/***********************************************************/
/*                                                         */
/*  System dependent application management (unix, x11)    */
/*                                                         */
/***********************************************************/

#include "apricot.h"
#include "unix/guts.h"
#include "Application.h"
#include "File.h"
#include <sys/utsname.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <signal.h>
#if !defined(BYTEORDER)
#error "BYTEORDER is not defined"
#endif
#define LSB32   0x1234
#define LSB64   0x12345678
#define MSB32   0x4321
#define MSB64   0x87654321
#ifndef BUFSIZ
#define BUFSIZ  2048
#endif

UnixGuts guts, *pguts = &guts;

UnixGuts *
prima_unix_guts(void)
{
	return &guts;
}

static int
x_error_handler( Display *d, XErrorEvent *ev)
{
	int tail = guts. ri_tail; 
	int prev = tail;
	char *name = "Prima";
	char buf[BUFSIZ];
	char mesg[BUFSIZ];
	char number[32];

	while ( tail != guts. ri_head) {
		if ( guts. ri[ tail]. request > ev-> serial)
			break;
		prev = tail;
		tail++;
		if ( tail >= REQUEST_RING_SIZE)
			tail = 0;
	}

	switch ( ev-> request_code) {
	case 38: /* X_QueryPointer - apc_event uses sequence of XQueryPointer calls,
					to find where the pointer belongs. The error is raised when one
					of the windows disappears . */
	case 42: /* X_SetInputFocus */
		return 0;
	}

#ifdef NEED_X11_EXTENSIONS_XRENDER_H
	if ( ev-> request_code == guts. xft_xrender_major_opcode &&
		ev-> request_code > 127 && 
		ev-> error_code == BadLength)
		/* Xrender large polygon request failed */ 
		guts. xft_disable_large_fonts = 1;
#endif

#ifdef HAVE_X11_EXTENSIONS_XCOMPOSITE_H
	if ( ev-> request_code == guts. composite_opcode &&
		ev->minor_code == X_CompositeRedirectSubwindows) {
		/* checking for composite manager */
		guts. composite_error_triggered = true;
		return 0;
	}
#endif

	XGetErrorText( d, ev-> error_code, buf, BUFSIZ);
	XGetErrorDatabaseText( d, name, "XError", "X Error", mesg, BUFSIZ);
	fprintf( stderr, "%s: %s, request: %d", mesg, buf, ev->request_code);
	if ( ev->request_code < 128) {
		sprintf( number, "%d", ev->request_code);
		XGetErrorDatabaseText( d, "XRequest", number, "", buf, BUFSIZ);
		fprintf( stderr, "(%s)", buf);
	}
	if ( tail == guts. ri_head && prev == guts. ri_head);
	else if ( tail == guts. ri_head)
		fprintf( stderr, ", after %s:%d\n",
					guts. ri[ prev]. file, guts. ri[ prev]. line);
	else
		fprintf( stderr, ", between %s:%d and %s:%d\n",
					guts. ri[ prev]. file, guts. ri[ prev]. line,
					guts. ri[ tail]. file, guts. ri[ tail]. line);
	return 0;
}

static int
x_io_error_handler( Display *d)
{
	fprintf( stderr, "Fatal input/output X error\n");
	_exit( 1);
	return 0; /* happy now? */
}

static XrmDatabase
get_database( void)
{
	XrmDatabase db = XrmGetStringDatabase( "");
	char filename[PATH_MAX];
	char *c;
	char *resource_data = XResourceManagerString( DISP);
	if ( resource_data) {
		XrmCombineDatabase( XrmGetStringDatabase( resource_data), &db, false);
	} else {
		c = getenv( "HOME");
		if (!c) c = "";
		snprintf( filename, PATH_MAX, "%s/.Xdefaults", c);
		XrmCombineFileDatabase( filename, &db, false);
	}
	return db;
}

static int
get_idepth( void)
{
	int i, n;
	XPixmapFormatValues *format = XListPixmapFormats( DISP, &n);
	int idepth = guts.depth;

	if ( !format) return guts.depth;

	for ( i = 0; i < n; i++)
		if ( format[i]. depth == guts. depth) {
			idepth = format[i]. bits_per_pixel;
			break;
		}
	XFree( format);
	return idepth;
}

