/* Copyright 2015, Michele Santullo
 * This file is part of DoorKeeper.
 *
 * DoorKeeper 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 3 of the License, or
 * (at your option) any later version.
 *
 * DoorKeeper 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 DoorKeeper.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <gtest/gtest.h>
#include "doorkeeper/implem/idmanager.hpp"

TEST(components, saltedid) {
	typedef dk::IDManager<5, 11> id_manager_t;
	id_manager_t idman;

	EXPECT_EQ(2, sizeof(idman.allocate()));
	EXPECT_EQ(1, sizeof(id_manager_t::value_type::salt_type));
	EXPECT_EQ(2, sizeof(id_manager_t::value_type::index_type));
	EXPECT_EQ(16, id_manager_t::bit_count);

	for (unsigned int z = 0; z < 20; ++z) {
		auto index = idman.allocate();
		EXPECT_EQ(0, index.salt());
		EXPECT_EQ(z + 1, index.index());
	}
	auto free_index = idman.allocate();
	EXPECT_EQ(0, free_index.salt());
	for (unsigned int z = 0; z < 20; ++z) {
		auto index = idman.allocate();
		EXPECT_EQ(0, index.salt());
		EXPECT_EQ(z + 22, index.index());
	}

	for (unsigned int z = 0; z < (1 << 5) - 1; ++z) {
		idman.free(free_index);
		free_index = idman.allocate();
		EXPECT_EQ(z + 1, free_index.salt());
		EXPECT_EQ(21, free_index.index());
	}

	idman.free(free_index);
	free_index = idman.allocate();
	EXPECT_EQ(0, free_index.salt());
	EXPECT_EQ(42, free_index.index());
}