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#include "zipexcptn.hxx"
#include "internal/zipfile.hxx"
#include "internal/global.hxx"

#include <malloc.h>
#include <algorithm>
#include <functional>

#include <string.h>

namespace internal
{
    /* for case in-sensitive string comparison */
    struct stricmp : public std::unary_function<std::string, bool>
    {
        stricmp(const std::string& str) : str_(str)
        {}

        bool operator() (const std::string& other)
        { return (0 == _stricmp(str_.c_str(), other.c_str())); }

        std::string str_;
    };
} // namespace internal

/** Checks whether a file is a zip file or not

    @precond    The given parameter must be a string with length > 0
            The file must exist
            The file must be readable for the current user

    @returns    true if the file is a zip file
            false if the file is not a zip file

    @throws ParameterException if the given file name is empty
            IOException if the specified file doesn't exist
            AccessViolationException if read access to the file is denied
*/
bool ZipFile::IsZipFile(const std::string& /*FileName*/)
{
    return true;
}

bool ZipFile::IsZipFile(void* /*stream*/)
{
    return true;
}


/** Returns wheter the version of the specified zip file may be uncompressed with the
          currently used zlib version or not

    @precond    The given parameter must be a string with length > 0
            The file must exist
            The file must be readable for the current user
            The file must be a valid zip file

    @returns    true if the file may be uncompressed with the currently used zlib
            false if the file may not be uncompressed with the currently used zlib

    @throws ParameterException if the given file name is empty
            IOException if the specified file doesn't exist or is no zip file
            AccessViolationException if read access to the file is denied
*/
bool ZipFile::IsValidZipFileVersionNumber(const std::string& /*FileName*/)
{
    return true;
}

bool ZipFile::IsValidZipFileVersionNumber(void* /* stream*/)
{
    return true;
}


/** Constructs a zip file from a zip file

    @precond    The given parameter must be a string with length > 0
            The file must exist
            The file must be readable for the current user

    @throws ParameterException if the given file name is empty
            IOException if the specified file doesn't exist or is no valid zip file
            AccessViolationException if read access to the file is denied
            WrongZipVersionException if the zip file cannot be uncompressed
            with the used zlib version
*/
ZipFile::ZipFile(const std::string& FileName)
{
    m_uzFile = unzOpen(FileName.c_str());

    if (0 == m_uzFile)
        throw IOException(-1);
}

ZipFile::ZipFile(void* stream, zlib_filefunc_def* fa)
{
    fa->opaque = stream;
    m_uzFile = unzOpen2((const char *)NULL, fa);

    if (0 == m_uzFile)
        throw IOException(-1);
}


/** Destroys a zip file
*/
ZipFile::~ZipFile()
{
    unzClose(m_uzFile);
}

/** Provides an interface to read the uncompressed data of a content of the zip file

    @precond    The specified content must exist in this file
            ppstm must not be NULL
*/
void ZipFile::GetUncompressedContent(
    const std::string& ContentName, /*inout*/ ZipContentBuffer_t& ContentBuffer)
{
    int rc = unzLocateFile(m_uzFile, ContentName.c_str(), 0);

    if (UNZ_END_OF_LIST_OF_FILE == rc)
        throw ZipContentMissException(rc);

    unz_file_info finfo;
    unzGetCurrentFileInfo(m_uzFile, &finfo, 0, 0, 0, 0, 0, 0);

    ContentBuffer.resize(finfo.uncompressed_size);

    rc = unzOpenCurrentFile(m_uzFile);

    if (UNZ_OK != rc)
        throw ZipException(rc);

    rc = unzReadCurrentFile(m_uzFile, &ContentBuffer[0], finfo.uncompressed_size);

    if (rc < 0)
        throw ZipException(rc);

    rc = unzCloseCurrentFile(m_uzFile);

    if (rc < 0)
        throw ZipException(rc);
}

/** Returns a list with the content names contained within this file

*/
ZipFile::DirectoryPtr_t ZipFile::GetDirectory() const
{
    DirectoryPtr_t dir(new Directory_t());

    long lmax = GetFileLongestFileNameLength() + 1;
    char* szFileName = reinterpret_cast<char*>(_alloca(lmax));

    if (!szFileName)
        throw ZipException(ERROR_NOT_ENOUGH_MEMORY);

    int rc = unzGoToFirstFile(m_uzFile);

    while (UNZ_OK == rc && UNZ_END_OF_LIST_OF_FILE != rc)
    {
        unzGetCurrentFileInfo(
            m_uzFile, 0, szFileName, lmax, 0, 0, 0, 0);

        dir->push_back(szFileName);

        rc = unzGoToNextFile(m_uzFile);
    }

    if (UNZ_OK != rc && UNZ_END_OF_LIST_OF_FILE != rc)
        throw ZipException(rc);

    return dir;
}

/** Convinience query function may even realized with
    iterating over a ZipFileDirectory returned by
    GetDirectory */
bool ZipFile::HasContent(const std::string& ContentName) const
{
    //#i34314# we need to compare package content names
    //case in-sensitive as it is not defined that such
    //names must be handled case sensitive
    DirectoryPtr_t dir = GetDirectory();
    Directory_t::iterator iter =
        std::find_if(dir->begin(), dir->end(), internal::stricmp(ContentName));

    return (iter != dir->end());
}


/** Returns the length of the longest file name
        in the current zip file
*/
long ZipFile::GetFileLongestFileNameLength() const
{
    long lmax = 0;
    unz_file_info finfo;

    int rc = unzGoToFirstFile(m_uzFile);

    while (UNZ_OK == rc && UNZ_END_OF_LIST_OF_FILE != rc)
    {
        unzGetCurrentFileInfo(m_uzFile, &finfo, 0, 0, 0, 0, 0, 0);
        lmax = std::max<long>(lmax, finfo.size_filename);
        rc = unzGoToNextFile(m_uzFile);
    }

    if (UNZ_OK != rc && UNZ_END_OF_LIST_OF_FILE != rc)
        throw ZipException(rc);

    return lmax;
}

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