import * as plugins from './plugins.js';
import type {
  IArchiveEntry,
  IArchiveEntryInfo,
  IArchiveInfo,
  TArchiveFormat,
  TCompressionLevel,
  TEntryFilter,
} from './interfaces.js';

import { Bzip2Tools } from './classes.bzip2tools.js';
import { GzipTools } from './classes.gziptools.js';
import { TarTools } from './classes.tartools.js';
import { ZipTools } from './classes.ziptools.js';
import { ArchiveAnalyzer, type IAnalyzedResult } from './classes.archiveanalyzer.js';

/**
 * Pending directory entry for async resolution
 */
interface IPendingDirectory {
  sourcePath: string;
  archiveBase?: string;
}

/**
 * Main class for archive manipulation with fluent API
 * Supports TAR, ZIP, GZIP, and BZIP2 formats
 *
 * @example Extraction from URL
 * ```typescript
 * await SmartArchive.create()
 *   .url('https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz')
 *   .stripComponents(1)
 *   .extract('./node_modules/lodash');
 * ```
 *
 * @example Creation with thenable
 * ```typescript
 * const archive = await SmartArchive.create()
 *   .format('tar.gz')
 *   .compression(9)
 *   .entry('config.json', JSON.stringify(config))
 *   .directory('./src');
 * ```
 */
export class SmartArchive {
  // ============================================
  // STATIC ENTRY POINT
  // ============================================

  /**
   * Create a new SmartArchive instance for fluent configuration
   */
  public static create(): SmartArchive {
    return new SmartArchive();
  }

  // ============================================
  // TOOLS (public for internal use)
  // ============================================

  public tarTools = new TarTools();
  public zipTools = new ZipTools();
  public gzipTools = new GzipTools();
  public bzip2Tools = new Bzip2Tools(this);
  public archiveAnalyzer = new ArchiveAnalyzer(this);

  // ============================================
  // SOURCE STATE (extraction mode)
  // ============================================

  private sourceUrl?: string;
  private sourceFilePath?: string;
  private sourceStream?: plugins.stream.Readable | plugins.stream.Duplex | plugins.stream.Transform;

  // ============================================
  // CREATION STATE
  // ============================================

  private archiveBuffer?: Buffer;
  private creationFormat?: TArchiveFormat;
  private _compressionLevel: TCompressionLevel = 6;
  private pendingEntries: IArchiveEntry[] = [];
  private pendingDirectories: IPendingDirectory[] = [];

  // ============================================
  // FLUENT STATE
  // ============================================

  private _mode: 'extract' | 'create' | null = null;
  private _filters: TEntryFilter[] = [];
  private _excludePatterns: RegExp[] = [];
  private _includePatterns: RegExp[] = [];
  private _stripComponents: number = 0;
  private _overwrite: boolean = false;
  private _fileName?: string;

  constructor() {}

  // ============================================
  // SOURCE METHODS (set extraction mode)
  // ============================================

  /**
   * Load archive from URL
   */
  public url(urlArg: string): this {
    this.ensureNotInCreateMode('url');
    this._mode = 'extract';
    this.sourceUrl = urlArg;
    return this;
  }

  /**
   * Load archive from file path
   */
  public file(pathArg: string): this {
    this.ensureNotInCreateMode('file');
    this._mode = 'extract';
    this.sourceFilePath = pathArg;
    return this;
  }

  /**
   * Load archive from readable stream
   */
  public stream(streamArg: plugins.stream.Readable | plugins.stream.Duplex | plugins.stream.Transform): this {
    this.ensureNotInCreateMode('stream');
    this._mode = 'extract';
    this.sourceStream = streamArg;
    return this;
  }

  /**
   * Load archive from buffer
   */
  public buffer(bufferArg: Buffer): this {
    this.ensureNotInCreateMode('buffer');
    this._mode = 'extract';
    this.sourceStream = plugins.stream.Readable.from(bufferArg);
    return this;
  }

  // ============================================
  // FORMAT METHODS (set creation mode)
  // ============================================

