// 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.

//
// Changes for Fluxbox made by Henrik Kinnunen (fluxgen@linuxmail.org)
//

// stupid macros needed to access some functions in version 2 of the GNU C
// library
#ifndef   _GNU_SOURCE
#define   _GNU_SOURCE
#endif // _GNU_SOURCE

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

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

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

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

#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__


// 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(
#ifdef    NLS
		     BaseDisplaySet, BaseDisplayXError,
#else // !NLS
		     0, 0,
#endif // NLS
		     "%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(
#ifdef    NLS
			     BaseDisplaySet, BaseDisplaySignalCaught,
#else // !NLS
			     0, 0,
#endif // NLS
			     "%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(
#ifdef    NLS
			       BaseDisplaySet, BaseDisplayShuttingDown,
#else // !NLS
			       0, 0,
#endif // NLS
			       "shutting down\n"));
      base_display->shutdown();
    }

    if (sig != SIGTERM && sig != SIGINT) {
      fprintf(stderr,
	      i18n->getMessage(
#ifdef    NLS
			       BaseDisplaySet, BaseDisplayAborting,
#else // !NLS
			       0, 0,
#endif // NLS
			       "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) {
	application_name = app_name;

	_startup = True;
	_shutdown = False;
	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 (! (display = XOpenDisplay(dpy_name))) {
		fprintf(stderr,
				i18n->
			getMessage(
#ifdef    NLS
				BaseDisplaySet, BaseDisplayXConnectFail,
#else // !NLS
					0, 0,
#endif // NLS
					"BaseDisplay::BaseDisplay: connection to X server failed.\n"));
		throw static_cast<int>(2); //throw error 2
  } else if (fcntl(ConnectionNumber(display), F_SETFD, 1) == -1) {
		fprintf(stderr,
			i18n->
				getMessage(
#ifdef    NLS
					BaseDisplaySet, BaseDisplayCloseOnExecFail,
#else // !NLS
					0, 0,
#endif // NLS
					"BaseDisplay::BaseDisplay: couldn't mark display connection "
					"as close-on-exec\n"));
    throw static_cast<int>(2); //throw error 2
  }

	number_of_screens = ScreenCount(display);
	display_name = XDisplayName(dpy_name);

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

	xa_wm_colormap_windows =
		XInternAtom(display, "WM_COLORMAP_WINDOWS", False);
	xa_wm_protocols = XInternAtom(display, "WM_PROTOCOLS", False);
	xa_wm_state = XInternAtom(display, "WM_STATE", False);
	xa_wm_change_state = XInternAtom(display, "WM_CHANGE_STATE", False);
	xa_wm_delete_window = XInternAtom(display, "WM_DELETE_WINDOW", False);
	xa_wm_take_focus = XInternAtom(display, "WM_TAKE_FOCUS", False);
	motif_wm_hints = XInternAtom(display, "_MOTIF_WM_HINTS", False);

	blackbox_hints = XInternAtom(display, "_BLACKBOX_HINTS", False);
	blackbox_attributes = XInternAtom(display, "_BLACKBOX_ATTRIBUTES", False);
	blackbox_change_attributes =
		XInternAtom(display, "_BLACKBOX_CHANGE_ATTRIBUTES", False);

	blackbox_structure_messages =
		XInternAtom(display, "_BLACKBOX_STRUCTURE_MESSAGES", False);
	blackbox_notify_startup =
		XInternAtom(display, "_BLACKBOX_NOTIFY_STARTUP", False);
	blackbox_notify_window_add =
		XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_ADD", False);
	blackbox_notify_window_del =
		XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_DEL", False);
	blackbox_notify_current_workspace =
		XInternAtom(display, "_BLACKBOX_NOTIFY_CURRENT_WORKSPACE", False);
	blackbox_notify_workspace_count =
		XInternAtom(display, "_BLACKBOX_NOTIFY_WORKSPACE_COUNT", False);
	blackbox_notify_window_focus =
		XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_FOCUS", False);
	blackbox_notify_window_raise =
		XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_RAISE", False);
	blackbox_notify_window_lower =
		XInternAtom(display, "_BLACKBOX_NOTIFY_WINDOW_LOWER", False);

	blackbox_change_workspace =
		XInternAtom(display, "_BLACKBOX_CHANGE_WORKSPACE", False);
	blackbox_change_window_focus =
		XInternAtom(display, "_BLACKBOX_CHANGE_WINDOW_FOCUS", False);
	blackbox_cycle_window_focus =
		XInternAtom(display, "_BLACKBOX_CYCLE_WINDOW_FOCUS", False);

