/////////////////////////////////////////////////////////////////////////////
// Name:        src/motif/utils.cpp
// Purpose:     Various utilities
// Author:      Julian Smart
// Modified by:
// Created:     17/09/98
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

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

#include "wx/utils.h"

#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/dcmemory.h"
    #include "wx/bitmap.h"
#endif

#include "wx/apptrait.h"
#include "wx/evtloop.h"
#include "wx/private/eventloopsourcesmanager.h"
#include "wx/motif/private/timer.h"

#include <string.h>

#if (defined(__SUNCC__) || defined(__CLCC__))
    #include <sysent.h>
#endif

#ifdef __VMS__
#pragma message disable nosimpint
#endif

#include <Xm/Xm.h>
#include <Xm/Frame.h>

#include "wx/motif/private.h"

#include "X11/Xutil.h"

#ifdef __VMS__
#pragma message enable nosimpint
#endif


// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// async event processing
// ----------------------------------------------------------------------------

// Consume all events until no more left
void wxFlushEvents(WXDisplay* wxdisplay)
{
    Display *display = (Display*)wxdisplay;
    wxEventLoop evtLoop;

    XSync (display, False);

    while (evtLoop.Pending())
    {
        XFlush (display);
        evtLoop.Dispatch();
    }
}

#if wxUSE_EVENTLOOP_SOURCE

extern "C"
{

static
void
wxMotifInputHandler(XtPointer data,
                    int* WXUNUSED(fd),
                    XtInputId* WXUNUSED(inputId))
{
    wxEventLoopSourceHandler * const
        handler = static_cast<wxEventLoopSourceHandler *>(data);

    handler->OnReadWaiting();
}

}

// This class exists just to call XtRemoveInput() in its dtor, the real work of
// dispatching events on the file descriptor to the handler is done by
// wxMotifInputHandler callback above.
class wxMotifEventLoopSource : public wxEventLoopSource
{
public:
    wxMotifEventLoopSource(XtInputId inputId,
                           wxEventLoopSourceHandler *handler,
                           int flags)
        : wxEventLoopSource(handler, flags),
          m_inputId(inputId)
    {
    }

    virtual ~wxMotifEventLoopSource()
    {
        XtRemoveInput(m_inputId);
    }

private:
    const XtInputId m_inputId;

    wxDECLARE_NO_COPY_CLASS(wxMotifEventLoopSource);
};

class wxMotifEventLoopSourcesManager : public wxEventLoopSourcesManagerBase
{
public:
    wxEventLoopSource *
    AddSourceForFD(int fd, wxEventLoopSourceHandler* handler, int flags)
    {
        wxCHECK_MSG( wxTheApp, NULL, "Must create wxTheApp first" );

        // The XtInputXXXMask values cannot be combined (hence "Mask" is a
        // complete misnomer), and supporting those would make the code more
        // complicated and we don't need them for now.
        wxCHECK_MSG( !(flags & (wxEVENT_SOURCE_OUTPUT |
                                wxEVENT_SOURCE_EXCEPTION)),
                     NULL,
                     "Monitoring FDs for output/errors not supported" );

        wxCHECK_MSG( flags & wxEVENT_SOURCE_INPUT,
                     NULL,
                     "Should be monitoring for input" );

        XtInputId inputId = XtAppAddInput
                            (
                                 (XtAppContext) wxTheApp->GetAppContext(),
                                 fd,
                                 (XtPointer) XtInputReadMask,
                                 wxMotifInputHandler,
                                 handler
                            );
        if ( inputId < 0 )
            return 0;

        return new wxMotifEventLoopSource(inputId, handler, flags);
    }
};

wxEventLoopSourcesManagerBase* wxGUIAppTraits::GetEventLoopSourcesManager()
{
    static wxMotifEventLoopSourcesManager s_eventLoopSourcesManager;

    return &s_eventLoopSourcesManager;
}

#endif // wxUSE_EVENTLOOP_SOURCE

// ----------------------------------------------------------------------------
// misc
// ----------------------------------------------------------------------------

