/*
    Copyright (C) 2009 William Hart
    Copyright (C) 2010 Sebastian Pancratz

    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 2.1 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_poly.h"
#include "ulong_extras.h"

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

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

    

    /* Aliasing */
    for (i = 0; i < 200 * flint_test_multiplier(); i++)
    {
        fmpz_poly_t a, b;
        slong n;

        fmpz_poly_init(a);
        fmpz_poly_init(b);
        fmpz_poly_randtest(b, state, n_randint(state, 100), 200);
        n = n_randint(state, 150);

        fmpz_poly_reverse(a, b, n);
        fmpz_poly_reverse(b, b, n);

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

        fmpz_poly_clear(a);
        fmpz_poly_clear(b);
    }

    /* Correctness (?) */
    for (i = 0; i < 200 * flint_test_multiplier(); i++)
    {
        fmpz_poly_t a, b;
        slong j, len, n;

        fmpz_poly_init(a);
        fmpz_poly_init(b);
        fmpz_poly_randtest(b, state, n_randint(state, 100), 200);
        n = n_randint(state, 150);

        len = FLINT_MIN(n, b->length);
        if (len)
        {
            fmpz_poly_fit_length(a, n);
            for (j = 0; j < len; j++)
                fmpz_set(a->coeffs + (n - len) + j, b->coeffs + (len - 1 - j));
            _fmpz_poly_set_length(a, n);
            _fmpz_poly_normalise(a);
        }

        fmpz_poly_reverse(b, b, n);

        result = (fmpz_poly_equal(a, b));
        if (!result)
        {
            flint_printf("FAIL:\n");
            flint_printf("n = %wd\n", n);
            flint_printf("a = "), fmpz_poly_print(a), flint_printf("\n\n");
            flint_printf("b = "), 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 0;
}