import { Construct } from 'constructs';
import kebabCase from 'lodash.kebabcase';
import { S3Bucket, S3BucketObject } from '../generated/providers/aws/s3';
import { getId } from '../utils';

export type EnvFileEntries = [string, string][];

const getEnvVarFileContentsFromEntries = (entries: EnvFileEntries) => {
  return entries.map(([key, value]) => `${key}=${value}`).join('\n');
};

/**
 * A bucket specifically for env variables for this service
 */
export default class EnvVarsBucket extends Construct {
  readonly bucketName: string;
  readonly arn: string;

  constructor(scope: Construct, id: string) {
    super(scope, id);
    const bucket = new S3Bucket(this, 'bucket', {
      bucket: kebabCase(getId('api', 'env')),
      acl: 'private',
      versioning: {
        enabled: true,
      },
      // @TODO: enable logging
    });
    this.bucketName = bucket.bucket;
    this.arn = bucket.arn;
  }
  private getFileKey(fileName: string): string {
    return `${fileName}.env`;
  }

  /**
   * Adds an .env file to this bucket
   * NOTE: Do not include .env ending in `fileName`
   * @returns {string} the resource arn
   */
  addEnvFile(fileName: string, entries: EnvFileEntries): string {
    const bucketObject = new S3BucketObject(this, fileName, {
      bucket: this.bucketName,
      key: this.getFileKey(fileName),
      content: getEnvVarFileContentsFromEntries(entries),
    });

    return `${this.arn}/${bucketObject.key}`;
  }
  /**
   * Create an env file but does not change it's contents, allowing someone
   * else (human or otherwise) to write to this env file.
   */
  ensureEnvFileExists(fileName: string): string {
    const bucketObject = new S3BucketObject(this, fileName, {
      bucket: this.bucketName,
      key: this.getFileKey(fileName),
      lifecycle: {
        ignoreChanges: ['content'],
      },
    });
    return `${this.arn}/${bucketObject.key}`;
  }
}