/////////////////////////////////////////////////////////////////////////////
// Name:        unix/fontutil.cpp
// Purpose:     Font helper functions for X11 (GDK/X)
// Author:      Vadim Zeitlin
// Modified by:
// Created:     05.11.99
// RCS-ID:      $Id$
// Copyright:   (c) Vadim Zeitlin
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#ifdef __GNUG__
    #pragma implementation "fontutil.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
#endif // PCH

#ifdef __X__
    #include <X11/Xlib.h>

    #include "wx/utils.h"       // for wxGetDisplay()
#elif defined(__WXGTK__)
    #include "gdk/gdk.h"
#endif

#include "wx/fontutil.h"
#include "wx/fontmap.h"
#include "wx/tokenzr.h"

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

// define the functions to create and destroy native fonts for this toolkit
#ifdef __X__
    static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
    {
        return XLoadQueryFont((Display *)wxGetDisplay(), fontSpec);
    }

    static inline void wxFreeFont(wxNativeFont font)
    {
        XFreeFont((Display *)wxGetDisplay(), (XFontStruct *)font);
    }
#elif defined(__WXGTK__)
    static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
    {
       return gdk_font_load( wxConvertWX2MB(fontSpec) );
    }

    static inline void wxFreeFont(wxNativeFont font)
    {
        gdk_font_unref(font);
    }
#else
    #error "Unknown GUI toolkit"
#endif

static bool wxTestFontSpec(const wxString& fontspec);

static wxNativeFont wxLoadQueryFont(int pointSize,
                                    int family,
                                    int style,
                                    int weight,
                                    bool underlined,
                                    const wxString& facename,
                                    const wxString& xregistry,
                                    const wxString& xencoding);

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// wxNativeEncodingInfo
// ----------------------------------------------------------------------------

// convert to/from the string representation: format is
//      registry-encoding[-facename]
bool wxNativeEncodingInfo::FromString(const wxString& s)
{
    wxStringTokenizer tokenizer(s, _T("-"));

    xregistry = tokenizer.GetNextToken();
    if ( !xregistry )
        return FALSE;

    xencoding = tokenizer.GetNextToken();
    if ( !xencoding )
        return FALSE;

    // ok even if empty
    facename = tokenizer.GetNextToken();

    return TRUE;
}

wxString wxNativeEncodingInfo::ToString() const
{
    wxString s;
    s << xregistry << _T('-') << xencoding;
    if ( !!facename )
    {
        s << _T('-') << facename;
    }

    return s;
}

// ----------------------------------------------------------------------------
// common functions
// ----------------------------------------------------------------------------

bool wxGetNativeFontEncoding(wxFontEncoding encoding,
                             wxNativeEncodingInfo *info)
{
    wxCHECK_MSG( info, FALSE, _T("bad pointer in wxGetNativeFontEncoding") );

    if ( encoding == wxFONTENCODING_DEFAULT )
    {
        encoding = wxFont::GetDefaultEncoding();
    }

    switch ( encoding )
    {
        case wxFONTENCODING_ISO8859_1:
        case wxFONTENCODING_ISO8859_2:
        case wxFONTENCODING_ISO8859_3:
        case wxFONTENCODING_ISO8859_4:
        case wxFONTENCODING_ISO8859_5:
        case wxFONTENCODING_ISO8859_6:
        case wxFONTENCODING_ISO8859_7:
        case wxFONTENCODING_ISO8859_8:
        case wxFONTENCODING_ISO8859_9:
        case wxFONTENCODING_ISO8859_10:
        case wxFONTENCODING_ISO8859_11:
        case wxFONTENCODING_ISO8859_13:
        case wxFONTENCODING_ISO8859_14:
        case wxFONTENCODING_ISO8859_15:
            {
                int cp = encoding - wxFONTENCODING_ISO8859_1 + 1;
                info->xregistry = wxT("iso8859");
                info->xencoding.Printf(wxT("%d"), cp);
            }
            break;

        case wxFONTENCODING_KOI8:
            info->xregistry = wxT("koi8");