  /**
   * Set output format for archive creation
   */
  public format(fmt: TArchiveFormat): this {
    this.ensureNotInExtractMode('format');
    this._mode = 'create';
    this.creationFormat = fmt;
    return this;
  }

  /**
   * Set compression level (0-9)
   */
  public compression(level: TCompressionLevel): this {
    this._compressionLevel = level;
    return this;
  }

  // ============================================
  // CONTENT METHODS (creation mode)
  // ============================================

  /**
   * Add a single file entry to the archive
   */
  public entry(archivePath: string, content: string | Buffer): this {
    this.ensureNotInExtractMode('entry');
    if (!this._mode) this._mode = 'create';
    this.pendingEntries.push({ archivePath, content });
    return this;
  }

  /**
   * Add multiple entries to the archive
   */
  public entries(entriesArg: Array<{ archivePath: string; content: string | Buffer }>): this {
    this.ensureNotInExtractMode('entries');
    if (!this._mode) this._mode = 'create';
    for (const e of entriesArg) {
      this.pendingEntries.push({ archivePath: e.archivePath, content: e.content });
    }
    return this;
  }

  /**
   * Add an entire directory to the archive (queued, resolved at build time)
   */
  public directory(sourcePath: string, archiveBase?: string): this {
    this.ensureNotInExtractMode('directory');
    if (!this._mode) this._mode = 'create';
    this.pendingDirectories.push({ sourcePath, archiveBase });
    return this;
  }

  /**
   * Add a SmartFile to the archive
   */
  public addSmartFile(fileArg: plugins.smartfile.SmartFile, archivePath?: string): this {
    this.ensureNotInExtractMode('addSmartFile');
    if (!this._mode) this._mode = 'create';
    this.pendingEntries.push({
      archivePath: archivePath || fileArg.relative,
      content: fileArg,
    });
    return this;
  }

  /**
   * Add a StreamFile to the archive
   */
  public addStreamFile(fileArg: plugins.smartfile.StreamFile, archivePath?: string): this {
    this.ensureNotInExtractMode('addStreamFile');
    if (!this._mode) this._mode = 'create';
    this.pendingEntries.push({
      archivePath: archivePath || fileArg.relativeFilePath,
      content: fileArg,
    });
    return this;
  }

  // ============================================
  // FILTER METHODS (both modes)
  // ============================================

  /**
   * Filter entries by predicate function
   */
  public filter(predicate: TEntryFilter): this {
    this._filters.push(predicate);
    return this;
  }

  /**
   * Include only entries matching the pattern
   */
  public include(pattern: string | RegExp): this {
    const regex = typeof pattern === 'string' ? new RegExp(pattern) : pattern;
    this._includePatterns.push(regex);
    return this;
  }

  /**
   * Exclude entries matching the pattern
   */
  public exclude(pattern: string | RegExp): this {
    const regex = typeof pattern === 'string' ? new RegExp(pattern) : pattern;
    this._excludePatterns.push(regex);
    return this;
  }

  // ============================================
  // EXTRACTION OPTIONS
  // ============================================

  /**
   * Strip N leading path components from extracted files
   */
  public stripComponents(n: number): this {
    this._stripComponents = n;
    return this;
  }

  /**
   * Overwrite existing files during extraction
   */
  public overwrite(value: boolean = true): this {
    this._overwrite = value;
    return this;
  }

  /**
   * Set output filename for single-file archives (gz, bz2)
   */
  public fileName(name: string): this {
    this._fileName = name;
    return this;
  }

  // ============================================
  // TERMINAL METHODS - EXTRACTION
  // ============================================

  /**
   * Extract archive to filesystem directory
   */
  public async extract(targetDir: string): Promise<void> {
    this.ensureExtractionSource();
    const done = plugins.smartpromise.defer<void>();
    const streamFileStream = await this.toStreamFiles();

    streamFileStream.pipe(
      new plugins.smartstream.SmartDuplex({
        objectMode: true,
        writeFunction: async (streamFileArg: plugins.smartfile.StreamFile) => {
          const innerDone = plugins.smartpromise.defer<void>();
          const streamFile = streamFileArg;
          let relativePath = streamFile.relativeFilePath || this._fileName || 'extracted_file';

