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

    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) 2009 William Hart
    Copyright (C) 2010 Sebastian Pancratz

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

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

int
main(void)
{
    int i, result;
    ulong cflags = UWORD(0);

    FLINT_TEST_INIT(state);

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

    /* Check aliasing of a and b */
    for (i = 0; i < 100 * flint_test_multiplier(); i++)
    {
        fmpq_poly_t a, b;
        fmpz_t n;
        mpz_t m;

        fmpz_init(n);
        mpz_init(m);
        fmpz_randtest(n, state, 200);
        fmpz_get_mpz(m, n);

        fmpq_poly_init(a);
        fmpq_poly_init(b);
        fmpq_poly_randtest(a, state, n_randint(state, 100), n_randint(state, 200));

        fmpq_poly_scalar_mul_mpz(b, a, m);
        fmpq_poly_scalar_mul_mpz(a, a, m);

        cflags |= fmpq_poly_is_canonical(a) ? 0 : 1;
        cflags |= fmpq_poly_is_canonical(b) ? 0 : 2;
        result = (fmpq_poly_equal(a, b) && !cflags);
        if (!result)
        {
            flint_printf("FAIL:\n");
            fmpq_poly_debug(a), flint_printf("\n\n");
            fmpq_poly_debug(b), flint_printf("\n\n");
            flint_printf("cflags = %wu\n\n", cflags);
            abort();
        }

        fmpz_clear(n);
        mpz_clear(m);
        fmpq_poly_clear(a);
        fmpq_poly_clear(b);
    }

    /* Check that n (a + b) == na + nb */
    for (i = 0; i < 100 * flint_test_multiplier(); i++)
    {
        fmpq_poly_t a, b, lhs, rhs;
        fmpz_t n;
        mpz_t m;

        fmpz_init(n);
        mpz_init(m);
        fmpz_randtest(n, state, 200);
        fmpz_get_mpz(m, n);

        fmpq_poly_init(a);
        fmpq_poly_init(b);
        fmpq_poly_init(lhs);
        fmpq_poly_init(rhs);
        fmpq_poly_randtest(a, state, n_randint(state, 100), n_randint(state, 200));
        fmpq_poly_randtest(b, state, n_randint(state, 100), n_randint(state, 200));

        fmpq_poly_scalar_mul_mpz(lhs, a, m);
        fmpq_poly_scalar_mul_mpz(rhs, b, m);
        fmpq_poly_add(rhs, lhs, rhs);
        fmpq_poly_add(lhs, a, b);
        fmpq_poly_scalar_mul_mpz(lhs, lhs, m);

        cflags |= fmpq_poly_is_canonical(lhs) ? 0 : 1;
        cflags |= fmpq_poly_is_canonical(rhs) ? 0 : 2;
        result = (fmpq_poly_equal(lhs, rhs) && !cflags);
        if (!result)
        {
            flint_printf("FAIL:\n");
            fmpq_poly_debug(a), flint_printf("\n\n");
            fmpq_poly_debug(b), flint_printf("\n\n");
            flint_printf("cflags = %wu\n\n", cflags);
            abort();
        }

        fmpz_clear(n);
        mpz_clear(m);
        fmpq_poly_clear(a);
        fmpq_poly_clear(b);
        fmpq_poly_clear(lhs);
        fmpq_poly_clear(rhs);
    }

    /* Compare with fmpq_poly_scalar_mul_si */
    for (i = 0; i < 100 * flint_test_multiplier(); i++)
    {
        fmpq_poly_t a, b;
        mpz_t n1;
        slong n;

        n = z_randtest(state);
        mpz_init(n1);
        flint_mpz_set_si(n1, n);

        fmpq_poly_init(a);
        fmpq_poly_init(b);
        fmpq_poly_randtest(a, state, n_randint(state, 100), n_randint(state, 200));

        fmpq_poly_scalar_mul_mpz(b, a, n1);
        fmpq_poly_scalar_mul_si(a, a, n);

        cflags |= fmpq_poly_is_canonical(a) ? 0 : 1;
        cflags |= fmpq_poly_is_canonical(b) ? 0 : 2;
        result = (fmpq_poly_equal(a, b) && !cflags);
        if (!result)
        {
            flint_printf("FAIL:\n");
            fmpq_poly_debug(a), flint_printf("\n\n");
            fmpq_poly_debug(b), flint_printf("\n\n");
            flint_printf("cflags = %wu\n\n", cflags);
            abort();
        }

        mpz_clear(n1);
        fmpq_poly_clear(a);
        fmpq_poly_clear(b);
    }

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