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

    This file is part of FLINT.

    FLINT 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.

    FLINT 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 FLINT; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

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

    Copyright (C) 2013 Fredrik Johansson

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

#include "flint.h"
#include "fmpz.h"
#include "fmpz_poly.h"

int
main(void)
{
    int i;
    FLINT_TEST_INIT(state);

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

    for (i = 0; i < 2000; i++)
    {
        fmpz_poly_t a, b;
        slong e, n;

        fmpz_poly_init(a);
        fmpz_poly_init(b);

        e = n_randint(state, 100) - 50;
        n = n_randint(state, 250);

        fmpz_poly_randtest(a, state, n_randint(state, 250),
            1 + n_randint(state, 100));

        fmpz_poly_eta_qexp(a, e, n);

        fmpz_poly_eta_qexp(b, 1, n + n_randint(state, 10));

        if (n == 0)
        {
            fmpz_poly_zero(b);
        }
        else
        {
            if (e >= 0)
            {
                fmpz_poly_pow_trunc(b, b, e, n);
            }
            else
            {
                fmpz_poly_inv_series(b, b, n);
                fmpz_poly_pow_trunc(b, b, -e, n);
            }
        }

        if (!fmpz_poly_equal(a, b))
        {
            flint_printf("FAIL (powering):\n");
            flint_printf("e = %wd, n = %wd\n\n", e, n);
            fmpz_poly_print(a), flint_printf("\n\n");
            fmpz_poly_print(b), flint_printf("\n\n");
            abort();
        }

        fmpz_poly_clear(a);
        fmpz_poly_clear(b);
    }

    FLINT_TEST_CLEANUP(state);
    flint_printf("PASS\n");
    return EXIT_SUCCESS;
}

