import {
  WordArray,
  Hasher,
} from './core';

// Constants table
const T = [];

// Compute constants
for (let i = 0; i < 64; i += 1) {
  T[i] = (Math.abs(Math.sin(i + 1)) * 0x100000000) | 0;
}

const FF = (a, b, c, d, x, s, t) => {
  const n = a + ((b & c) | (~b & d)) + x + t;
  return ((n << s) | (n >>> (32 - s))) + b;
};

const GG = (a, b, c, d, x, s, t) => {
  const n = a + ((b & d) | (c & ~d)) + x + t;
  return ((n << s) | (n >>> (32 - s))) + b;
};

const HH = (a, b, c, d, x, s, t) => {
  const n = a + (b ^ c ^ d) + x + t;
  return ((n << s) | (n >>> (32 - s))) + b;
};

const II = (a, b, c, d, x, s, t) => {
  const n = a + (c ^ (b | ~d)) + x + t;
  return ((n << s) | (n >>> (32 - s))) + b;
};

/**
 * MD5 hash algorithm.
 */
export class MD5Algo extends Hasher {
  _doReset() {
    this._hash = new WordArray([
      0x67452301,
      0xefcdab89,
      0x98badcfe,
      0x10325476,
    ]);
  }

  _doProcessBlock(M, offset) {
    const _M = M;

    // Swap endian
    for (let i = 0; i < 16; i += 1) {
      // Shortcuts
      const offset_i = offset + i;
      const M_offset_i = M[offset_i];

      _M[offset_i] = (
        (((M_offset_i << 8) | (M_offset_i >>> 24)) & 0x00ff00ff)
        | (((M_offset_i << 24) | (M_offset_i >>> 8)) & 0xff00ff00)
      );
    }

    // Shortcuts
    const H = this._hash.words;

    const M_offset_0 = _M[offset + 0];
    const M_offset_1 = _M[offset + 1];
    const M_offset_2 = _M[offset + 2];
    const M_offset_3 = _M[offset + 3];
    const M_offset_4 = _M[offset + 4];
    const M_offset_5 = _M[offset + 5];
    const M_offset_6 = _M[offset + 6];
    const M_offset_7 = _M[offset + 7];
    const M_offset_8 = _M[offset + 8];
    const M_offset_9 = _M[offset + 9];
    const M_offset_10 = _M[offset + 10];
    const M_offset_11 = _M[offset + 11];
    const M_offset_12 = _M[offset + 12];
    const M_offset_13 = _M[offset + 13];
    const M_offset_14 = _M[offset + 14];
    const M_offset_15 = _M[offset + 15];

    // Working varialbes
    let a = H[0];
    let b = H[1];
    let c = H[2];
    let d = H[3];

    // Computation
    a = FF(a, b, c, d, M_offset_0, 7, T[0]);
    d = FF(d, a, b, c, M_offset_1, 12, T[1]);
    c = FF(c, d, a, b, M_offset_2, 17, T[2]);
    b = FF(b, c, d, a, M_offset_3, 22, T[3]);
    a = FF(a, b, c, d, M_offset_4, 7, T[4]);
    d = FF(d, a, b, c, M_offset_5, 12, T[5]);
    c = FF(c, d, a, b, M_offset_6, 17, T[6]);
    b = FF(b, c, d, a, M_offset_7, 22, T[7]);
    a = FF(a, b, c, d, M_offset_8, 7, T[8]);
    d = FF(d, a, b, c, M_offset_9, 12, T[9]);
    c = FF(c, d, a, b, M_offset_10, 17, T[10]);
    b = FF(b, c, d, a, M_offset_11, 22, T[11]);
    a = FF(a, b, c, d, M_offset_12, 7, T[12]);
    d = FF(d, a, b, c, M_offset_13, 12, T[13]);
    c = FF(c, d, a, b, M_offset_14, 17, T[14]);
    b = FF(b, c, d, a, M_offset_15, 22, T[15]);

    a = GG(a, b, c, d, M_offset_1, 5, T[16]);
    d = GG(d, a, b, c, M_offset_6, 9, T[17]);
    c = GG(c, d, a, b, M_offset_11, 14, T[18]);
    b = GG(b, c, d, a, M_offset_0, 20, T[19]);
    a = GG(a, b, c, d, M_offset_5, 5, T[20]);
    d = GG(d, a, b, c, M_offset_10, 9, T[21]);
    c = GG(c, d, a, b, M_offset_15, 14, T[22]);
    b = GG(b, c, d, a, M_offset_4, 20, T[23]);
    a = GG(a, b, c, d, M_offset_9, 5, T[24]);
    d = GG(d, a, b, c, M_offset_14, 9, T[25]);
    c = GG(c, d, a, b, M_offset_3, 14, T[26]);
    b = GG(b, c, d, a, M_offset_8, 20, T[27]);
    a = GG(a, b, c, d, M_offset_13, 5, T[28]);
    d = GG(d, a, b, c, M_offset_2, 9, T[29]);
    c = GG(c, d, a, b, M_offset_7, 14, T[30]);
    b = GG(b, c, d, a, M_offset_12, 20, T[31]);

