/**
 * CRC64: cyclic redundancy check, 64-bits
 *
 * In order to validate that artifacts are not being corrupted over the wire, this redundancy check allows us to
 * validate that there was no corruption during transmission. The implementation here is based on Go's hash/crc64 pkg,
 * but without the slicing-by-8 optimization: https://cs.opensource.google/go/go/+/master:src/hash/crc64/crc64.go
 *
 * This implementation uses a pregenerated table based on 0x9A6C9329AC4BC9B5 as the polynomial, the same polynomial that
 * is used for Azure Storage: https://github.com/Azure/azure-storage-net/blob/cbe605f9faa01bfc3003d75fc5a16b2eaccfe102/Lib/Common/Core/Util/Crc64.cs#L27
 */

// when transpile target is >= ES2020 (after dropping node 12) these can be changed to bigint literals - ts(2737)
const PREGEN_POLY_TABLE = [
  BigInt('0x0000000000000000'),
  BigInt('0x7F6EF0C830358979'),
  BigInt('0xFEDDE190606B12F2'),
  BigInt('0x81B31158505E9B8B'),
  BigInt('0xC962E5739841B68F'),
  BigInt('0xB60C15BBA8743FF6'),
  BigInt('0x37BF04E3F82AA47D'),
  BigInt('0x48D1F42BC81F2D04'),
  BigInt('0xA61CECB46814FE75'),
  BigInt('0xD9721C7C5821770C'),
  BigInt('0x58C10D24087FEC87'),
  BigInt('0x27AFFDEC384A65FE'),
  BigInt('0x6F7E09C7F05548FA'),
  BigInt('0x1010F90FC060C183'),
  BigInt('0x91A3E857903E5A08'),
  BigInt('0xEECD189FA00BD371'),
  BigInt('0x78E0FF3B88BE6F81'),
  BigInt('0x078E0FF3B88BE6F8'),
  BigInt('0x863D1EABE8D57D73'),
  BigInt('0xF953EE63D8E0F40A'),
  BigInt('0xB1821A4810FFD90E'),
  BigInt('0xCEECEA8020CA5077'),
  BigInt('0x4F5FFBD87094CBFC'),
  BigInt('0x30310B1040A14285'),
  BigInt('0xDEFC138FE0AA91F4'),
  BigInt('0xA192E347D09F188D'),
  BigInt('0x2021F21F80C18306'),
  BigInt('0x5F4F02D7B0F40A7F'),
  BigInt('0x179EF6FC78EB277B'),
  BigInt('0x68F0063448DEAE02'),
  BigInt('0xE943176C18803589'),
  BigInt('0x962DE7A428B5BCF0'),
  BigInt('0xF1C1FE77117CDF02'),
  BigInt('0x8EAF0EBF2149567B'),
  BigInt('0x0F1C1FE77117CDF0'),
  BigInt('0x7072EF2F41224489'),
  BigInt('0x38A31B04893D698D'),
  BigInt('0x47CDEBCCB908E0F4'),
  BigInt('0xC67EFA94E9567B7F'),
  BigInt('0xB9100A5CD963F206'),
  BigInt('0x57DD12C379682177'),
  BigInt('0x28B3E20B495DA80E'),
  BigInt('0xA900F35319033385'),
  BigInt('0xD66E039B2936BAFC'),
  BigInt('0x9EBFF7B0E12997F8'),
  BigInt('0xE1D10778D11C1E81'),
  BigInt('0x606216208142850A'),
  BigInt('0x1F0CE6E8B1770C73'),
  BigInt('0x8921014C99C2B083'),
  BigInt('0xF64FF184A9F739FA'),
  BigInt('0x77FCE0DCF9A9A271'),
  BigInt('0x08921014C99C2B08'),
  BigInt('0x4043E43F0183060C'),
  BigInt('0x3F2D14F731B68F75'),
  BigInt('0xBE9E05AF61E814FE'),
  BigInt('0xC1F0F56751DD9D87'),
  BigInt('0x2F3DEDF8F1D64EF6'),
  BigInt('0x50531D30C1E3C78F'),
  BigInt('0xD1E00C6891BD5C04'),
  BigInt('0xAE8EFCA0A188D57D'),
  BigInt('0xE65F088B6997F879'),
  BigInt('0x9931F84359A27100'),
  BigInt('0x1882E91B09FCEA8B'),
  BigInt('0x67EC19D339C963F2'),
  BigInt('0xD75ADABD7A6E2D6F'),
  BigInt('0xA8342A754A5BA416'),
  BigInt('0x29873B2D1A053F9D'),
  BigInt('0x56E9CBE52A30B6E4'),
