/*
    Copyright (C) 2014 Fredrik Johansson

    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 "fmpz_mod_poly.h"
#include "ulong_extras.h"

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

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

    fmpz_mod_ctx_init_ui(ctx, 2);

    for (i = 0; i < 1000 * flint_test_multiplier(); i++)
    {
        fmpz_mod_poly_t a, b, c;
        fmpz_t p;
        slong n;

        fmpz_init(p);

        fmpz_set_ui(p, n_randtest_prime(state, 0));
        fmpz_mod_ctx_set_modulus(ctx, p);

        fmpz_mod_poly_init(a, ctx);
        fmpz_mod_poly_init(b, ctx);
        fmpz_mod_poly_init(c, ctx);

        fmpz_mod_poly_randtest(a, state, n_randint(state, 100), ctx);
        fmpz_mod_poly_randtest(b, state, n_randint(state, 100), ctx);
        n = n_randint(state, 50);

        fmpz_mod_poly_set_trunc(b, a, n, ctx);
        fmpz_mod_poly_set(c, a, ctx);
        fmpz_mod_poly_truncate(c, n, ctx);

        result = (fmpz_mod_poly_equal(b, c, ctx));
        if (!result)
        {
            flint_printf("FAIL:\n");
            fmpz_mod_poly_print(a, ctx), flint_printf("\n\n");
            fmpz_mod_poly_print(b, ctx), flint_printf("\n\n");
            fmpz_mod_poly_print(c, ctx), flint_printf("\n\n");
            flint_abort();
        }

        fmpz_mod_poly_set_trunc(a, a, n, ctx);

        result = (fmpz_mod_poly_equal(a, c, ctx));
        if (!result)
        {
            flint_printf("FAIL (aliasing):\n");
            fmpz_mod_poly_print(a, ctx), flint_printf("\n\n");
            fmpz_mod_poly_print(c, ctx), flint_printf("\n\n");
            flint_abort();
        }

        fmpz_clear(p);

        fmpz_mod_poly_clear(a, ctx);
        fmpz_mod_poly_clear(b, ctx);
        fmpz_mod_poly_clear(c, ctx);
    }

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