/*
    Copyright (C) 2015 Vladimir Glazachev

    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 "aprcl.h"

int main(void)
{
    int i, j;
    FLINT_TEST_INIT(state);
   
    flint_printf("unity_zp_mul....");
    fflush(stdout);

    /* test that \zeta_p^i * \zeta_p^j computest correctly */
    for (i = 0; i < 10 * flint_test_multiplier(); i++)
    {
        ulong p, ind1, ind2;
        fmpz_t n;
        unity_zp f, g, h1, h2;

        p = n_randprime(state, 2 + n_randint(state, 6), 0);

        fmpz_init(n);
        fmpz_randtest_unsigned(n, state, 200);
        while (fmpz_equal_ui(n, 0) != 0)
            fmpz_randtest_unsigned(n, state, 200);

        unity_zp_init(f, p, 1, n);
        unity_zp_init(g, p, 1, n);
        unity_zp_init(h1, p, 1, n);
        unity_zp_init(h2, p, 1, n);

        ind1 = n_randint(state, p);
        unity_zp_coeff_set_ui(h1, ind1, 1);

        ind2 = n_randint(state, p);
        unity_zp_coeff_set_ui(h2, ind2, 1);

        ind1 = (ind1 + ind2) % p;
        unity_zp_coeff_set_ui(g, ind1, 1);
        unity_zp_mul(f, h1, h2);

        if (unity_zp_equal(f, g) == 0)
        {
            flint_printf("FAIL\n");
            abort();
        }
    
        fmpz_clear(n);
        unity_zp_clear(f);
        unity_zp_clear(g);
        unity_zp_clear(h1);
        unity_zp_clear(h2);
    }

    /* test commutative */
    for (i = 0; i < 10 * flint_test_multiplier(); i++)
    {
        ulong p;
        fmpz_t n;
        unity_zp f, g, h1, h2;

        p = n_randprime(state, 2 + n_randint(state, 6), 0);

        fmpz_init(n);
        fmpz_randtest_unsigned(n, state, 200);
        while (fmpz_equal_ui(n, 0) != 0)
            fmpz_randtest_unsigned(n, state, 200);

        unity_zp_init(f, p, 1, n);
        unity_zp_init(g, p, 1, n);
        unity_zp_init(h1, p, 1, n);
        unity_zp_init(h2, p, 1, n);

        for (j = 0; j < 100; j++)
        {
            ulong ind;
            fmpz_t val1, val2;

            fmpz_init(val1);
            fmpz_init(val2);

            ind = n_randint(state, p);
            
            fmpz_randtest_unsigned(val1, state, 200);
            fmpz_randtest_unsigned(val2, state, 200);

            unity_zp_coeff_set_fmpz(h1, ind, val1);
            unity_zp_coeff_set_fmpz(h2, ind, val2);

            fmpz_clear(val1);
            fmpz_clear(val2);
        }

        unity_zp_mul(f, h1, h2);
        unity_zp_mul(g, h2, h1);

        if (unity_zp_equal(f, g) == 0)
        {
            flint_printf("FAIL\n");
            abort();
        }
    
        fmpz_clear(n);
        unity_zp_clear(f);
        unity_zp_clear(g);
        unity_zp_clear(h1);
        unity_zp_clear(h2);
    }

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