import * as plugins from './plugins.js';
import type { IArchiveEntry, TCompressionLevel } from './interfaces.js';
import { GzipTools } from './classes.gziptools.js';

/**
 * TAR archive creation and extraction utilities
 */
export class TarTools {
  /**
   * Add a file to a TAR pack stream
   */
  public async addFileToPack(
    pack: plugins.tarStream.Pack,
    optionsArg: {
      fileName?: string;
      content?:
        | string
        | Buffer
        | plugins.stream.Readable
        | plugins.smartfile.SmartFile
        | plugins.smartfile.StreamFile;
      byteLength?: number;
      filePath?: string;
    }
  ): Promise<void> {
    return new Promise<void>(async (resolve, reject) => {
      let fileName: string | null = null;

      if (optionsArg.fileName) {
        fileName = optionsArg.fileName;
      } else if (optionsArg.content instanceof plugins.smartfile.SmartFile) {
        fileName = optionsArg.content.relative;
      } else if (optionsArg.content instanceof plugins.smartfile.StreamFile) {
        fileName = optionsArg.content.relativeFilePath;
      } else if (optionsArg.filePath) {
        fileName = optionsArg.filePath;
      }

      if (!fileName) {
        reject(new Error('No filename specified for TAR entry'));
        return;
      }

      // Determine content byte length
      let contentByteLength: number | undefined;
      if (optionsArg.byteLength) {
        contentByteLength = optionsArg.byteLength;
      } else if (typeof optionsArg.content === 'string') {
        contentByteLength = Buffer.byteLength(optionsArg.content, 'utf8');
      } else if (Buffer.isBuffer(optionsArg.content)) {
        contentByteLength = optionsArg.content.length;
      } else if (optionsArg.content instanceof plugins.smartfile.SmartFile) {
        contentByteLength = await optionsArg.content.getSize();
      } else if (optionsArg.content instanceof plugins.smartfile.StreamFile) {
        contentByteLength = await optionsArg.content.getSize();
      } else if (optionsArg.filePath) {
        const fileStat = await plugins.fsPromises.stat(optionsArg.filePath);
        contentByteLength = fileStat.size;
      }

      // Convert all content types to Readable stream
      let content: plugins.stream.Readable;
      if (Buffer.isBuffer(optionsArg.content)) {
        content = plugins.stream.Readable.from(optionsArg.content);
      } else if (typeof optionsArg.content === 'string') {
        content = plugins.stream.Readable.from(Buffer.from(optionsArg.content));
      } else if (optionsArg.content instanceof plugins.smartfile.SmartFile) {
        content = plugins.stream.Readable.from(optionsArg.content.contents);
      } else if (optionsArg.content instanceof plugins.smartfile.StreamFile) {
        content = await optionsArg.content.createReadStream();
      } else if (optionsArg.content instanceof plugins.stream.Readable) {
        content = optionsArg.content;
      } else if (optionsArg.filePath) {
        content = plugins.fs.createReadStream(optionsArg.filePath);
      } else {
        reject(new Error('No content or filePath specified for TAR entry'));
        return;
      }

      const entry = pack.entry(
        {
          name: fileName,
          ...(contentByteLength !== undefined ? { size: contentByteLength } : {}),
        },
        (err: Error | null) => {
          if (err) {
            reject(err);
          } else {
            resolve();
          }
        }
      );

      content.pipe(entry);
      // Note: resolve() is called in the callback above when pipe completes
    });
  }

  /**
   * Pack a directory into a TAR stream
   */
  public async packDirectory(directoryPath: string): Promise<plugins.tarStream.Pack> {
    const fileTree = await plugins.listFileTree(directoryPath, '**/*');
    const pack = await this.getPackStream();

    for (const filePath of fileTree) {
      const absolutePath = plugins.path.join(directoryPath, filePath);
      const fileStat = await plugins.fsPromises.stat(absolutePath);
      await this.addFileToPack(pack, {
        byteLength: fileStat.size,
        filePath: absolutePath,
        fileName: filePath,
        content: plugins.fs.createReadStream(absolutePath),
      });
    }

    return pack;
  }

  /**
   * Get a new TAR pack stream
   */
  public async getPackStream(): Promise<plugins.tarStream.Pack> {
    return plugins.tarStream.pack();
  }

  /**
   * Get a TAR extraction stream
   */
  public getDecompressionStream(): plugins.tarStream.Extract {
    return plugins.tarStream.extract();
  }

  /**
   * Pack files into a TAR buffer
   */
  public async packFiles(files: IArchiveEntry[]): Promise<Buffer> {
    const pack = await this.getPackStream();

    for (const file of files) {
      await this.addFileToPack(pack, {
        fileName: file.archivePath,
        content: file.content as string | Buffer | plugins.stream.Readable | plugins.smartfile.SmartFile | plugins.smartfile.StreamFile,
        byteLength: file.size,
      });
    }

    pack.finalize();

    const chunks: Buffer[] = [];
    return new Promise((resolve, reject) => {
      pack.on('data', (chunk: Buffer) => chunks.push(chunk));
      pack.on('end', () => resolve(Buffer.concat(chunks)));
      pack.on('error', reject);
    });
  }

  /**
   * Pack a directory into a TAR.GZ buffer
   */
  public async packDirectoryToTarGz(
    directoryPath: string,
    compressionLevel?: TCompressionLevel
  ): Promise<Buffer> {
    const pack = await this.packDirectory(directoryPath);
    pack.finalize();

    const gzipTools = new GzipTools();
    const gzipStream = gzipTools.getCompressionStream(compressionLevel);

    const chunks: Buffer[] = [];
    return new Promise((resolve, reject) => {
      pack
        .pipe(gzipStream)
        .on('data', (chunk: Buffer) => chunks.push(chunk))
        .on('end', () => resolve(Buffer.concat(chunks)))
        .on('error', reject);
    });
  }

  /**
   * Pack a directory into a TAR.GZ stream
   */
  public async packDirectoryToTarGzStream(
    directoryPath: string,
    compressionLevel?: TCompressionLevel
  ): Promise<plugins.stream.Readable> {
    const pack = await this.packDirectory(directoryPath);
    pack.finalize();

    const gzipTools = new GzipTools();
    const gzipStream = gzipTools.getCompressionStream(compressionLevel);

    return pack.pipe(gzipStream);
  }

  /**
   * Pack files into a TAR.GZ buffer
   */
  public async packFilesToTarGz(
    files: IArchiveEntry[],
    compressionLevel?: TCompressionLevel
  ): Promise<Buffer> {
    const tarBuffer = await this.packFiles(files);
    const gzipTools = new GzipTools();
    return gzipTools.compress(tarBuffer, compressionLevel);
  }
}