static Bool  do_x11     = true;
static Bool  do_sync    = false;
static char* do_display = NULL;
static int   do_debug   = 0;
static Bool  do_icccm_only = false;
static Bool  do_no_shmem   = false;

static Bool
init_x11( char * error_buf )
{
	/*XXX*/ /* Namely, support for -display host:0.0 etc. */
	XrmQuark common_quarks_list[20];  /*XXX change number of elements if necessary */
	XrmQuarkList ql = common_quarks_list;
	XGCValues gcv;
	char *common_quarks =
		"String."
		"Blinkinvisibletime.blinkinvisibletime."
		"Blinkvisibletime.blinkvisibletime."
		"Clicktimeframe.clicktimeframe."
		"Doubleclicktimeframe.doubleclicktimeframe."
		"Wheeldown.wheeldown."
		"Wheelup.wheelup."
		"Submenudelay.submenudelay."
		"Scrollfirst.scrollfirst."
		"Scrollnext.scrollnext";

	char * atom_names[AI_count] = {
		"RESOLUTION_X",
		"RESOLUTION_Y",
		"PIXEL_SIZE",
		"SPACING",
		"RELATIVE_WEIGHT",
		"FOUNDRY",
		"AVERAGE_WIDTH",
		"CHARSET_REGISTRY",
		"CHARSET_ENCODING",
		"CREATE_EVENT",
		"WM_DELETE_WINDOW",
		"WM_PROTOCOLS",
		"WM_TAKE_FOCUS",
		"_NET_WM_STATE",
		"_NET_WM_STATE_SKIP_TASKBAR",
		"_NET_WM_STATE_MAXIMIZED_VERT",
		"_NET_WM_STATE_MAXIMIZED_HORZ",
		"_NET_WM_NAME",
		"_NET_WM_ICON_NAME",
		"UTF8_STRING",
		"TARGETS",
		"INCR",
		"PIXEL",
		"FOREGROUND",
		"BACKGROUND",
		"_MOTIF_WM_HINTS",
		"_NET_WM_STATE_MODAL",
		"_NET_SUPPORTED",
		"_NET_WM_STATE_MAXIMIZED_HORIZ",
		"text/plain;charset=UTF-8",
		"_NET_WM_STATE_STAYS_ON_TOP",
		"_NET_CURRENT_DESKTOP",
		"_NET_WORKAREA",
		"_NET_WM_STATE_ABOVE"
	};
	char hostname_buf[256], *hostname = hostname_buf;

	guts. click_time_frame = 200;
	guts. double_click_time_frame = 200;
	guts. visible_timeout = 500;
	guts. invisible_timeout = 500;
	guts. insert = true;
	guts. last_time = CurrentTime;

	guts. ri_head = guts. ri_tail = 0;
	DISP = XOpenDisplay( do_display);
	
	if (!DISP) {
		char * disp = getenv("DISPLAY");
		snprintf( error_buf, 256, "Error: Can't open display '%s'", 
					do_display ? do_display : (disp ? disp : ""));
		free( do_display);
		do_display = nil;
		return false;
	}
	free( do_display);
	do_display = nil;
	XSetErrorHandler( x_error_handler);
	guts.main_error_handler = x_error_handler;
	(void)x_io_error_handler;
	XCHECKPOINT;
	guts.connection = ConnectionNumber( DISP);

	{
		struct sockaddr name;
		unsigned int l = sizeof( name);
		guts. local_connection = getsockname( guts.connection, &name, &l) >= 0 && l == 0;
	}
	
