('bluebird');

module.exports = {
  setServerlessDeploymentBucketName() {
    return this.sdk.getServerlessDeploymentBucketName(this.options.stage, this.options.region)
      .then((bucketName) => {
        this.bucketName = bucketName;
      });
  },

  listObjects() {
    this.objectsInBucket = [];

    this.serverless.cli.log('Getting all objects in S3 bucket...');
    const serviceStage = `${this.serverless.service.service}/${this.options.stage}`;
    return this.sdk.request('S3', 'listObjectsV2', {
      Bucket: this.bucketName,
      Prefix: `serverless/${serviceStage}`,
    }, this.options.stage, this.options.region).then((result) => {
      if (result) {
        result.Contents.forEach((object) => {
          this.objectsInBucket.push({
            Key: object.Key,
          });
        });
      }
      return BbPromise.resolve();
    });
  },

  deleteObjects() {
    this.serverless.cli.log('Removing objects in S3 bucket...');
    if (this.objectsInBucket.length) {
      return this.sdk.request('S3', 'deleteObjects', {
        Bucket: this.bucketName,
        Delete: {
          Objects: this.objectsInBucket,
        },
      }, this.options.stage, this.options.region);
    }

    return BbPromise.resolve();
  },

  emptyS3Bucket() {
    return BbPromise.bind(this)
      .then(this.setServerlessDeploymentBucketName)
      .then(this.listObjects)
      .then(this.deleteObjects);
  },
};