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/*  -*- mode: C++; c-file-style: "gnu" -*-
    csshelper.cpp

    This file is part of KMail, the KDE mail client.
    Copyright (c) 2003 Marc Mutz <mutz@kde.org>

    KMail is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License, version 2, as
    published by the Free Software Foundation.

    KMail is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    In addition, as a special exception, the copyright holders give
    permission to link the code of this program with any edition of
    the TQt library by Trolltech AS, Norway (or with modified versions
    of TQt that use the same license as TQt), and distribute linked
    combinations including the two.  You must obey the GNU General
    Public License in all respects for all of the code used other than
    TQt.  If you modify this file, you may extend this exception to
    your version of the file, but you are not obligated to do so.  If
    you do not wish to do so, delete this exception statement from
    your version.
*/

#include "csshelper.h"

#include <kconfig.h>
#include <kglobalsettings.h>
#include <kdebug.h>
#include <kglobal.h>

#include <tqstring.h>
#include <tqapplication.h>

namespace KPIM {

  namespace {
    // some TQColor manipulators that hide the ugly TQColor API w.r.t. HSV:
    inline TQColor darker( const TQColor & c ) {
      int h, s, v;
      c.hsv( &h, &s, &v );
      return TQColor( h, s, v*4/5, TQColor::Hsv );
    }

    inline TQColor desaturate( const TQColor & c ) {
      int h, s, v;
      c.hsv( &h, &s, &v );
      return TQColor( h, s/8, v, TQColor::Hsv );
    }

    inline TQColor fixValue( const TQColor & c, int newV ) {
      int h, s, v;
      c.hsv( &h, &s, &v );
      return TQColor( h, s, newV, TQColor::Hsv );
    }

    inline int getValueOf( const TQColor & c ) {
      int h, s, v;
      c.hsv( &h, &s, &v );
      return v;
    }
  }

  CSSHelper::CSSHelper( const TQPaintDeviceMetrics &pdm ) :
    mShrinkQuotes( false ),
    mMetrics( pdm )
  {
    // initialize with defaults - should match the corresponding application defaults
    mForegroundColor = TQApplication::palette().active().text();
    mLinkColor = KGlobalSettings::linkColor();
    mVisitedLinkColor = KGlobalSettings::visitedLinkColor();
    mBackgroundColor = TQApplication::palette().active().base();
    cHtmlWarning = TQColor( 0xFF, 0x40, 0x40 ); // warning frame color: light red

    cPgpEncrH = TQColor( 0x00, 0x80, 0xFF ); // light blue
    cPgpOk1H  = TQColor( 0x40, 0xFF, 0x40 ); // light green
    cPgpOk0H  = TQColor( 0xFF, 0xFF, 0x40 ); // light yellow
    cPgpWarnH = TQColor( 0xFF, 0xFF, 0x40 ); // light yellow
    cPgpErrH  = TQt::red;

    for ( int i = 0 ; i < 3 ; ++i )
      mQuoteColor[i] = TQColor( 0x00, 0x80 - i * 0x10, 0x00 ); // shades of green
    mRecycleQuoteColors = false;

    TQFont defaultFont = KGlobalSettings::generalFont();
    TQFont defaultFixedFont = KGlobalSettings::fixedFont();
    mBodyFont = mPrintFont = defaultFont;
    mFixedFont = mFixedPrintFont = defaultFixedFont;
    defaultFont.setItalic( true );
    for ( int i = 0 ; i < 3 ; ++i )
      mQuoteFont[i] = defaultFont;

    mBackingPixmapOn = false;

    recalculatePGPColors();
  }

  void CSSHelper::recalculatePGPColors() {
    // determine the frame and body color for PGP messages from the header color
    // if the header color equals the background color then the other colors are
    // also set to the background color (-> old style PGP message viewing)
    // else
    // the brightness of the frame is set to 4/5 of the brightness of the header
    // and in case of a light background color
    // the saturation of the body is set to 1/8 of the saturation of the header
    // while in case of a dark background color
    // the value of the body is set to the value of the background color

