// Loaded from https://raw.githubusercontent.com/aricart/tweetnacl-deno/import-type-fixes/src/hash.ts


import { ByteArray, IntArray } from './array.ts';
import { checkArrayTypes } from './check.ts';

export const enum HashLength {
    Hash = 64, // hash bytes
}

export function hash(msg: ByteArray, len?: number): ByteArray {
    checkArrayTypes(msg);

    const h = ByteArray(len || HashLength.Hash);

    _hash(h, msg, msg.length);

    return h;
}

export function _hash(out: ByteArray, m: ByteArray, n: number) {
    const hh = IntArray(8),
        hl = IntArray(8),
        x = ByteArray(256);
    let i, b = n;

    hh[0] = 0x6a09e667;
    hh[1] = 0xbb67ae85;
    hh[2] = 0x3c6ef372;
    hh[3] = 0xa54ff53a;
    hh[4] = 0x510e527f;
    hh[5] = 0x9b05688c;
    hh[6] = 0x1f83d9ab;
    hh[7] = 0x5be0cd19;

    hl[0] = 0xf3bcc908;
    hl[1] = 0x84caa73b;
    hl[2] = 0xfe94f82b;
    hl[3] = 0x5f1d36f1;
    hl[4] = 0xade682d1;
    hl[5] = 0x2b3e6c1f;
    hl[6] = 0xfb41bd6b;
    hl[7] = 0x137e2179;

    _hashblocks_hl(hh, hl, m, n);
    n %= 128;

    for (i = 0; i < n; i++) x[i] = m[b - n + i];
    x[n] = 128;

    n = 256 - 128 * (n < 112 ? 1 : 0);
    x[n - 9] = 0;

    _ts64(x, n - 8, (b / 0x20000000) | 0, b << 3);
    _hashblocks_hl(hh, hl, x, n);

    for (i = 0; i < 8; i++) _ts64(out, 8 * i, hh[i], hl[i]);

    return 0;
}

const _K = [
    0x428a2f98, 0xd728ae22, 0x71374491, 0x23ef65cd,
    0xb5c0fbcf, 0xec4d3b2f, 0xe9b5dba5, 0x8189dbbc,
    0x3956c25b, 0xf348b538, 0x59f111f1, 0xb605d019,
    0x923f82a4, 0xaf194f9b, 0xab1c5ed5, 0xda6d8118,
    0xd807aa98, 0xa3030242, 0x12835b01, 0x45706fbe,
    0x243185be, 0x4ee4b28c, 0x550c7dc3, 0xd5ffb4e2,
    0x72be5d74, 0xf27b896f, 0x80deb1fe, 0x3b1696b1,
    0x9bdc06a7, 0x25c71235, 0xc19bf174, 0xcf692694,
    0xe49b69c1, 0x9ef14ad2, 0xefbe4786, 0x384f25e3,
    0x0fc19dc6, 0x8b8cd5b5, 0x240ca1cc, 0x77ac9c65,
    0x2de92c6f, 0x592b0275, 0x4a7484aa, 0x6ea6e483,
    0x5cb0a9dc, 0xbd41fbd4, 0x76f988da, 0x831153b5,
    0x983e5152, 0xee66dfab, 0xa831c66d, 0x2db43210,
    0xb00327c8, 0x98fb213f, 0xbf597fc7, 0xbeef0ee4,
    0xc6e00bf3, 0x3da88fc2, 0xd5a79147, 0x930aa725,
    0x06ca6351, 0xe003826f, 0x14292967, 0x0a0e6e70,
    0x27b70a85, 0x46d22ffc, 0x2e1b2138, 0x5c26c926,
    0x4d2c6dfc, 0x5ac42aed, 0x53380d13, 0x9d95b3df,
    0x650a7354, 0x8baf63de, 0x766a0abb, 0x3c77b2a8,
    0x81c2c92e, 0x47edaee6, 0x92722c85, 0x1482353b,
    0xa2bfe8a1, 0x4cf10364, 0xa81a664b, 0xbc423001,
    0xc24b8b70, 0xd0f89791, 0xc76c51a3, 0x0654be30,
    0xd192e819, 0xd6ef5218, 0xd6990624, 0x5565a910,
    0xf40e3585, 0x5771202a, 0x106aa070, 0x32bbd1b8,
    0x19a4c116, 0xb8d2d0c8, 0x1e376c08, 0x5141ab53,
    0x2748774c, 0xdf8eeb99, 0x34b0bcb5, 0xe19b48a8,
    0x391c0cb3, 0xc5c95a63, 0x4ed8aa4a, 0xe3418acb,
    0x5b9cca4f, 0x7763e373, 0x682e6ff3, 0xd6b2b8a3,
    0x748f82ee, 0x5defb2fc, 0x78a5636f, 0x43172f60,
    0x84c87814, 0xa1f0ab72, 0x8cc70208, 0x1a6439ec,
    0x90befffa, 0x23631e28, 0xa4506ceb, 0xde82bde9,
    0xbef9a3f7, 0xb2c67915, 0xc67178f2, 0xe372532b,
    0xca273ece, 0xea26619c, 0xd186b8c7, 0x21c0c207,
    0xeada7dd6, 0xcde0eb1e, 0xf57d4f7f, 0xee6ed178,
    0x06f067aa, 0x72176fba, 0x0a637dc5, 0xa2c898a6,
    0x113f9804, 0xbef90dae, 0x1b710b35, 0x131c471b,
    0x28db77f5, 0x23047d84, 0x32caab7b, 0x40c72493,
    0x3c9ebe0a, 0x15c9bebc, 0x431d67c4, 0x9c100d4c,
    0x4cc5d4be, 0xcb3e42b6, 0x597f299c, 0xfc657e2a,
    0x5fcb6fab, 0x3ad6faec, 0x6c44198c, 0x4a475817
];

