import * as plugins from './plugins.js';
import { Bucket } from './classes.bucket.js';
import { File } from './classes.file.js';

export class Directory {
  public bucketRef: Bucket;
  public parentDirectoryRef: Directory;
  public name: string;

  public tree: string[];
  public files: string[];
  public folders: string[];

  constructor(bucketRefArg: Bucket, parentDiretory: Directory, name: string) {
    this.bucketRef = bucketRefArg;
    this.parentDirectoryRef = parentDiretory;
    this.name = name;
  }

  /**
   * returns an array of parent directories
   */
  public getParentDirectories(): Directory[] {
    let parentDirectories: Directory[] = [];
    if (this.parentDirectoryRef) {
      parentDirectories.push(this.parentDirectoryRef);
      parentDirectories = parentDirectories.concat(this.parentDirectoryRef.getParentDirectories());
    }
    return parentDirectories;
  }

  /**
   * returns the directory level
   */
  public getDirectoryLevel(): number {
    return this.getParentDirectories().length;
  }

  /**
   * updates the base path
   */
  public getBasePath(): string {
    const parentDirectories = this.getParentDirectories();
    let basePath = '';
    for (const parentDir of parentDirectories) {
      if (!parentDir.name && !basePath) {
        basePath = this.name + '/';
        continue;
      }
      if (parentDir.name && !basePath) {
        basePath = parentDir.name + '/' + this.name + '/';
        continue;
      }
      if (parentDir.name && basePath) {
        basePath = parentDir.name + '/' + basePath;
        continue;
      }
    }
    return basePath;
  }

  /**
   * gets a file by name
   */
  public async getFile(optionsArg: {
    name: string;
    createWithContents?: string | Buffer;
  }): Promise<File> {
    // check wether the file exists
    const exists = await this.bucketRef.fastExists({
      path: this.getBasePath() + optionsArg.name,
    });
    if (!exists && !optionsArg.createWithContents) {
      return null;
    }
    if (!exists && optionsArg.createWithContents) {
      await File.create({
        directory: this,
        name: optionsArg.name,
        contents: optionsArg.createWithContents,
      });
    }
    return new File({
      directoryRefArg: this,
      fileName: optionsArg.name,
    })
  }

  /**
   * lists all files
   */
  public async listFiles(): Promise<File[]> {
    const done = plugins.smartpromise.defer();
    const fileNameStream = await this.bucketRef.smartbucketRef.minioClient.listObjectsV2(
      this.bucketRef.name,
      this.getBasePath(),
      false
    );
    const fileArray: File[] = [];
    const duplexStream = new plugins.smartstream.SmartDuplex<plugins.minio.BucketItem, void>({
      objectMode: true,
      writeFunction: async (bucketItem) => {
        if (bucketItem.prefix) {
          return;
        }
        if (!bucketItem.name) {
          return;
        }
        let subtractedPath = bucketItem.name.replace(this.getBasePath(), '');
        if (subtractedPath.startsWith('/')) {
          subtractedPath = subtractedPath.substr(1);
        }
        if (!subtractedPath.includes('/')) {
          fileArray.push(
            new File({
              directoryRefArg: this,
              fileName: subtractedPath,
            })
          );
        }
      },
      finalFunction: async (tools) => {
        done.resolve();
      }
    });
    fileNameStream.pipe(duplexStream);
    await done.promise;
    return fileArray;
  }

  /**
   * lists all folders
   */
  public async listDirectories(): Promise<Directory[]> {
    const done = plugins.smartpromise.defer();
    const basePath = this.getBasePath();
    const completeDirStream = await this.bucketRef.smartbucketRef.minioClient.listObjectsV2(
      this.bucketRef.name,
      this.getBasePath(),
      false
    );
    const directoryArray: Directory[] = [];
    const duplexStream = new plugins.smartstream.SmartDuplex<plugins.minio.BucketItem, void>({
      objectMode: true,
      writeFunction: async (bucketItem) => {
        if (bucketItem.name) {
          return;
        }
        let subtractedPath = bucketItem.prefix.replace(this.getBasePath(), '');
        if (subtractedPath.startsWith('/')) {
          subtractedPath = subtractedPath.substr(1);
        }
        if (subtractedPath.includes('/')) {
          const dirName = subtractedPath.split('/')[0];
          if (directoryArray.find((directory) => directory.name === dirName)) {
            return;
          }
          directoryArray.push(new Directory(this.bucketRef, this, dirName));
        }
      },
      finalFunction: async (tools) => {
        done.resolve();
      }
    });
    completeDirStream.pipe(duplexStream);
    await done.promise;
    return directoryArray;
  }