  BigInt('0x1E383FCEE22F9BE0'),
  BigInt('0x6156CF06D21A1299'),
  BigInt('0xE0E5DE5E82448912'),
  BigInt('0x9F8B2E96B271006B'),
  BigInt('0x71463609127AD31A'),
  BigInt('0x0E28C6C1224F5A63'),
  BigInt('0x8F9BD7997211C1E8'),
  BigInt('0xF0F5275142244891'),
  BigInt('0xB824D37A8A3B6595'),
  BigInt('0xC74A23B2BA0EECEC'),
  BigInt('0x46F932EAEA507767'),
  BigInt('0x3997C222DA65FE1E'),
  BigInt('0xAFBA2586F2D042EE'),
  BigInt('0xD0D4D54EC2E5CB97'),
  BigInt('0x5167C41692BB501C'),
  BigInt('0x2E0934DEA28ED965'),
  BigInt('0x66D8C0F56A91F461'),
  BigInt('0x19B6303D5AA47D18'),
  BigInt('0x980521650AFAE693'),
  BigInt('0xE76BD1AD3ACF6FEA'),
  BigInt('0x09A6C9329AC4BC9B'),
  BigInt('0x76C839FAAAF135E2'),
  BigInt('0xF77B28A2FAAFAE69'),
  BigInt('0x8815D86ACA9A2710'),
  BigInt('0xC0C42C4102850A14'),
  BigInt('0xBFAADC8932B0836D'),
  BigInt('0x3E19CDD162EE18E6'),
  BigInt('0x41773D1952DB919F'),
  BigInt('0x269B24CA6B12F26D'),
  BigInt('0x59F5D4025B277B14'),
  BigInt('0xD846C55A0B79E09F'),
  BigInt('0xA72835923B4C69E6'),
  BigInt('0xEFF9C1B9F35344E2'),
  BigInt('0x90973171C366CD9B'),
  BigInt('0x1124202993385610'),
  BigInt('0x6E4AD0E1A30DDF69'),
  BigInt('0x8087C87E03060C18'),
  BigInt('0xFFE938B633338561'),
  BigInt('0x7E5A29EE636D1EEA'),
  BigInt('0x0134D92653589793'),
  BigInt('0x49E52D0D9B47BA97'),
  BigInt('0x368BDDC5AB7233EE'),
  BigInt('0xB738CC9DFB2CA865'),
  BigInt('0xC8563C55CB19211C'),
  BigInt('0x5E7BDBF1E3AC9DEC'),
  BigInt('0x21152B39D3991495'),
  BigInt('0xA0A63A6183C78F1E'),
  BigInt('0xDFC8CAA9B3F20667'),
  BigInt('0x97193E827BED2B63'),
  BigInt('0xE877CE4A4BD8A21A'),
  BigInt('0x69C4DF121B863991'),
  BigInt('0x16AA2FDA2BB3B0E8'),
  BigInt('0xF86737458BB86399'),
  BigInt('0x8709C78DBB8DEAE0'),
  BigInt('0x06BAD6D5EBD3716B'),
  BigInt('0x79D4261DDBE6F812'),
  BigInt('0x3105D23613F9D516'),
  BigInt('0x4E6B22FE23CC5C6F'),
  BigInt('0xCFD833A67392C7E4'),
  BigInt('0xB0B6C36E43A74E9D'),
  BigInt('0x9A6C9329AC4BC9B5'),
  BigInt('0xE50263E19C7E40CC'),
  BigInt('0x64B172B9CC20DB47'),
  BigInt('0x1BDF8271FC15523E'),
  BigInt('0x530E765A340A7F3A'),
  BigInt('0x2C608692043FF643'),
  BigInt('0xADD397CA54616DC8'),
  BigInt('0xD2BD67026454E4B1'),
  BigInt('0x3C707F9DC45F37C0'),
  BigInt('0x431E8F55F46ABEB9'),
  BigInt('0xC2AD9E0DA4342532'),
  BigInt('0xBDC36EC59401AC4B'),
  BigInt('0xF5129AEE5C1E814F'),
  BigInt('0x8A7C6A266C2B0836'),
  BigInt('0x0BCF7B7E3C7593BD'),
  BigInt('0x74A18BB60C401AC4'),
  BigInt('0xE28C6C1224F5A634'),
  BigInt('0x9DE29CDA14C02F4D'),
  BigInt('0x1C518D82449EB4C6'),
  BigInt('0x633F7D4A74AB3DBF'),
  BigInt('0x2BEE8961BCB410BB'),
  BigInt('0x548079A98C8199C2'),
  BigInt('0xD53368F1DCDF0249'),
  BigInt('0xAA5D9839ECEA8B30'),
  BigInt('0x449080A64CE15841'),
  BigInt('0x3BFE706E7CD4D138'),
  BigInt('0xBA4D61362C8A4AB3'),
  BigInt('0xC52391FE1CBFC3CA'),
  BigInt('0x8DF265D5D4A0EECE'),
  BigInt('0xF29C951DE49567B7'),
  BigInt('0x732F8445B4CBFC3C'),
  BigInt('0x0C41748D84FE7545'),
  BigInt('0x6BAD6D5EBD3716B7'),
  BigInt('0x14C39D968D029FCE'),
