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// Extracted from https://github.com/crypto-browserify/ripemd160

const ARRAY16 = new Array(16)

const zl = initU8Array([
  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
  3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
  1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
  4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
])

const zr = initU8Array([
  5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
  6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
  15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
  8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
  12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
])

const sl = initU8Array([
  11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
  7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
  11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
  11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
  9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
])

const sr = initU8Array([
  8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
  9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
  9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
  15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
  8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
])

const hl = initU32Array([0x00000000, 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xa953fd4e])
const hr = initU32Array([0x50a28be6, 0x5c4dd124, 0x6d703ef3, 0x7a6d76e9, 0x00000000])

function rotl(x: number, n: number): number {
  return (x << n) | (x >>> (32 - n))
}

function fn1(
  a: number, b: number, c: number, d: number, e: number, m: number, k: number, s: number
): number {
  return (rotl((a + (b ^ c ^ d) + m + k) | 0, s) + e) | 0
}

function fn2(
  a: number, b: number, c: number, d: number, e: number, m: number, k: number, s: number
): number {
  return (rotl((a + ((b & c) | ((~b) & d)) + m + k) | 0, s) + e) | 0
}

function fn3(
  a: number, b: number, c: number, d: number, e: number, m: number, k: number, s: number
): number {
  return (rotl((a + ((b | (~c)) ^ d) + m + k) | 0, s) + e) | 0
}

function fn4(
  a: number, b: number, c: number, d: number, e: number, m: number, k: number, s: number
): number {
  return (rotl((a + ((b & d) | (c & (~d))) + m + k) | 0, s) + e) | 0
}

function fn5(
  a: number, b: number, c: number, d: number, e: number, m: number, k: number, s: number
): number {
  return (rotl((a + (b ^ (c | (~d))) + m + k) | 0, s) + e) | 0
}

function readInt32LE(buffer: ByteArray, offset: number): number {
  offset >>>= 0
  return (buffer[offset])
    | (buffer[offset + 1] << 8)
    | (buffer[offset + 2] << 16)
    | (buffer[offset + 3] << 24)
}

function writeUInt32LE(buffer: ByteArray, value: number, offset: number): number {
  value = +value
  offset >>>= 0
  buffer[offset + 3] = (value >>> 24)
  buffer[offset + 2] = (value >>> 16)
  buffer[offset + 1] = (value >>> 8)
  buffer[offset] = (value & 0xff)
  return offset + 4
}

function writeInt32LE(buffer: ByteArray, value: number, offset: number): number {
  value = +value
  offset >>>= 0
  buffer[offset] = (value & 0xff)
  buffer[offset + 1] = (value >>> 8)
  buffer[offset + 2] = (value >>> 16)
  buffer[offset + 3] = (value >>> 24)
  return offset + 4
}

function initU32Array(data: number[]): U32Array {
  if (typeof Uint32Array !== 'undefined') {
    return new Uint32Array(data)
  } else {
    return data
  }
}

function initU8Array(data: number[]): ByteArray {
  if (typeof Uint8Array !== 'undefined') {
    return new Uint8Array(data)
  } else {
    return data
  }
}

function createU8Array(size: number): ByteArray {
  if (typeof Uint8Array !== 'undefined') {
    return new Uint8Array(size)
  } else {
    return new Array<number>(size)
  }
}

export type ByteArray = number[] | Uint8Array

type U32Array = number[] | Uint32Array

export class RIPEMD160 {
  private _block: ByteArray;

  private _blockSize: number;

  private _blockOffset: number;

  private _length: number[];

  private _finalized: boolean;

  private _a: number;

  private _b: number;

  private _c: number;

  private _d: number;

  private _e: number;

  constructor() {
    this._block = createU8Array(64)
    this._blockSize = 64
    this._blockOffset = 0
    this._length = [0, 0, 0, 0]
    this._finalized = false

    this._a = 0x67452301
    this._b = 0xefcdab89
    this._c = 0x98badcfe
    this._d = 0x10325476
    this._e = 0xc3d2e1f0
  }

  update(data: ByteArray) {
    if (this._finalized) throw new Error('Digest already called')

