/**********************************************************************

  Audacity: A Digital Audio Editor

  AudacityLogger.cpp

******************************************************************//**

\class AudacityLogger
\brief AudacityLogger is a thread-safe logger class

Provides thread-safe logging based on the wxWidgets log facility.

*//*******************************************************************/


#include "Audacity.h" // This should always be included first
#include "AudacityLogger.h"
#include "FileDialog.h"
#include "ShuttleGui.h"

#include <wx/log.h>
#include <wx/frame.h>
#include <wx/icon.h>
#include <wx/msgdlg.h>
#include <wx/settings.h>

#include "../images/AudacityLogoAlpha.xpm"

//
// AudacityLogger class
//
// Two reasons for this class instead of the wxLogWindow class (or any WX GUI logging class)
//
// 1)  If wxLogWindow is used and initialized before the Mac's "root" window, then
//     Audacity may crash when terminating.  It's not fully understood why this occurs
//     but it probably has to do with the order of deletion.  However, deferring the
//     creation of the log window until it is actually shown circumvents the problem.
// 2)  By providing an Audacity specific logging class, it can be made thread-safe and,
//     as such, can be used by the ever growing threading within Audacity.
//
enum
{
   LoggerID_Save = wxID_HIGHEST + 1,
   LoggerID_Clear,
   LoggerID_Close
};

AudacityLogger::AudacityLogger()
:  wxEvtHandler(),
   wxLog()
{
   mFrame = NULL;
   mText = NULL;
   mUpdated = false;
}

AudacityLogger::~AudacityLogger()
{
   Destroy();
}

void AudacityLogger::Flush()
{
   if (mUpdated && mFrame && mFrame->IsShown()) {
      mUpdated = false;
      mText->ChangeValue(mBuffer);
   }
}

void AudacityLogger::DoLogText(const wxString & str)
{
   if (!wxIsMainThread()) {
      wxMutexGuiEnter();
   }

   wxString stamp;

   TimeStamp(&stamp);

   if (mBuffer.IsEmpty()) {
      mBuffer << stamp << wxT("Audacity ") << AUDACITY_VERSION_STRING << wxT("\n");
   }

   mBuffer << stamp << str << wxT("\n");

   mUpdated = true;

   Flush();

   if (!wxIsMainThread()) {
      wxMutexGuiLeave();
   }
}

void AudacityLogger::Destroy()
{
   if (mFrame) {
      wxFrame *frame = mFrame;
      mFrame = NULL;
      mText = NULL;

      frame->Disconnect(LoggerID_Save,
                        wxEVT_COMMAND_BUTTON_CLICKED,
                        wxCommandEventHandler(AudacityLogger::OnSave),
                        NULL,
                        this);
      frame->Disconnect(LoggerID_Clear,
                        wxEVT_COMMAND_BUTTON_CLICKED,
                        wxCommandEventHandler(AudacityLogger::OnClear),
                        NULL,
                        this);
      frame->Disconnect(LoggerID_Close,
                        wxEVT_COMMAND_BUTTON_CLICKED,
                        wxCommandEventHandler(AudacityLogger::OnClose),
                        NULL,
                        this);

      frame->Disconnect(LoggerID_Save,
                        wxEVT_COMMAND_MENU_SELECTED,
                        wxCommandEventHandler(AudacityLogger::OnSave),
                        NULL,
                        this);
      frame->Disconnect(LoggerID_Clear,
                        wxEVT_COMMAND_MENU_SELECTED,
                        wxCommandEventHandler(AudacityLogger::OnClear),
                        NULL,
                        this);
      frame->Disconnect(LoggerID_Close,
                        wxEVT_COMMAND_MENU_SELECTED,
                        wxCommandEventHandler(AudacityLogger::OnClose),
                        NULL,
                        this);

      frame->Disconnect(wxEVT_CLOSE_WINDOW,
                        wxCloseEventHandler(AudacityLogger::OnCloseWindow),
                        NULL,
                        this);

      frame->Destroy();
   }
}

void AudacityLogger::Show(bool show)
{
   // Hide the frame if created, otherwise do nothing
   if (!show) {
      if (mFrame) {
         mFrame->Show(false);
      }
      return;
   }

   // If the frame already exists, refresh its contents and show it
   if (mFrame) {
      if (!mFrame->IsShown()) {
         mText->ChangeValue(mBuffer);
         mText->SetInsertionPointEnd();
         mText->ShowPosition(mText->GetLastPosition());
      }
      mFrame->Show();
      mFrame->Raise();
      return;
   }

   // This is the first use, so create the frame
   wxFrame *frame = new wxFrame(NULL, wxID_ANY, _("Audacity Log"));
   frame->SetName(frame->GetTitle());
   frame->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));

