import * as plugins from './plugins.js';
import { commitinfo } from './00_commitinfo_data.js';
import type {
  TContainerArchiveCommands,
  IInitOptions,
  IOpenOptions,
  IIngestOptions,
  IIngestItem,
  IIngestItemOptions,
  IRestoreOptions,
  ISnapshot,
  ISnapshotFilter,
  IVerifyOptions,
  IVerifyResult,
  IRetentionPolicy,
  IPruneResult,
  IRepairResult,
  IUnlockOptions,
  IIngestProgress,
  IIngestComplete,
  IVerifyError,
  IRepositoryConfig,
} from './interfaces.js';

/**
 * Content-addressed incremental backup engine.
 *
 * Provides deduplicated, optionally encrypted, gzip-compressed storage
 * for arbitrary data streams with full snapshot history.
 */
export class ContainerArchive {
  private bridge: plugins.smartrust.RustBridge<TContainerArchiveCommands>;
  private repoPath: string;
  private spawned = false;

  // Event subjects
  public ingestProgress = new plugins.smartrx.rxjs.Subject<IIngestProgress>();
  public ingestComplete = new plugins.smartrx.rxjs.Subject<IIngestComplete>();
  public verifyError = new plugins.smartrx.rxjs.Subject<IVerifyError>();

  private constructor(repoPath: string) {
    this.repoPath = plugins.path.resolve(repoPath);

    const packageDir = plugins.path.resolve(
      plugins.path.dirname(new URL(import.meta.url).pathname),
      '..',
    );

    this.bridge = new plugins.smartrust.RustBridge<TContainerArchiveCommands>({
      binaryName: 'containerarchive',
      localPaths: [
        plugins.path.join(packageDir, 'dist_rust', 'containerarchive'),
      ],
      readyTimeoutMs: 30000,
      requestTimeoutMs: 300000,
    });

    // Listen for events from the Rust binary
    this.bridge.on('event', (event: { event: string; data: any }) => {
      if (event.event === 'progress') {
        this.ingestProgress.next(event.data);
      }
    });
  }

  private async ensureSpawned(): Promise<void> {
    if (!this.spawned) {
      await this.bridge.spawn();
      this.spawned = true;
    }
  }

  /**
   * Initialize a new repository at the given path.
   */
  static async init(repoPath: string, options?: IInitOptions): Promise<ContainerArchive> {
    const instance = new ContainerArchive(repoPath);
    await instance.ensureSpawned();

    await instance.bridge.sendCommand('init', {
      path: instance.repoPath,
      passphrase: options?.passphrase,
    });

    return instance;
  }

  /**
   * Open an existing repository at the given path.
   */
  static async open(repoPath: string, options?: IOpenOptions): Promise<ContainerArchive> {
    const instance = new ContainerArchive(repoPath);
    await instance.ensureSpawned();

    await instance.bridge.sendCommand('open', {
      path: instance.repoPath,
      passphrase: options?.passphrase,
    });

    return instance;
  }

  /**
   * Ingest a single data stream into the repository.
   */
  async ingest(
    inputStream: NodeJS.ReadableStream,
    options?: IIngestOptions,
  ): Promise<ISnapshot> {
    const socketPath = plugins.path.join(
      plugins.os.tmpdir(),
      `containerarchive-ingest-${Date.now()}-${Math.random().toString(36).slice(2)}.sock`,
    );

    // Create Unix socket server that Rust will connect to
    const { promise: dataTransferred, server } = await this.createSocketServer(
      socketPath,
      inputStream,
    );

    try {
      // Send ingest command to Rust (Rust connects to our socket)
      const result = await this.bridge.sendCommand('ingest', {
        socketPath,
        tags: options?.tags,
        items: options?.items || [{ name: 'data', type: 'data' }],
      });

      // Wait for data transfer to complete
      await dataTransferred;

      const snapshot = result.snapshot;
      this.ingestComplete.next({
        snapshotId: snapshot.id,
        originalSize: snapshot.originalSize,
        storedSize: snapshot.storedSize,
        newChunks: snapshot.newChunks,
        reusedChunks: snapshot.reusedChunks,
      });

      return snapshot;
    } finally {
      server.close();
      // Clean up socket file
      try {
        plugins.fs.unlinkSync(socketPath);
      } catch {}
    }
  }

  /**
   * Ingest multiple data streams as a single multi-item snapshot.
   * Each item gets its own Unix socket for parallel data transfer.
   */
  async ingestMulti(
    items: IIngestItem[],
    options?: IIngestOptions,
  ): Promise<ISnapshot> {
    if (items.length === 0) {
      throw new Error('At least one item is required');
    }

    // Create one socket per item
    const sockets: Array<{
      socketPath: string;
      promise: Promise<void>;
      server: plugins.net.Server;
    }> = [];

    const itemOptions: Array<{
      name: string;
      type: string;
      socketPath: string;
    }> = [];

    try {
      for (const item of items) {
        const socketPath = plugins.path.join(
          plugins.os.tmpdir(),
          `containerarchive-ingest-${Date.now()}-${Math.random().toString(36).slice(2)}.sock`,
        );

        const { promise, server } = await this.createSocketServer(socketPath, item.stream);
        sockets.push({ socketPath, promise, server });
        itemOptions.push({
          name: item.name,
          type: item.type || 'data',
          socketPath,
        });
      }

      // Send ingestMulti command to Rust with per-item socket paths
      const result = await this.bridge.sendCommand('ingestMulti', {
        tags: options?.tags,
        items: itemOptions,
      });