          // Apply stripComponents
          if (this._stripComponents > 0) {
            const parts = relativePath.split('/');
            relativePath = parts.slice(this._stripComponents).join('/');
            if (!relativePath) {
              innerDone.resolve();
              return;
            }
          }

          // Apply filter
          const filterFn = this.buildFilterFunction();
          if (filterFn) {
            const entryInfo: IArchiveEntryInfo = {
              path: relativePath,
              size: 0,
              isDirectory: false,
              isFile: true,
            };
            if (!filterFn(entryInfo)) {
              innerDone.resolve();
              return;
            }
          }

          const readStream = await streamFile.createReadStream();
          await plugins.fsPromises.mkdir(targetDir, { recursive: true });
          const writePath = plugins.path.join(targetDir, relativePath);
          await plugins.fsPromises.mkdir(plugins.path.dirname(writePath), { recursive: true });
          const writeStream = plugins.fs.createWriteStream(writePath);
          readStream.pipe(writeStream);
          writeStream.on('finish', () => {
            innerDone.resolve();
          });
          await innerDone.promise;
        },
        finalFunction: async () => {
          done.resolve();
        },
      })
    );

    return done.promise;
  }

  /**
   * Extract archive to a stream of StreamFile objects
   */
  public async toStreamFiles(): Promise<plugins.smartstream.StreamIntake<plugins.smartfile.StreamFile>> {
    this.ensureExtractionSource();

    const streamFileIntake = new plugins.smartstream.StreamIntake<plugins.smartfile.StreamFile>({
      objectMode: true,
    });

    // Guard to prevent multiple signalEnd calls
    let hasSignaledEnd = false;
    const safeSignalEnd = () => {
      if (!hasSignaledEnd) {
        hasSignaledEnd = true;
        streamFileIntake.signalEnd();
      }
    };

    const archiveStream = await this.getSourceStream();
    const createAnalyzedStream = () => this.archiveAnalyzer.getAnalyzedStream();

    const createUnpackStream = () =>
      plugins.smartstream.createTransformFunction<IAnalyzedResult, void>(
        async (analyzedResultChunk) => {
          if (analyzedResultChunk.fileType?.mime === 'application/x-tar') {
            const tarStream = analyzedResultChunk.decompressionStream as plugins.tarStream.Extract;

            tarStream.on('entry', async (header, stream, next) => {
              if (header.type === 'directory') {
                stream.resume();
                stream.on('end', () => next());
                return;
              }

              const passThrough = new plugins.stream.PassThrough();
              const streamfile = plugins.smartfile.StreamFile.fromStream(passThrough, header.name);
              streamFileIntake.push(streamfile);
              stream.pipe(passThrough);
              stream.on('end', () => {
                passThrough.end();
                next();
              });
            });

            tarStream.on('finish', () => {
              safeSignalEnd();
            });

            analyzedResultChunk.resultStream.pipe(analyzedResultChunk.decompressionStream);
          } else if (analyzedResultChunk.fileType?.mime === 'application/zip') {
            analyzedResultChunk.resultStream
              .pipe(analyzedResultChunk.decompressionStream)
              .pipe(
                new plugins.smartstream.SmartDuplex({
                  objectMode: true,
                  writeFunction: async (streamFileArg: plugins.smartfile.StreamFile) => {
                    streamFileIntake.push(streamFileArg);
                  },
                  finalFunction: async () => {
                    safeSignalEnd();
                  },
                })
              );
          } else if (analyzedResultChunk.isArchive && analyzedResultChunk.decompressionStream) {
            // For nested archives (like gzip containing tar)
            analyzedResultChunk.resultStream
              .pipe(analyzedResultChunk.decompressionStream)
              .pipe(createAnalyzedStream())
              .pipe(createUnpackStream());
          } else {
            const streamFile = plugins.smartfile.StreamFile.fromStream(
              analyzedResultChunk.resultStream,
              analyzedResultChunk.fileType?.ext
            );
            streamFileIntake.push(streamFile);
            safeSignalEnd();
          }
        },
        { objectMode: true }
      );

    archiveStream.pipe(createAnalyzedStream()).pipe(createUnpackStream());
    return streamFileIntake;
  }

