/* boost test_seed_seq.cpp
 *
 * Copyright Steven Watanabe 2010
 * Distributed under the Boost Software License, Version 1.0. (See
 * accompanying file LICENSE_1_0.txt or copy at
 * http://www.boost.org/LICENSE_1_0.txt)
 *
 * $Id$
 */

#include <boost/random/seed_seq.hpp>
#include <boost/assign/list_of.hpp>
#include <boost/config.hpp>
#include <vector>

#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp>

using boost::assign::list_of;

BOOST_AUTO_TEST_CASE(test_seed_seq) {
    boost::uint32_t expected_param[4] = { 2, 3, 4, 0xdeadbeaf };
    boost::uint32_t param[4] = { 2, 3, 4, 0xdeadbeaf };
    boost::uint32_t store32[10];
    boost::uint64_t store64[10];
    boost::uint32_t expected[10] = {
        3155793538u,
        2047427591u,
        2886057794u,
        280666868u,
        2184015838u,
        4035763234u,
        808987374u,
        3177165994u,
        2993445429u,
        3110180644u
    };
    std::fill_n(&store32[0], 10, 0);
    std::fill_n(&store64[0], 10, 0);
    boost::random::seed_seq seq;
    seq.generate(&store32[0], &store32[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store32[0], &store32[0] + 10, &expected[0], &expected[0] + 10);
    seq.generate(&store64[0], &store64[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store64[0], &store64[0] + 10, &expected[0], &expected[0] + 10);
    BOOST_CHECK_EQUAL(seq.size(), 0u);
    seq.param(&param[0]);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &param[0], &param[0] + 4, &expected_param[0], &expected_param[0] + 4);

    boost::uint32_t expected_r[10] = {
        2681148375u,
        3302224839u,
        249244011u,
        1549723892u,
        3429166360u,
        2812310274u,
        3902694127u,
        1014283089u,
        1122383019u,
        494552679u
    };

    std::vector<int> data = list_of(2)(3)(4);
    
    std::fill_n(&store32[0], 10, 0);
    std::fill_n(&store64[0], 10, 0);
    std::fill_n(&param[0], 3, 0);
    boost::random::seed_seq seq_r(data);
    seq_r.generate(&store32[0], &store32[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store32[0], &store32[0] + 10, &expected_r[0], &expected_r[0] + 10);
    seq_r.generate(&store64[0], &store64[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store64[0], &store64[0] + 10, &expected_r[0], &expected_r[0] + 10);
    BOOST_CHECK_EQUAL(seq_r.size(), 3u);
    seq_r.param(&param[0]);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &param[0], &param[0] + 4, &expected_param[0], &expected_param[0] + 4);
    
    std::fill_n(&store32[0], 10, 0);
    std::fill_n(&store64[0], 10, 0);
    std::fill_n(&param[0], 3, 0);
    boost::random::seed_seq seq_it(data.begin(), data.end());
    seq_it.generate(&store32[0], &store32[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store32[0], &store32[0] + 10, &expected_r[0], &expected_r[0] + 10);
    seq_it.generate(&store64[0], &store64[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store64[0], &store64[0] + 10, &expected_r[0], &expected_r[0] + 10);
    BOOST_CHECK_EQUAL(seq_it.size(), 3u);
    seq_it.param(&param[0]);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &param[0], &param[0] + 4, &expected_param[0], &expected_param[0] + 4);
    
#ifndef BOOST_NO_CXX11_HDR_INITIALIZER_LIST
    std::fill_n(&store32[0], 10, 0);
    std::fill_n(&store64[0], 10, 0);
    std::fill_n(&param[0], 3, 0);
    boost::random::seed_seq seq_il = {2, 3, 4};
    seq_il.generate(&store32[0], &store32[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store32[0], &store32[0] + 10, &expected_r[0], &expected_r[0] + 10);
    seq_il.generate(&store64[0], &store64[0] + 10);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store64[0], &store64[0] + 10, &expected_r[0], &expected_r[0] + 10);
    BOOST_CHECK_EQUAL(seq_il.size(), 3u);
    seq_il.param(&param[0]);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &param[0], &param[0] + 4, &expected_param[0], &expected_param[0] + 4);
#endif
}

BOOST_AUTO_TEST_CASE(test_seed_seq_short_output) {
    boost::uint32_t store32[2];

    boost::uint32_t expected_short[2] = {
        4149590228u,
        3175758659u
    };
    
    std::vector<int> data = list_of(2)(3)(4)(5);

    boost::random::seed_seq seq(data);

    seq.generate(&store32[0], &store32[0] + 2);
    BOOST_CHECK_EQUAL_COLLECTIONS(
        &store32[0], &store32[0] + 2, &expected_short[0], &expected_short[0] + 2);
}