/* 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/>.
 */

#ifndef id0ADBCC15BA574485BF3267254090D99B
#define id0ADBCC15BA574485BF3267254090D99B

#include "doorkeeper/primitivetypes.hpp"
#include "doorkeeper/components/tileiterator.hpp"
#include "doorkeeper/components/layer.hpp"
#include "doorkeeper/components/tilecoords.hpp"
#include <cstdint>
#include <cmath>
#include <boost/functional/hash_fwd.hpp>

namespace dk {
	template <uint32_t D>
	class Tyler;

	template <typename T, uint32_t D>
	class Layer;

	template <uint32_t D>
	struct TileInfo {
		typedef Vector<D> coords;

		TileInfo ( const LayerBase<D>& parLayer );

		coords tile_size;
		coords map_size;
	};

	template <uint32_t D>
	std::size_t hash_value ( const TileInfo<D>& parTProps ) noexcept a_pure;

	template <uint32_t D>
	class Viewport {
	public:
		typedef Vector<D> coords;
		typedef VectorT<CoordinateAccumType, D> coords_f;

		Viewport ( const Viewport& parOther ) = default;
		Viewport ( Tyler<D>& parTyler, const TileInfo<D>* parTileInfo );
		Viewport ( Tyler<D>& parTyler, const TileInfo<D>* parTileInfo, const coords& parPos );
		~Viewport ( void ) noexcept = default;

		Viewport& operator= ( const Viewport& ) = default;
		Viewport& operator+= ( const coords_f& parValue );
		Viewport& operator-= ( const coords_f& parValue );

		void setFrom ( const coords& parFrom );
		coords size ( void ) const;
		coords pixel_offset ( void ) const;

		template <typename T>
		typename Layer<T, D>::iterator begin ( Layer<T, D>& parLayer ) const;
		template <typename T>
		typename Layer<T, D>::iterator end ( Layer<T, D>& parLayer ) const;
		template <typename T> inline
		typename Layer<T, D>::const_iterator begin ( const Layer<T, D>& parLayer ) const a_always_inline;
		template <typename T> inline
		typename Layer<T, D>::const_iterator end ( const Layer<T, D>& parLayer ) const a_always_inline;
		template <typename T>
		typename Layer<T, D>::const_iterator cbegin ( const Layer<T, D>& parLayer ) const;
		template <typename T>
		typename Layer<T, D>::const_iterator cend ( const Layer<T, D>& parLayer ) const;

		void set_tile_info ( const TileInfo<D>* parTileInfo );

	private:
		void clip_pixel_offset ( void );

		TileCoords<D> m_view;
		coords_f m_pixel_offset;
		Tyler<D>& m_tyler;
		const TileInfo<D>* const m_tile_info;
	};
} //namespace dk

#include "doorkeeper/implem/viewport.inl"

#endif