            // we don't make distinction between koi8-r and koi8-u (so far)
            info->xencoding = wxT("*");
            break;

        case wxFONTENCODING_CP1250:
        case wxFONTENCODING_CP1251:
        case wxFONTENCODING_CP1252:
        case wxFONTENCODING_CP1253:
        case wxFONTENCODING_CP1254:
        case wxFONTENCODING_CP1255:
        case wxFONTENCODING_CP1256:
        case wxFONTENCODING_CP1257:
            {
                int cp = encoding - wxFONTENCODING_CP1250 + 1250;
                info->xregistry = wxT("microsoft");
                info->xencoding.Printf(wxT("cp%d"), cp);
            }
            break;

        case wxFONTENCODING_SYSTEM:
            info->xregistry =
            info->xencoding = wxT("*");
            break;

        default:
            // don't know how to translate this encoding into X fontspec
            return FALSE;
    }

    return TRUE;
}

bool wxTestFontEncoding(const wxNativeEncodingInfo& info)
{
    wxString fontspec;
    fontspec.Printf(_T("-*-%s-*-*-*-*-*-*-*-*-*-*-%s-%s"),
                    !info.facename ? _T("*") : info.facename.c_str(),
                    info.xregistry.c_str(),
                    info.xencoding.c_str());

    return wxTestFontSpec(fontspec);
}

// ----------------------------------------------------------------------------
// X-specific functions
// ----------------------------------------------------------------------------

wxNativeFont wxLoadQueryNearestFont(int pointSize,
                                    int family,
                                    int style,
                                    int weight,
                                    bool underlined,
                                    const wxString &facename,
                                    wxFontEncoding encoding)
{
    if ( encoding == wxFONTENCODING_DEFAULT )
    {
        encoding = wxFont::GetDefaultEncoding();
    }

    // first determine the encoding - if the font doesn't exist at all in this
    // encoding, it's useless to do all other approximations (i.e. size,
    // family &c don't matter much)
    wxNativeEncodingInfo info;
    if ( encoding == wxFONTENCODING_SYSTEM )
    {
        // This will always work so we don't test to save time
        wxGetNativeFontEncoding(wxFONTENCODING_SYSTEM, &info);
    }
    else
    {
        if ( !wxGetNativeFontEncoding(encoding, &info) ||
             !wxTestFontEncoding(info) )
        {
            if ( !wxTheFontMapper->GetAltForEncoding(encoding, &info) )
            {
                // unspported encoding - replace it with the default
                //
                // NB: we can't just return 0 from here because wxGTK code doesn't
                //     check for it (i.e. it supposes that we'll always succeed),
                //     so it would provoke a crash
                wxGetNativeFontEncoding(wxFONTENCODING_SYSTEM, &info);
            }
        }
    }
    
    // OK, we have the correct xregistry/xencoding in info structure
    wxNativeFont font = wxLoadQueryFont( pointSize, family, style, weight,
                                         underlined, facename,
                                         info.xregistry, info.xencoding );

    if ( !font )
    {
        // search up and down by stepsize 10
        int max_size = pointSize + 20 * (1 + (pointSize/180));
        int min_size = pointSize - 20 * (1 + (pointSize/180));

        int i;

        // Search for smaller size (approx.)
        for ( i = pointSize - 10; !font && i >= 10 && i >= min_size; i -= 10 )
        {
            font = wxLoadQueryFont(i, family, style, weight, underlined,
                                   facename, info.xregistry, info.xencoding);
        }

        // Search for larger size (approx.)
        for ( i = pointSize + 10; !font && i <= max_size; i += 10 )
        {
            font = wxLoadQueryFont(i, family, style, weight, underlined,
                                   facename, info.xregistry, info.xencoding);
        }

        // Try default family
        if ( !font && family != wxDEFAULT )
        {
            font = wxLoadQueryFont(pointSize, wxDEFAULT, style, weight,
                                   underlined, facename,
                                   info.xregistry, info.xencoding );
        }

