// BaseDisplay.cc for Fluxbox Window manager
// Copyright (c) 2001 - 2003 Henrik Kinnunen (fluxgen(at)linuxmail.org)
//
// BaseDisplay.cc for Blackbox - an X11 Window manager
// Copyright (c) 1997 - 2000 Brad Hughes (bhughes@tcac.net)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

// $Id: BaseDisplay.cc,v 1.27 2003/04/28 00:39:34 fluxgen Exp $



#include "BaseDisplay.hh"
#include "i18n.hh"
#include "Timer.hh"

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif // HAVE_CONFIG_H

// use GNU extensions
#ifndef	 _GNU_SOURCE
#define	 _GNU_SOURCE
#endif // _GNU_SOURCE

#include <X11/Xutil.h>

#ifdef	SHAPE
#include <X11/extensions/shape.h>
#endif // SHAPE

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif // HAVE_FCNTL_H

#include <cstdio>
#include <cstdlib>
#include <cstring>

#ifdef	HAVE_UNISTD_H
#include <sys/types.h>
#include <unistd.h>
#endif // HAVE_UNISTD_H

#ifdef	HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif // HAVE_SYS_SELECT_H

#ifdef	HAVE_SIGNAL_H
#include <signal.h>
#endif // HAVE_SIGNAL_H

#ifndef	 SA_NODEFER
#ifdef	 SA_INTERRUPT
#define SA_NODEFER SA_INTERRUPT
#else // !SA_INTERRUPT
#define SA_NODEFER (0)
#endif // SA_INTERRUPT
#endif // SA_NODEFER

#ifdef HAVE_SYS_WAIT_H
#include <sys/types.h>
#include <sys/wait.h>
#endif // HAVE_SYS_WAIT_H

#if defined(HAVE_PROCESS_H) && defined(__EMX__)
#include <process.h>
#endif // HAVE_PROCESS_H  && __EMX__

#include <iostream>
using namespace std;

// X error handler to handle any and all X errors while the application is
// running
static Bool internal_error = False;
static Window last_bad_window = None;


static int handleXErrors(Display *d, XErrorEvent *e) {
#ifdef DEBUG
    char errtxt[128];
	
    XGetErrorText(d, e->error_code, errtxt, 128);
    fprintf(stderr,
            I18n::instance()->
            getMessage(
                       FBNLS::BaseDisplaySet, FBNLS::BaseDisplayXError,
                       "%s:	X error: %s(%d) opcodes %d/%d\n	resource 0x%lx\n"),
            BaseDisplay::instance()->getApplicationName(), errtxt, e->error_code,
            e->request_code, e->minor_code, e->resourceid);

#endif // !DEBUG

    if (e->error_code == BadWindow)
        last_bad_window = e->resourceid;

    if (internal_error)
        abort();

    return(False);
}



BaseDisplay *BaseDisplay::s_singleton = 0;

BaseDisplay::BaseDisplay(const char *app_name, const char *dpy_name):FbTk::App(dpy_name),
                                                                     m_startup(true), m_shutdown(false), 
                                                                     m_display_name(XDisplayName(dpy_name)), m_app_name(app_name),
                                                                     m_server_grabs(0)
{
    if (s_singleton != 0)
        throw string("Can't create more than one instance of BaseDisplay!");
	
    s_singleton = this;
	
    last_bad_window = None;
    I18n *i18n = I18n::instance();

    if (display() == 0) {
        throw string(
                     i18n->
                     getMessage(
                                FBNLS::BaseDisplaySet, FBNLS::BaseDisplayXConnectFail,
                                "BaseDisplay::BaseDisplay: connection to X server failed."));
	
    } else if (fcntl(ConnectionNumber(display()), F_SETFD, 1) == -1) {
        throw string(
                     i18n->
                     getMessage(
                                FBNLS::BaseDisplaySet, FBNLS::BaseDisplayCloseOnExecFail,
                                "BaseDisplay::BaseDisplay: couldn't mark display connection "
                                "as close-on-exec"));
		
    }
	

    number_of_screens = ScreenCount(display());

#ifdef		SHAPE
    shape.extensions = XShapeQueryExtension(display(), &shape.event_basep,
                                            &shape.error_basep);
#else // !SHAPE
    shape.extensions = False;
#endif // SHAPE