#ifdef HAVE_X11_EXTENSIONS_SHAPE_H
	if ( XShapeQueryExtension( DISP, &guts.shape_event, &guts.shape_error)) {
		guts. shape_extension = true;
	} else {
		guts. shape_extension = false;
	}
#else
	guts. shape_extension = false;
#endif
#ifdef USE_MITSHM
	if ( !do_no_shmem && XShmQueryExtension( DISP)) {
		guts. shared_image_extension = true;
		guts. shared_image_completion_event = XShmGetEventBase( DISP) + ShmCompletion;
	} else {
		guts. shared_image_extension = false;
		guts. shared_image_completion_event = -1;
	}
#else
	guts. shared_image_extension = false;
	guts. shared_image_completion_event = -1;
#endif
	guts. randr_extension = false;
#ifdef HAVE_X11_EXTENSIONS_XRANDR_H
	{
		int dummy;
		if ( XRRQueryExtension( DISP, &dummy, &dummy))
			guts. randr_extension = true;
	}	 
#endif
#ifdef HAVE_X11_EXTENSIONS_XRENDER_H
	{
		int dummy;
		if ( XRenderQueryExtension( DISP, &dummy, &dummy))
			guts. render_extension = true;
	}	 
#endif
#ifdef HAVE_X11_EXTENSIONS_XCOMPOSITE_H
	{
		int dummy;
		if (XQueryExtension(DISP, COMPOSITE_NAME, &guts.composite_opcode, &dummy, &dummy))
			guts. composite_extension = true;
	}	 
#endif
	XrmInitialize();
	guts.db = get_database();
	XrmStringToQuarkList( common_quarks, common_quarks_list);
	guts.qString = *ql++;
	guts.qBlinkinvisibletime = *ql++;
	guts.qblinkinvisibletime = *ql++;
	guts.qBlinkvisibletime = *ql++;
	guts.qblinkvisibletime = *ql++;
	guts.qClicktimeframe = *ql++;
	guts.qclicktimeframe = *ql++;
	guts.qDoubleclicktimeframe = *ql++;
	guts.qdoubleclicktimeframe = *ql++;
	guts.qWheeldown = *ql++;
	guts.qwheeldown = *ql++;
	guts.qWheelup = *ql++;
	guts.qwheelup = *ql++;
	guts.qSubmenudelay = *ql++;
	guts.qsubmenudelay = *ql++;
	guts.qScrollfirst = *ql++;
	guts.qscrollfirst = *ql++;
	guts.qScrollnext = *ql++;
	guts.qscrollnext = *ql++;

	guts. mouse_buttons = XGetPointerMapping( DISP, guts. buttons_map, 256);
	XCHECKPOINT;

	guts. limits. request_length = XMaxRequestSize( DISP);
	guts. limits. XDrawLines = guts. limits. request_length - 3;
	guts. limits. XFillPolygon = guts. limits. request_length - 4;
	guts. limits. XDrawSegments = (guts. limits. request_length - 3) / 2;
	guts. limits. XDrawRectangles = (guts. limits. request_length - 3) / 2;
	guts. limits. XFillRectangles = (guts. limits. request_length - 3) / 2;
	guts. limits. XFillArcs =
		guts. limits. XDrawArcs = (guts. limits. request_length - 3) / 3;
	XCHECKPOINT;
	SCREEN = DefaultScreen( DISP);

	/* XXX - return code? */
	guts. root = RootWindow( DISP, SCREEN);
	guts. displaySize. x = DisplayWidth( DISP, SCREEN);
	guts. displaySize. y = DisplayHeight( DISP, SCREEN);
	XQueryBestCursor( DISP, guts. root,
							guts. displaySize. x,     /* :-) */
							guts. displaySize. y,
							&guts. cursor_width,
							&guts. cursor_height);
	XCHECKPOINT;
	
	TAILQ_INIT( &guts.paintq);
	TAILQ_INIT( &guts.peventq);
	TAILQ_INIT( &guts.bitmap_gc_pool);
	TAILQ_INIT( &guts.screen_gc_pool);
	TAILQ_INIT( &guts.argb_gc_pool);

	guts. currentFocusTime = CurrentTime;
	guts. windows = hash_create();
	guts. menu_windows = hash_create();
	guts. ximages = hash_create();
	gcv. graphics_exposures = false;
	guts. menugc = XCreateGC( DISP, guts. root, GCGraphicsExposures, &gcv);
	guts. resolution. x = 25.4 * guts. displaySize. x / DisplayWidthMM( DISP, SCREEN) + .5;
	guts. resolution. y = 25.4 * DisplayHeight( DISP, SCREEN) / DisplayHeightMM( DISP, SCREEN) + .5;
	guts. depth = DefaultDepth( DISP, SCREEN);
	guts. idepth = get_idepth();
	if ( guts.depth == 1) guts. qdepth = 1; else
	if ( guts.depth <= 4) guts. qdepth = 4; else
	if ( guts.depth <= 8) guts. qdepth = 8; else
		guts. qdepth = 24;
	guts. byte_order = ImageByteOrder( DISP);
	guts. bit_order = BitmapBitOrder( DISP);
	if ( BYTEORDER == LSB32 || BYTEORDER == LSB64)
		guts. machine_byte_order = LSBFirst;
	else if ( BYTEORDER == MSB32 || BYTEORDER == MSB64)
		guts. machine_byte_order = MSBFirst;
	else {
		sprintf( error_buf, "UAA_001: weird machine byte order: %08x", BYTEORDER);
		return false;
	}  

