/* 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/>.
 */

namespace dk {
	namespace implem {
		template <typename T, uint32_t D>
		class data_fetcher<T, D, true> {
		public:
			typedef typename BaseMapSource<D>::coords coords;
			static void fetch ( std::vector<T>& parOut, const coords& parFrom, const coords& parTo, std::size_t parCount, BaseMapSource<D>& parMapSrc ) {
				parOut.resize(parCount);
				parMapSrc.fetch_raw(reinterpret_cast<char*>(parOut.data()), parFrom, parTo, sizeof(T) * parCount);
			}
		};
		template <typename T, uint32_t D>
		class data_fetcher<T, D, false> {
		public:
			typedef typename BaseMapSource<D>::coords coords;
			static void fetch ( std::vector<T>& parOut, const coords& parFrom, const coords& parTo, std::size_t parCount, BaseMapSource<D>& parMapSrc ) {
				parOut.reserve(parCount);
				DK_ASSERT(false); //not implemented
				(void)parOut;
				(void)parFrom;
				(void)parTo;
				(void)parMapSrc;
			}
		};
	} //namespace implem

	template <uint32_t D>
	template <typename T>
	void BaseMapSource<D>::fetch (std::vector<T>& parOut, const coords& parFrom, const coords& parTo) {
		const auto tile_count = tile_volume<D>(parTo - parFrom);
		const std::size_t casted_tile_count = static_cast<std::size_t>(tile_count);
		DK_ASSERT(static_cast<decltype(tile_count)>(casted_tile_count) == tile_count);

		parOut.reserve(casted_tile_count);
		parOut.clear();
		implem::data_fetcher<T, D>::fetch(parOut, parFrom, parTo, casted_tile_count, *this);
	}
} //namespace dk