  /**
   * Extract archive to an array of SmartFile objects (in-memory)
   */
  public async toSmartFiles(): Promise<plugins.smartfile.SmartFile[]> {
    this.ensureExtractionSource();
    const streamFiles = await this.toStreamFiles();
    const smartFiles: plugins.smartfile.SmartFile[] = [];
    const filterFn = this.buildFilterFunction();
    const pendingConversions: Promise<void>[] = [];

    return new Promise((resolve, reject) => {
      streamFiles.on('data', (streamFile: plugins.smartfile.StreamFile) => {
        // Track all async conversions to ensure they complete before resolving
        const conversion = (async () => {
          try {
            const smartFile = await streamFile.toSmartFile();

            // Apply filter if configured
            if (filterFn) {
              const passes = filterFn({
                path: smartFile.relative,
                size: smartFile.contents.length,
                isDirectory: false,
                isFile: true,
              });
              if (!passes) return;
            }

            smartFiles.push(smartFile);
          } catch (err) {
            reject(err);
          }
        })();
        pendingConversions.push(conversion);
      });
      streamFiles.on('end', async () => {
        // Wait for all conversions to complete before resolving
        await Promise.all(pendingConversions);
        resolve(smartFiles);
      });
      streamFiles.on('error', reject);
    });
  }

  /**
   * Extract a single file from the archive by path
   */
  public async extractFile(filePath: string): Promise<plugins.smartfile.SmartFile | null> {
    this.ensureExtractionSource();
    const streamFiles = await this.toStreamFiles();

    return new Promise((resolve, reject) => {
      let found = false;

      streamFiles.on('data', async (streamFile: plugins.smartfile.StreamFile) => {
        if (streamFile.relativeFilePath === filePath || streamFile.relativeFilePath?.endsWith(filePath)) {
          found = true;
          try {
            const smartFile = await streamFile.toSmartFile();
            resolve(smartFile);
          } catch (err) {
            reject(err);
          }
        }
      });

      streamFiles.on('end', () => {
        if (!found) {
          resolve(null);
        }
      });

      streamFiles.on('error', reject);
    });
  }

  // ============================================
  // TERMINAL METHODS - OUTPUT
  // ============================================

  /**
   * Build and finalize the archive, returning this instance
   */
  public async build(): Promise<SmartArchive> {
    await this.doBuild();
    return this;
  }

  /**
   * Internal build implementation (avoids thenable recursion)
   */
  private async doBuild(): Promise<void> {
    if (this._mode === 'extract') {
      // For extraction mode, nothing to build
      return;
    }

    if (this.archiveBuffer) {
      // Already built
      return;
    }

    // For creation mode, build the archive buffer
    this.ensureCreationFormat();
    await this.resolveDirectories();

    const entries = this.getFilteredEntries();

    if (this.creationFormat === 'tar' || this.creationFormat === 'tar.gz' || this.creationFormat === 'tgz') {
      if (this.creationFormat === 'tar') {
        this.archiveBuffer = await this.tarTools.packFiles(entries);
      } else {
        this.archiveBuffer = await this.tarTools.packFilesToTarGz(entries, this._compressionLevel);
      }
    } else if (this.creationFormat === 'zip') {
      this.archiveBuffer = await this.zipTools.createZip(entries, this._compressionLevel);
    } else if (this.creationFormat === 'gz') {
      if (entries.length !== 1) {
        throw new Error('GZIP format only supports a single file');
      }
      let content: Buffer;
      if (typeof entries[0].content === 'string') {
        content = Buffer.from(entries[0].content);
      } else if (Buffer.isBuffer(entries[0].content)) {
        content = entries[0].content;
      } else {
        throw new Error('GZIP format requires string or Buffer content');
      }
      this.archiveBuffer = await this.gzipTools.compress(content, this._compressionLevel);
    } else {
      throw new Error(`Unsupported format: ${this.creationFormat}`);
    }
  }