    // Check whether the user uses a light color scheme
    const int vBG = getValueOf( mBackgroundColor );
    const bool lightBG = vBG >= 128;
    if ( cPgpOk1H == mBackgroundColor ) {
      cPgpOk1F = mBackgroundColor;
      cPgpOk1B = mBackgroundColor;
    } else {
      cPgpOk1F= darker( cPgpOk1H );
      cPgpOk1B = lightBG ? desaturate( cPgpOk1H ) : fixValue( cPgpOk1H, vBG );
    }
    if ( cPgpOk0H == mBackgroundColor ) {
      cPgpOk0F = mBackgroundColor;
      cPgpOk0B = mBackgroundColor;
    } else {
      cPgpOk0F = darker( cPgpOk0H );
      cPgpOk0B = lightBG ? desaturate( cPgpOk0H ) : fixValue( cPgpOk0H, vBG );
    }
    if ( cPgpWarnH == mBackgroundColor ) {
      cPgpWarnF = mBackgroundColor;
      cPgpWarnB = mBackgroundColor;
    } else {
      cPgpWarnF = darker( cPgpWarnH );
      cPgpWarnB = lightBG ? desaturate( cPgpWarnH ) : fixValue( cPgpWarnH, vBG );
    }
    if ( cPgpErrH == mBackgroundColor ) {
      cPgpErrF = mBackgroundColor;
      cPgpErrB = mBackgroundColor;
    } else {
      cPgpErrF = darker( cPgpErrH );
      cPgpErrB = lightBG ? desaturate( cPgpErrH ) : fixValue( cPgpErrH, vBG );
    }
    if ( cPgpEncrH == mBackgroundColor ) {
      cPgpEncrF = mBackgroundColor;
      cPgpEncrB = mBackgroundColor;
    } else {
      cPgpEncrF = darker( cPgpEncrH );
      cPgpEncrB = lightBG ? desaturate( cPgpEncrH ) : fixValue( cPgpEncrH, vBG );
    }
  }

  TQString CSSHelper::cssDefinitions( bool fixed ) const {
    return
      commonCssDefinitions()
      +
      "@media screen {\n\n"
      +
      screenCssDefinitions( this, fixed )
      +
      "}\n"
      "@media print {\n\n"
      +
      printCssDefinitions( fixed )
      +
      "}\n";
  }

  TQString CSSHelper::htmlHead( bool /*fixed*/ ) const {
    return
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\n"
      "<html><head><title></title></head>\n"
      "<body>\n";
  }

  TQString CSSHelper::quoteFontTag( int level ) const {
    if ( level < 0 )
      level = 0;
    static const int numQuoteLevels = sizeof mQuoteFont / sizeof *mQuoteFont;
    const int effectiveLevel = mRecycleQuoteColors
      ? level % numQuoteLevels + 1
      : kMin( level + 1, numQuoteLevels ) ;
    if ( level >= numQuoteLevels )
      return TQString( "<div class=\"deepquotelevel%1\">" ).arg( effectiveLevel );
    else
      return TQString( "<div class=\"quotelevel%1\">" ).arg( effectiveLevel );
  }

  TQString CSSHelper::nonQuotedFontTag() const {
    return "<div class=\"noquote\">";
  }

  TQFont CSSHelper::bodyFont( bool fixed, bool print ) const {
      return fixed ? ( print ? mFixedPrintFont : mFixedFont )
        : ( print ? mPrintFont : mBodyFont );
  }

  int CSSHelper::fontSize( bool fixed, bool print ) const {
    return bodyFont( fixed, print ).pointSize();
  }


  namespace {
    int pointsToPixel( const TQPaintDeviceMetrics & metrics, int pointSize ) {
      return ( pointSize * metrics.logicalDpiY() + 36 ) / 72 ;
    }
  }

  static const char * const quoteFontSizes[] = { "85", "80", "75" };

  TQString CSSHelper::printCssDefinitions( bool fixed ) const {
    const TQString headerFont = TQString( "  font-family: \"%1\" ! important;\n"
                                        "  font-size: %2pt ! important;\n" )
                           .arg( mPrintFont.family() )
                           .arg( mPrintFont.pointSize() );
    const TQColorGroup & cg = TQApplication::palette().active();

    const TQFont printFont = bodyFont( fixed, true /* print */ );
    TQString quoteCSS;
    if ( printFont.italic() )
      quoteCSS += "  font-style: italic ! important;\n";
    if ( printFont.bold() )
      quoteCSS += "  font-weight: bold ! important;\n";
    if ( !quoteCSS.isEmpty() )
      quoteCSS = "div.noquote {\n" + quoteCSS + "}\n\n";

    return
      TQString( "body {\n"
               "  font-family: \"%1\" ! important;\n"
               "  font-size: %2pt ! important;\n"
               "  color: #000000 ! important;\n"
               "  background-color: #ffffff ! important\n"
               "}\n\n" )
      .arg( printFont.family(),
            TQString::number( printFont.pointSize() ) )
      +
      TQString( "tr.textAtmH,\n"
               "tr.signInProgressH,\n"
               "tr.rfc822H,\n"
               "tr.encrH,\n"
               "tr.signOkKeyOkH,\n"
               "tr.signOkKeyBadH,\n"
               "tr.signWarnH,\n"
               "tr.signErrH,\n"
               "div.header {\n"
               "%1"
               "}\n\n"