function _hashblocks_hl(hh: IntArray, hl: IntArray, m: ByteArray, n: number): number {
    const wh = IntArray(16), wl = IntArray(16);

    let bh0, bh1, bh2, bh3, bh4, bh5, bh6, bh7,
        bl0, bl1, bl2, bl3, bl4, bl5, bl6, bl7,
        th, tl, i, j, h, l, a, b, c, d;

    let ah0 = hh[0],
        ah1 = hh[1],
        ah2 = hh[2],
        ah3 = hh[3],
        ah4 = hh[4],
        ah5 = hh[5],
        ah6 = hh[6],
        ah7 = hh[7],

        al0 = hl[0],
        al1 = hl[1],
        al2 = hl[2],
        al3 = hl[3],
        al4 = hl[4],
        al5 = hl[5],
        al6 = hl[6],
        al7 = hl[7];

    let pos = 0;

    while (n >= 128) {
        for (i = 0; i < 16; i++) {
            j = 8 * i + pos;
            wh[i] = (m[j + 0] << 24) | (m[j + 1] << 16) | (m[j + 2] << 8) | m[j + 3];
            wl[i] = (m[j + 4] << 24) | (m[j + 5] << 16) | (m[j + 6] << 8) | m[j + 7];
        }

        for (i = 0; i < 80; i++) {
            bh0 = ah0;
            bh1 = ah1;
            bh2 = ah2;
            bh3 = ah3;
            bh4 = ah4;
            bh5 = ah5;
            bh6 = ah6;
            bh7 = ah7;

            bl0 = al0;
            bl1 = al1;
            bl2 = al2;
            bl3 = al3;
            bl4 = al4;
            bl5 = al5;
            bl6 = al6;
            bl7 = al7;

            // add
            h = ah7;
            l = al7;

            a = l & 0xffff; b = l >>> 16;
            c = h & 0xffff; d = h >>> 16;

            // Sigma1
            h = ((ah4 >>> 14) | (al4 << (32 - 14))) ^ ((ah4 >>> 18) | (al4 << (32 - 18))) ^ ((al4 >>> (41 - 32)) | (ah4 << (32 - (41 - 32))));
            l = ((al4 >>> 14) | (ah4 << (32 - 14))) ^ ((al4 >>> 18) | (ah4 << (32 - 18))) ^ ((ah4 >>> (41 - 32)) | (al4 << (32 - (41 - 32))));

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            // Ch
            h = (ah4 & ah5) ^ (~ah4 & ah6);
            l = (al4 & al5) ^ (~al4 & al6);

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            // K
            h = _K[i * 2];
            l = _K[i * 2 + 1];

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            // w
            h = wh[i % 16];
            l = wl[i % 16];

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            b += a >>> 16;
            c += b >>> 16;
            d += c >>> 16;

            th = c & 0xffff | d << 16;
            tl = a & 0xffff | b << 16;

            // add
            h = th;
            l = tl;

            a = l & 0xffff; b = l >>> 16;
            c = h & 0xffff; d = h >>> 16;

            // Sigma0
            h = ((ah0 >>> 28) | (al0 << (32 - 28))) ^ ((al0 >>> (34 - 32)) | (ah0 << (32 - (34 - 32)))) ^ ((al0 >>> (39 - 32)) | (ah0 << (32 - (39 - 32))));
            l = ((al0 >>> 28) | (ah0 << (32 - 28))) ^ ((ah0 >>> (34 - 32)) | (al0 << (32 - (34 - 32)))) ^ ((ah0 >>> (39 - 32)) | (al0 << (32 - (39 - 32))));

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            // Maj
            h = (ah0 & ah1) ^ (ah0 & ah2) ^ (ah1 & ah2);
            l = (al0 & al1) ^ (al0 & al2) ^ (al1 & al2);

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            b += a >>> 16;
            c += b >>> 16;
            d += c >>> 16;

            bh7 = (c & 0xffff) | (d << 16);
            bl7 = (a & 0xffff) | (b << 16);

