/////////////////////////////////////////////////////////////////////////////
// Name:        src/motif/app.cpp
// Purpose:     wxApp
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// RCS-ID:      $Id: app.cpp 53607 2008-05-16 15:21:40Z SN $
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#include "wx/app.h"

#ifndef WX_PRECOMP
    #include "wx/hash.h"
    #include "wx/intl.h"
    #include "wx/log.h"
    #include "wx/utils.h"
    #include "wx/memory.h"
    #include "wx/font.h"
#endif

#include "wx/evtloop.h"

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

#ifdef __VMS__
    #pragma message disable nosimpint
#endif
#include <Xm/Xm.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 bool wxAddIdleCallback();

wxHashTable *wxWidgetHashTable = NULL;

IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)

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

#ifdef __WXDEBUG__
extern "C"
{
    typedef int (*XErrorHandlerFunc)(Display *, XErrorEvent *);
}

XErrorHandlerFunc gs_pfnXErrorHandler = 0;

extern "C"
{

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& argcOrig, wxChar **argvOrig)
{
    if ( !wxAppBase::Initialize(argcOrig, argvOrig) )
        return false;

    wxWidgetHashTable = new wxHashTable(wxKEY_INTEGER);

#if wxUSE_INTL
    wxFont::SetDefaultEncoding(wxLocale::GetSystemEncoding());
#endif

    return true;
}

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

    delete wxWidgetHashTable;
    wxWidgetHashTable = NULL;

    delete m_mainLoop;

    for( wxPerDisplayDataMap::iterator it  = m_perDisplayData->begin(),
                                       end = m_perDisplayData->end();
         it != end; ++it )
    {
        delete it->second->m_visualInfo;
        // On Solaris 10 calling XtDestroyWidget on the top level widget
        // dumps core if the locale is set to something other than "C"
#ifndef __SUN__
        XtDestroyWidget( it->second->m_topLevelWidget );
#endif
        delete it->second;
    }

    delete m_perDisplayData;
}

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()
{
    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[] = {
    // better defaults for CDE under Irix
    //
    // TODO: do something similar for the other systems, the hardcoded defaults
    //       below are ugly
#ifdef __SGI__
    wxMOTIF_STR("*sgiMode: True"),
    wxMOTIF_STR("*useSchemes: all"),
#else // !__SGI__
    wxMOTIF_STR("*menuBar.marginHeight: 0"),
    wxMOTIF_STR("*menuBar.shadowThickness: 1"),
    wxMOTIF_STR("*background: #c0c0c0"),
    wxMOTIF_STR("*foreground: black"),
#endif // __SGI__/!__SGI__
    NULL
};

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

#ifdef __HPUX__
    // under HP-UX creating XmFontSet fails when the system locale is C and
    // we're using a remote DISPLAY, presumably because HP-UX uses its own
    // names for C and ISO locales (roman8 and iso8859n respectively) and so
    // its Motif libraries have troubles with non-HP X server
    //
    // whatever the reason, the fact is that without this hack any wxMotif
    // program crashes on startup because it can't create any font (HP programs
    // still work but they do spit out messages about failing to create font
    // sets and failing back on "fixed" font too)
    //
    // notice that calling setlocale() here is not enough because X(m) init
    // functions call setlocale() later so we really have to change environment
    bool fixAll = false; // tweak LC_ALL (or just LC_CTYPE)?
    const char *loc = getenv("LC_CTYPE");
    if ( !loc )
    {
        loc = getenv("LC_ALL");
        if ( loc )
            fixAll = true;
    }

    if ( !loc ||
            (loc[0] == 'C' && loc[1] == '\0') ||
                strcmp(loc, "POSIX") == 0 )
    {
        // we're using C locale, "fix" it
        wxLogDebug(_T("HP-UX fontset hack: forcing locale to en_US.iso88591"));
        putenv(fixAll ? "LC_ALL=en_US.iso88591" : "LC_CTYPE=en_US.iso88591");
    }
#endif // __HPUX__

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

    // we shouldn't pass empty application/class name as it results in
    // immediate crash inside XOpenIM() (if XIM is used) under IRIX
    wxString appname = wxTheApp->GetAppName();
    if ( appname.empty() )
        appname = _T("wxapp");
    wxString clsname = wxTheApp->GetClassName();
    if ( clsname.empty() )
        clsname = _T("wx");

    Display *dpy = XtOpenDisplay((XtAppContext) wxTheApp->m_appContext,
        (String)NULL,
        appname.c_str(),
        clsname.c_str(),
        NULL, 0,    // no options
# 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(_("wxWidgets 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 = wxMOTIF_STR("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 WXUNUSED(clientData),
                                      XtPointer WXUNUSED(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* WXUNUSED(display) )
{
    Widget rTlw = XtVaCreateWidget( "dummy_widget", topLevelShellWidgetClass,
                                    (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;

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

    s_inYield = false;

    return true;
}

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

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