  /**
   * Build archive and return as Buffer
   */
  public async toBuffer(): Promise<Buffer> {
    if (this._mode === 'create' && !this.archiveBuffer) {
      await this.doBuild();
    }

    if (this.archiveBuffer) {
      return this.archiveBuffer;
    }

    // For extraction mode, get the source as buffer
    const stream = await this.getSourceStream();
    return this.streamToBuffer(stream);
  }

  /**
   * Build archive and write to file
   */
  public async toFile(filePath: string): Promise<void> {
    const buffer = await this.toBuffer();
    await plugins.fsPromises.mkdir(plugins.path.dirname(filePath), { recursive: true });
    await plugins.fsPromises.writeFile(filePath, buffer);
  }

  /**
   * Get archive as a readable stream
   */
  public async toStream(): Promise<plugins.stream.Readable> {
    if (this._mode === 'create' && !this.archiveBuffer) {
      await this.doBuild();
    }

    if (this.archiveBuffer) {
      return plugins.stream.Readable.from(this.archiveBuffer);
    }

    return this.getSourceStream();
  }

  // ============================================
  // TERMINAL METHODS - ANALYSIS
  // ============================================

  /**
   * Analyze the archive and return metadata
   */
  public async analyze(): Promise<IArchiveInfo> {
    this.ensureExtractionSource();
    const stream = await this.getSourceStream();
    const firstChunk = await this.readFirstChunk(stream);
    const fileType = await plugins.fileType.fileTypeFromBuffer(firstChunk);

    let format: TArchiveFormat | null = null;
    let isCompressed = false;
    let isArchive = false;

    if (fileType) {
      switch (fileType.mime) {
        case 'application/gzip':
          format = 'gz';
          isCompressed = true;
          isArchive = true;
          break;
        case 'application/zip':
          format = 'zip';
          isCompressed = true;
          isArchive = true;
          break;
        case 'application/x-tar':
          format = 'tar';
          isArchive = true;
          break;
        case 'application/x-bzip2':
          format = 'bz2';
          isCompressed = true;
          isArchive = true;
          break;
      }
    }

    return {
      format,
      isCompressed,
      isArchive,
    };
  }

  /**
   * List all entries in the archive
   */
  public async list(): Promise<IArchiveEntryInfo[]> {
    this.ensureExtractionSource();
    const entries: IArchiveEntryInfo[] = [];
    const streamFiles = await this.toStreamFiles();

    return new Promise((resolve, reject) => {
      streamFiles.on('data', (streamFile: plugins.smartfile.StreamFile) => {
        entries.push({
          path: streamFile.relativeFilePath || 'unknown',
          size: 0, // Size not available without reading
          isDirectory: false,
          isFile: true,
        });
      });
      streamFiles.on('end', () => resolve(entries));
      streamFiles.on('error', reject);
    });
  }

  /**
   * Check if a specific file exists in the archive
   */
  public async hasFile(filePath: string): Promise<boolean> {
    this.ensureExtractionSource();
    const entries = await this.list();
    return entries.some((e) => e.path === filePath || e.path.endsWith(filePath));
  }


  // ============================================
  // PRIVATE HELPERS
  // ============================================

  /**
   * Ensure we're not in create mode when calling extraction methods
   */
  private ensureNotInCreateMode(methodName: string): void {
    if (this._mode === 'create') {
      throw new Error(
        `Cannot call .${methodName}() in creation mode. ` +
          `Use extraction methods (.url(), .file(), .stream(), .buffer()) for extraction mode.`
      );
    }
  }

  /**
   * Ensure we're not in extract mode when calling creation methods
   */
  private ensureNotInExtractMode(methodName: string): void {
    if (this._mode === 'extract') {
      throw new Error(
        `Cannot call .${methodName}() in extraction mode. ` +
          `Use .format() for creation mode.`
      );
    }
  }

