import * as plugins from './plugins.js';
import * as paths from './paths.js';
import { net } from './plugins.js';
import { ClamAVManager } from './classes.clamav.manager.js';

export class ClamAvService {
  private host: string;
  private port: number;
  private manager: ClamAVManager;

  constructor(host: string = '127.0.0.1', port: number = 3310) {
    this.host = host;
    this.port = port;
    this.manager = new ClamAVManager();

    // Listen to ClamAV logs
    this.manager.on('log', (event) => {
      if (event.type === 'scan') {
        console.log(`[ClamAV Scan] ${event.message}`);
      }
    });
  }

  private async ensureContainerStarted(): Promise<void> {
    await this.manager.startContainer();
  }

  /**
   * Scans an in-memory Buffer using ClamAV daemon's INSTREAM command.
   */
  public async scanBuffer(buffer: Buffer): Promise<{ isInfected: boolean; reason?: string }> {
    await this.ensureContainerStarted();
    return new Promise((resolve, reject) => {
      const client = new net.Socket();
  
      client.connect(this.port, this.host, () => {
        console.log('Connected to ClamAV daemon');
        client.write('zINSTREAM\0'); // Start the INSTREAM command
        const chunkSize = 1024;
        let offset = 0;
  
        // Send data in chunks
        while (offset < buffer.length) {
          const chunk = buffer.slice(offset, offset + chunkSize);
          console.log('Sending chunk:', chunk.toString('utf8'));
  
          const sizeBuf = Buffer.alloc(4);
          sizeBuf.writeUInt32BE(chunk.length, 0);
          client.write(sizeBuf);
          client.write(chunk);
  
          offset += chunkSize;
        }
  
        // Send end-of-stream signal
        const endOfStream = Buffer.alloc(4);
        endOfStream.writeUInt32BE(0, 0);
        console.log('Sending end-of-stream signal');
        client.write(endOfStream);
      });
  
      client.on('data', (data) => {
        const response = data.toString();
        console.log('Raw Response from ClamAV:', response);
  
        const isInfected = response.includes('FOUND');
        const reason = isInfected ? response.split('FOUND')[0].trim() : undefined;
  
        resolve({ isInfected, reason });
        client.end();
      });
  
      client.on('error', (err) => {
        console.error('Error communicating with ClamAV:', err);
        reject(err);
      });
  
      client.on('close', () => {
        console.log('Connection to ClamAV daemon closed');
      });
    });
  }

  /**
   * Scans a string by converting it to a Buffer and using scanBuffer.
   */
  public async scanString(input: string): Promise<{ isInfected: boolean; reason?: string }> {
    console.log('Scanning string:', input); // Debug the input string
    const buffer = Buffer.from(input, 'utf8');
    console.log('Converted buffer:', buffer.toString('utf8')); // Debug the converted buffer
    return this.scanBuffer(buffer);
  }

  /**
   * Verifies the ClamAV daemon is reachable.
   */
  public async verifyConnection(): Promise<boolean> {
    await this.ensureContainerStarted();
    return new Promise((resolve, reject) => {
      const client = new net.Socket();

      client.connect(this.port, this.host, () => {
        console.log('Successfully connected to ClamAV daemon');
        client.end();
        resolve(true);
      });

      client.on('error', (err) => {
        console.error('Failed to connect to ClamAV daemon:', err);
        reject(err);
      });
    });
  }

  /**
   * Scans data from a NodeJS stream using ClamAV daemon's INSTREAM command.
   */
  public async scanStream(stream: NodeJS.ReadableStream): Promise<{ isInfected: boolean; reason?: string }> {
    await this.ensureContainerStarted();
    return new Promise((resolve, reject) => {
      const client = new net.Socket();

      client.connect(this.port, this.host, () => {
        console.log('Connected to ClamAV daemon for stream scanning');
        client.write('zINSTREAM\0');

        stream.on('data', (chunk: Buffer) => {
          const buf = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
          const sizeBuf = Buffer.alloc(4);
          sizeBuf.writeUInt32BE(buf.length, 0);
          client.write(sizeBuf);
          client.write(buf);
        });

        stream.on('end', () => {
          const endOfStream = Buffer.alloc(4);
          endOfStream.writeUInt32BE(0, 0);
          console.log('Stream ended, sending end-of-stream signal');
          client.write(endOfStream);
        });

        stream.on('error', (err) => {
          console.error('Error reading stream:', err);
          reject(err);
        });
      });

      client.on('data', (data) => {
        const response = data.toString();
        console.log('Raw Response from ClamAV (stream):', response);
        const isInfected = response.includes('FOUND');
        const reason = isInfected ? response.split('FOUND')[0].trim() : undefined;
        resolve({ isInfected, reason });
        client.end();
      });

      client.on('error', (err) => {
        console.error('Error with ClamAV stream scanning:', err);
        reject(err);
      });
    });
  }

  /**
   * Scans a file from a web URL as a stream using ClamAV daemon's INSTREAM command.
   */
  public async scanFileFromWebAsStream(url: string): Promise<{ isInfected: boolean; reason?: string }> {
    return new Promise((resolve, reject) => {
      const protocol = url.startsWith('https') ? plugins.https : plugins.http;
      protocol.get(url, (response) => {
        this.scanStream(response).then(resolve).catch(reject);
      }).on('error', (err) => {
        console.error('Error fetching URL:', err);
        reject(err);
      });
    });
  }

  /**
   * Scans a web resource by URL using ClamAV daemon's INSTREAM command.
   */
  public async scanWebStream(webstreamArg: ReadableStream): Promise<{ isInfected: boolean; reason?: string }> {
    // Convert the web ReadableStream to a NodeJS ReadableStream
    const nodeStream = plugins.smartstream.nodewebhelpers.convertWebReadableToNodeReadable(webstreamArg);
    return this.scanStream(nodeStream);
  }
}