/******************************************************************************
 *
 * Purpose: Declaration of the PCIDSKFile Interface
 *
 ******************************************************************************
 * Copyright (c) 2009
 * PCI Geomatics, 90 Allstate Parkway, Markham, Ontario, Canada.
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/
#ifndef INCLUDE_PCIDSK_FILE_H
#define INCLUDE_PCIDSK_FILE_H

#include "pcidsk_segment.h"
#include <string>
#include <vector>
#include <map>
#include <functional>
#include <algorithm>

namespace PCIDSK
{
/************************************************************************/
/*                              PCIDSKFile                              */
/************************************************************************/
    static bool CheckSegNamesEqual(const char * pszName, unsigned nSize,
                                   const char * pszCheckName, unsigned nCheckSize)
    {
        if(nCheckSize == 0)
            return true;
        int nFirstSize = std::min(nCheckSize, nSize);
        if(!std::equal(pszName, pszName + nFirstSize, pszCheckName))
            return false;
        //make sure the rest of the string is just whitespace
        for(unsigned i = nFirstSize; i < nSize; i++)
            if(pszName[i] != ' ')
                return false;
        return true;
    }

    class PCIDSKChannel;
    class PCIDSKSegment;
    class PCIDSKInterfaces;
    class Mutex;

//! Top interface to PCIDSK (.pix) files.
    class PCIDSK_DLL PCIDSKFile
    {
    public:
        virtual ~PCIDSKFile() {}

        virtual PCIDSKInterfaces *GetInterfaces() = 0;

        virtual PCIDSKChannel  *GetChannel( int band ) = 0;
        virtual PCIDSKSegment  *GetSegment( int segment ) = 0;

        virtual PCIDSK::PCIDSKSegment *
            GetSegment( int type, const std::string & name, int previous = 0 ) = 0;
        virtual unsigned GetSegmentID(int segment, const std::string & name = {},
                                      unsigned previous = 0) const = 0;
        virtual std::vector<unsigned> GetSegmentIDs(int segment,
                 const std::function<bool(const char *, unsigned)> & oFilter) const = 0;
        std::vector<unsigned> GetSegmentIDs(int segment) const
        {
            static const std::function<bool(const char *, unsigned)> oTrue =
                [](const char *, unsigned) { return true; };
            return GetSegmentIDs(segment, oTrue);
        }
        std::vector<unsigned> GetSegmentIDs(int segment, const std::string & name) const
        {
            std::function<bool(const char *, unsigned)> oCheck =
                [&name](const char * pszName, unsigned nSize)
                {
                    return CheckSegNamesEqual(pszName, nSize, name.c_str(),
                                              (unsigned)name.size());
                };
            return GetSegmentIDs(segment, std::move(oCheck));
        }

        virtual int GetWidth() const = 0;
        virtual int GetHeight() const = 0;
        virtual int GetChannels() const = 0;
        virtual std::string GetInterleaving() const = 0;
        virtual bool GetUpdatable() const = 0;
        virtual uint64 GetFileSize() const = 0;

        virtual int  CreateSegment( std::string name, std::string description,
            eSegType seg_type, int data_blocks ) = 0;
        virtual void DeleteSegment( int segment ) = 0;
        virtual void CreateOverviews( int chan_count, const int *chan_list,
            int factor, std::string resampling ) = 0;

    // the following are only for pixel interleaved IO
        virtual int    GetPixelGroupSize() const = 0;
        virtual void *ReadAndLockBlock( int block_index, int xoff=-1, int xsize=-1) = 0;
        virtual void  UnlockBlock( bool mark_dirty = false ) = 0;

    // low level io, primarily internal.
        virtual void WriteToFile( const void *buffer, uint64 offset, uint64 size)=0;
        virtual void ReadFromFile( void *buffer, uint64 offset, uint64 size ) = 0;

        virtual void GetIODetails( void ***io_handle_pp, Mutex ***io_mutex_pp,
                                   const std::string& filename=std::string(), bool writable=false ) = 0;

        virtual std::string GetUniqueEDBFilename() = 0;

        virtual std::map<int,int> GetEDBChannelMap(std::string oExtFilename) = 0;

        virtual std::string GetMetadataValue( const std::string& key ) = 0;
        virtual void SetMetadataValue( const std::string& key, const std::string& value ) = 0;
        virtual std::vector<std::string> GetMetadataKeys() = 0;

        virtual void Synchronize() = 0;
    };
} // end namespace PCIDSK

#endif // INCLUDE_PCIDSK_FILE_H