/*
    Copyright (C) 2021 Daniel Schultz

    This file is part of FLINT.

    FLINT is free software: you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include "test_helpers.h"
#include "nmod_vec.h"
#include "nmod_mat.h"

TEST_FUNCTION_START(nmod_mat_nmod_vec_mul, state)
{
    slong i;

    for (i = 0; i < 1000 * flint_test_multiplier(); i++)
    {
        mp_limb_t p;
        nmod_mat_t A, B, C;
        mp_limb_t * a, * c;
        mp_limb_t ** aa, ** cc;
        slong j, m, n, alen;

        p = n_randtest_not_zero(state);
        m = n_randint(state, 50);
        n = n_randint(state, 50);
        alen = n_randint(state, 50);

        nmod_mat_init(C, 1, n, p);
        nmod_mat_init(A, 1, m, p);
        nmod_mat_init(B, m, n, p);
        c = _nmod_vec_init(n);
        a = _nmod_vec_init(alen);

        nmod_mat_randtest(B, state);
        _nmod_vec_randtest(c, state, n, B->mod);
        _nmod_vec_randtest(a, state, alen, B->mod);

        cc = FLINT_ARRAY_ALLOC(n, mp_limb_t*);
        for (j = 0; j < n; j++)
        {
            cc[j] = FLINT_ARRAY_ALLOC(1, mp_limb_t);
            cc[j][0] = c[j];
        }

        aa = FLINT_ARRAY_ALLOC(alen, mp_limb_t*);
        for (j = 0; j < alen; j++)
        {
            aa[j] = FLINT_ARRAY_ALLOC(1, mp_limb_t);
            aa[j][0] = a[j];
        }

        nmod_mat_nmod_vec_mul(c, a, alen, B);
        nmod_mat_nmod_vec_mul_ptr(cc, (const mp_limb_t * const *)aa, alen, B);

        /* supposed to match mul of the chopped or zero-extended a */
        for (j = 0; j < m && j < alen; j++)
            nmod_mat_entry(A, 0, j) = a[j];

        nmod_mat_mul(C, A, B);

        for (j = 0; j < n; j++)
            if (nmod_mat_entry(C, 0, j) != c[j] || nmod_mat_entry(C, 0, j) != cc[j][0])
                TEST_FUNCTION_FAIL("");

        nmod_mat_clear(A);
        nmod_mat_clear(B);
        nmod_mat_clear(C);
        _nmod_vec_clear(c);
        _nmod_vec_clear(a);

        for (j = 0; j < n; j++)
        {
            flint_free(cc[j]);
        }
        flint_free(cc);

        for (j = 0; j < alen; j++)
        {
            flint_free(aa[j]);
        }
        flint_free(aa);
    }

    TEST_FUNCTION_END(state);
}