// Emit a beeeeeep
void wxBell()
{
    // Use current setting for the bell
    XBell (wxGlobalDisplay(), 0);
}

wxPortId wxGUIAppTraits::GetToolkitVersion(int *verMaj,
                                           int *verMin,
                                           int *verMicro) const
{
    // XmVERSION and XmREVISION are defined in Xm/Xm.h
    if ( verMaj )
        *verMaj = XmVERSION;
    if ( verMin )
        *verMin = XmREVISION;
    if ( verMicro )
        *verMicro = 0;

    return wxPORT_MOTIF;
}

wxEventLoopBase* wxGUIAppTraits::CreateEventLoop()
{
    return new wxEventLoop;
}

wxTimerImpl* wxGUIAppTraits::CreateTimerImpl(wxTimer* timer)
{
    return new wxMotifTimerImpl(timer);
}

// ----------------------------------------------------------------------------
// display info
// ----------------------------------------------------------------------------

void wxGetMousePosition( int* x, int* y )
{
#if wxUSE_NANOX
    // TODO
    *x = 0;
    *y = 0;
#else
    XMotionEvent xev;
    Window root, child;
    XQueryPointer(wxGlobalDisplay(),
                  DefaultRootWindow(wxGlobalDisplay()),
                  &root, &child,
                  &(xev.x_root), &(xev.y_root),
                  &(xev.x),      &(xev.y),
                  &(xev.state));
    *x = xev.x_root;
    *y = xev.y_root;
#endif
}

// Configurable display in wxX11 and wxMotif
static WXDisplay *gs_currentDisplay = NULL;
static wxString gs_displayName;

WXDisplay *wxGetDisplay()
{
    if (gs_currentDisplay)
        return gs_currentDisplay;
    else if (wxTheApp)
        return wxTheApp->GetInitialDisplay();
    return NULL;
}

bool wxSetDisplay(const wxString& display_name)
{
    gs_displayName = display_name;

    if ( display_name.empty() )
    {
        gs_currentDisplay = NULL;

        return true;
    }
    else
    {
        Cardinal argc = 0;

        Display *display = XtOpenDisplay((XtAppContext) wxTheApp->GetAppContext(),
            display_name.c_str(),
            wxTheApp->GetAppName().c_str(),
            wxTheApp->GetClassName().c_str(),
            NULL,
#if XtSpecificationRelease < 5
            0, &argc,
#else
            0, (int *)&argc,
#endif
            NULL);

        if (display)
        {
            gs_currentDisplay = (WXDisplay*) display;
            return true;
        }
        else
            return false;
    }
}

wxString wxGetDisplayName()
{
    return gs_displayName;
}

wxWindow* wxFindWindowAtPoint(const wxPoint& pt)
{
    return wxGenericFindWindowAtPoint(pt);
}

// ----------------------------------------------------------------------------
// Some colour manipulation routines
// ----------------------------------------------------------------------------

void wxHSVToXColor(wxHSV *hsv,XColor *rgb)
{
    int h = hsv->h;
    int s = hsv->s;
    int v = hsv->v;
    int r = 0, g = 0, b = 0;
    int i, f;
    int p, q, t;
    s = (s * wxMAX_RGB) / wxMAX_SV;
    v = (v * wxMAX_RGB) / wxMAX_SV;
    if (h == 360) h = 0;
    if (s == 0) { h = 0; r = g = b = v; }
    i = h / 60;
    f = h % 60;
    p = v * (wxMAX_RGB - s) / wxMAX_RGB;
    q = v * (wxMAX_RGB - s * f / 60) / wxMAX_RGB;
    t = v * (wxMAX_RGB - s * (60 - f) / 60) / wxMAX_RGB;
    switch (i)
    {
    case 0: r = v, g = t, b = p; break;
    case 1: r = q, g = v, b = p; break;
    case 2: r = p, g = v, b = t; break;
    case 3: r = p, g = q, b = v; break;
    case 4: r = t, g = p, b = v; break;
    case 5: r = v, g = p, b = q; break;
    }
    rgb->red = (unsigned short)(r << 8);
    rgb->green = (unsigned short)(g << 8);
    rgb->blue = (unsigned short)(b << 8);
}

