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/*
* Name....: stringutil.cpp
* Date....: 09/02/99
* Creator.: 
*
* This module implements the cStringUtil class and helpers. This class,
* primarily, is used to convert between various character formats. The
* supported formats include:
*
*       NTWCS - using 32-bit wchar_t
*       NTWCS - using 16-bit wchar_t
*       NTMBS - using integral char's
*
* PLEASE NOTE:
*   Refrain from using the StrToTStr, TStrToStr, WStrToTStr, and
*   etc calls and instead use the type dispatched member:
*
*       DestT::const_iterator Convert( DestT&, const SrcT& );
*
*   It can be used like so:
*
*       TSTRING tstr;
*       TCOUT << cStringUtil::Convert( tstr, sUnknownType );
*
*   This call makes our code more portable and extensible by not embedding
*   type selection in the names of interfaces. For example:
*
*       std::string s1 = cStringUtil::TStrToStr( TSTRING( "Huh" ) );
*
*   Can be rewritten as:
*
*       std::string s1;
*       cStringUtil::Convert( s1, TSTRING( "Huh" ) );
*/

/// Requirements

#include "stdcore.h" // for: pch

#include "stringutil.h"  // for: These Declarations
#include "debug.h"       // for: Debugging Interface
#include "codeconvert.h" // for: iconv abstractions
#include "ntmbs.h"       // for: eCharacterEncoding
#include "hashtable.h"


//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// String Cache
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

// TODO:BAM -- use these for mb -> UCS2 conversions as well?

class tss_hash_key_convert
{
public:
    const uint8_t* operator()(const wc16_string& s, int* const pcbKeyLen)
    {
        *pcbKeyLen = sizeof(WCHAR16) * s.length();
        return (uint8_t*)s.c_str();
    }
};

class tss_hash_key_compare
{
public:
    bool operator()(const wc16_string& lhs, const wc16_string& rhs)
    {
        return (lhs.compare(rhs) == 0);
    }
};

namespace /* Module Local */
{
typedef cHashTable<wc16_string, TSTRING, tss_hash_key_compare, tss_hash_key_convert> hashtable_t;

hashtable_t& tss_GetHashTable()
{
    static hashtable_t s_table;
    return s_table;
}
} // namespace


inline void tss_insert_in_hash(const wc16_string& lhs, const TSTRING& rhs)
{
    tss_GetHashTable().Insert(lhs, rhs);
}

inline bool tss_find_in_hash(const wc16_string& lhs, TSTRING& rhs)
{
    return (tss_GetHashTable().Lookup(lhs, rhs));
}


//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// Type Dispatched Conversions
//- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

/*static*/
std::string::const_iterator cStringUtil::Convert(std::string& nbs, const wc16_string& dbs)
{
#if IS_AROS
    nbs.resize(dbs.length());
    for (int x = 0; x < dbs.length(); ++x)
        nbs[x] = (unsigned char)dbs[x];
#else
    cDebug d("cStringUtil::Convert( char, w16 )");

    ASSERT((void*)nbs.c_str() != (void*)dbs.c_str());

    if (dbs.empty())
        nbs.erase();
    else
    {
        if (tss_find_in_hash(dbs, nbs))
        {
            d.TraceNever(_T("found string in hash table\n"));
            return nbs.begin();
        }
        else
        {
            d.TraceNever(_T("didn't find string in hash table\n"));
        }

        /*
        d.TraceDebug( _T("converting: \n") );
        for( int i = 0; i < dbs.size(); i++ )
            d.TraceDebug( _T("0x%04X\n"), dbs[i] );
        d.TraceDebug( _T("----\n") );
        */

        nbs.resize(dbs.size() * MB_CUR_MAX);

        int nWrote = iCodeConverter::GetInstance()->Convert(
            (char*)nbs.c_str(), nbs.size(), dbs.c_str(), dbs.size()); // c_str() because must be null terminated

        d.TraceDetail(_T("iCodeConverter returned %d\n"), nWrote);

        if (nWrote == -1)
            throw eCharacterEncoding(TSS_GetString(cCore, core::STR_ERR_BADCHAR));

        nbs.resize(nWrote);

        tss_insert_in_hash(dbs, nbs);
    }

#endif
    return nbs.begin();
}

/*static*/
wc16_string::const_iterator cStringUtil::Convert(wc16_string& dbs, const std::string& nbs)
{
#if IS_AROS
    dbs.resize(nbs.length());
    for (int x = 0; x < nbs.length(); x++)
        dbs[x] = (unsigned short)nbs[x];
#else

    cDebug d("cStringUtil::Convert( w16, char )");

    if (nbs.size() != 0)
    {
        dbs.resize(nbs.size());