               "div.fancy.header > div {\n"
               "  background-color: %2 ! important;\n"
               "  color: %3 ! important;\n"
               "  padding: 4px ! important;\n"
               "  border: solid %3 1px ! important;\n"
               "}\n\n"

               "div.fancy.header > div a[href] { color: %3 ! important; }\n\n"

               "div.fancy.header > table.outer{\n"
               "  background-color: %2 ! important;\n"
               "  color: %3 ! important;\n"
               "  border-bottom: solid %3 1px ! important;\n"
               "  border-left: solid %3 1px ! important;\n"
               "  border-right: solid %3 1px ! important;\n"
               "}\n\n"

               "div.spamheader {\n"
               "  display:none ! important;\n"
               "}\n\n"

               "div.htmlWarn {\n"
               "  border: 2px solid #ffffff ! important;\n"
               "}\n\n"

               "div.senderpic{\n"
               "  font-size:0.8em ! important;\n"
               "  border:1px solid black ! important;\n"
               "  background-color:%2 ! important;\n"
               "}\n\n"

               "div.senderstatus{\n"
               "  text-align:center ! important;\n"
               "}\n\n"

               "div.noprint {\n"
               "  display:none ! important;\n"
               "}\n\n"
            )
      .arg( headerFont,
            cg.background().name(),
            cg.foreground().name() )
      + quoteCSS;
  }

  TQString CSSHelper::screenCssDefinitions( const CSSHelper * helper, bool fixed ) const {
    const TQString fgColor = mForegroundColor.name();
    const TQString bgColor = mBackgroundColor.name();
    const TQString linkColor = mLinkColor.name();
    const TQString headerFont = TQString("  font-family: \"%1\" ! important;\n"
                                       "  font-size: %2px ! important;\n")
      .arg( mBodyFont.family() )
      .arg( pointsToPixel( helper->mMetrics, mBodyFont.pointSize() ) );
    const TQString background = ( mBackingPixmapOn
                         ? TQString( "  background-image:url(file://%1) ! important;\n" )
                           .arg( mBackingPixmapStr )
                         : TQString( "  background-color: %1 ! important;\n" )
                           .arg( bgColor ) );
    const TQString bodyFontSize = TQString::number( pointsToPixel( helper->mMetrics, fontSize( fixed ) ) ) + "px" ;
    const TQColorGroup & cg = TQApplication::palette().active();

    TQString quoteCSS;
    if ( bodyFont( fixed ).italic() )
      quoteCSS += "  font-style: italic ! important;\n";
    if ( bodyFont( fixed ).bold() )
      quoteCSS += "  font-weight: bold ! important;\n";
    if ( !quoteCSS.isEmpty() )
      quoteCSS = "div.noquote {\n" + quoteCSS + "}\n\n";

    // CSS definitions for quote levels 1-3
    for ( int i = 0 ; i < 3 ; ++i ) {
      quoteCSS += TQString( "div.quotelevel%1 {\n"
                           "  color: %2 ! important;\n" )
        .arg( TQString::number(i+1), mQuoteColor[i].name() );
      if ( mQuoteFont[i].italic() )
        quoteCSS += "  font-style: italic ! important;\n";
      if ( mQuoteFont[i].bold() )
        quoteCSS += "  font-weight: bold ! important;\n";
      if ( mShrinkQuotes )
        quoteCSS += "  font-size: " + TQString::fromLatin1( quoteFontSizes[i] )
          + "% ! important;\n";
      quoteCSS += "}\n\n";
    }

    // CSS definitions for quote levels 4+
    for ( int i = 0 ; i < 3 ; ++i ) {
      quoteCSS += TQString( "div.deepquotelevel%1 {\n"
                           "  color: %2 ! important;\n" )
        .arg( TQString::number(i+1), mQuoteColor[i].name() );
      if ( mQuoteFont[i].italic() )
        quoteCSS += "  font-style: italic ! important;\n";
      if ( mQuoteFont[i].bold() )
        quoteCSS += "  font-weight: bold ! important;\n";
      if ( mShrinkQuotes )
        quoteCSS += "  font-size: 70% ! important;\n";
      quoteCSS += "}\n\n";
    }

    return
      TQString( "body {\n"
               "  font-family: \"%1\" ! important;\n"
               "  font-size: %2 ! important;\n"
               "  color: %3 ! important;\n"
               "%4"
               "}\n\n" )
      .arg( bodyFont( fixed ).family(),
            bodyFontSize,
            fgColor,
            background )
      +
      TQString( "a {\n"
               "  color: %1 ! important;\n"
               "  text-decoration: none ! important;\n"
               "}\n\n"