#ifdef    NEWWMSPEC

	net_supported = XInternAtom(display, "_NET_SUPPORTED", False);
	net_client_list = XInternAtom(display, "_NET_CLIENT_LIST", False);
	net_client_list_stacking = XInternAtom(display, "_NET_CLIENT_LIST_STACKING", False);
	net_number_of_desktops = XInternAtom(display, "_NET_NUMBER_OF_DESKTOPS", False);
	net_desktop_geometry = XInternAtom(display, "_NET_DESKTOP_GEOMETRY", False);
	net_desktop_viewport = XInternAtom(display, "_NET_DESKTOP_VIEWPORT", False);
	net_current_desktop = XInternAtom(display, "_NET_CURRENT_DESKTOP", False);
	net_desktop_names = XInternAtom(display, "_NET_DESKTOP_NAMES", False);
	net_active_window = XInternAtom(display, "_NET_ACTIVE_WINDOW", False);
	net_workarea = XInternAtom(display, "_NET_WORKAREA", False);
	net_supporting_wm_check = XInternAtom(display, "_NET_SUPPORTING_WM_CHECK", False);
	net_virtual_roots = XInternAtom(display, "_NET_VIRTUAL_ROOTS", False);

	net_close_window = XInternAtom(display, "_NET_CLOSE_WINDOW", False);
	net_wm_moveresize = XInternAtom(display, "_NET_WM_MOVERESIZE", False);

	net_properties = XInternAtom(display, "_NET_PROPERTIES", False);
	net_wm_name = XInternAtom(display, "_NET_WM_NAME", False);
	net_wm_desktop = XInternAtom(display, "_NET_WM_DESKTOP", False);
	net_wm_window_type = XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
	net_wm_state = XInternAtom(display, "_NET_WM_STATE", False);
	net_wm_strut = XInternAtom(display, "_NET_WM_STRUT", False);
	net_wm_icon_geometry = XInternAtom(display, "_NET_WM_ICON_GEOMETRY", False);
	net_wm_icon = XInternAtom(display, "_NET_WM_ICON", False);
	net_wm_pid = XInternAtom(display, "_NET_WM_PID", False);
	net_wm_handled_icons = XInternAtom(display, "_NET_WM_HANDLED_ICONS", False);

	net_wm_ping = XInternAtom(display, "_NET_WM_PING", False);
	
#endif // NEWWMSPEC

#ifdef GNOME
	/*
	gnome_wm_win_layer = XInternAtom(display, "_WIN_LAYER", False);
	gnome_wm_win_state = XInternAtom(display, "_WIN_STATE", False);
	gnome_wm_win_hints = XInternAtom(display, "_WIN_HINTS", False);
  gnome_wm_win_app_state = XInternAtom(display, "_WIN_APP_STATE", False);
	gnome_wm_win_expanded_size = XInternAtom(display, "_WIN_EXPANDED_SIZE", False);
	gnome_wm_win_icons = XInternAtom(display, "_WIN_ICONS", False);
	gnome_wm_win_workspace = XInternAtom(display, "_WIN_WORKSPACE", False);
	gnome_wm_win_workspace_count = XInternAtom(display, "_WIN_WORKSPACE_COUNT", False);
	gnome_wm_win_workspace_names = XInternAtom(display, "_WIN_WORKSPACE_NAMES", False);
	gnome_wm_win_client_list = XInternAtom(display, "_WIN_CLIENT_LIST", False);
	gnome_wm_prot = XInternAtom(display, "_WIN_PROTOCOLS", False);
	gnome_wm_supporting_wm_check = XInternAtom(display, "_WIN_SUPPORTING_WM_CHECK", False);
	*/
#endif // GNOME