	
    XSetErrorHandler((XErrorHandler) handleXErrors);

    for (int i = 0; i < number_of_screens; i++) {
        ScreenInfo *screeninfo = new ScreenInfo(i);
        screenInfoList.push_back(screeninfo);
    }
}


BaseDisplay::~BaseDisplay() {
	
    ScreenInfoList::iterator it = screenInfoList.begin();
    ScreenInfoList::iterator it_end = screenInfoList.end();
    for (; it != it_end; ++it) {
        delete (*it);
    }
		
    s_singleton = 0;
}

BaseDisplay *BaseDisplay::instance() {
    if (s_singleton == 0)
        throw string("BaseDisplay not created!");
	
    return s_singleton;
}

void BaseDisplay::eventLoop() {
    run();

    while ((! m_shutdown) && (! internal_error)) {
        if (XPending(display())) {
            XEvent e;
            XNextEvent(display(), &e);

            if (last_bad_window != None && e.xany.window == last_bad_window) {
#ifdef DEBUG
                fprintf(stderr,
                        I18n::instance()->
                        getMessage(
                                   FBNLS::BaseDisplaySet, FBNLS::BaseDisplayBadWindowRemove,
                                   "BaseDisplay::eventLoop(): removing bad window "
                                   "from event queue\n"));
#endif // DEBUG
            } else {
                last_bad_window = None;
                handleEvent(&e);
            }
        } else {
            FbTk::Timer::updateTimers(ConnectionNumber(display())); //handle all timers
        }
    }
}


bool BaseDisplay::validateWindow(Window window) {
    XEvent event;
    if (XCheckTypedWindowEvent(display(), window, DestroyNotify, &event)) {
        XPutBackEvent(display(), &event);
        return false;
    }

    return true;
}


void BaseDisplay::grab() {
    if (! m_server_grabs++)
        XGrabServer(display());
}


void BaseDisplay::ungrab() {
    if (! --m_server_grabs)
        XUngrabServer(display());
    if (m_server_grabs < 0)
        m_server_grabs = 0;
}

ScreenInfo::ScreenInfo(int num) {
    basedisplay = BaseDisplay::instance();
    Display * const disp = basedisplay->getXDisplay();
    screen_number = num;

    root_window = RootWindow(disp, screen_number);
    depth = DefaultDepth(disp, screen_number);

    width =
        WidthOfScreen(ScreenOfDisplay(disp, screen_number));
    height =
        HeightOfScreen(ScreenOfDisplay(disp, screen_number));

    // search for a TrueColor Visual... if we can't find one... we will use the
    // default visual for the screen
    XVisualInfo vinfo_template, *vinfo_return;
    int vinfo_nitems;

    vinfo_template.screen = screen_number;
    vinfo_template.c_class = TrueColor;

    visual = (Visual *) 0;

    if ((vinfo_return = XGetVisualInfo(disp,
                                       VisualScreenMask | VisualClassMask,
                                       &vinfo_template, &vinfo_nitems)) &&
        vinfo_nitems > 0) {
			
        for (int i = 0; i < vinfo_nitems; i++) {
            if (depth < (vinfo_return + i)->depth) {
                depth = (vinfo_return + i)->depth;
                visual = (vinfo_return + i)->visual;
            }
        }

        XFree(vinfo_return);
    }

    if (visual) {
        m_colormap = XCreateColormap(disp, root_window,
                                     visual, AllocNone);
    } else {
        visual = DefaultVisual(disp, screen_number);
        m_colormap = DefaultColormap(disp, screen_number);
    }

#ifdef XINERAMA
    // check if we have Xinerama extension enabled
    if (XineramaIsActive(disp)) {
        m_hasXinerama = true;
        xineramaLastHead = 0;
        xineramaInfos =
            XineramaQueryScreens(disp, &xineramaNumHeads);
    } else {
        m_hasXinerama = false;
        xineramaInfos = 0; // make sure we don't point anywhere we shouldn't
    }
#endif // XINERAMA 
}

ScreenInfo::~ScreenInfo() {
#ifdef XINERAMA
    if (m_hasXinerama) { // only free if we first had it
        XFree(xineramaInfos);
        xineramaInfos = 0;
    }
#endif // XINERAMA
}