            // add
            h = bh3;
            l = bl3;

            a = l & 0xffff; b = l >>> 16;
            c = h & 0xffff; d = h >>> 16;

            h = th;
            l = tl;

            a += l & 0xffff; b += l >>> 16;
            c += h & 0xffff; d += h >>> 16;

            b += a >>> 16;
            c += b >>> 16;
            d += c >>> 16;

            bh3 = (c & 0xffff) | (d << 16);
            bl3 = (a & 0xffff) | (b << 16);

            ah1 = bh0;
            ah2 = bh1;
            ah3 = bh2;
            ah4 = bh3;
            ah5 = bh4;
            ah6 = bh5;
            ah7 = bh6;
            ah0 = bh7;

            al1 = bl0;
            al2 = bl1;
            al3 = bl2;
            al4 = bl3;
            al5 = bl4;
            al6 = bl5;
            al7 = bl6;
            al0 = bl7;

            if (i % 16 === 15) {
                for (j = 0; j < 16; j++) {
                    // add
                    h = wh[j];
                    l = wl[j];

                    a = l & 0xffff; b = l >>> 16;
                    c = h & 0xffff; d = h >>> 16;

                    h = wh[(j + 9) % 16];
                    l = wl[(j + 9) % 16];

                    a += l & 0xffff; b += l >>> 16;
                    c += h & 0xffff; d += h >>> 16;

                    // sigma0
                    th = wh[(j + 1) % 16];
                    tl = wl[(j + 1) % 16];
                    h = ((th >>> 1) | (tl << (32 - 1))) ^ ((th >>> 8) | (tl << (32 - 8))) ^ (th >>> 7);
                    l = ((tl >>> 1) | (th << (32 - 1))) ^ ((tl >>> 8) | (th << (32 - 8))) ^ ((tl >>> 7) | (th << (32 - 7)));

                    a += l & 0xffff; b += l >>> 16;
                    c += h & 0xffff; d += h >>> 16;

                    // sigma1
                    th = wh[(j + 14) % 16];
                    tl = wl[(j + 14) % 16];
                    h = ((th >>> 19) | (tl << (32 - 19))) ^ ((tl >>> (61 - 32)) | (th << (32 - (61 - 32)))) ^ (th >>> 6);
                    l = ((tl >>> 19) | (th << (32 - 19))) ^ ((th >>> (61 - 32)) | (tl << (32 - (61 - 32)))) ^ ((tl >>> 6) | (th << (32 - 6)));

                    a += l & 0xffff; b += l >>> 16;
                    c += h & 0xffff; d += h >>> 16;

                    b += a >>> 16;
                    c += b >>> 16;
                    d += c >>> 16;

                    wh[j] = (c & 0xffff) | (d << 16);
                    wl[j] = (a & 0xffff) | (b << 16);
                }
            }
        }

        // add
        h = ah0;
        l = al0;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[0];
        l = hl[0];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[0] = ah0 = (c & 0xffff) | (d << 16);
        hl[0] = al0 = (a & 0xffff) | (b << 16);

        h = ah1;
        l = al1;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[1];
        l = hl[1];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[1] = ah1 = (c & 0xffff) | (d << 16);
        hl[1] = al1 = (a & 0xffff) | (b << 16);

        h = ah2;
        l = al2;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[2];
        l = hl[2];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[2] = ah2 = (c & 0xffff) | (d << 16);
        hl[2] = al2 = (a & 0xffff) | (b << 16);

        h = ah3;
        l = al3;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[3];
        l = hl[3];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[3] = ah3 = (c & 0xffff) | (d << 16);
        hl[3] = al3 = (a & 0xffff) | (b << 16);

        h = ah4;
        l = al4;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[4];
        l = hl[4];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[4] = ah4 = (c & 0xffff) | (d << 16);
        hl[4] = al4 = (a & 0xffff) | (b << 16);

        h = ah5;
        l = al5;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[5];
        l = hl[5];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[5] = ah5 = (c & 0xffff) | (d << 16);
        hl[5] = al5 = (a & 0xffff) | (b << 16);

        h = ah6;
        l = al6;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[6];
        l = hl[6];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[6] = ah6 = (c & 0xffff) | (d << 16);
        hl[6] = al6 = (a & 0xffff) | (b << 16);

        h = ah7;
        l = al7;

        a = l & 0xffff; b = l >>> 16;
        c = h & 0xffff; d = h >>> 16;

        h = hh[7];
        l = hl[7];

        a += l & 0xffff; b += l >>> 16;
        c += h & 0xffff; d += h >>> 16;

        b += a >>> 16;
        c += b >>> 16;
        d += c >>> 16;

        hh[7] = ah7 = (c & 0xffff) | (d << 16);
        hl[7] = al7 = (a & 0xffff) | (b << 16);

        pos += 128;
        n -= 128;
    }

    return n;
}

function _ts64(x: ByteArray, i: number, h: number, l: number) {
    x[i] = (h >> 24) & 0xff;
    x[i + 1] = (h >> 16) & 0xff;
    x[i + 2] = (h >> 8) & 0xff;
    x[i + 3] = h & 0xff;
    x[i + 4] = (l >> 24) & 0xff;
    x[i + 5] = (l >> 16) & 0xff;
    x[i + 6] = (l >> 8) & 0xff;
    x[i + 7] = l & 0xff;
}