#include <cerrno>
#include <cstdlib>
#include <cstring>

#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>


#include <Device/DiskImage.h>
#include <File/MappedFile.h>

#include <ProFUSE/Exception.h>


using namespace Device;

using ProFUSE::Exception;
using ProFUSE::POSIXException;








unsigned DiskImage::ImageType(const char *type, unsigned defv)
{
    const char *tmp;
    
    if (type == 0 || *type == 0) return defv;
    
    // type could be a filename, in which case we check the extension.
    tmp = std::strrchr(type, '.');
    if (tmp) type = tmp + 1;
    if (*type == 0) return defv;
    
    
    if (::strcasecmp(type, "2mg") == 0)
        return '2IMG';
    if (::strcasecmp(type, "2img") == 0)
        return '2IMG';
        
    if (::strcasecmp(type, "dc42") == 0)
        return 'DC42';
        
    if (::strcasecmp(type, "po") == 0)
        return 'PO__';
    if (::strcasecmp(type, "dmg") == 0)
        return 'PO__';
        
    if (::strcasecmp(type, "dsk") == 0)
        return 'DO__';
    if (::strcasecmp(type, "do") == 0)
        return 'DO__';

    if (::strcasecmp(type, "dvx") == 0)
        return 'DVX_';        
    if (::strcasecmp(type, "davex") == 0)
        return 'DVX_';
        
    /*
    // not supported yet.        
    if (::strcasecmp(tmp, "sdk") == 0)
        return 'SDK_';
    */      
    return defv;
}



DiskImage::DiskImage(const char *name, bool readOnly)
{
    File fd(name, readOnly ? O_RDONLY : O_RDWR);
    MappedFile mf(fd, readOnly);
    _file.adopt(mf);
    
    _blocks = 0;
    _readOnly = readOnly;
    _adaptor = NULL;
}


DiskImage::DiskImage(MappedFile *file)
{
    _file.adopt(*file);

    _blocks = 0;
    _readOnly = file->readOnly();
    _adaptor = NULL;
}

DiskImage::~DiskImage()
{ 
    delete _adaptor;
}

bool DiskImage::readOnly()
{
    return _readOnly;
}

unsigned DiskImage::blocks()
{
    return _blocks;
}


void DiskImage::setAdaptor(Adaptor *adaptor)
{
    delete _adaptor;
    _adaptor = adaptor;
}


void DiskImage::read(unsigned block, void *bp)
{
#undef __METHOD__
#define __METHOD__ "DiskImage::read"

    if (block >= _blocks)
        throw Exception(__METHOD__ ": Invalid block.");
    
    _adaptor->readBlock(block, bp);    
}

void DiskImage::write(unsigned block, const void *bp)
{
#undef __METHOD__
#define __METHOD__ "DiskImage::write"
    
    if (block >= _blocks)
        throw Exception(__METHOD__ ": Invalid block.");
    
    _adaptor->writeBlock(block, bp);
}

void DiskImage::sync()
{
    #undef __METHOD__
    #define __METHOD__ "DiskImage::sync"
    
    if (_file.isValid()) return _file.sync();
    
    throw Exception(__METHOD__ ": File not set."); 
}



/*
ProDOSOrderDiskImage::ProDOSOrderDiskImage(const char *name, bool readOnly) :
    DiskImage(name, readOnly)
{
    Validate(file());
}
*/
 
ProDOSOrderDiskImage::ProDOSOrderDiskImage(MappedFile *file) :
    DiskImage(file)
{
    setBlocks(file->length() / 512);
    setAdaptor(new POAdaptor(file->address()));
}

ProDOSOrderDiskImage *ProDOSOrderDiskImage::Create(const char *name, size_t blocks)
{
    MappedFile *file = MappedFile::Create(name, blocks * 512);
    return new ProDOSOrderDiskImage(file);
}

ProDOSOrderDiskImage *ProDOSOrderDiskImage::Open(MappedFile *file)
{
    Validate(file);
    return new ProDOSOrderDiskImage(file);
}

void ProDOSOrderDiskImage::Validate(MappedFile *f)
{
    #undef __METHOD__
    #define __METHOD__ "ProDOSOrderDiskImage::Validate"
    
    if (!f || !f->isValid()) throw Exception(__METHOD__ ": File not set.");
    
    size_t size = f->length();
    
    if (size % 512)
        throw Exception(__METHOD__ ": Invalid file format.");
    
}

/*
DOSOrderDiskImage::DOSOrderDiskImage(const char *name, bool readOnly) :
    DiskImage(name, readOnly)
{    
    Validate(file());
}
*/

DOSOrderDiskImage::DOSOrderDiskImage(MappedFile *file) :
    DiskImage(file)
{
    setBlocks(file->length() / 512);
    setAdaptor(new DOAdaptor(file->address()));
}


DOSOrderDiskImage *DOSOrderDiskImage::Create(const char *name, size_t blocks)
{
    MappedFile *file = MappedFile::Create(name, blocks * 512);
    return new DOSOrderDiskImage(file);
}

DOSOrderDiskImage *DOSOrderDiskImage::Open(MappedFile *file)
{
    Validate(file);
    return new DOSOrderDiskImage(file);
}

void DOSOrderDiskImage::Validate(MappedFile *f)
{
    #undef __METHOD__
    #define __METHOD__ "DOSOrderDiskImage::Validate"

    if (!f || !f->isValid()) throw Exception(__METHOD__ ": File not set.");
    
    size_t size = f->length();
    
    if (size % 512)
        throw Exception(__METHOD__ ": Invalid file format.");
    
}