#ifdef XINERAMA

/**
   Searches for the head at the coordinates
   x,y. If it fails or Xinerama isn't
   activated it'll return head nr 0
*/
unsigned int ScreenInfo::getHead(int x, int y) const {

    // is Xinerama extensions enabled?
    if (hasXinerama()) {
        // check if last head is still active
        /*		if ((xineramaInfos[xineramaLastHead].x_org <= x) &&
                        ((xineramaInfos[xineramaLastHead].x_org +
                        xineramaInfos[xineramaLastHead].width) > x) &&
                        (xineramaInfos[xineramaLastHead].y_org <= y) &&
                        ((xineramaInfos[xineramaLastHead].y_org +
                        xineramaInfos[xineramaLastHead].height) > y)) {
                        return xineramaLastHead;
                        } else { */
        // go trough all the heads, and search
        for (int i = 0; (signed) i < xineramaNumHeads; i++) {
            if (xineramaInfos[i].x_org <= x &&
                (xineramaInfos[i].x_org + xineramaInfos[i].width) > x &&
                xineramaInfos[i].y_org <= y &&
                (xineramaInfos[i].y_org + xineramaInfos[i].height) > y)
                // return (xineramaLastHead = i);
                return i;
        }
        //	}
    }

    return 0;
}

/**
   Searches for the head that the pointer
   currently is on, if it isn't found
   the first one is returned
*/
unsigned int ScreenInfo::getCurrHead(void) const {

    // is Xinerama extensions enabled?
    if (hasXinerama()) {
        int x, y, wX, wY;
        unsigned int mask;
        Window rRoot, rChild;
        // get pointer cordinates
        if ( (XQueryPointer(basedisplay->getXDisplay(), root_window,
                            &rRoot, &rChild, &x, &y, &wX, &wY, &mask)) != 0 )  {			
            return getHead(x, y);
        }
    }

    return 0;
}

//----------- getHeadWidth ------------
// Returns the width of head
//-------------------------------------
unsigned int ScreenInfo::getHeadWidth(unsigned int head) const {

    if (hasXinerama()) {
        if ((signed) head >= xineramaNumHeads) {
#ifdef DEBUG
            cerr << __FILE__ << ":" <<__LINE__ << ": " <<
                "Head: " << head << " doesn't exist!" << endl;
#endif // DEBUG
            return xineramaInfos[xineramaNumHeads - 1].width;
        } else
            return xineramaInfos[head].width;
    }
	
    return getWidth();

}

//----------- getHeadHeight ------------
// Returns the heigt of head
//--------------------------------------
unsigned int ScreenInfo::getHeadHeight(unsigned int head) const {

    if (hasXinerama()) {
        if ((signed) head >= xineramaNumHeads) {
#ifdef DEBUG
            cerr << __FILE__ << ":" <<__LINE__ << ": " <<
                "Head: " << head << " doesn't exist!" << endl;
#endif // DEBUG
            return xineramaInfos[xineramaNumHeads - 1].height;
        } else
            return xineramaInfos[head].height;
    }

    return getHeight();
}


//----------- getHeadX -----------------
// Returns the X start of head nr head
//--------------------------------------
int ScreenInfo::getHeadX(unsigned int head) const {
    if (hasXinerama()) {
        if ((signed) head >= xineramaNumHeads) {
#ifdef DEBUG
            cerr << __FILE__ << ":" <<__LINE__ << ": " <<
                "Head: " << head << " doesn't exist!" << endl;
#endif // DEBUG
            return xineramaInfos[head = xineramaNumHeads - 1].x_org;
        } else 
            return xineramaInfos[head].x_org;
    }

    return 0;
}

//----------- getHeadY -----------------
// Returns the Y start of head
//--------------------------------------
int ScreenInfo::getHeadY(unsigned int head) const {
    if (hasXinerama()) {
        if ((signed) head >= xineramaNumHeads) {
#ifdef DEBUG
            cerr << __FILE__ << ":" <<__LINE__ << ": " <<
                "Head: " << head << " doesn't exist!" << endl;
#endif // DEBUG
            return xineramaInfos[xineramaNumHeads - 1].y_org;
        } else 
            return xineramaInfos[head].y_org;
    }

    return 0;
}

#endif // XINERAMA