	XInternAtoms( DISP, atom_names, AI_count, 0, guts. atoms);

	guts. null_pointer = nilHandle;
	guts. pointer_invisible_count = 0;
	guts. files = plist_create( 16, 16);
	prima_rebuild_watchers();
	guts. wm_event_timeout = 100;
	guts. menu_timeout = 200;
	guts. scroll_first = 200;
	guts. scroll_next = 50;
	apc_timer_create( CURSOR_TIMER, nilHandle, 2);
	apc_timer_create( MENU_TIMER,   nilHandle, guts. menu_timeout);
	apc_timer_create( MENU_UNFOCUS_TIMER,   nilHandle, 50);
	if ( !prima_init_clipboard_subsystem( error_buf)) return false;
	if ( !prima_init_color_subsystem( error_buf)) return false;
	if ( !prima_init_font_subsystem( error_buf)) return false;
#ifdef WITH_GTK2
	if (!prima_gtk_init()) return false;
#endif
	bzero( &guts. cursor_gcv, sizeof( guts. cursor_gcv));
	guts. cursor_gcv. cap_style = CapButt;
	guts. cursor_gcv. function = GXcopy;

	gethostname( hostname, 256);
	hostname[255] = '\0';
	XStringListToTextProperty((char **)&hostname, 1, &guts. hostname);
	
	guts. net_wm_maximization = prima_wm_net_state_read_maximization( guts. root, NET_SUPPORTED);

	if ( do_sync) XSynchronize( DISP, true);
	return true;
}

Bool
window_subsystem_init( char * error_buf)
{
	bzero( &guts, sizeof( guts));
	guts. debug = do_debug;
	guts. icccm_only = do_icccm_only;
	Mdebug("init x11:%d, debug:%x, sync:%d, display:%s\n", do_x11, guts.debug, 
			do_sync, do_display ? do_display : "(default)");
	if ( do_x11) {
		Bool ret = init_x11( error_buf );
		if ( !ret && DISP) {
			XCloseDisplay(DISP);
			DISP = nil;
		}
		return ret;
	}
	return true;
}

int
prima_debug( const char *format, ...)
{
	int rc = 0;
	va_list args;
	va_start( args, format);
	rc = vfprintf( stderr, format, args);
	va_end( args);
	return rc;
}

Bool
window_subsystem_get_options( int * argc, char *** argv)
{
	static char * x11_argv[] = {
	"no-x11", "runs Prima without X11 display initialized",
	"display", "selects X11 DISPLAY (--display=:0.0)",
	"visual", "X visual id (--visual=0x21, run `xdpyinfo` for list of supported visuals)",
	"sync", "synchronize X connection",
	"icccm", "do not use NET_WM (kde/gnome) and MOTIF extensions, ICCCM only",
	"debug", "turns on debugging on subsystems, selected by characters (--debug=FC). "\
				"Recognized characters are: "\
				" 0(none),"\
				" C(clipboard),"\
				" E(events),"\
				" F(fonts),"\
				" M(miscellaneous),"\
				" P(palettes and colors),"\
				" X(XRDB),"\
				" A(all together)",
#ifdef USE_MITSHM
	"no-shmem",       "do not use shared memory for images",
#endif
	"no-core-fonts", "do not use core fonts",
#ifdef USE_XFT
	"no-xft",        "do not use XFT",
	"no-aa",         "do not anti-alias XFT fonts",
	"font-priority", "match unknown fonts against: 'xft' (default) or 'core'",
#endif   
	"font", 
#ifdef USE_XFT
				"default prima font in XLFD (-helv-misc-*-*-) or XFT(Helv-12) format",
#else      
				"default prima font in XLFD (-helv-misc-*-*-) format",
#endif
	"menu-font", "default menu font",
	"msg-font", "default message box font",
	"widget-font", "default widget font",
	"caption-font", "MDI caption font",
	"noscaled", "do not use scaled instances of fonts",
	"fg", "default foreground color",
	"bg", "default background color",
	"hilite-fg", "default highlight foreground color",
	"hilite-bg", "default highlight background color",
	"disabled-fg", "default disabled foreground color",
	"disabled-bg", "default disabled background color",
	"light", "default light-3d color",
	"dark", "default dark-3d color"
	};
	*argv = x11_argv;
	*argc = sizeof( x11_argv) / sizeof( char*);
	return true;
}