    a = HH(a, b, c, d, M_offset_5, 4, T[32]);
    d = HH(d, a, b, c, M_offset_8, 11, T[33]);
    c = HH(c, d, a, b, M_offset_11, 16, T[34]);
    b = HH(b, c, d, a, M_offset_14, 23, T[35]);
    a = HH(a, b, c, d, M_offset_1, 4, T[36]);
    d = HH(d, a, b, c, M_offset_4, 11, T[37]);
    c = HH(c, d, a, b, M_offset_7, 16, T[38]);
    b = HH(b, c, d, a, M_offset_10, 23, T[39]);
    a = HH(a, b, c, d, M_offset_13, 4, T[40]);
    d = HH(d, a, b, c, M_offset_0, 11, T[41]);
    c = HH(c, d, a, b, M_offset_3, 16, T[42]);
    b = HH(b, c, d, a, M_offset_6, 23, T[43]);
    a = HH(a, b, c, d, M_offset_9, 4, T[44]);
    d = HH(d, a, b, c, M_offset_12, 11, T[45]);
    c = HH(c, d, a, b, M_offset_15, 16, T[46]);
    b = HH(b, c, d, a, M_offset_2, 23, T[47]);

    a = II(a, b, c, d, M_offset_0, 6, T[48]);
    d = II(d, a, b, c, M_offset_7, 10, T[49]);
    c = II(c, d, a, b, M_offset_14, 15, T[50]);
    b = II(b, c, d, a, M_offset_5, 21, T[51]);
    a = II(a, b, c, d, M_offset_12, 6, T[52]);
    d = II(d, a, b, c, M_offset_3, 10, T[53]);
    c = II(c, d, a, b, M_offset_10, 15, T[54]);
    b = II(b, c, d, a, M_offset_1, 21, T[55]);
    a = II(a, b, c, d, M_offset_8, 6, T[56]);
    d = II(d, a, b, c, M_offset_15, 10, T[57]);
    c = II(c, d, a, b, M_offset_6, 15, T[58]);
    b = II(b, c, d, a, M_offset_13, 21, T[59]);
    a = II(a, b, c, d, M_offset_4, 6, T[60]);
    d = II(d, a, b, c, M_offset_11, 10, T[61]);
    c = II(c, d, a, b, M_offset_2, 15, T[62]);
    b = II(b, c, d, a, M_offset_9, 21, T[63]);

    // Intermediate hash value
    H[0] = (H[0] + a) | 0;
    H[1] = (H[1] + b) | 0;
    H[2] = (H[2] + c) | 0;
    H[3] = (H[3] + d) | 0;
  }
  /* eslint-ensable no-param-reassign */

  _doFinalize() {
    // Shortcuts
    const data = this._data;
    const dataWords = data.words;

    const nBitsTotal = this._nDataBytes * 8;
    const nBitsLeft = data.sigBytes * 8;

    // Add padding
    dataWords[nBitsLeft >>> 5] |= 0x80 << (24 - (nBitsLeft % 32));

    const nBitsTotalH = Math.floor(nBitsTotal / 0x100000000);
    const nBitsTotalL = nBitsTotal;
    dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 15] = (
      (((nBitsTotalH << 8) | (nBitsTotalH >>> 24)) & 0x00ff00ff)
      | (((nBitsTotalH << 24) | (nBitsTotalH >>> 8)) & 0xff00ff00)
    );
    dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 14] = (
      (((nBitsTotalL << 8) | (nBitsTotalL >>> 24)) & 0x00ff00ff)
      | (((nBitsTotalL << 24) | (nBitsTotalL >>> 8)) & 0xff00ff00)
    );

    data.sigBytes = (dataWords.length + 1) * 4;

    // Hash final blocks
    this._process();

    // Shortcuts
    const hash = this._hash;
    const H = hash.words;

    // Swap endian
    for (let i = 0; i < 4; i += 1) {
      // Shortcut
      const H_i = H[i];

      H[i] = (((H_i << 8) | (H_i >>> 24)) & 0x00ff00ff)
        | (((H_i << 24) | (H_i >>> 8)) & 0xff00ff00);
    }

    // Return final computed hash
    return hash;
  }

  clone() {
    const clone = super.clone.call(this);
    clone._hash = this._hash.clone();

    return clone;
  }
}

/**
 * Shortcut function to the hasher's object interface.
 *
 * @param {WordArray|string} message The message to hash.
 *
 * @return {WordArray} The hash.
 *
 * @static
 *
 * @example
 *
 *     var hash = CryptoJS.MD5('message');
 *     var hash = CryptoJS.MD5(wordArray);
 */
export const MD5 = Hasher._createHelper(MD5Algo);

/**
 * Shortcut function to the HMAC's object interface.
 *
 * @param {WordArray|string} message The message to hash.
 * @param {WordArray|string} key The secret key.
 *
 * @return {WordArray} The HMAC.
 *
 * @static
 *
 * @example
 *
 *     var hmac = CryptoJS.HmacMD5(message, key);
 */
export const HmacMD5 = Hasher._createHmacHelper(MD5Algo);