void wxXColorToHSV(wxHSV *hsv,XColor *rgb)
{
    int r = rgb->red >> 8;
    int g = rgb->green >> 8;
    int b = rgb->blue >> 8;
    int maxv = wxMax3(r, g, b);
    int minv = wxMin3(r, g, b);
    int h = 0, s, v;
    v = maxv;
    if (maxv) s = (maxv - minv) * wxMAX_RGB / maxv;
    else s = 0;
    if (s == 0) h = 0;
    else
    {
        int rc, gc, bc, hex = 0;
        rc = (maxv - r) * wxMAX_RGB / (maxv - minv);
        gc = (maxv - g) * wxMAX_RGB / (maxv - minv);
        bc = (maxv - b) * wxMAX_RGB / (maxv - minv);
        if (r == maxv) { h = bc - gc, hex = 0; }
        else if (g == maxv) { h = rc - bc, hex = 2; }
        else if (b == maxv) { h = gc - rc, hex = 4; }
        h = hex * 60 + (h * 60 / wxMAX_RGB);
        if (h < 0) h += 360;
    }
    hsv->h = h;
    hsv->s = (s * wxMAX_SV) / wxMAX_RGB;
    hsv->v = (v * wxMAX_SV) / wxMAX_RGB;
}

void wxAllocNearestColor(Display *d,Colormap cmp,XColor *xc)
{
#if !wxUSE_NANOX
    int llp;

    int screen = DefaultScreen(d);
    int num_colors = DisplayCells(d,screen);

    XColor *color_defs = new XColor[num_colors];
    for(llp = 0;llp < num_colors;llp++) color_defs[llp].pixel = llp;
    XQueryColors(d,cmp,color_defs,num_colors);

    wxHSV hsv_defs, hsv;
    wxXColorToHSV(&hsv,xc);

    int diff, min_diff = 0, pixel = 0;

    for(llp = 0;llp < num_colors;llp++)
    {
        wxXColorToHSV(&hsv_defs,&color_defs[llp]);
        diff = wxSIGN(wxH_WEIGHT * (hsv.h - hsv_defs.h)) +
            wxSIGN(wxS_WEIGHT * (hsv.s - hsv_defs.s)) +
            wxSIGN(wxV_WEIGHT * (hsv.v - hsv_defs.v));
        if (llp == 0) min_diff = diff;
        if (min_diff > diff) { min_diff = diff; pixel = llp; }
        if (min_diff == 0) break;
    }

    xc -> red = color_defs[pixel].red;
    xc -> green = color_defs[pixel].green;
    xc -> blue = color_defs[pixel].blue;
    xc -> flags = DoRed | DoGreen | DoBlue;

/*  FIXME, TODO
    if (!XAllocColor(d,cmp,xc))
        cout << "wxAllocNearestColor : Warning : Cannot find nearest color !\n";
*/

    delete[] color_defs;
#endif
}

void wxAllocColor(Display *d,Colormap cmp,XColor *xc)
{
    if (!XAllocColor(d,cmp,xc))
    {
        //          cout << "wxAllocColor : Warning : cannot allocate color, attempt find nearest !\n";
        wxAllocNearestColor(d,cmp,xc);
    }
}

wxString wxGetXEventName(XEvent& event)
{
#if wxUSE_NANOX
    wxString str(wxT("(some event)"));
    return str;
#else
    int type = event.xany.type;
    static char* event_name[] = {
        wxMOTIF_STR(""), wxMOTIF_STR("unknown(-)"),                                         // 0-1
        wxMOTIF_STR("KeyPress"), wxMOTIF_STR("KeyRelease"), wxMOTIF_STR("ButtonPress"), wxMOTIF_STR("ButtonRelease"), // 2-5
        wxMOTIF_STR("MotionNotify"), wxMOTIF_STR("EnterNotify"), wxMOTIF_STR("LeaveNotify"), wxMOTIF_STR("FocusIn"),  // 6-9
        wxMOTIF_STR("FocusOut"), wxMOTIF_STR("KeymapNotify"), wxMOTIF_STR("Expose"), wxMOTIF_STR("GraphicsExpose"),   // 10-13
        wxMOTIF_STR("NoExpose"), wxMOTIF_STR("VisibilityNotify"), wxMOTIF_STR("CreateNotify"),           // 14-16
        wxMOTIF_STR("DestroyNotify"), wxMOTIF_STR("UnmapNotify"), wxMOTIF_STR("MapNotify"), wxMOTIF_STR("MapRequest"),// 17-20
        wxMOTIF_STR("ReparentNotify"), wxMOTIF_STR("ConfigureNotify"), wxMOTIF_STR("ConfigureRequest"),  // 21-23
        wxMOTIF_STR("GravityNotify"), wxMOTIF_STR("ResizeRequest"), wxMOTIF_STR("CirculateNotify"),      // 24-26
        wxMOTIF_STR("CirculateRequest"), wxMOTIF_STR("PropertyNotify"), wxMOTIF_STR("SelectionClear"),   // 27-29
        wxMOTIF_STR("SelectionRequest"), wxMOTIF_STR("SelectionNotify"), wxMOTIF_STR("ColormapNotify"),  // 30-32
        wxMOTIF_STR("ClientMessage"), wxMOTIF_STR("MappingNotify"),                         // 33-34
        wxMOTIF_STR("unknown(+)")};                                            // 35
    type = wxMin(35, type); type = wxMax(1, type);
    wxString str(event_name[type]);
    return str;
#endif
}