      // Wait for all data transfers
      await Promise.all(sockets.map((s) => s.promise));

      const snapshot = result.snapshot;
      this.ingestComplete.next({
        snapshotId: snapshot.id,
        originalSize: snapshot.originalSize,
        storedSize: snapshot.storedSize,
        newChunks: snapshot.newChunks,
        reusedChunks: snapshot.reusedChunks,
      });

      return snapshot;
    } finally {
      for (const s of sockets) {
        s.server.close();
        try { plugins.fs.unlinkSync(s.socketPath); } catch {}
      }
    }
  }

  /**
   * List snapshots with optional filtering.
   */
  async listSnapshots(filter?: ISnapshotFilter): Promise<ISnapshot[]> {
    const result = await this.bridge.sendCommand('listSnapshots', {
      filter,
    });
    return result.snapshots;
  }

  /**
   * Get details of a specific snapshot.
   */
  async getSnapshot(snapshotId: string): Promise<ISnapshot> {
    const result = await this.bridge.sendCommand('getSnapshot', {
      snapshotId,
    });
    return result.snapshot;
  }

  /**
   * Restore a snapshot to a ReadableStream.
   */
  async restore(
    snapshotId: string,
    options?: IRestoreOptions,
  ): Promise<NodeJS.ReadableStream> {
    const socketPath = plugins.path.join(
      plugins.os.tmpdir(),
      `containerarchive-restore-${Date.now()}-${Math.random().toString(36).slice(2)}.sock`,
    );

    // Create Unix socket server that Rust will connect to and write data
    const { readable, server } = await this.createRestoreSocketServer(socketPath);

    // Send restore command to Rust (Rust connects and writes data)
    // Don't await — let it run in parallel with reading
    this.bridge.sendCommand('restore', {
      snapshotId,
      socketPath,
      item: options?.item,
    }).catch((err) => {
      readable.destroy(err);
    }).finally(() => {
      server.close();
      try {
        plugins.fs.unlinkSync(socketPath);
      } catch {}
    });

    return readable;
  }

  /**
   * Verify repository integrity.
   */
  async verify(options?: IVerifyOptions): Promise<IVerifyResult> {
    const result = await this.bridge.sendCommand('verify', {
      level: options?.level || 'standard',
    });

    for (const error of result.errors) {
      this.verifyError.next(error);
    }

    return result;
  }

  /**
   * Repair repository (rebuild index, remove stale locks).
   */
  async repair(): Promise<IRepairResult> {
    return this.bridge.sendCommand('repair', {});
  }

  /**
   * Prune old snapshots and garbage-collect unreferenced packs.
   */
  async prune(retention: IRetentionPolicy, dryRun = false): Promise<IPruneResult> {
    return this.bridge.sendCommand('prune', {
      retention,
      dryRun,
    });
  }

  /**
   * Rebuild the global index from pack .idx files.
   */
  async reindex(): Promise<void> {
    await this.bridge.sendCommand('reindex', {});
  }

  /**
   * Remove locks from the repository.
   */
  async unlock(options?: IUnlockOptions): Promise<void> {
    await this.bridge.sendCommand('unlock', {
      force: options?.force,
    });
  }

  /**
   * Subscribe to events.
   */
  on(event: 'ingest:progress', handler: (data: IIngestProgress) => void): plugins.smartrx.rxjs.Subscription;
  on(event: 'ingest:complete', handler: (data: IIngestComplete) => void): plugins.smartrx.rxjs.Subscription;
  on(event: 'verify:error', handler: (data: IVerifyError) => void): plugins.smartrx.rxjs.Subscription;
  on(event: string, handler: (data: any) => void): plugins.smartrx.rxjs.Subscription {
    switch (event) {
      case 'ingest:progress':
        return this.ingestProgress.subscribe(handler);
      case 'ingest:complete':
        return this.ingestComplete.subscribe(handler);
      case 'verify:error':
        return this.verifyError.subscribe(handler);
      default:
        throw new Error(`Unknown event: ${event}`);
    }
  }

  /**
   * Close the repository and terminate the Rust process.
   */
  async close(): Promise<void> {
    try {
      await this.bridge.sendCommand('close', {});
    } catch {
      // Ignore errors during close
    }
    this.bridge.kill();
    this.spawned = false;

    this.ingestProgress.complete();
    this.ingestComplete.complete();
    this.verifyError.complete();
  }

  // ==================== Private Helpers ====================

  /**
   * Create a Unix socket server that accepts a connection from Rust
   * and pipes the inputStream to it (for ingest).
   */
  private createSocketServer(
    socketPath: string,
    inputStream: NodeJS.ReadableStream,
  ): Promise<{
    promise: Promise<void>;
    server: plugins.net.Server;
  }> {
    return new Promise((resolve, reject) => {
      const server = plugins.net.createServer((socket) => {
        // Pipe input data to the Rust process via socket
        const readableStream = inputStream as NodeJS.ReadableStream;
        (readableStream as any).pipe(socket);
      });

      server.on('error', reject);

      server.listen(socketPath, () => {
        const promise = new Promise<void>((res) => {
          server.on('close', () => res());
          // Also resolve after a connection is handled
          server.once('connection', (socket) => {
            socket.on('end', () => {
              res();
            });
            socket.on('error', () => {
              res();
            });
          });
        });
        resolve({ promise, server });
      });
    });
  }

  /**
   * Create a Unix socket server that accepts a connection from Rust
   * and provides a ReadableStream of the received data (for restore).
   */
  private createRestoreSocketServer(
    socketPath: string,
  ): Promise<{
    readable: plugins.stream.PassThrough;
    server: plugins.net.Server;
  }> {
    return new Promise((resolve, reject) => {
      const passthrough = new plugins.stream.PassThrough();
      const server = plugins.net.createServer((socket) => {
        socket.pipe(passthrough);
      });

      server.on('error', reject);

      server.listen(socketPath, () => {
        resolve({ readable: passthrough, server });
      });
    });
  }
}