        // d.TraceDebug( "converting <%s>\n", nbs.c_str() );

        int nWrote = iCodeConverter::GetInstance()->Convert(
            (WCHAR16*)dbs.c_str(), dbs.length(), nbs.c_str(), nbs.size()); // c_str() because must be null terminated

        d.TraceDetail(_T("iCodeConverter returned %d\n"), nWrote);

        if (nWrote == -1)
        {
            throw eCharacterEncoding(TSS_GetString(cCore, core::STR_ERR_BADCHAR));
        }

        dbs.resize(nWrote);

        /*
        d.TraceDebug( _T("converted to: \n") );
        for( int i = 0; i < dbs.size(); i++ )
            d.TraceDebug( _T("0x%04X\n"), dbs[i] );
        d.TraceDebug( _T("----\n") );
        */
    }
    else
        dbs.resize(0);
#endif

    return dbs.begin();
}

#if SUPPORTS_WCHART && WCHAR_REP_IS_UCS2

/*static*/
std::wstring::const_iterator cStringUtil::Convert(std::wstring& wcs, const wc16_string& dbs)
{
    if (dbs.size() != 0)
    {
        if (tss_find_in_hash(dbs, wcs))
            return wcs.begin();

        wcs.resize(dbs.size());
        std::copy(dbs.begin(), dbs.end(), wcs.begin());

        tss_insert_in_hash(dbs, wcs);
    }
    else
        wcs.erase();

    return wcs.begin();
}

/*static*/
wc16_string::const_iterator cStringUtil::Convert(wc16_string& dbs, const std::wstring& wcs)
{
    if (wcs.size() != 0)
    {
        dbs.resize(wcs.size());
        std::copy(wcs.begin(), wcs.end(), dbs.begin());
    }
    else
        dbs.resize(0);

    return dbs.begin();
}

/*static*/
std::wstring::const_iterator cStringUtil::Convert(std::wstring& wcs, const std::string& nbs)
{
    if (nbs.size() != 0)
    {
        wcs.resize(nbs.size());

        size_t nWrote = ::mbstowcs((wchar_t*)wcs.c_str(), nbs.c_str(), wcs.size() + 1);
        if (nWrote == (size_t)-1)
            throw eCharacterEncoding(TSS_GetString(cCore, core::STR_ERR_BADCHAR));

        wcs.resize(nWrote);
    }
    else
        wcs.erase();

    return wcs.begin();
}

/*static*/
std::string::const_iterator cStringUtil::Convert(std::string& nbs, const std::wstring& wcs)
{
    if (wcs.size() != 0)
    {
        if (tss_find_in_hash(wc16_string(wcs.c_str()), nbs))
            return nbs.begin();

        nbs.resize(MB_CUR_MAX * wcs.size());
        size_t nWrote = ::wcstombs((char*)nbs.c_str(), wcs.c_str(), nbs.size() + 1);
        if (nWrote == (size_t)-1)
            throw eCharacterEncoding(TSS_GetString(cCore, core::STR_ERR_BADCHAR));

        nbs.resize(nWrote);

        tss_insert_in_hash(wc16_string(wcs.c_str()), nbs);
    }
    else
        nbs.erase();

    return nbs.begin();
}

#endif // SUPPORTS_WCHART && WCHAR_REP_IS_UCS2


/// TSTRING and Type Knowledge Required

///////////////////////////////////////////////////////////////////////////////
// TstrToStr
///////////////////////////////////////////////////////////////////////////////

std::string cStringUtil::TstrToStr(const TSTRING& tstr)
{
    std::string s;
    cStringUtil::Convert(s, tstr);
    return s;
}

///////////////////////////////////////////////////////////////////////////////
// StrToTstr
///////////////////////////////////////////////////////////////////////////////
TSTRING cStringUtil::StrToTstr(const std::string& rhs)
{
    TSTRING lhs;
    cStringUtil::Convert(lhs, rhs);
    return lhs;
}

///////////////////////////////////////////////////////////////////////////////
// WstrToTstr
///////////////////////////////////////////////////////////////////////////////
TSTRING cStringUtil::WstrToTstr(const wc16_string& rhs)
{
    TSTRING lhs;
    cStringUtil::Convert(lhs, rhs);
    return lhs;
}

///////////////////////////////////////////////////////////////////////////////
// TstrToWstr
///////////////////////////////////////////////////////////////////////////////
wc16_string cStringUtil::TstrToWstr(const TSTRING& rhs)
{
    wc16_string lhs;
    cStringUtil::Convert(lhs, rhs);
    return lhs;
}