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

    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.h"

int main()
{
    slong iter;
    flint_rand_t state;

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

    flint_randinit(state);

    for (iter = 0; iter < 1000; iter++)
    {
        acb_t x, y;
        arb_t a;
        slong prec;

        acb_init(x);
        acb_init(y);
        arb_init(a);

        acb_randtest_special(x, state, 1 + n_randint(state, 200), 2 + n_randint(state, 100));
        arb_randtest_special(a, state, 1 + n_randint(state, 200), 2 + n_randint(state, 100));

        prec = 2 + n_randint(state, 200);

        acb_csgn(a, x);

        if (acb_is_zero(x))
        {
            acb_zero(y);
        }
        else
        {
            acb_mul(y, x, x, prec);
            acb_sqrt(y, y, prec);
            acb_div(y, y, x, prec);
        }

        if (!arb_contains(acb_realref(y), a))
        {
            flint_printf("FAIL: overlap\n\n");
            flint_printf("x = "); acb_printd(x, 15); flint_printf("\n\n");
            flint_printf("a = "); arb_printd(a, 15); flint_printf("\n\n");
            flint_printf("y = "); acb_printd(y, 15); flint_printf("\n\n");
            abort();
        }

        acb_clear(x);
        acb_clear(y);
        arb_clear(a);
    }

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