Bool
window_subsystem_set_option( char * option, char * value)
{
	Mdebug("%s=%s\n", option, value);
	if ( strcmp( option, "no-x11") == 0) {
		if ( value) warn("`--no-x11' option has no parameters");
		do_x11 = false;
		return true;
	} else if ( strcmp( option, "yes-x11") == 0) {
		do_x11 = true;
		return true;
	} else if ( strcmp( option, "display") == 0) {
		free( do_display);
		do_display = duplicate_string( value);
		return true;
	} else if ( strcmp( option, "icccm") == 0) {
		if ( value) warn("`--icccm' option has no parameters");
		do_icccm_only = true;
		return true;
	} else if ( strcmp( option, "no-shmem") == 0) {
		if ( value) warn("`--no-shmem' option has no parameters");
		do_no_shmem = true;
		return true;
	} else if ( strcmp( option, "debug") == 0) {
		if ( !value) {
			warn("`--debug' must be given parameters. `--debug=A` assumed\n");
			guts. debug |= DEBUG_ALL;
			do_debug = guts. debug;
			return true;
		}
		while ( *value) switch ( tolower(*(value++))) {
		case '0':
			guts. debug = 0;
			break;
		case 'c':
			guts. debug |= DEBUG_CLIP;
			break;
		case 'e':
			guts. debug |= DEBUG_EVENT;
			break;
		case 'f':
			guts. debug |= DEBUG_FONTS;
			break;
		case 'm':
			guts. debug |= DEBUG_MISC;
			break;
		case 'p':
			guts. debug |= DEBUG_COLOR;
			break;
		case 'x':
			guts. debug |= DEBUG_XRDB;
			break;
		case 'a':
			guts. debug |= DEBUG_ALL;
			break;
		}
		do_debug = guts. debug;
	} else if ( prima_font_subsystem_set_option( option, value)) {
		return true;
	} else if ( prima_color_subsystem_set_option( option, value)) {
		return true;
	}
	return false;
}

void
window_subsystem_cleanup( void)
{
	if ( !DISP) return;
	/*XXX*/
	prima_end_menu();
#ifdef WITH_GTK2
	prima_gtk_done();
#endif
}

static void
free_gc_pool( struct gc_head *head)
{
	GCList *n1, *n2;

	n1 = TAILQ_FIRST(head);
	while (n1 != nil) {
		n2 = TAILQ_NEXT(n1, gc_link);
		XFreeGC( DISP, n1-> gc);
		/* XXX */ free(n1);
		n1 = n2;
	}
	TAILQ_INIT(head);
}

void
window_subsystem_done( void)
{
	if ( !DISP) return;

	if ( guts. hostname. value) {
		XFree( guts. hostname. value);
		guts. hostname. value = nil;
	}

	prima_end_menu();

	free_gc_pool(&guts.bitmap_gc_pool);
	free_gc_pool(&guts.screen_gc_pool);
	free_gc_pool(&guts.argb_gc_pool);
	prima_done_color_subsystem();
	free( guts. clipboard_formats);

	XFreeGC( DISP, guts. menugc);
	prima_gc_ximages();          /* verrry dangerous, very quiet please */
	if ( guts.pointer_font) {
		XFreeFont( DISP, guts.pointer_font);
		guts.pointer_font = nil;
	}
	XCloseDisplay( DISP);
	DISP = nil;
	
	plist_destroy( guts. files);
	guts. files = nil;