// ----------------------------------------------------------------------------
// accelerators
// ----------------------------------------------------------------------------

// Find the letter corresponding to the mnemonic, for Motif
char wxFindMnemonic (const char *s)
{
    char mnem = 0;
    int len = strlen (s);
    int i;

    for (i = 0; i < len; i++)
    {
        if (s[i] == '&')
        {
            // Carefully handle &&
            if ((i + 1) <= len && s[i + 1] == '&')
                i++;
            else
            {
                mnem = s[i + 1];
                break;
            }
        }
    }
    return mnem;
}

char* wxFindAccelerator( const char *s )
{
#if 1
    wxUnusedVar(s);
    // VZ: this function returns incorrect keysym which completely breaks kbd
    //     handling
    return NULL;
#else
    // The accelerator text is after the \t char.
    s = strchr( s, '\t' );

    if( !s ) return NULL;

    /*
    Now we need to format it as X standard:

      input            output

        F7           --> <Key>F7
        Ctrl+N       --> Ctrl<Key>N
        Alt+k        --> Meta<Key>k
        Ctrl+Shift+A --> Ctrl Shift<Key>A

        and handle Ctrl-N & similia
    */

    static char buf[256];

    buf[0] = '\0';
    wxString tmp = s + 1; // skip TAB
    size_t index = 0;

    while( index < tmp.length() )
    {
        size_t plus  = tmp.find( '+', index );
        size_t minus = tmp.find( '-', index );

        // neither '+' nor '-', add <Key>
        if( plus == wxString::npos && minus == wxString::npos )
        {
            strcat( buf, "<Key>" );
            strcat( buf, tmp.c_str() + index );

            return buf;
        }

        // OK: npos is big and positive
        size_t sep = wxMin( plus, minus );
        wxString mod = tmp.substr( index, sep - index );

        // Ctrl  -> Ctrl
        // Shift -> Shift
        // Alt   -> Meta
        if( mod == "Alt" )
            mod = "Meta";

        if( buf[0] )
            strcat( buf, " " );

        strcat( buf, mod.c_str() );

        index = sep + 1;
    }

    return NULL;
#endif
}

XmString wxFindAcceleratorText (const char *s)
{
#if 1
    wxUnusedVar(s);
    // VZ: this function returns incorrect keysym which completely breaks kbd
    //     handling
    return NULL;
#else
    // The accelerator text is after the \t char.
    s = strchr( s, '\t' );

    if( !s ) return NULL;

    return wxStringToXmString( s + 1 ); // skip TAB!
#endif
}

// Change a widget's foreground and background colours.
void wxDoChangeForegroundColour(WXWidget widget, wxColour& foregroundColour)
{
    if (!foregroundColour.IsOk())
        return;

    // When should we specify the foreground, if it's calculated
    // by wxComputeColours?
    // Solution: say we start with the default (computed) foreground colour.
    // If we call SetForegroundColour explicitly for a control or window,
    // then the foreground is changed.
    // Therefore SetBackgroundColour computes the foreground colour, and
    // SetForegroundColour changes the foreground colour. The ordering is
    // important.