        // Bogus font I
        if ( !font )
        {
            font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
                                   underlined, facename,
                                   info.xregistry, info.xencoding);
        }

        // Bogus font II
        if ( !font )
        {
            font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
                                   underlined, wxEmptyString,
                                   info.xregistry, info.xencoding);
        }
    }

    return font;
}

// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------

// returns TRUE if there are any fonts matching this font spec
static bool wxTestFontSpec(const wxString& fontspec)
{
    // some X servers will fail to load this font because there are too many
    // matches so we must test explicitly for this
    if ( fontspec == _T("-*-*-*-*-*-*-*-*-*-*-*-*-*-*") )
    {
        return TRUE;
    }

    wxNativeFont test = wxLoadFont(fontspec);
    if ( test )
    {
        wxFreeFont(test);

        return TRUE;
    }
    else
    {
        return FALSE;
    }
}

static wxNativeFont wxLoadQueryFont(int pointSize,
                                    int family,
                                    int style,
                                    int weight,
                                    bool WXUNUSED(underlined),
                                    const wxString& facename,
                                    const wxString& xregistry,
                                    const wxString& xencoding)
{
    wxString xfamily;
    switch (family)
    {
        case wxDECORATIVE: xfamily = wxT("lucida"); break;
        case wxROMAN:      xfamily = wxT("times");  break;
        case wxMODERN:     xfamily = wxT("courier"); break;
        case wxSWISS:      xfamily = wxT("helvetica"); break;
        case wxTELETYPE:   xfamily = wxT("lucidatypewriter"); break;
        case wxSCRIPT:     xfamily = wxT("utopia"); break;
        default:           xfamily = wxT("*");
    }

    wxString fontSpec;
    if (!facename.IsEmpty())
    {
        fontSpec.Printf(wxT("-*-%s-*-*-normal-*-*-*-*-*-*-*-*-*"),
                        facename.c_str());

        if ( wxTestFontSpec(fontSpec) )
        {
            xfamily = facename;
        }
        //else: no such family, use default one instead
    }

    wxString xstyle;
    switch (style)
    {
        case wxITALIC:     xstyle = wxT("i"); break;
        case wxSLANT:      xstyle = wxT("o"); break;
        case wxNORMAL:     xstyle = wxT("r"); break;
        default:           xstyle = wxT("*"); break;
    }

    wxString xweight;
    switch (weight)
    {
         case wxBOLD:
             {
                  fontSpec.Printf(wxT("-*-%s-bold-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("bold");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-heavy-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("heavy");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-extrabold-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("extrabold");
                      break;
                  }
                  fontSpec.Printf(wxT("-*-%s-demibold-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("demibold");
                      break;
                  }
                  fontSpec.Printf(wxT("-*-%s-black-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("black");
                      break;
                  }
                  fontSpec.Printf(wxT("-*-%s-ultrablack-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("ultrablack");
                      break;
                  }
              }
              break;
        case wxLIGHT:
             {
                  fontSpec.Printf(wxT("-*-%s-light-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("light");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-thin-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("thin");
                       break;
                  }
             }
             break;
         case wxNORMAL:
             {
                  fontSpec.Printf(wxT("-*-%s-medium-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("medium");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-normal-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                       xweight = wxT("normal");
                       break;
                  }
                  fontSpec.Printf(wxT("-*-%s-regular-*-*-*-*-*-*-*-*-*-*-*"),
                         xfamily.c_str());
                  if ( wxTestFontSpec(fontSpec) )
                  {
                      xweight = wxT("regular");
                      break;
                  }
                  xweight = wxT("*");
              }
              break;
        default:           xweight = wxT("*"); break;
    }

    // construct the X font spec from our data
    fontSpec.Printf(wxT("-*-%s-%s-%s-normal-*-*-%d-*-*-*-*-%s-%s"),
                    xfamily.c_str(), xweight.c_str(), xstyle.c_str(),
                    pointSize, xregistry.c_str(), xencoding.c_str());

    return wxLoadFont(fontSpec);
}