  BigInt('0x95708CCEDD5C0445'),
  BigInt('0xEA1E7C06ED698D3C'),
  BigInt('0xA2CF882D2576A038'),
  BigInt('0xDDA178E515432941'),
  BigInt('0x5C1269BD451DB2CA'),
  BigInt('0x237C997575283BB3'),
  BigInt('0xCDB181EAD523E8C2'),
  BigInt('0xB2DF7122E51661BB'),
  BigInt('0x336C607AB548FA30'),
  BigInt('0x4C0290B2857D7349'),
  BigInt('0x04D364994D625E4D'),
  BigInt('0x7BBD94517D57D734'),
  BigInt('0xFA0E85092D094CBF'),
  BigInt('0x856075C11D3CC5C6'),
  BigInt('0x134D926535897936'),
  BigInt('0x6C2362AD05BCF04F'),
  BigInt('0xED9073F555E26BC4'),
  BigInt('0x92FE833D65D7E2BD'),
  BigInt('0xDA2F7716ADC8CFB9'),
  BigInt('0xA54187DE9DFD46C0'),
  BigInt('0x24F29686CDA3DD4B'),
  BigInt('0x5B9C664EFD965432'),
  BigInt('0xB5517ED15D9D8743'),
  BigInt('0xCA3F8E196DA80E3A'),
  BigInt('0x4B8C9F413DF695B1'),
  BigInt('0x34E26F890DC31CC8'),
  BigInt('0x7C339BA2C5DC31CC'),
  BigInt('0x035D6B6AF5E9B8B5'),
  BigInt('0x82EE7A32A5B7233E'),
  BigInt('0xFD808AFA9582AA47'),
  BigInt('0x4D364994D625E4DA'),
  BigInt('0x3258B95CE6106DA3'),
  BigInt('0xB3EBA804B64EF628'),
  BigInt('0xCC8558CC867B7F51'),
  BigInt('0x8454ACE74E645255'),
  BigInt('0xFB3A5C2F7E51DB2C'),
  BigInt('0x7A894D772E0F40A7'),
  BigInt('0x05E7BDBF1E3AC9DE'),
  BigInt('0xEB2AA520BE311AAF'),
  BigInt('0x944455E88E0493D6'),
  BigInt('0x15F744B0DE5A085D'),
  BigInt('0x6A99B478EE6F8124'),
  BigInt('0x224840532670AC20'),
  BigInt('0x5D26B09B16452559'),
  BigInt('0xDC95A1C3461BBED2'),
  BigInt('0xA3FB510B762E37AB'),
  BigInt('0x35D6B6AF5E9B8B5B'),
  BigInt('0x4AB846676EAE0222'),
  BigInt('0xCB0B573F3EF099A9'),
  BigInt('0xB465A7F70EC510D0'),
  BigInt('0xFCB453DCC6DA3DD4'),
  BigInt('0x83DAA314F6EFB4AD'),
  BigInt('0x0269B24CA6B12F26'),
  BigInt('0x7D0742849684A65F'),
  BigInt('0x93CA5A1B368F752E'),
  BigInt('0xECA4AAD306BAFC57'),
  BigInt('0x6D17BB8B56E467DC'),
  BigInt('0x12794B4366D1EEA5'),
  BigInt('0x5AA8BF68AECEC3A1'),
  BigInt('0x25C64FA09EFB4AD8'),
  BigInt('0xA4755EF8CEA5D153'),
  BigInt('0xDB1BAE30FE90582A'),
  BigInt('0xBCF7B7E3C7593BD8'),
  BigInt('0xC399472BF76CB2A1'),
  BigInt('0x422A5673A732292A'),
  BigInt('0x3D44A6BB9707A053'),
  BigInt('0x759552905F188D57'),
  BigInt('0x0AFBA2586F2D042E'),
  BigInt('0x8B48B3003F739FA5'),
  BigInt('0xF42643C80F4616DC'),
  BigInt('0x1AEB5B57AF4DC5AD'),
  BigInt('0x6585AB9F9F784CD4'),
  BigInt('0xE436BAC7CF26D75F'),
  BigInt('0x9B584A0FFF135E26'),
  BigInt('0xD389BE24370C7322'),
  BigInt('0xACE74EEC0739FA5B'),
  BigInt('0x2D545FB4576761D0'),
  BigInt('0x523AAF7C6752E8A9'),
  BigInt('0xC41748D84FE75459'),
  BigInt('0xBB79B8107FD2DD20'),
  BigInt('0x3ACAA9482F8C46AB'),
  BigInt('0x45A459801FB9CFD2'),
  BigInt('0x0D75ADABD7A6E2D6'),
  BigInt('0x721B5D63E7936BAF'),
  BigInt('0xF3A84C3BB7CDF024'),
  BigInt('0x8CC6BCF387F8795D'),
  BigInt('0x620BA46C27F3AA2C'),
  BigInt('0x1D6554A417C62355'),
  BigInt('0x9CD645FC4798B8DE'),
  BigInt('0xE3B8B53477AD31A7'),
  BigInt('0xAB69411FBFB21CA3'),
  BigInt('0xD407B1D78F8795DA'),
  BigInt('0x55B4A08FDFD90E51'),
  BigInt('0x2ADA5047EFEC8728')
]