  /**
   * Ensure an extraction source is configured
   */
  private ensureExtractionSource(): void {
    if (!this.sourceUrl && !this.sourceFilePath && !this.sourceStream && !this.archiveBuffer) {
      throw new Error(
        'No source configured. Call .url(), .file(), .stream(), or .buffer() first.'
      );
    }
  }

  /**
   * Ensure a format is configured for creation
   */
  private ensureCreationFormat(): void {
    if (!this.creationFormat) {
      throw new Error('No format specified. Call .format() before creating archive.');
    }
  }

  /**
   * Get the source stream
   */
  private async getSourceStream(): Promise<plugins.stream.Readable> {
    if (this.archiveBuffer) {
      return plugins.stream.Readable.from(this.archiveBuffer);
    }
    if (this.sourceStream) {
      return this.sourceStream;
    }
    if (this.sourceUrl) {
      const response = await plugins.smartrequest.SmartRequest.create()
        .url(this.sourceUrl)
        .get();
      const webStream = response.stream();
      return plugins.stream.Readable.fromWeb(webStream as any);
    }
    if (this.sourceFilePath) {
      return plugins.fs.createReadStream(this.sourceFilePath);
    }
    throw new Error('No archive source configured');
  }

  /**
   * Build a combined filter function from all configured filters
   */
  private buildFilterFunction(): TEntryFilter | undefined {
    const hasFilters =
      this._filters.length > 0 ||
      this._includePatterns.length > 0 ||
      this._excludePatterns.length > 0;

    if (!hasFilters) {
      return undefined;
    }

    return (entry: IArchiveEntryInfo) => {
      // Check include patterns (if any specified, at least one must match)
      if (this._includePatterns.length > 0) {
        const included = this._includePatterns.some((p) => p.test(entry.path));
        if (!included) return false;
      }

      // Check exclude patterns (none must match)
      for (const pattern of this._excludePatterns) {
        if (pattern.test(entry.path)) return false;
      }

      // Check custom filters (all must pass)
      for (const filter of this._filters) {
        if (!filter(entry)) return false;
      }

      return true;
    };
  }

  /**
   * Resolve pending directories to entries
   */
  private async resolveDirectories(): Promise<void> {
    for (const dir of this.pendingDirectories) {
      const files = await plugins.listFileTree(dir.sourcePath, '**/*');
      for (const filePath of files) {
        const archivePath = dir.archiveBase
          ? plugins.path.join(dir.archiveBase, filePath)
          : filePath;
        const absolutePath = plugins.path.join(dir.sourcePath, filePath);
        const content = await plugins.fsPromises.readFile(absolutePath);
        this.pendingEntries.push({
          archivePath,
          content,
        });
      }
    }
    this.pendingDirectories = [];
  }

  /**
   * Get entries filtered by include/exclude patterns
   */
  private getFilteredEntries(): IArchiveEntry[] {
    const filterFn = this.buildFilterFunction();
    if (!filterFn) {
      return this.pendingEntries;
    }

    return this.pendingEntries.filter((entry) =>
      filterFn({
        path: entry.archivePath,
        size: 0,
        isDirectory: false,
        isFile: true,
      })
    );
  }

  /**
   * Convert a stream to buffer
   */
  private async streamToBuffer(stream: plugins.stream.Readable): Promise<Buffer> {
    const chunks: Buffer[] = [];
    return new Promise((resolve, reject) => {
      stream.on('data', (chunk) => chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)));
      stream.on('end', () => resolve(Buffer.concat(chunks)));
      stream.on('error', reject);
    });
  }

  /**
   * Read first chunk from stream
   */
  private async readFirstChunk(stream: plugins.stream.Readable): Promise<Buffer> {
    return new Promise((resolve, reject) => {
      const onData = (chunk: Buffer) => {
        stream.removeListener('data', onData);
        stream.removeListener('error', reject);
        resolve(chunk);
      };
      stream.on('data', onData);
      stream.on('error', reject);
    });
  }
}