    XtVaSetValues ((Widget) widget,
        XmNforeground, foregroundColour.AllocColour(XtDisplay((Widget) widget)),
        NULL);
}

void wxDoChangeBackgroundColour(WXWidget widget, const wxColour& backgroundColour, bool changeArmColour)
{
    if (!backgroundColour.IsOk())
        return;

    wxComputeColours (XtDisplay((Widget) widget), & backgroundColour,
        NULL);

    XtVaSetValues ((Widget) widget,
        XmNbackground, g_itemColors[wxBACK_INDEX].pixel,
        XmNtopShadowColor, g_itemColors[wxTOPS_INDEX].pixel,
        XmNbottomShadowColor, g_itemColors[wxBOTS_INDEX].pixel,
        XmNforeground, g_itemColors[wxFORE_INDEX].pixel,
        NULL);

    if (changeArmColour)
        XtVaSetValues ((Widget) widget,
        XmNarmColor, g_itemColors[wxSELE_INDEX].pixel,
        NULL);
}

extern void wxDoChangeFont(WXWidget widget, const wxFont& font)
{
    // Lesstif 0.87 hangs here, but 0.93 does not; MBN: sometimes it does
#if !wxCHECK_LESSTIF() // || wxCHECK_LESSTIF_VERSION( 0, 93 )
    Widget w = (Widget)widget;
    XtVaSetValues( w,
                   wxFont::GetFontTag(), font.GetFontTypeC( XtDisplay(w) ),
                   NULL );
#else
    wxUnusedVar(widget);
    wxUnusedVar(font);
#endif

}

wxString wxXmStringToString( const XmString& xmString )
{
    char *txt;
    if( XmStringGetLtoR( xmString, XmSTRING_DEFAULT_CHARSET, &txt ) )
    {
        wxString str(txt);
        XtFree (txt);
        return str;
    }

    return wxEmptyString;
}

XmString wxStringToXmString( const char* str )
{
    return XmStringCreateLtoR((char *)str, XmSTRING_DEFAULT_CHARSET);
}

// ----------------------------------------------------------------------------
// wxBitmap utility functions
// ----------------------------------------------------------------------------

// Creates a bitmap with transparent areas drawn in
// the given colour.
wxBitmap wxCreateMaskedBitmap(const wxBitmap& bitmap, const wxColour& colour)
{
    wxBitmap newBitmap(bitmap.GetWidth(),
                       bitmap.GetHeight(),
                       bitmap.GetDepth());
    wxMemoryDC destDC;
    wxMemoryDC srcDC;

    srcDC.SelectObjectAsSource(bitmap);
    destDC.SelectObject(newBitmap);

    wxBrush brush(colour, wxSOLID);
    destDC.SetBackground(brush);
    destDC.Clear();
    destDC.Blit(0, 0, bitmap.GetWidth(), bitmap.GetHeight(),
                &srcDC, 0, 0, wxCOPY, true);

    return newBitmap;
}

// ----------------------------------------------------------------------------
// Miscellaneous functions
// ----------------------------------------------------------------------------

WXWidget wxCreateBorderWidget( WXWidget parent, long style )
{
    Widget borderWidget = (Widget)NULL, parentWidget = (Widget)parent;

    if (style & wxSIMPLE_BORDER)
    {
        borderWidget = XtVaCreateManagedWidget
                                   (
                                    "simpleBorder",
                                    xmFrameWidgetClass, parentWidget,
                                    XmNshadowType, XmSHADOW_ETCHED_IN,
                                    XmNshadowThickness, 1,
                                    NULL
                                   );
    }
    else if ((style & wxSUNKEN_BORDER) || (style & wxBORDER_THEME))
    {
        borderWidget = XtVaCreateManagedWidget
                                   (
                                    "sunkenBorder",
                                    xmFrameWidgetClass, parentWidget,
                                    XmNshadowType, XmSHADOW_IN,
                                    NULL
                                   );
    }
    else if (style & wxRAISED_BORDER)
    {
        borderWidget = XtVaCreateManagedWidget
                                   (
                                    "raisedBorder",
                                    xmFrameWidgetClass, parentWidget,
                                    XmNshadowType, XmSHADOW_OUT,
                                    NULL
                                   );
    }

    return borderWidget;
}