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

#ifdef __GNUG__
    #pragma implementation "app.h"
#endif

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

#include "wx/frame.h"
#include "wx/app.h"
#include "wx/utils.h"
#include "wx/gdicmn.h"
#include "wx/pen.h"
#include "wx/brush.h"
#include "wx/cursor.h"
#include "wx/icon.h"
#include "wx/palette.h"
#include "wx/dc.h"
#include "wx/dialog.h"
#include "wx/msgdlg.h"
#include "wx/log.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 <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>

extern wxList wxPendingDelete;
extern bool wxAddIdleCallback();

wxApp *wxTheApp = NULL;

wxHashTable *wxWidgetHashTable = NULL;

IMPLEMENT_DYNAMIC_CLASS(wxApp, wxEvtHandler)

BEGIN_EVENT_TABLE(wxApp, wxEvtHandler)
    EVT_IDLE(wxApp::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__

long wxApp::sm_lastMessageTime = 0;

bool wxApp::Initialize()
{
    wxClassInfo::InitializeClasses();

    // GL: I'm annoyed ... I don't know where to put this and I don't want to
    // create a module for that as it's part of the core.
#if wxUSE_THREADS
    wxPendingEventsLocker = new wxCriticalSection();
#endif

    wxTheColourDatabase = new wxColourDatabase(wxKEY_STRING);
    wxTheColourDatabase->Initialize();

    wxInitializeStockLists();
    wxInitializeStockObjects();

    wxWidgetHashTable = new wxHashTable(wxKEY_INTEGER);

    wxModule::RegisterModules();
    if (!wxModule::InitializeModules()) return FALSE;

    return TRUE;
}

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

    wxModule::CleanUpModules();

    wxDeleteStockObjects() ;

    // Destroy all GDI lists, etc.

    wxDeleteStockLists();

    delete wxTheColourDatabase;
    wxTheColourDatabase = NULL;

    wxClassInfo::CleanUpClasses();

    delete wxTheApp;
    wxTheApp = NULL;

    // GL: I'm annoyed ... I don't know where to put this and I don't want to
    // create a module for that as it's part of the core.
#if wxUSE_THREADS
    delete wxPendingEvents;
    delete wxPendingEventsLocker;
#endif

#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
    // At this point we want to check if there are any memory
    // blocks that aren't part of the wxDebugContext itself,
    // as a special case. Then when dumping we need to ignore
    // wxDebugContext, too.
    if (wxDebugContext::CountObjectsLeft(TRUE) > 0)
    {
        wxLogDebug("There were memory leaks.\n");
        wxDebugContext::Dump();
        wxDebugContext::PrintStatistics();
    }
#endif

    // do it as the very last thing because everything else can log messages
    wxLog::DontCreateOnDemand();
    // do it as the very last thing because everything else can log messages
    delete wxLog::SetActiveTarget(NULL);
}

int wxEntry( int argc, char *argv[] )
{
#if (defined(__WXDEBUG__) && wxUSE_MEMORY_TRACING) || wxUSE_DEBUG_CONTEXT
    // This seems to be necessary since there are 'rogue'
    // objects present at this point (perhaps global objects?)
    // Setting a checkpoint will ignore them as far as the
    // memory checking facility is concerned.
    // Of course you may argue that memory allocated in globals should be
    // checked, but this is a reasonable compromise.
    wxDebugContext::SetCheckpoint();
#endif

    if (!wxApp::Initialize())
        return FALSE;

    if (!wxTheApp)
    {
        if (!wxApp::GetInitializerFunction())
        {
            printf( "wxWindows error: No initializer - use IMPLEMENT_APP macro.\n" );
            return 0;
        };

        wxTheApp = (wxApp*) (* wxApp::GetInitializerFunction()) ();
    };

    if (!wxTheApp)
    {
        printf( "wxWindows error: wxTheApp == NULL\n" );
        return 0;
    };

    wxTheApp->SetClassName(wxFileNameFromPath(argv[0]));
    wxTheApp->SetAppName(wxFileNameFromPath(argv[0]));

    wxTheApp->argc = argc;
    wxTheApp->argv = argv;

    // GUI-specific initialization, such as creating an app context.
    wxTheApp->OnInitGui();

    // Here frames insert themselves automatically into wxTopLevelWindows by
    // getting created in OnInit().

    int retValue = 0;
    if (wxTheApp->OnInit())
    {
        if (wxTheApp->Initialized()) retValue = wxTheApp->OnRun();
    }

    // flush the logged messages if any
    wxLog *pLog = wxLog::GetActiveTarget();
    if ( pLog != NULL && pLog->HasPendingMessages() )
        pLog->Flush();

    // So dialog boxes aren't used for further messages
    delete wxLog::SetActiveTarget(new wxLogStderr);

    if (wxTheApp->GetTopWindow())
    {
        delete wxTheApp->GetTopWindow();
        wxTheApp->SetTopWindow(NULL);
    }

    wxTheApp->DeletePendingObjects();

    wxTheApp->OnExit();

    wxApp::CleanUp();

    return retValue;
};