               "a.white {\n"
               "  color: white ! important;\n"
               "}\n\n"

               "a.black {\n"
               "  color: black ! important;\n"
               "}\n\n"

               "table.textAtm { background-color: %2 ! important; }\n\n"

               "tr.textAtmH {\n"
               "  background-color: %3 ! important;\n"
               "%4"
               "}\n\n"

               "tr.textAtmB {\n"
               "  background-color: %3 ! important;\n"
               "}\n\n"

               "table.signInProgress,\n"
               "table.rfc822 {\n"
               "  background-color: %3 ! important;\n"
               "}\n\n"

               "tr.signInProgressH,\n"
               "tr.rfc822H {\n"
               "%4"
               "}\n\n" )
      .arg( linkColor, fgColor, bgColor, headerFont )
      +
      TQString( "table.encr {\n"
               "  background-color: %1 ! important;\n"
               "}\n\n"

               "tr.encrH {\n"
               "  background-color: %2 ! important;\n"
               "%3"
               "}\n\n"

               "tr.encrB { background-color: %4 ! important; }\n\n" )
      .arg( cPgpEncrF.name(),
            cPgpEncrH.name(),
            headerFont,
            cPgpEncrB.name() )
      +
      TQString( "table.signOkKeyOk {\n"
               "  background-color: %1 ! important;\n"
               "}\n\n"

               "tr.signOkKeyOkH {\n"
               "  background-color: %2 ! important;\n"
               "%3"
               "}\n\n"

               "tr.signOkKeyOkB { background-color: %4 ! important; }\n\n" )
      .arg( cPgpOk1F.name(),
            cPgpOk1H.name(),
            headerFont,
            cPgpOk1B.name() )
      +
      TQString( "table.signOkKeyBad {\n"
               "  background-color: %1 ! important;\n"
               "}\n\n"

               "tr.signOkKeyBadH {\n"
               "  background-color: %2 ! important;\n"
               "%3"
               "}\n\n"

               "tr.signOkKeyBadB { background-color: %4 ! important; }\n\n" )
      .arg( cPgpOk0F.name(),
            cPgpOk0H.name(),
            headerFont,
            cPgpOk0B.name() )
      +
      TQString( "table.signWarn {\n"
               "  background-color: %1 ! important;\n"
               "}\n\n"

               "tr.signWarnH {\n"
               "  background-color: %2 ! important;\n"
               "%3"
               "}\n\n"

               "tr.signWarnB { background-color: %4 ! important; }\n\n" )
      .arg( cPgpWarnF.name(),
            cPgpWarnH.name(),
            headerFont,
            cPgpWarnB.name() )
      +
      TQString( "table.signErr {\n"
               "  background-color: %1 ! important;\n"
               "}\n\n"

               "tr.signErrH {\n"
               "  background-color: %2 ! important;\n"
               "%3"
               "}\n\n"

               "tr.signErrB { background-color: %4 ! important; }\n\n" )
      .arg( cPgpErrF.name(),
            cPgpErrH.name(),
            headerFont,
            cPgpErrB.name() )
      +
      TQString( "div.htmlWarn {\n"
               "  border: 2px solid %1 ! important;\n"
               "}\n\n" )
      .arg( cHtmlWarning.name() )
      +
      TQString( "div.header {\n"
               "%1"
               "}\n\n"

               "div.fancy.header > div {\n"
               "  background-color: %2 ! important;\n"
               "  color: %3 ! important;\n"
               "  border: solid %4 1px ! important;\n"
               "}\n\n"

               "div.fancy.header > div a[href] { color: %3 ! important; }\n\n"

               "div.fancy.header > div a[href]:hover { text-decoration: underline ! important; }\n\n"

               "div.fancy.header > div.spamheader {\n"
               "  background-color: #cdcdcd ! important;\n"
               "  border-top: 0px ! important;\n"
               "  padding: 3px ! important;\n"
               "  color: black ! important;\n"
               "  font-weight: bold ! important;\n"
               "  font-size: smaller ! important;\n"
               "}\n\n"

