/////////////////////////////////////////////////////////////////////////////
// Name:        app.cpp
// Purpose:     wxApp
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
    #pragma implementation "app.h"
#endif

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

#ifdef __VMS
#define XtParent XTPARENT
#define XtDisplay XTDISPLAY
#endif

#include "wx/app.h"
#include "wx/utils.h"
#include "wx/module.h"
#include "wx/memory.h"
#include "wx/log.h"
#include "wx/intl.h"
#include "wx/evtloop.h"
#include "wx/hash.h"

#if wxUSE_THREADS
    #include "wx/thread.h"
#endif

#ifdef __VMS__
#pragma message disable nosimpint
#endif
#include <Xm/Xm.h>
#include <Xm/Label.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
#include <X11/Xatom.h>
#ifdef __VMS__
#pragma message enable nosimpint
#endif

#include "wx/motif/private.h"

#include <string.h>

struct wxPerDisplayData
{
    wxPerDisplayData()
    {
        m_visualInfo = NULL;
        m_topLevelWidget = NULL;
        m_topLevelRealizedWidget = NULL;
    }

    wxXVisualInfo* m_visualInfo;
    Widget         m_topLevelWidget, m_topLevelRealizedWidget;
};

static void wxTLWidgetDestroyCallback(Widget w, XtPointer clientData,
                                      XtPointer ptr);
static WXWidget wxCreateTopLevelWidget( WXDisplay* display );

extern wxList wxPendingDelete;
extern bool wxAddIdleCallback();

wxHashTable *wxWidgetHashTable = NULL;

IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)

BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
    EVT_IDLE(wxAppBase::OnIdle)
END_EVENT_TABLE()

#ifdef __WXDEBUG__
    typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);

    XErrorHandlerFunc gs_pfnXErrorHandler = 0;

    static int wxXErrorHandler(Display *dpy, XErrorEvent *xevent)
    {
        // just forward to the default handler for now
        return gs_pfnXErrorHandler(dpy, xevent);
    }
#endif // __WXDEBUG__

bool wxApp::Initialize(int& argc, wxChar **argv)
{
    if ( !wxAppBase::Initialize(argc, argv) )
        return false;

    wxWidgetHashTable = new wxHashTable(wxKEY_INTEGER);

    return true;
}

void wxApp::CleanUp()
{
    delete wxWidgetHashTable;
    wxWidgetHashTable = NULL;

    wxAppBase::CleanUp();
}

void wxApp::Exit()
{
    wxApp::CleanUp();

    wxAppConsole::Exit();
}

// ============================================================================
// wxApp
// ============================================================================

wxApp::wxApp()
{
    argc = 0;
    argv = NULL;

    m_mainLoop = new wxEventLoop;
    m_mainColormap = (WXColormap) NULL;
    m_appContext = (WXAppContext) NULL;
    m_initialDisplay = (WXDisplay*) 0;
    m_perDisplayData = new wxPerDisplayDataMap;
}

wxApp::~wxApp()
{
    delete m_mainLoop;

    for( wxPerDisplayDataMap::iterator it  = m_perDisplayData->begin(),
                                       end = m_perDisplayData->end();
         it != end; ++it )
    {
        delete it->second->m_visualInfo;
        XtDestroyWidget( it->second->m_topLevelWidget );
        delete it->second;
    }

    delete m_perDisplayData;

    wxApp::SetInstance(NULL);
}

int wxApp::MainLoop()
{
    /*
    * Sit around forever waiting to process X-events. Property Change
    * event are handled special, because they have to refer to
    * the root window rather than to a widget. therefore we can't
    * use an Xt-eventhandler.
    */

    XSelectInput(XtDisplay((Widget) wxTheApp->GetTopLevelWidget()),
        XDefaultRootWindow(XtDisplay((Widget) wxTheApp->GetTopLevelWidget())),
        PropertyChangeMask);

    m_mainLoop->Run();

    return 0;
}

// This should be redefined in a derived class for
// handling property change events for XAtom IPC.
void wxApp::HandlePropertyChange(WXEvent *event)
{
    // by default do nothing special
    XtDispatchEvent((XEvent*) event); /* let Motif do the work */
}

static char *fallbackResources[] = {
    "*menuBar.marginHeight: 0",
    "*menuBar.shadowThickness: 1",
    "*background: #c0c0c0",
    "*foreground: black",
    NULL
};

// Create an application context
bool wxApp::OnInitGui()
{
    if( !wxAppBase::OnInitGui() )
        return FALSE;

    XtToolkitInitialize() ;
    wxTheApp->m_appContext = (WXAppContext) XtCreateApplicationContext();
    XtAppSetFallbackResources((XtAppContext) wxTheApp->m_appContext, fallbackResources);

    Display *dpy = XtOpenDisplay((XtAppContext) wxTheApp->m_appContext,(String)NULL,NULL,
        wxTheApp->GetClassName().c_str(), NULL, 0,
# if XtSpecificationRelease < 5
        (Cardinal*) &argc,
# else
        &argc,
# endif
        argv);

    if (!dpy) {
         // if you don't log to stderr, nothing will be shown...
        delete wxLog::SetActiveTarget(new wxLogStderr);
        wxString className(wxTheApp->GetClassName());
        wxLogError(_("wxWindows could not open display for '%s': exiting."),
                   className.c_str());
        exit(-1);
    }
    m_initialDisplay = (WXDisplay*) dpy;

