/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2017                                                               *
 *                                                                                       *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
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 * permit persons to whom the Software is furnished to do so, subject to the following   *
 * conditions:                                                                           *
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 * 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,   *
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 ****************************************************************************************/

#ifndef __OPENSPACE_MODULE_GLOBEBROWSING___TILELOADJOB___H__
#define __OPENSPACE_MODULE_GLOBEBROWSING___TILELOADJOB___H__

#include <modules/globebrowsing/tile/tile.h>
#include <openspace/util/concurrentjobmanager.h>

namespace openspace::globebrowsing {

class RawTileDataReader;
struct RawTile;

struct TileLoadJob : public Job<RawTile> {
    /**
     * Allocates enough data for one tile. When calling <code>product()</code>, the
     * ownership of this data will be released. If <code>product()</code> has not been
     * called before the TileLoadJob is finished, the data will be deleted as it has not
     * been exposed outside of this object.
     */
    TileLoadJob(std::shared_ptr<RawTileDataReader> rawTileDataReader,
        const TileIndex& tileIndex);
    
    /**
     * No data is allocated unless specified so by the TileTextureInitData of
     * rawTileDataReader but it is assumed that pboDataPtr is a mapped pointer to a pixel
     * buffer object. 
     */
    TileLoadJob(std::shared_ptr<RawTileDataReader> rawTileDataReader,
        const TileIndex& tileIndex, char* pboDataPtr);

    /**
     * Destroys the allocated data pointer if it has been allocated and the TileLoadJob
     * has ownership of it.
     */
    ~TileLoadJob();

    /**
     * If the TileLoadJob has been created using PBO, this is the address that the
     * RawTileDataReader will read to. In case specified so in the TileTextureInitData
     * of RawTileDataReader, the data will also be written to CPU memory.
     */
    void execute() override;

    /**
    * Marks the job as finised and releases ownership of the data.
    * Unless the job is marked as finished, the pixel data will be deallocated
    * when the job is deleted.
    */
    std::shared_ptr<RawTile> product() override;

    /**
     * Get the data ownership. if any data has been allocated (ie if the job was created
     * using the CPU constructor not taking a PBO data pointer) this function is
     * equivalent with asking if the job is unfinished. If the job has ownership of data,
     * the data will be deleted once the job is deleted.
     */
    bool hasOwnershipOfData() const;

protected:
    std::shared_ptr<RawTileDataReader> _rawTileDataReader;
    std::shared_ptr<RawTile> _rawTile;
    TileIndex _chunkIndex;
    char* _pboMappedDataDestination;
    bool _hasOwnershipOfData;
};

} // namespace openspace::globebrowsing

#endif // __OPENSPACE_MODULE_GLOBEBROWSING___TILELOADJOB___H__