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

	XSetErrorHandler((XErrorHandler) handleXErrors);

	timerList = new LinkedList<BTimer>;

	screenInfoList = new LinkedList<ScreenInfo>;
	int i;
	for (i = 0; i < number_of_screens; i++) {
		ScreenInfo *screeninfo = new ScreenInfo(this, i);
		screenInfoList->insert(screeninfo);
	}
}


BaseDisplay::~BaseDisplay(void) {
  
	while (screenInfoList->count()) {
    ScreenInfo *si = screenInfoList->first();

	   screenInfoList->remove(si);
   	delete si;
  }
	

  delete screenInfoList;

  // we don't create the BTimers, we don't delete them
  while (timerList->count())
    timerList->remove(0);

  delete timerList;

  XCloseDisplay(display);
}

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

	int xfd = ConnectionNumber(display);

	while ((! _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(
#ifdef    NLS
						BaseDisplaySet, BaseDisplayBadWindowRemove,
#else // !NLS
						0, 0,
#endif // NLS
						"BaseDisplay::eventLoop(): removing bad window "
						"from event queue\n"));
#endif // DEBUG
			} else {
				last_bad_window = None;
				process_event(&e);
			}
		} else {
			fd_set rfds;
			timeval now, tm, *timeout = (timeval *) 0;

			FD_ZERO(&rfds);
			FD_SET(xfd, &rfds);

			if (timerList->count()) {
				gettimeofday(&now, 0);

				tm.tv_sec = tm.tv_usec = 0l;

				BTimer *timer = timerList->first();

				tm.tv_sec = timer->getStartTime().tv_sec +
					timer->getTimeout().tv_sec - now.tv_sec;
				tm.tv_usec = timer->getStartTime().tv_usec +
					timer->getTimeout().tv_usec - now.tv_usec;

				while (tm.tv_usec >= 1000000) {
					tm.tv_sec++;
					tm.tv_usec -= 1000000;
				}

				while (tm.tv_usec < 0) {
					if (tm.tv_sec > 0) {
						tm.tv_sec--;
						tm.tv_usec += 1000000;
					} else {
						tm.tv_usec = 0;
						break;
					}
				}

				timeout = &tm;
			}

			select(xfd + 1, &rfds, 0, 0, timeout);

			// check for timer timeout
			gettimeofday(&now, 0);

			LinkedListIterator<BTimer> it(timerList);
			for(; it.current(); it++) {
				tm.tv_sec = it.current()->getStartTime().tv_sec +
					it.current()->getTimeout().tv_sec;
				tm.tv_usec = it.current()->getStartTime().tv_usec +
					it.current()->getTimeout().tv_usec;

				if ((now.tv_sec < tm.tv_sec) ||
						(now.tv_sec == tm.tv_sec && now.tv_usec < tm.tv_usec))
					break;

				it.current()->fireTimeout();

				// restart the current timer so that the start time is updated
				if (! it.current()->doOnce())
					it.current()->start();
				else 
					it.current()->stop();
			}
		}
	}
}


const Bool BaseDisplay::validateWindow(Window window) {
  XEvent event;
  if (XCheckTypedWindowEvent(display, window, DestroyNotify, &event)) {
    XPutBackEvent(display, &event);

    return False;
  }

  return True;
}


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


void BaseDisplay::ungrab(void) {
  if (! --server_grabs)
    XUngrabServer(display);

  if (server_grabs < 0) server_grabs = 0;
}


void BaseDisplay::addTimer(BTimer *timer) {
  if (! timer) return;

  LinkedListIterator<BTimer> it(timerList);
  int index = 0;
  for (; it.current(); it++, index++)
    if ((it.current()->getTimeout().tv_sec > timer->getTimeout().tv_sec) ||
        ((it.current()->getTimeout().tv_sec == timer->getTimeout().tv_sec) &&
         (it.current()->getTimeout().tv_usec >= timer->getTimeout().tv_usec)))
      break;

  timerList->insert(timer, index);
}


void BaseDisplay::removeTimer(BTimer *timer) {
  timerList->remove(timer);
}


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);
  }
}