#ifdef __WXDEBUG__
    // install the X error handler
    gs_pfnXErrorHandler = XSetErrorHandler(wxXErrorHandler);
#endif // __WXDEBUG__

    // Add general resize proc
    XtActionsRec rec;
    rec.string = "resize";
    rec.proc = (XtActionProc)wxWidgetResizeProc;
    XtAppAddActions((XtAppContext) wxTheApp->m_appContext, &rec, 1);

    GetMainColormap(dpy);

    wxAddIdleCallback();

    return TRUE;
}

WXColormap wxApp::GetMainColormap(WXDisplay* display)
{
    if (!display) /* Must be called first with non-NULL display */
        return m_mainColormap;

    int defaultScreen = DefaultScreen((Display*) display);
    Screen* screen = XScreenOfDisplay((Display*) display, defaultScreen);

    Colormap c = DefaultColormapOfScreen(screen);

    if (!m_mainColormap)
        m_mainColormap = (WXColormap) c;

    return (WXColormap) c;
}

static inline wxPerDisplayData& GetOrCreatePerDisplayData
    ( wxPerDisplayDataMap& m, WXDisplay* display )
{
    wxPerDisplayDataMap::iterator it = m.find( display );
    if( it != m.end() && it->second != NULL )
        return *(it->second);

    wxPerDisplayData* nData = new wxPerDisplayData();
    m[display] = nData;

    return *nData;
}

wxXVisualInfo* wxApp::GetVisualInfo( WXDisplay* display )
{
    wxPerDisplayData& data = GetOrCreatePerDisplayData( *m_perDisplayData,
                                                        display );
    if( data.m_visualInfo )
        return data.m_visualInfo;

    wxXVisualInfo* vi = new wxXVisualInfo;
    wxFillXVisualInfo( vi, (Display*)display );

    data.m_visualInfo = vi;

    return vi;
}

static void wxTLWidgetDestroyCallback(Widget w, XtPointer clientData,
                                      XtPointer ptr)
{
    if( wxTheApp )
    {
        wxTheApp->SetTopLevelWidget( (WXDisplay*)XtDisplay(w),
                                     (WXWidget)NULL );
        wxTheApp->SetTopLevelRealizedWidget( (WXDisplay*)XtDisplay(w),
                                             (WXWidget)NULL );
    }
}

WXWidget wxCreateTopLevelWidget( WXDisplay* display )
{
    Widget tlw = XtAppCreateShell( (String)NULL,
                                   wxTheApp->GetClassName().c_str(),
                                   applicationShellWidgetClass,
                                   (Display*)display,
                                   NULL, 0 );
    XtVaSetValues( tlw,
                   XmNoverrideRedirect, True,
                   NULL );

    XtAddCallback( tlw, XmNdestroyCallback,
                   (XtCallbackProc)wxTLWidgetDestroyCallback,
                   (XtPointer)NULL );

    return (WXWidget)tlw;
}

WXWidget wxCreateTopLevelRealizedWidget( WXDisplay* display )
{
    Widget rTlw = XtVaCreateWidget( "dummy_widget", xmLabelWidgetClass,
                                    (Widget)wxTheApp->GetTopLevelWidget(),
                                    NULL);
    XtSetMappedWhenManaged( rTlw, False );
    XtRealizeWidget( rTlw );

    return (WXWidget)rTlw;
}

WXWidget wxApp::GetTopLevelWidget()
{
    WXDisplay* display = wxGetDisplay();
    wxPerDisplayData& data = GetOrCreatePerDisplayData( *m_perDisplayData,
                                                        display );
    if( data.m_topLevelWidget )
        return (WXWidget)data.m_topLevelWidget;

    WXWidget tlw = wxCreateTopLevelWidget( display );
    SetTopLevelWidget( display, tlw );

    return tlw;
}

WXWidget wxApp::GetTopLevelRealizedWidget()
{
    WXDisplay* display = wxGetDisplay();
    wxPerDisplayDataMap::iterator it = m_perDisplayData->find( display );

    if( it != m_perDisplayData->end() && it->second->m_topLevelRealizedWidget )
        return (WXWidget)it->second->m_topLevelRealizedWidget;

    WXWidget rTlw = wxCreateTopLevelRealizedWidget( display );
    SetTopLevelRealizedWidget( display, rTlw );

    return rTlw;
}

void wxApp::SetTopLevelWidget(WXDisplay* display, WXWidget widget)
{
    GetOrCreatePerDisplayData( *m_perDisplayData, display )
        .m_topLevelWidget = (Widget)widget;
}

void wxApp::SetTopLevelRealizedWidget(WXDisplay* display, WXWidget widget)
{
    GetOrCreatePerDisplayData( *m_perDisplayData, display )
        .m_topLevelRealizedWidget = (Widget)widget;
}

// Yield to other processes

bool wxApp::Yield(bool onlyIfNeeded)
{
    static bool s_inYield = FALSE;

    if ( s_inYield )
    {
        if ( !onlyIfNeeded )
        {
            wxFAIL_MSG( wxT("wxYield called recursively" ) );
        }

        return FALSE;
    }

    s_inYield = TRUE;

    while (wxTheApp && wxTheApp->Pending())
        wxTheApp->Dispatch();

    s_inYield = FALSE;

    return TRUE;
}

// ----------------------------------------------------------------------------
// accessors for C modules
// ----------------------------------------------------------------------------

extern "C" XtAppContext wxGetAppContext()
{
    return (XtAppContext)wxTheApp->GetAppContext();
}