// Static member initialization
wxAppInitializerFunction wxAppBase::m_appInitFn = (wxAppInitializerFunction) NULL;

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

    m_eventLoop = new wxEventLoop;
    m_mainColormap = (WXColormap) NULL;
    m_appContext = (WXAppContext) NULL;
    m_topLevelWidget = (WXWidget) NULL;
    m_maxRequestSize = 0;
    m_initialDisplay = (WXDisplay*) 0;
}

wxApp::~wxApp()
{
    delete m_eventLoop;
}

bool wxApp::Initialized()
{
    if (GetTopWindow())
        return TRUE;
    else
        return FALSE;
}

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_eventLoop->Run();

    return 0;
}

// Processes an idle event.
// Returns TRUE if more time is needed.
bool wxApp::ProcessIdle()
{
    wxIdleEvent event;

    return ProcessEvent(event) && event.MoreRequested();
}

void wxApp::ExitMainLoop()
{
    m_eventLoop->Exit();
}

// Is a message/event pending?
bool wxApp::Pending()
{
    return m_eventLoop->Pending();
#if 0
    XFlush(XtDisplay( (Widget) wxTheApp->GetTopLevelWidget() ));

    // Fix by Doug from STI, to prevent a stall if non-X event
    // is found.
    return ((XtAppPending( (XtAppContext) GetAppContext() ) & XtIMXEvent) != 0) ;
#endif
}

// Dispatch a message.
void wxApp::Dispatch()
{
    m_eventLoop->Dispatch();
}

// 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 */
}

void wxApp::OnIdle(wxIdleEvent& event)
{
    static bool inOnIdle = FALSE;

    // Avoid recursion (via ProcessEvent default case)
    if (inOnIdle)
        return;

    inOnIdle = TRUE;

    // If there are pending events, we must process them: pending events
    // are either events to the threads other than main or events posted
    // with wxPostEvent() functions
    // GRG: I have moved this here so that all pending events are processed
    //   before starting to delete any objects. This behaves better (in
    //   particular, wrt wxPostEvent) and is coherent with wxGTK's current
    //   behaviour. Also removed the '#if wxUSE_THREADS' around it.
    //  Changed Mar/2000 before 2.1.14

    // Flush pending events.
    ProcessPendingEvents();

    // 'Garbage' collection of windows deleted with Close().
    DeletePendingObjects();

    // flush the logged messages if any
    wxLog *pLog = wxLog::GetActiveTarget();
    if ( pLog != NULL && pLog->HasPendingMessages() )
        pLog->Flush();

    // Send OnIdle events to all windows
    bool needMore = SendIdleEvents();

    if (needMore)
        event.RequestMore(TRUE);

    inOnIdle = FALSE;
}

// Send idle event to all top-level windows
bool wxApp::SendIdleEvents()
{
    bool needMore = FALSE;

    wxWindowList::Node* node = wxTopLevelWindows.GetFirst();
    while (node)
    {
        wxWindow* win = node->GetData();
        if (SendIdleEvents(win))
            needMore = TRUE;
        node = node->GetNext();
    }

    return needMore;
}

// Send idle event to window and all subwindows
bool wxApp::SendIdleEvents(wxWindow* win)
{
    bool needMore = FALSE;

    wxIdleEvent event;
    event.SetEventObject(win);
    win->ProcessEvent(event);

    if (event.MoreRequested())
        needMore = TRUE;

    wxWindowList::Node* node = win->GetChildren().GetFirst();
    while (node)
    {
        wxWindow* win = node->GetData();
        if (SendIdleEvents(win))
            needMore = TRUE;

        node = node->GetNext();
    }
    return needMore ;
}

void wxApp::DeletePendingObjects()
{
    wxList::Node *node = wxPendingDelete.GetFirst();
    while (node)
    {
        wxObject *obj = node->GetData();

        delete obj;

        if (wxPendingDelete.Member(obj))
            delete node;

        // Deleting one object may have deleted other pending
        // objects, so start from beginning of list again.
        node = wxPendingDelete.GetFirst();
    }
}

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__

    wxTheApp->m_topLevelWidget =
        (WXWidget) XtAppCreateShell((String)NULL,
                                    wxTheApp->GetClassName().c_str(),
                                    applicationShellWidgetClass,dpy,
                                    NULL,0) ;

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

    GetMainColormap(dpy);
    m_maxRequestSize = XMaxRequestSize((Display*) 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;
}

void wxExit()
{
    int retValue = 0;
    if (wxTheApp)
        retValue = wxTheApp->OnExit();

    wxApp::CleanUp();
    /*
    * Exit in some platform-specific way.
    * Not recommended that the app calls this:
    * only for emergencies.
    */
    exit(retValue);
}

// Yield to other processes

bool wxApp::Yield(bool onlyIfNeeded)
{
    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();
}