               "div.fancy.header > table.outer {\n"
               "  background-color: %5 ! important;\n"
               "  color: %4 ! important;\n"
               "  border-bottom: solid %4 1px ! important;\n"
               "  border-left: solid %4 1px ! important;\n"
               "  border-right: solid %4 1px ! important;\n"
               "}\n\n"

               "div.senderpic{\n"
               "  padding: 0px ! important;\n"
               "  font-size:0.8em ! important;\n"
               "  border:1px solid %6 ! important;\n"
               // FIXME: InfoBackground crashes KHTML
               //"  background-color:InfoBackground ! important;\n"
               "  background-color:%5 ! important;\n"
               "}\n\n"

               "div.senderstatus{\n"
               "  text-align:center ! important;\n"
               "}\n\n"
               )

      .arg( headerFont )
      .arg( cg.highlight().name(),
            cg.highlightedText().name(),
            cg.foreground().name(),
            cg.background().name() )
      .arg( cg.mid().name() )
      + quoteCSS;
  }

  TQString CSSHelper::commonCssDefinitions() const {
    return
      "div.header {\n"
      "  margin-bottom: 10pt ! important;\n"
      "}\n\n"

      "table.textAtm {\n"
      "  margin-top: 10pt ! important;\n"
      "  margin-bottom: 10pt ! important;\n"
      "}\n\n"

      "tr.textAtmH,\n"
      "tr.textAtmB,\n"
      "tr.rfc822B {\n"
      "  font-weight: normal ! important;\n"
      "}\n\n"

      "tr.signInProgressH,\n"
      "tr.rfc822H,\n"
      "tr.encrH,\n"
      "tr.signOkKeyOkH,\n"
      "tr.signOkKeyBadH,\n"
      "tr.signWarnH,\n"
      "tr.signErrH {\n"
      "  font-weight: bold ! important;\n"
      "}\n\n"

      "tr.textAtmH td,\n"
      "tr.textAtmB td {\n"
      "  padding: 3px ! important;\n"
      "}\n\n"

      "table.rfc822 {\n"
      "  width: 100% ! important;\n"
      "  border: solid 1px black ! important;\n"
      "  margin-top: 10pt ! important;\n"
      "  margin-bottom: 10pt ! important;\n"
      "}\n\n"

      "table.textAtm,\n"
      "table.encr,\n"
      "table.signWarn,\n"
      "table.signErr,\n"
      "table.signOkKeyBad,\n"
      "table.signOkKeyOk,\n"
      "table.signInProgress,\n"
      "div.fancy.header table {\n"
      "  width: 100% ! important;\n"
      "  border-width: 0px ! important;\n"
      "}\n\n"

      "div.htmlWarn {\n"
      "  margin: 0px 5% ! important;\n"
      "  padding: 10px ! important;\n"
      "  text-align: left ! important;\n"
      "}\n\n"

      "div.fancy.header > div {\n"
      "  font-weight: bold ! important;\n"
      "  padding: 4px ! important;\n"
      "}\n\n"

      "div.fancy.header table {\n"
      "  padding: 2px ! important;\n" // ### khtml bug: this is ignored
      "  text-align: left ! important\n"
      "}\n\n"

      "div.fancy.header table th {\n"
      "  padding: 0px ! important;\n"
      "  white-space: nowrap ! important;\n"
      "  border-spacing: 0px ! important;\n"
      "  text-align: left ! important;\n"
      "  vertical-align: top ! important;\n"
      "}\n\n"

      "div.fancy.header table td {\n"
      "  padding: 0px ! important;\n"
      "  border-spacing: 0px ! important;\n"
      "  text-align: left ! important;\n"
      "  vertical-align: top ! important;\n"
      "  width: 100% ! important;\n"
      "}\n\n"

      "span.pimsmileytext {\n"
      "  position: absolute;\n"
      "  top: 0px;\n"
      "  left: 0px;\n"
      "  visibility: hidden;\n"
      "}\n\n"

      "img.pimsmileyimg {\n"
      "}\n\n"

      "div.quotelevelmark {\n"
      "  position: absolute;\n"
      "  margin-left:-10px;\n"
      "}\n\n"
      ;
  }


  void CSSHelper::setBodyFont( const TQFont& font )
  {
    mBodyFont = font;
  }

  void CSSHelper::setPrintFont( const TQFont& font )
  {
    mPrintFont = font;
  }

  TQColor CSSHelper::pgpWarnColor() const
  {
    return cPgpWarnH;
  }

} // namespace KPIM