/*
    Copyright (C) 2010 William Hart

    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("mulmid_classical....");
    fflush(stdout);

    

    /* Check aliasing of a and b */
    for (i = 0; i < 200 * flint_test_multiplier(); i++)
    {
        fmpz_poly_t a, b, c;

        fmpz_poly_init(a);
        fmpz_poly_init(b);
        fmpz_poly_init(c);
        fmpz_poly_randtest(b, state, n_randint(state, 50), 200);
        if (b->length == 0)
            fmpz_poly_zero(c);
        else
            fmpz_poly_randtest(c, state, n_randint(state, b->length), 200);

        fmpz_poly_mulmid_classical(a, b, c);
        fmpz_poly_mulmid_classical(b, b, c);

        result = (fmpz_poly_equal(a, b));
        if (!result)
        {
            flint_printf("FAIL:\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);
        fmpz_poly_clear(c);
    }

    /* Check aliasing of a and c */
    for (i = 0; i < 200 * flint_test_multiplier(); i++)
    {
        fmpz_poly_t a, b, c;

        fmpz_poly_init(a);
        fmpz_poly_init(b);
        fmpz_poly_init(c);
        fmpz_poly_randtest(b, state, n_randint(state, 50), 200);
        if (b->length == 0)
            fmpz_poly_zero(c);
        else
            fmpz_poly_randtest(c, state, n_randint(state, b->length), 200);

        fmpz_poly_mulmid_classical(a, b, c);
        fmpz_poly_mulmid_classical(c, b, c);

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

        fmpz_poly_clear(a);
        fmpz_poly_clear(b);
        fmpz_poly_clear(c);
    }

    /* Compare with mul_basecase */
    for (i = 0; i < 200 * flint_test_multiplier(); i++)
    {
        fmpz_poly_t a, b, c, d;

        fmpz_poly_init(a);
        fmpz_poly_init(b);
        fmpz_poly_init(c);
        fmpz_poly_init(d);
        fmpz_poly_randtest(b, state, n_randint(state, 50), 200);
        fmpz_poly_randtest(c, state, n_randint(state, b->length + 1), 200);

        fmpz_poly_mulmid_classical(d, b, c);
        if (b->length == 0 || c->length == 0)
        {
            result = (d->length == 0);
        }
        else
        {
            fmpz_poly_mul_classical(a, b, c);
            fmpz_poly_truncate(a, b->length);
            fmpz_poly_shift_right(a, a, c->length - 1);
            result = (fmpz_poly_equal(a, d));
        }
        if (!result)
        {
            flint_printf("FAIL:\n");
            flint_printf("b = "), fmpz_poly_print(b), flint_printf("\n\n");
            flint_printf("c = "), fmpz_poly_print(c), flint_printf("\n\n");
            flint_printf("a = "), fmpz_poly_print(a), flint_printf("\n\n");
            flint_printf("d = "), fmpz_poly_print(d), flint_printf("\n\n");
            abort();
        }

        fmpz_poly_clear(a);
        fmpz_poly_clear(b);
        fmpz_poly_clear(c);
        fmpz_poly_clear(d);
    }

    

    FLINT_TEST_CLEANUP(state);
    flint_printf("PASS\n");
    return 0;
}