// BaseDisplay.cc for Fluxbox Window manager
// Copyright (c) 2001 - 2002 Henrik Kinnunen (fluxgen@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 1.14 2002/05/17 11:55:41 fluxgen Exp $

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

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

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

#include <X11/Xutil.h>
#include <X11/cursorfont.h>

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

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

#ifdef	HAVE_STDIO_H
#include <stdio.h>
#endif // HAVE_STDIO_H

#ifdef	STDC_HEADERS
#include <stdlib.h>
#include <string.h>
#endif // STDC_HEADERS

#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__

#ifdef DEBUG
#include <iostream>
using namespace std;
#endif
// 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;

BaseDisplay *base_display;

#ifdef DEBUG
static int handleXErrors(Display *d, XErrorEvent *e) {
	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"),
			base_display->getApplicationName(), errtxt, e->error_code,
			e->request_code, e->minor_code, e->resourceid);

#else // !DEBUG
static int handleXErrors(Display *, XErrorEvent *e) {
#endif // DEBUG

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

	if (internal_error)
		abort();

	return(False);
}


// signal handler to allow for proper and gentle shutdown

#ifndef	 HAVE_SIGACTION
static RETSIGTYPE signalhandler(int sig) {
#else //	HAVE_SIGACTION
static void signalhandler(int sig) {
#endif // HAVE_SIGACTION
	I18n *i18n = I18n::instance();
	static int re_enter = 0;

	switch (sig) {
	case SIGCHLD:
		int status;
		waitpid(-1, &status, WNOHANG | WUNTRACED);

		#ifndef HAVE_SIGACTION
		// assume broken, braindead sysv signal semantics
		signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
		#endif // HAVE_SIGACTION

		break;

	default:
		if (base_display->handleSignal(sig)) {

		#ifndef HAVE_SIGACTION
			// assume broken, braindead sysv signal semantics
			signal(sig, (RETSIGTYPE (*)(int)) signalhandler);
		#endif // HAVE_SIGACTION

			return;
		}

		fprintf(stderr,
			i18n->getMessage(
				 FBNLS::BaseDisplaySet, FBNLS::BaseDisplaySignalCaught,
				 "%s:	signal %d caught\n"),
			base_display->getApplicationName(), sig);

		if (! base_display->isStartup() && ! re_enter) {
			internal_error = True;

			re_enter = 1;
			fprintf(stderr,
				i18n->getMessage(
					FBNLS::BaseDisplaySet, FBNLS::BaseDisplayShuttingDown,
					"shutting down\n"));
			base_display->shutdown();
		}

		if (sig != SIGTERM && sig != SIGINT) {
			fprintf(stderr,
				i18n->getMessage(
				 FBNLS::BaseDisplaySet, FBNLS::BaseDisplayAborting,
				 "aborting... dumping core\n"));
			abort();
		}

		exit(0);

		break;
	}
}


// convenience functions
#ifndef		__EMX__
void bexec(const char *command, char* displaystring) {
	if (! fork()) {
		setsid();
		putenv(displaystring);
		execl("/bin/sh", "/bin/sh", "-c", command, NULL);
		exit(0);
	}
}
#endif // !__EMX__


BaseDisplay::BaseDisplay(char *app_name, char *dpy_name):FbAtoms(0),
m_startup(true), m_shutdown(false), 
m_display_name(XDisplayName(dpy_name)), m_app_name(app_name),
m_server_grabs(0)
{

	last_bad_window = None;
	I18n *i18n = I18n::instance();
	::base_display = this;

#ifdef		HAVE_SIGACTION
	struct sigaction action;

	action.sa_handler = signalhandler;
	action.sa_mask = sigset_t();
	action.sa_flags = SA_NOCLDSTOP | SA_NODEFER;

	sigaction(SIGSEGV, &action, NULL);
	sigaction(SIGFPE, &action, NULL);
	sigaction(SIGTERM, &action, NULL);
	sigaction(SIGINT, &action, NULL);
	sigaction(SIGCHLD, &action, NULL);
	sigaction(SIGHUP, &action, NULL);
	sigaction(SIGUSR1, &action, NULL);
	sigaction(SIGUSR2, &action, NULL);
#else // !HAVE_SIGACTION
	signal(SIGSEGV, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGFPE, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGTERM, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGINT, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGUSR1, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGUSR2, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGHUP, (RETSIGTYPE (*)(int)) signalhandler);
	signal(SIGCHLD, (RETSIGTYPE (*)(int)) signalhandler);
#endif // HAVE_SIGACTION

	if (! (m_display = XOpenDisplay(dpy_name))) {
		fprintf(stderr,
			i18n->
			getMessage(
				FBNLS::BaseDisplaySet, FBNLS::BaseDisplayXConnectFail,
				"BaseDisplay::BaseDisplay: connection to X server failed.\n"));
		
		throw static_cast<int>(2); //throw error 2
	} else if (fcntl(ConnectionNumber(m_display), F_SETFD, 1) == -1) {
		fprintf(stderr,
			i18n->
				getMessage(
					FBNLS::BaseDisplaySet, FBNLS::BaseDisplayCloseOnExecFail,
					"BaseDisplay::BaseDisplay: couldn't mark display connection "
					"as close-on-exec\n"));
		throw static_cast<int>(2); //throw error 2
	}
	//initiate atoms
	initAtoms(m_display);

	number_of_screens = ScreenCount(m_display);

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

	cursor.session = XCreateFontCursor(m_display, XC_left_ptr);
	cursor.move = XCreateFontCursor(m_display, XC_fleur);
	cursor.ll_angle = XCreateFontCursor(m_display, XC_ll_angle);
	cursor.lr_angle = XCreateFontCursor(m_display, XC_lr_angle);

	XSetErrorHandler((XErrorHandler) handleXErrors);

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


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

	XCloseDisplay(m_display);
}

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

	while ((! m_shutdown) && (! internal_error)) {
		if (XPending(m_display)) {
			XEvent e;
			XNextEvent(m_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;
				process_event(&e);
			}
		} else {
			BTimer::updateTimers(ConnectionNumber(m_display)); //handle all timers
		}
	}
}


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

	return true;
}


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


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





ScreenInfo::ScreenInfo(BaseDisplay *d, int num) {
	basedisplay = d;
	screen_number = num;

	root_window = RootWindow(basedisplay->getXDisplay(), screen_number);
	depth = DefaultDepth(basedisplay->getXDisplay(), screen_number);

	width =
		WidthOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(), screen_number));
	height =
		HeightOfScreen(ScreenOfDisplay(basedisplay->getXDisplay(), 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(basedisplay->getXDisplay(),
			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) {
		colormap = XCreateColormap(basedisplay->getXDisplay(), root_window,
			visual, AllocNone);
	} else {
		visual = DefaultVisual(basedisplay->getXDisplay(), screen_number);
		colormap = DefaultColormap(basedisplay->getXDisplay(), screen_number);
	}

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

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

#ifdef XINERAMA

//---------------- getHead ---------------
// 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;
}

//------------- getCurrHead --------------
// 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