/**
 * MIT License
 *
 * Copyright (c) 2017 Thibaut Goetghebuer-Planchon <tessil@gmx.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#define BOOST_TEST_DYN_LINK

#include <tsl/robin_growth_policy.h>

#include <boost/mpl/list.hpp>
#include <boost/test/unit_test.hpp>
#include <cstddef>
#include <limits>
#include <ratio>
#include <stdexcept>

#include "utils.h"

BOOST_AUTO_TEST_SUITE(test_policy)

using test_types = boost::mpl::list<tsl::rh::power_of_two_growth_policy<2>, tsl::rh::power_of_two_growth_policy<4>,
                                    tsl::rh::prime_growth_policy, tsl::rh::mod_growth_policy<>,
                                    tsl::rh::mod_growth_policy<std::ratio<7, 2>>>;

BOOST_AUTO_TEST_CASE_TEMPLATE(test_policy, Policy, test_types)
{
    // Call next_bucket_count() on the policy until we reach its
    // max_bucket_count()
    std::size_t bucket_count = 0;
    Policy policy(bucket_count);

    BOOST_CHECK_EQUAL(policy.bucket_for_hash(0), 0);
    BOOST_CHECK_EQUAL(bucket_count, 0);

#ifndef TSL_RH_NO_EXCEPTIONS
    bool exception_thrown = false;
    try {
        while (true) {
            const std::size_t previous_bucket_count = bucket_count;

            bucket_count = policy.next_bucket_count();
            policy = Policy(bucket_count);

            BOOST_CHECK_EQUAL(policy.bucket_for_hash(0), 0);
            BOOST_CHECK(bucket_count > previous_bucket_count);
        }
    } catch (const std::length_error&) {
        exception_thrown = true;
    }

    BOOST_CHECK(exception_thrown);
#endif
}

BOOST_AUTO_TEST_CASE_TEMPLATE(test_policy_min_bucket_count, Policy, test_types)
{
    // Check policy when a bucket_count of 0 is asked.
    std::size_t bucket_count = 0;
    Policy policy(bucket_count);

    BOOST_CHECK_EQUAL(policy.bucket_for_hash(0), 0);
}

BOOST_AUTO_TEST_CASE_TEMPLATE(test_policy_max_bucket_count, Policy, test_types)
{
    // Test a bucket_count equals to the max_bucket_count limit and above
    std::size_t bucket_count = 0;
    Policy policy(bucket_count);

    bucket_count = policy.max_bucket_count();
    Policy policy2(bucket_count);

    bucket_count = std::numeric_limits<std::size_t>::max();
    TSL_RH_CHECK_THROW((Policy(bucket_count)), std::length_error);

    bucket_count = policy.max_bucket_count() + 1;
    TSL_RH_CHECK_THROW((Policy(bucket_count)), std::length_error);
}

BOOST_AUTO_TEST_SUITE_END()
