/*=============================================================================

    This file is part of ARB.

    ARB is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    ARB is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with ARB; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

=============================================================================*/
/******************************************************************************

    Copyright (C) 2016 Fredrik Johansson

******************************************************************************/

#include "acb_dirichlet.h"

int main()
{

    slong k;
    slong prec = 100;
    slong nq = 10;
    ulong q[10] = { 2, 3, 4, 5, 6, 10, 15, 30, 308, 961};

    flint_printf("dft....");
    fflush(stdout);

    for (k = 0; k < nq; k++)
    {
        slong i;
        acb_ptr v, w1, w2;

        v = _acb_vec_init(q[k]);
        w1 = _acb_vec_init(q[k]);
        w2 = _acb_vec_init(q[k]);

        for (i = 0; i < q[k]; i++)
            acb_set_si(v + i, i);

        acb_dirichlet_dft_pol(w1, v, q[k], prec);
        acb_dirichlet_dft_fast(w2, v, q[k], prec);

        for (i = 0; i < q[k]; i++)
        {
            if (!acb_overlaps(w1 + i, w2 + i))
            {
                flint_printf("differ from index %ld / %ld \n\n",i,q[k]);
                flint_printf("pol =\n");
                acb_vec_printd(w1, q[k], 10);
                flint_printf("fast =\n");
                acb_vec_printd(w2, q[k], 10);
                flint_printf("\n\n");
                abort();
            }
        }
        
        _acb_vec_clear(v, q[k]);
        _acb_vec_clear(w1, q[k]);
        _acb_vec_clear(w2, q[k]);
    }
    flint_printf("PASS\n");
}