	XrmDestroyDatabase( guts.db);
	if (guts.ximages)            hash_destroy( guts.ximages, false);
	if (guts.menu_windows)       hash_destroy( guts.menu_windows, false);
	if (guts.windows)            hash_destroy( guts.windows, false);
	if (guts.clipboards)         hash_destroy( guts.clipboards, false);
	if (guts.clipboard_xfers)    hash_destroy( guts.clipboard_xfers, false);
	prima_cleanup_font_subsystem();
}

Bool
apc_application_begin_paint( Handle self)
{
	DEFXX;
	if ( guts. appLock > 0) return false;
	prima_prepare_drawable_for_painting( self, false);
	XX-> flags. force_flush = 1;
	return true;
}

Bool
apc_application_begin_paint_info( Handle self)
{
	prima_prepare_drawable_for_painting( self, false);
	return true;
}

Bool
apc_application_create( Handle self)
{
	XSetWindowAttributes attrs;
	DEFXX;
	if ( !DISP) {
		Mdebug("apc_application_create: failed, x11 layer is not up\n");
		return false;
	}

	XX-> type.application = true;
	XX-> type.widget = true;
	XX-> type.drawable = true;

	attrs. event_mask = StructureNotifyMask | PropertyChangeMask;
	XX-> client = X_WINDOW = XCreateWindow( DISP, guts. root,
		0, 0, 1, 1, 0, CopyFromParent,
		InputOutput, CopyFromParent,
		CWEventMask, &attrs);
	XCHECKPOINT;
	if (!X_WINDOW) return false;
	hash_store( guts.windows, &X_WINDOW, sizeof(X_WINDOW), (void*)self);

	XX-> pointer_id = crArrow;
	XX-> gdrawable = XX-> udrawable = guts. root;
	XX-> parent = None;
	XX-> origin. x = 0;
	XX-> origin. y = 0;
	XX-> ackSize = XX-> size = apc_application_get_size( self);
	XX-> owner = nilHandle;
	XX-> visual = &guts. visual;

	XX-> flags. clip_owner = 1;
	XX-> flags. sync_paint = 0;

	apc_component_fullname_changed_notify( self);
	guts. mouse_wheel_down = unix_rm_get_int( self, guts.qWheeldown, guts.qwheeldown, 5);
	guts. mouse_wheel_up = unix_rm_get_int( self, guts.qWheelup, guts.qwheelup, 4);
	guts. click_time_frame = unix_rm_get_int( self, guts.qClicktimeframe, guts.qclicktimeframe, guts. click_time_frame);
	guts. double_click_time_frame = unix_rm_get_int( self, guts.qDoubleclicktimeframe, guts.qdoubleclicktimeframe, guts. double_click_time_frame);
	guts. visible_timeout = unix_rm_get_int( self, guts.qBlinkvisibletime, guts.qblinkvisibletime, guts. visible_timeout);
	guts. invisible_timeout = unix_rm_get_int( self, guts.qBlinkinvisibletime, guts.qblinkinvisibletime, guts. invisible_timeout);
	guts. menu_timeout = unix_rm_get_int( self, guts.qSubmenudelay, guts.qsubmenudelay, guts. menu_timeout);
	guts. scroll_first = unix_rm_get_int( self, guts.qScrollfirst, guts.qscrollfirst, guts. scroll_first);
	guts. scroll_next = unix_rm_get_int( self, guts.qScrollnext, guts.qscrollnext, guts. scroll_next);

	prima_send_create_event( X_WINDOW);
	return true;
}

Bool
apc_application_close( Handle self)
{
	guts. applicationClose = true;
	return true;
}

Bool
apc_application_destroy( Handle self)
{
	if ( X_WINDOW) {
		XDestroyWindow( DISP, X_WINDOW);
		XCHECKPOINT;
		hash_delete( guts.windows, (void*)&X_WINDOW, sizeof(X_WINDOW), false);
	}
	return true;
}

Bool
apc_application_end_paint( Handle self)
{
	DEFXX;
	XX-> flags. force_flush = 0;
	prima_cleanup_drawable_after_painting( self);
	return true;
}