  /**
   * gets an array that has all objects with a certain prefix;
   */
  public async getTreeArray() {
    const treeArray = await this.bucketRef.smartbucketRef.minioClient.listObjectsV2(
      this.bucketRef.name,
      this.getBasePath(),
      true
    );
  }

  /**
   * gets a sub directory
   */
  public async getSubDirectoryByName(dirNameArg: string): Promise<Directory> {
    const dirNameArray = dirNameArg.split('/');

    const getDirectory = async (directoryArg: Directory, dirNameToSearch: string) => {
      const directories = await directoryArg.listDirectories();
      return directories.find((directory) => {
        return directory.name === dirNameToSearch;
      });
    };
    let wantedDirectory: Directory;
    for (const dirNameToSearch of dirNameArray) {
      const directoryToSearchIn = wantedDirectory ? wantedDirectory : this;
      wantedDirectory = await getDirectory(directoryToSearchIn, dirNameToSearch);
    }
    return wantedDirectory;
  }

  /**
   * moves the directory
   */
  public async move() {
    // TODO
    throw new Error('moving a directory is not yet implemented');
  }

  /**
   * creates a file within this directory
   * @param relativePathArg
   */
  public async createEmptyFile(relativePathArg: string) {
    const emtpyFile = await File.create({
      directory: this,
      name: relativePathArg,
      contents: '',
    });
  }

  // file operations
  public async fastPut(optionsArg: { path: string; contents: string | Buffer }) {
    const path = plugins.path.join(this.getBasePath(), optionsArg.path);
    await this.bucketRef.fastPut({
      path,
      contents: optionsArg.contents,
    });
  }

  public async fastGet(optionsArg: { path: string }) {
    const path = plugins.path.join(this.getBasePath(), optionsArg.path);
    const result = await this.bucketRef.fastGet({
      path,
    });
    return result;
  }

  public fastGetStream(optionsArg: {
    path: string;
  }, typeArg: 'webstream'): Promise<ReadableStream>
  public async fastGetStream(optionsArg: {
    path: string;
  }, typeArg: 'nodestream'): Promise<plugins.stream.Readable>

  /**
   * fastGetStream
   * @param optionsArg
   * @returns 
   */
  public async fastGetStream(optionsArg: { path: string; }, typeArg: 'webstream' | 'nodestream'): Promise<ReadableStream | plugins.stream.Readable>{
    const path = plugins.path.join(this.getBasePath(), optionsArg.path);
    const result = await this.bucketRef.fastGetStream({
      path
    }, typeArg as any);
    return result;
  }

  /**
   * fast put stream
   */
  public async fastPutStream(optionsArg: {
    path: string;
    stream: plugins.stream.Readable;
  }): Promise<void> {
    const path = plugins.path.join(this.getBasePath(), optionsArg.path);
    await this.bucketRef.fastPutStream({
      path,
      readableStream: optionsArg.stream,
    });
  }

  /**
   * removes a file within the directory
   * @param optionsArg
   */
  public async fastRemove(optionsArg: { path: string }) {
    const path = plugins.path.join(this.getBasePath(), optionsArg.path);
    await this.bucketRef.fastRemove({
      path,
    });
  }

  /**
   * deletes the directory with all its contents
   */
  public async delete() {
    const deleteDirectory = async (directoryArg: Directory) => {
      const childDirectories = await directoryArg.listDirectories();
      if (childDirectories.length === 0) {
        console.log('directory empty! Path complete!');
      } else {
        for (const childDir of childDirectories) {
          await deleteDirectory(childDir);
        }
      }
      const files = await directoryArg.listFiles();
      for (const file of files) {
        await directoryArg.fastRemove({
          path: file.name,
        });
      }
    };
    await deleteDirectory(this);
  }
}