/*
 Copyright (C) 2009 erik

 This program 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 2 of the License, or
 (at your option) any later version.

 This program 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 this program; if not, write to the Free Software Foundation,
 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef TERRAINPAGEDATAPROVIDER_H_
#define TERRAINPAGEDATAPROVIDER_H_

#include "domain/Types.h"
#include <OgrePrerequisites.h>

#include <memory>


namespace Ember::OgreView {

namespace Terrain {
class TerrainHandler;

class TerrainPage;

class ITerrainPageBridge;
}

/**
 * @brief Page data for one page in the terrain rendering system.
 */
struct IPageData {
	virtual ~IPageData() = default;

	virtual Ogre::MaterialPtr getMaterial() = 0;

	virtual Ogre::MaterialPtr getCompositeMapMaterial() = 0;
};


/**
 * @brief Provides IPageData instances for the terrain rendering system.
 */
struct IPageDataProvider {
	virtual ~IPageDataProvider() = default;

	typedef std::pair<long, long> OgreIndex;

	virtual std::unique_ptr<IPageData> getPageData(const OgreIndex& index) = 0;
};


/**
 * @brief Page data as provided by the Mercator based terrain system.
 */
class TerrainPageData : public IPageData {
public:
	explicit TerrainPageData(std::shared_ptr<Terrain::TerrainPage> page);

	~TerrainPageData() override = default;

	Ogre::MaterialPtr getMaterial() override;

	Ogre::MaterialPtr getCompositeMapMaterial() override;

private:
	std::shared_ptr<Terrain::TerrainPage> mPage;

};

/**
 * @brief Provides terrain data from the Mercator based terrain system.
 */
class TerrainPageDataProvider : public IPageDataProvider {
public:
	explicit TerrainPageDataProvider(Terrain::TerrainHandler& hander);

	~TerrainPageDataProvider() override = default;

	std::unique_ptr<IPageData> getPageData(const OgreIndex& ogreIndexPosition) override;

protected:
	Terrain::TerrainHandler& mHandler;

	/**
	 * @brief Converts the ogre index position to wf local index.
	 */
	static TerrainIndex convertToWFTerrainIndex(const OgreIndex& ogreIndexPosition);

};

}



#endif /* TERRAINPAGEDATAPROVIDER_H_ */