export type CRC64DigestEncoding = 'hex' | 'base64' | 'buffer'

class CRC64 {
  private _crc: bigint

  constructor() {
    this._crc = BigInt(0)
  }

  update(data: Buffer | string): void {
    const buffer = typeof data === 'string' ? Buffer.from(data) : data
    let crc = CRC64.flip64Bits(this._crc)

    for (const dataByte of buffer) {
      const crcByte = Number(crc & BigInt(0xff))
      crc = PREGEN_POLY_TABLE[crcByte ^ dataByte] ^ (crc >> BigInt(8))
    }

    this._crc = CRC64.flip64Bits(crc)
  }

  digest(encoding?: CRC64DigestEncoding): string | Buffer {
    switch (encoding) {
      case 'hex':
        return this._crc.toString(16).toUpperCase()
      case 'base64':
        return this.toBuffer().toString('base64')
      default:
        return this.toBuffer()
    }
  }

  private toBuffer(): Buffer {
    return Buffer.from(
      [0, 8, 16, 24, 32, 40, 48, 56].map(s =>
        Number((this._crc >> BigInt(s)) & BigInt(0xff))
      )
    )
  }

  static flip64Bits(n: bigint): bigint {
    return (BigInt(1) << BigInt(64)) - BigInt(1) - n
  }
}

export default CRC64