Bool
apc_application_end_paint_info( Handle self)
{
	prima_cleanup_drawable_after_painting( self);
	return true;
}

int
apc_application_get_gui_info( char * description, int len)
{
#ifdef WITH_GTK2
	if ( description) {
		strncpy( description, "X Window System + GTK2", len);
		description[len-1] = 0;
	}
	return guiGTK2;
#else
	if ( description) {
		strncpy( description, "X Window System", len);
		description[len-1] = 0;
	}
	return guiXLib;
#endif
}

Handle
apc_application_get_widget_from_point( Handle self, Point p)
{
	XWindow from, to, child;

	from = to = guts. root;
	p. y = DisplayHeight( DISP, SCREEN) - p. y - 1;
	while (XTranslateCoordinates(DISP, from, to, p.x, p.y, &p.x, &p.y, &child)) {
		if (child) {
			from = to;
			to = child;
		} else {
			Handle h;
			if ( to == from) to = X_WINDOW;
			h = (Handle)hash_fetch( guts.windows, (void*)&to, sizeof(to));
			return ( h == application) ? nilHandle : h;
		}
	}
	return nilHandle;
}

Handle
apc_application_get_handle( Handle self, ApiHandle apiHandle)
{
	return prima_xw2h(( XWindow) apiHandle);
}

static Bool
wm_net_get_current_workarea( Rect * r)
{
	Bool ret = false;
	unsigned long n;
	unsigned long *desktop = NULL, *workarea = NULL, *w;

	if ( guts. icccm_only) return false;

	desktop = ( unsigned long *) prima_get_window_property( guts. root, 
					NET_CURRENT_DESKTOP, XA_CARDINAL, 
					NULL, NULL,
					&n);
	if ( desktop == NULL || n < 1) goto EXIT;
	Mdebug("wm: current desktop = %d\n", *desktop);
	
	workarea = ( unsigned long *) prima_get_window_property( guts. root, 
					NET_WORKAREA, XA_CARDINAL, 
					NULL, NULL,
					&n);
	if ( desktop == NULL || n < 1 || n <= *desktop ) goto EXIT;

	w = workarea + *desktop * 4; /* XYWH quartets */
	r-> left   = w[0];
	r-> top    = w[1];
	r-> right  = w[2];
	r-> bottom = w[3];
	ret = true;
	Mdebug("wm: current workarea = %d:%d:%d:%d\n", w[0], w[1], w[2], w[3]);

EXIT:
	free( workarea);
	free( desktop);
	return ret;
}

Rect
apc_application_get_indents( Handle self)
{
	Point sz;
	Rect  r;

	bzero( &r, sizeof( r));
	if ( do_icccm_only) return r;

	sz = apc_application_get_size( self);
	if ( wm_net_get_current_workarea( &r)) {
		r. right  = sz. x - r.right   - r. left;
		r. bottom = sz. y - r. bottom - r. top;
		if ( r. left   < 0) r. left   = 0;
		if ( r. top    < 0) r. top    = 0;
		if ( r. right  < 0) r. right  = 0;
		if ( r. bottom < 0) r. bottom = 0;
	}

	return r;
}

int
apc_application_get_os_info( char *system, int slen,
			char *release, int rlen,
			char *vendor, int vlen,
			char *arch, int alen)
{
	static struct utsname name;
	static Bool fetched = false;

#ifndef SYS_NMLN
#ifdef _SYS_NAMELEN
#define SYS_NMLN _SYS_NAMELEN
#else
#define SYS_NMLN 64
#endif
#endif   

	if (!fetched) {
		if ( uname(&name)!=0) {
			strncpy( name. sysname, "Some UNIX", SYS_NMLN);
			name. sysname[ SYS_NMLN-1] = 0;
			strncpy( name. release, "Unknown version of UNIX", SYS_NMLN);
			name. release[ SYS_NMLN-1] = 0;
			strncpy( name. machine, "Unknown architecture", SYS_NMLN);
			name. machine[ SYS_NMLN-1] = 0;
		}
		fetched = true;
	}

	if (system) {
		strncpy( system, name. sysname, slen);
		system[ slen-1] = 0;
	}
	if (release) {
		strncpy( release, name. release, rlen);
		release[ rlen-1] = 0;
	}
	if (vendor) {
		strncpy( vendor, "Unknown vendor", vlen);
		vendor[ vlen-1] = 0;
	}
	if (arch) {
		strncpy( arch, name. machine, alen);
		arch[ alen-1] = 0;
	}

