/**
 * EU Laissez-Passer contactless IC chip reading
 * BAC/EAC support, LDS data group reading (DG1, DG2, DG3), biometric data extraction
 */

export interface ChipData {
  dg1: {
    mrz: string[];
    documentType: string;
    issuingCountry: string;
    documentNumber: string;
    dateOfBirth: string;
    sex: string;
    expirationDate: string;
    nationality: string;
    personalNumber: string;
  };
  dg2?: {
    faceImage: Buffer;
    faceImageFormat: string;
    faceImageLength: number;
  };
  dg3?: {
    fingerprints: Array<{
      fingerPosition: number;
      fingerprintImage: Buffer;
      fingerprintFormat: string;
      fingerprintLength: number;
    }>;
  };
  dg4?: {
    irisImages: Array<{
      eyePosition: number;
      irisImage: Buffer;
      irisFormat: string;
      irisLength: number;
    }>;
  };
  sod?: {
    signedData: Buffer;
    algorithm: string;
  };
}

export interface ChipReadingConfig {
  enableBAC?: boolean; // Basic Access Control
  enableEAC?: boolean; // Extended Access Control
  enablePACE?: boolean; // Password Authenticated Connection Establishment
  readerType?: 'contactless' | 'contact';
}

/**
 * Read data from EU-LP chip
 * Note: This is a placeholder implementation. In production, this would use
 * actual NFC/contactless card reading libraries (e.g., pcsc-lite, nfc-pcsc)
 */
export class EUChipReader {
  constructor(config: ChipReadingConfig = {}) {
    // Config stored for future use
    void config;
  }

  /**
   * Establish BAC (Basic Access Control) session
   */
  async establishBAC(mrz: string[]): Promise<{ kEnc: Buffer; kMac: Buffer; ssc: Buffer }> {
    // BAC uses MRZ to derive keys
    // In production, implement full BAC protocol
    const mrzData = mrz.join('');
    const kSeed = this.deriveKSeed(mrzData);
    const kEnc = this.deriveKey(kSeed, 'ENC');
    const kMac = this.deriveKey(kSeed, 'MAC');
    const ssc = Buffer.alloc(8, 0); // Send sequence counter

    return { kEnc, kMac, ssc };
  }

  /**
   * Establish EAC (Extended Access Control) session
   */
  async establishEAC(_certificate: Buffer): Promise<{ sessionKey: Buffer }> {
    // EAC uses certificate-based authentication
    // In production, implement full EAC protocol
    const sessionKey = Buffer.alloc(16, 0); // Placeholder
    return { sessionKey };
  }

  /**
   * Read LDS (Logical Data Structure) data groups
   */
  async readLDS(
    dataGroups: number[] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
  ): Promise<ChipData> {
    // In production, this would read from actual chip
    // For now, return placeholder structure

    const chipData: ChipData = {
      dg1: {
        mrz: [],
        documentType: '',
        issuingCountry: '',
        documentNumber: '',
        dateOfBirth: '',
        sex: '',
        expirationDate: '',
        nationality: '',
        personalNumber: '',
      },
    };

    if (dataGroups.includes(2)) {
      chipData.dg2 = {
        faceImage: Buffer.alloc(0),
        faceImageFormat: 'JPEG',
        faceImageLength: 0,
      };
    }

    if (dataGroups.includes(3)) {
      chipData.dg3 = {
        fingerprints: [],
      };
    }

    if (dataGroups.includes(4)) {
      chipData.dg4 = {
        irisImages: [],
      };
    }

    return chipData;
  }

  /**
   * Read specific data group
   */
  async readDataGroup(_groupNumber: number): Promise<Buffer> {
    // In production, read from chip
    return Buffer.alloc(0);
  }

  /**
   * Extract biometric data from chip
   */
  async extractBiometricData(): Promise<{
    faceImage?: Buffer;
    fingerprints?: Array<{ position: number; image: Buffer }>;
    irisImages?: Array<{ position: number; image: Buffer }>;
  }> {
    const lds = await this.readLDS([2, 3, 4]);

    return {
      faceImage: lds.dg2?.faceImage,
      fingerprints: lds.dg3?.fingerprints.map((fp) => ({
        position: fp.fingerPosition,
        image: fp.fingerprintImage,
      })),
      irisImages: lds.dg4?.irisImages.map((iris) => ({
        position: iris.eyePosition,
        image: iris.irisImage,
      })),
    };
  }

  /**
   * Derive K-Seed from MRZ (for BAC)
   */
  private deriveKSeed(mrz: string): Buffer {
    // Simplified K-Seed derivation
    // In production, use proper BAC key derivation (SHA-1)
    const crypto = require('crypto');
    return crypto.createHash('sha1').update(mrz).digest().slice(0, 16);
  }

  /**
   * Derive key from K-Seed
   */
  private deriveKey(kSeed: Buffer, purpose: 'ENC' | 'MAC'): Buffer {
    // Simplified key derivation
    // In production, use proper BAC key derivation
    const crypto = require('crypto');
    const hash = crypto.createHash('sha1').update(Buffer.concat([kSeed, Buffer.from(purpose)])).digest();
    return hash.slice(0, 16);
  }
}

/**
 * Read EU-LP chip data
 */
export async function readEULPChip(
  mrz?: string[],
  config?: ChipReadingConfig
): Promise<ChipData> {
  const reader = new EUChipReader(config);

  if (mrz && config?.enableBAC) {
    await reader.establishBAC(mrz);
  }

  return reader.readLDS();
}

