//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//

#ifndef IMFMULTIPARTINPUTFILE_H_
#define IMFMULTIPARTINPUTFILE_H_

#include "ImfForward.h"

#include "ImfGenericInputFile.h"
#include "ImfThreading.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER


class IMF_EXPORT_TYPE MultiPartInputFile : public GenericInputFile
{
  public:
    IMF_EXPORT
    MultiPartInputFile(const char fileName[],
                       int numThreads = globalThreadCount(),
                       bool reconstructChunkOffsetTable = true);

    IMF_EXPORT
    MultiPartInputFile(IStream& is,
                       int numThreads = globalThreadCount(),
                       bool reconstructChunkOffsetTable = true);

    IMF_EXPORT
    virtual ~MultiPartInputFile();

    // ----------------------
    // Count of number of parts in file
    // ---------------------
    IMF_EXPORT
    int parts() const;
    
    
    //----------------------
    // Access to the headers
    //----------------------

    IMF_EXPORT
    const Header &  header(int n) const;
    

    //----------------------------------
    // Access to the file format version
    //----------------------------------

    IMF_EXPORT
    int			    version () const;


    // =----------------------------------------
    // Check whether the entire chunk offset
    // table for the part is written correctly
    // -----------------------------------------
    IMF_EXPORT
    bool partComplete(int part) const;


    // ----------------------------------------
    // Flush internal part cache
    // Invalidates all 'Part' types previously
    // constructed from this file
    // Intended for test purposes, but can be
    // used to temporarily reduce memory overhead,
    // or to switch between types (e.g. TiledInputPart
    // or DeepScanLineInputPart to InputPart)
    // ----------------------------------------

    IMF_EXPORT
    void flushPartCache();
    struct IMF_HIDDEN Data;


  private:
    Data*                           _data;

    MultiPartInputFile(const MultiPartInputFile &) = delete;
    MultiPartInputFile& operator = (const MultiPartInputFile &) = delete;
    MultiPartInputFile(MultiPartInputFile &&) = delete;
    MultiPartInputFile& operator = (MultiPartInputFile &&) = delete;

    
    //
    // used internally by 'Part' types to access individual parts of the multipart file
    //
    template<class T> IMF_HIDDEN T*    getInputPart(int partNumber);
    IMF_HIDDEN InputPartData*          getPart(int);
    
    IMF_HIDDEN void                    initialize();


    

    friend class InputPart;
    friend class ScanLineInputPart;
    friend class TiledInputPart;
    friend class DeepScanLineInputPart;
    friend class DeepTiledInputPart;

    //
    // For backward compatibility.
    //

    friend class InputFile;
    friend class TiledInputFile;
    friend class ScanLineInputFile;
    friend class DeepScanLineInputFile;
    friend class DeepTiledInputFile;
};


OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif /* IMFMULTIPARTINPUTFILE_H_ */