import * as plugins from './smartbucket.plugins.js';
import { Directory } from './smartbucket.classes.directory.js';

export interface IFileMetaData {
  name: string;
  fileType: string;
  size: string;
}

/**
 * represents a file in a directory
 */
export class File {
  // STATIC

  /**
   * creates a file in draft mode
   * you need to call .save() to store it in s3
   * @param optionsArg
   */
  public static async create(optionsArg: {
    directory: Directory;
    name: string;
    contents: Buffer | string | plugins.stream.Readable;
    /**
     * if contents are of type string, you can specify the encoding here
     */
    encoding?: 'utf8' | 'binary';
  }): Promise<File> {
    const contents =
      typeof optionsArg.contents === 'string'
        ? Buffer.from(optionsArg.contents, optionsArg.encoding)
        : optionsArg.contents;
    const file = new File({
      directoryRefArg: optionsArg.directory,
      fileName: optionsArg.name,
    });
    if (contents instanceof plugins.stream.Readable) {} else {
      await optionsArg.directory.fastPut({
        path: optionsArg.name,
        contents: contents,
      });
    }
    return file;
  }

  // INSTANCE
  public parentDirectoryRef: Directory;
  public name: string;

  public path: string;
  public metaData: IFileMetaData;

  constructor(optionsArg: { directoryRefArg: Directory; fileName: string }) {
    this.parentDirectoryRef = optionsArg.directoryRefArg;
    this.name = optionsArg.fileName;
  }

  public async getContentAsString() {
    const fileBuffer = await this.getContentAsBuffer();
    return fileBuffer.toString();
  }

  public async getContentAsBuffer() {
    const done = plugins.smartpromise.defer();
    const fileStream = await this.parentDirectoryRef.bucketRef.smartbucketRef.minioClient
      .getObject(this.parentDirectoryRef.bucketRef.name, this.path)
      .catch((e) => console.log(e));
    let completeFile = Buffer.from('');
    const duplexStream = new plugins.smartstream.SmartDuplex<Buffer, Buffer>(
      {
        writeFunction: async (chunk) => {
          completeFile = Buffer.concat([chunk]);
          return chunk;
        },
        finalFunction: async (cb) => {
          done.resolve();
          return Buffer.from('');
        },
      }
    );

    if (!fileStream) {
      return null;
    }

    fileStream.pipe(duplexStream);
    await done.promise;
    return completeFile;
  }

  public async readStreaming() {
    // TODO
    throw new Error('not yet implemented');
  }

  /**
   * removes this file
   */
  public async remove() {
    await this.parentDirectoryRef.bucketRef.smartbucketRef.minioClient.removeObject(
      this.parentDirectoryRef.bucketRef.name,
      this.path
    );
    await this.parentDirectoryRef.listFiles();
  }

  /**
   * deletes the file
   */
  public async delete() {}

  /**
   * allows locking the file
   * @param optionsArg
   */
  public async lock(optionsArg?: { timeoutMillis?: number }) {}

  /**
   * actively unlocks a file
   *
   */
  public async unlock(optionsArg?: {
    /**
     * unlock the file even if not locked from this instance
     */
    force?: boolean;
  }) {}

  public async updateWithContents(optionsArg: {
    contents: Buffer | string | plugins.stream.Readable;
    encoding?: 'utf8' | 'binary';
  }) {}

  /**
   * allows updating the metadata of a file
   * @param updatedMetadata
   */
  public async updateMetaData(updatedMetadata: any) {}
}