   // loads either the XPM or the windows resource, depending on the platform
#if !defined(__WXMAC__) && !defined(__WXX11__)
   wxIcon *ic;
   #if defined(__WXMSW__)
      ic = new wxIcon(wxICON(AudacityLogo));
   #elif defined(__WXGTK__)
      ic = new wxIcon(wxICON(AudacityLogoAlpha));
   #else
      ic = new wxIcon();
      ic.CopyFromBitmap(theTheme.Bitmap(bmpAudacityLogo48x48));
   #endif
   frame->SetIcon(*ic);
   delete ic;
#endif

   // Log text
   ShuttleGui S(frame, eIsCreating);

   S.SetStyle(wxNO_BORDER | wxTAB_TRAVERSAL);
   S.Prop(true).StartPanel();
   {
      S.StartVerticalLay(true);
      {
         S.SetStyle(wxTE_MULTILINE | wxHSCROLL | wxTE_READONLY);
         mText = S.AddTextWindow(mBuffer);

         S.AddSpace(0, 5);
         S.StartHorizontalLay(wxALIGN_CENTER, 0);
         {
            S.AddSpace(10, 0);
            S.Id(LoggerID_Save).AddButton(_("&Save..."));
            S.Id(LoggerID_Clear).AddButton(_("Cl&ear"));
            S.Id(LoggerID_Close).AddButton(_("&Close"));
            S.AddSpace(10, 0);
         }
         S.EndHorizontalLay();
         S.AddSpace(0, 3);
      }
      S.EndVerticalLay();
   }
   S.EndPanel();

   // Give a place for the menu help text to go
   // frame->CreateStatusBar();

   frame->Layout();

   // Hook into the frame events
   frame->Connect(wxEVT_CLOSE_WINDOW,
                  wxCloseEventHandler(AudacityLogger::OnCloseWindow),
                  NULL,
                  this);

   frame->Connect(LoggerID_Save,
                  wxEVT_COMMAND_MENU_SELECTED,
                  wxCommandEventHandler(AudacityLogger::OnSave),
                  NULL,
                  this);
   frame->Connect(LoggerID_Clear,
                  wxEVT_COMMAND_MENU_SELECTED,
                  wxCommandEventHandler(AudacityLogger::OnClear),
                  NULL,
                  this);
   frame->Connect(LoggerID_Close,
                  wxEVT_COMMAND_MENU_SELECTED,
                  wxCommandEventHandler(AudacityLogger::OnClose),
                  NULL,
                  this);

   frame->Connect(LoggerID_Save,
                  wxEVT_COMMAND_BUTTON_CLICKED,
                  wxCommandEventHandler(AudacityLogger::OnSave),
                  NULL,
                  this);
   frame->Connect(LoggerID_Clear,
                  wxEVT_COMMAND_BUTTON_CLICKED,
                  wxCommandEventHandler(AudacityLogger::OnClear),
                  NULL,
                  this);
   frame->Connect(LoggerID_Close,
                  wxEVT_COMMAND_BUTTON_CLICKED,
                  wxCommandEventHandler(AudacityLogger::OnClose),
                  NULL,
                  this);

   mFrame = frame;

   mFrame->Show();

   Flush();
}

#if defined(EXPERIMENTAL_CRASH_REPORT)
wxString AudacityLogger::GetLog()
{
   return mBuffer;
}
#endif

void AudacityLogger::OnCloseWindow(wxCloseEvent & WXUNUSED(e))
{
#if defined(__WXMAC__)
   // On the Mac, destroy the window rather than hiding it since the
   // log menu will override the root windows menu if there is no
   // project window open.
   Destroy();
#else
   Show(false);
#endif
}

void AudacityLogger::OnClose(wxCommandEvent & WXUNUSED(e))
{
   wxCloseEvent dummy;
   OnCloseWindow(dummy);
}

void AudacityLogger::OnClear(wxCommandEvent & WXUNUSED(e))
{
   mBuffer = wxEmptyString;
   DoLogText(wxT("Log Cleared."));
}

void AudacityLogger::OnSave(wxCommandEvent & WXUNUSED(e))
{
   wxString fName = _("log.txt");

   fName = FileSelector(_("Save log to:"),
                        wxEmptyString,
                        fName,
                        wxT("txt"),
                        wxT("*.txt"),
                        wxFD_SAVE | wxFD_OVERWRITE_PROMPT | wxRESIZE_BORDER,
                        mFrame);

   if (fName == wxEmptyString) {
      return;
   }

   if (!mText->SaveFile(fName)) {
      wxMessageBox(_("Couldn't save log to file: ") + fName,
                   _("Warning"),
                   wxICON_EXCLAMATION,
                   mFrame);
      return;
   }
}