/*! @file

    @id $Id$
*/
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#ifndef QBROWSERLIB_LOG
#define QBROWSERLIB_LOG

#ifdef QT_GUI_LIB
#include <qbrowserlib/ui_log.h>
#include <QtGui/QDialog>
#endif

#include <sstream>
#include <iostream>
#include <iomanip>
#include <typeinfo>

// supported Qt logging types
#include <QtCore/QString>
#include <QtCore/QStringList>
#include <QtCore/QUrl>
#include <QtCore/QByteArray>

namespace qbrowserlib {

#ifndef LOG
 #define LOG \
   QBROWSERLIB_LOCAL_TRACER
 // #define LOG 
 //  qbrowserlib::Log(1, __PRETTY_FUNCTION__, __FILE__, __LINE__)
 #endif

#ifndef TRC
#define TRC                                             \
  qbrowserlib::Log QBROWSERLIB_LOCAL_TRACER             \
  (this, __PRETTY_FUNCTION__, __FILE__, __LINE__)
#endif
      
#ifndef TRC_FN
#define TRC_FN                                  \
  qbrowserlib::Log QBROWSERLIB_LOCAL_TRACER     \
  (0, __PRETTY_FUNCTION__, __FILE__, __LINE__)
#endif

  class LogDialog;
      
  class Log {
      
    public:
      
      static bool DEBUG;
      
    public:
      
      Log(const void* addr, const std::string& name,
          const std::string& file, unsigned long line);
      
      template<typename TYPE> Log& operator<<(TYPE arg);
      
      ~Log() throw();
      
      static void show(QWidget* p);
      
    private:
      
      std::stringstream& init(std::stringstream& ss);
      
      std::stringstream& indent(std::stringstream& ss);
      
      std::stringstream& close(std::stringstream& ss);
      
    private:

      friend class LogDialog;
      
      static LogDialog* _dialog;
      static unsigned int _level;
      bool _debug;
      const void* _addr;
      const std::string _name;
      const std::string _file;
      unsigned long _line;
  };

  class LogDialog:
#ifdef QT_GUI_LIB
      public QDialog, public Ui::LogDialog
#else
      public QObject
#endif
  {

      Q_OBJECT;
          
    public:
          
#ifdef QT_GUI_LIB
      LogDialog(QWidget* p=0): QDialog(p) {
        setupUi(this);
      }
#endif
          
      template<typename TYPE> LogDialog& append(const Log& log, TYPE* arg) {
        std::ostringstream ss;
        ss<<"("<<typeid(TYPE*).name()<<")"<<arg;
        return append(log, ss.str());
      }
      
      template<typename TYPE> LogDialog& append(const Log& log, TYPE arg) {
#ifdef QT_GUI_LIB
        int pos(_logs->rowCount());
        _logs->insertRow(pos);
        _logs->setItem
          (pos, FILE,
           new QTableWidgetItem(QString::fromStdString(log._file)));
        _logs->setItem
          (pos, LINE, new QTableWidgetItem(QString::number(log._line)));
        if (log._addr) _logs->setItem
                         (pos, INSTANCE,
                          new QTableWidgetItem
                          (QString::number((qulonglong)log._addr)));
        _logs->setItem
          (pos, FUNCTION,
           new QTableWidgetItem(QString::fromStdString(log._name)));
        _logs->setItem
          (pos, MESSAGE,
           new QTableWidgetItem(QVariant(arg).toString()));
#endif
        return *this;
      }

    protected Q_SLOTS:

#ifdef QT_GUI_LIB
      void on__fileLine_toggled(bool checked) {
        if (checked) {
          _logs->showColumn(FILE);
          _logs->showColumn(LINE);
        } else {
          _logs->hideColumn(FILE);
          _logs->hideColumn(LINE);
        }
      }

      void on__instance_toggled(bool checked) {
        if (checked) {
          _logs->showColumn(INSTANCE);
        } else {
          _logs->hideColumn(INSTANCE);
        }
      }

      void on__function_toggled(bool checked) {
        if (checked) {
          _logs->showColumn(FUNCTION);
        } else {
          _logs->hideColumn(FUNCTION);
        }
      }

      void on__buttons_clicked(QAbstractButton* button) {
        if (_buttons->buttonRole(button)==QDialogButtonBox::ResetRole)
          for (int i(_logs->rowCount()); i>1; --i)
            _logs->removeRow(i-1);
      }

      void on__find_clicked(bool) {
        setCursor(QCursor(Qt::BusyCursor));
        QList<QTableWidgetItem*> items
          (_logs->findItems(_search->text(),
                            Qt::MatchWrap|Qt::MatchContains
                            |Qt::MatchFixedString));
        _logs->clearSelection();
        foreach (QTableWidgetItem* item, items) {
          item->setSelected(true);
        }
        if (!items.isEmpty()) _logs->scrollToItem(items[0]);
        unsetCursor();
      }
#endif
         
    private:

      friend class Log;
      enum {FILE, LINE, INSTANCE, FUNCTION, MESSAGE} Columns;
          
  };

  // note: template class method must be defined in the header
  template<typename TYPE> Log& Log::operator<<(TYPE arg) {
    if (!_debug) return *this;
    std::stringstream ss;
    init(ss);
    indent(ss)<<"   → "<<arg;
    std::clog<<close(ss).str()<<std::endl;
    if (!_dialog) _dialog = new LogDialog;
    _dialog->append(*this, arg);
    return *this;
  }
      
  template<> LogDialog& LogDialog::append
      (const Log& log, const char* arg);
  template<> LogDialog& LogDialog::append
      (const Log& log, std::string arg);
  template<> LogDialog& LogDialog::append
      (const Log& log, unsigned long arg);

  std::ostream& operator<<(std::ostream& ss, QString arg);
  std::ostream& operator<<(std::ostream& ss, QStringList arg);
  std::ostream& operator<<(std::ostream& ss, QUrl arg);
  std::ostream& operator<<(std::ostream& ss, QByteArray arg);
}

#endif