    // consume data
    const block = this._block
    let offset = 0
    while (this._blockOffset + data.length - offset >= this._blockSize) {
      for (let i = this._blockOffset; i < this._blockSize;) block[i++] = data[offset++]
      this._update()
      this._blockOffset = 0
    }
    while (offset < data.length) block[this._blockOffset++] = data[offset++]

    // update length
    for (let j = 0, carry = data.length * 8; carry > 0; ++j) {
      this._length[j] += carry
      carry = (this._length[j] / 0x0100000000) | 0
      if (carry > 0) this._length[j] -= 0x0100000000 * carry
    }

    return this
  }

  private _update() {
    const words = ARRAY16
    for (let j = 0; j < 16; ++j) {
      words[j] = readInt32LE(this._block, j * 4)
    }

    let al = this._a | 0
    let bl = this._b | 0
    let cl = this._c | 0
    let dl = this._d | 0
    let el = this._e | 0

    let ar = this._a | 0
    let br = this._b | 0
    let cr = this._c | 0
    let dr = this._d | 0
    let er = this._e | 0

    // computation
    for (let i = 0; i < 80; i += 1) {
      let tl: number
      let tr: number
      if (i < 16) {
        tl = fn1(al, bl, cl, dl, el, words[zl[i]], hl[0], sl[i])
        tr = fn5(ar, br, cr, dr, er, words[zr[i]], hr[0], sr[i])
      } else if (i < 32) {
        tl = fn2(al, bl, cl, dl, el, words[zl[i]], hl[1], sl[i])
        tr = fn4(ar, br, cr, dr, er, words[zr[i]], hr[1], sr[i])
      } else if (i < 48) {
        tl = fn3(al, bl, cl, dl, el, words[zl[i]], hl[2], sl[i])
        tr = fn3(ar, br, cr, dr, er, words[zr[i]], hr[2], sr[i])
      } else if (i < 64) {
        tl = fn4(al, bl, cl, dl, el, words[zl[i]], hl[3], sl[i])
        tr = fn2(ar, br, cr, dr, er, words[zr[i]], hr[3], sr[i])
      } else { // if (i<80) {
        tl = fn5(al, bl, cl, dl, el, words[zl[i]], hl[4], sl[i])
        tr = fn1(ar, br, cr, dr, er, words[zr[i]], hr[4], sr[i])
      }

      al = el
      el = dl
      dl = rotl(cl, 10)
      cl = bl
      bl = tl

      ar = er
      er = dr
      dr = rotl(cr, 10)
      cr = br
      br = tr
    }

    // update state
    const t = (this._b + cl + dr) | 0
    this._b = (this._c + dl + er) | 0
    this._c = (this._d + el + ar) | 0
    this._d = (this._e + al + br) | 0
    this._e = (this._a + bl + cr) | 0
    this._a = t
  }

  digest(): ByteArray {
    if (this._finalized) {
      throw new Error('Digest already called')
    }

    this._finalized = true

    // create padding and handle blocks
    this._block[this._blockOffset++] = 0x80
    if (this._blockOffset > 56) {
      this._block.fill(0, this._blockOffset, 64)
      this._update()
      this._blockOffset = 0
    }

    this._block.fill(0, this._blockOffset, 56)
    writeUInt32LE(this._block, this._length[0], 56)
    writeUInt32LE(this._block, this._length[1], 60)
    this._update()

    // produce result
    const buffer = createU8Array(20)
    writeInt32LE(buffer, this._a, 0)
    writeInt32LE(buffer, this._b, 4)
    writeInt32LE(buffer, this._c, 8)
    writeInt32LE(buffer, this._d, 12)
    writeInt32LE(buffer, this._e, 16)

    // reset state
    this._block.fill(0)
    this._blockOffset = 0
    for (let i = 0; i < 4; ++i) {
      this._length[i] = 0
    }

    return buffer
  }


}

export default RIPEMD160

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