	return apcUnix;
}

Point
apc_application_get_size( Handle self)
{
	return guts. displaySize;
}

Rect2 *
apc_application_get_monitor_rects( Handle self, int * nrects)
{
#ifdef HAVE_X11_EXTENSIONS_XRANDR_H
	XRRScreenResources * sr;
	Rect2 * ret = nil;

	if ( !guts. randr_extension) {
		*nrects = 0;
		return nil;
	}

	XCHECKPOINT;
	sr = XRRGetScreenResources(DISP,guts.root);
	if ( sr ) {
		int i;
		ret = malloc(sizeof(Rect2) * sr->ncrtc);
		*nrects = sr->ncrtc;
		for ( i = 0; i < sr->ncrtc; i++) {
			XRRCrtcInfo * ci = XRRGetCrtcInfo (DISP, sr, sr->crtcs[i]);
			ret[i].x      = ci->x;
			ret[i].y      = guts.displaySize.y - ci->height - ci->y;
			ret[i].width  = ci->width;
			ret[i].height = ci->height;
			XRRFreeCrtcInfo(ci);
		}
		XRRFreeScreenResources(sr);
		XCHECKPOINT;
	} else {
		*nrects = sr->ncrtc;
	}
	return ret;
#else   
	*nrects = 0;
	return nil;
#endif
}

typedef struct {
	int no;
	void *sub;
	void *glob;
} FileList, *PFileList;

Bool
apc_watch_filehandle( int no, void *sub, void *glob)
{
	PFileList f = malloc( sizeof( FileList));
	if ( !f) return false;
	f->no = no;
	f->sub = sub;
	f->glob = glob;
	list_add( guts.files, (Handle)f);
	return true;
}

#ifdef PerlIO
typedef PerlIO *FileStream;
#else
#define PERLIO_IS_STDIO 1
typedef FILE *FileStream;
#define PerlIO_fileno(f) fileno(f)
#endif

static Bool
purge_invalid_watchers( Handle self, void *dummy)
{
	((PFile)self)->self->is_active(self,true);
	return false;
}

static void
perform_pending_paints( void)
{
	PDrawableSysData selfxx, next;

	for ( XX = TAILQ_FIRST( &guts.paintq); XX != nil; ) {
		next = TAILQ_NEXT( XX, paintq_link);
		if ( XX-> flags. paint_pending && (guts. appLock == 0) &&
			(PWidget( XX->self)-> stage == csNormal)) {
			TAILQ_REMOVE( &guts.paintq, XX, paintq_link);
			XX-> flags. paint_pending = false;
			prima_simple_message( XX-> self, cmPaint, false);
			/* handle the case where this widget is locked */
			if (XX->invalid_region) {
				XDestroyRegion(XX->invalid_region);
				XX->invalid_region = nil;
			}
		} 
		XX = next;
	}
}

static void
send_pending_events( void)
{
	PendingEvent *pe, *next;
	int stage;

	for ( pe = TAILQ_FIRST( &guts.peventq); pe != nil; ) {
		next = TAILQ_NEXT( pe, peventq_link);
		if (( stage = PComponent( pe->recipient)-> stage) != csConstructing) {
			TAILQ_REMOVE( &guts.peventq, pe, peventq_link);
		}
		if ( stage == csNormal)
			apc_message( pe-> recipient, &pe-> event, false);
		if ( stage != csConstructing) {
			free( pe);
		}
		pe = next;
	}
}

Bool
prima_one_loop_round( Bool wait, Bool careOfApplication)
{
	XEvent ev, next_event;
	fd_set read_set, write_set, excpt_set;
	struct timeval timeout;
	int r, i, queued_events;
	PTimerSysData timer;

	if ( guts. applicationClose) return false;

	if (( queued_events = XEventsQueued( DISP, QueuedAlready))) {
		goto FetchAndProcess;
	}
	read_set = guts.read_set;
	write_set = guts.write_set;
	excpt_set = guts.excpt_set;
	if ( guts. oldest) {
		gettimeofday( &timeout, nil);
		if ( guts. oldest-> when. tv_sec < timeout. tv_sec ||
			( guts. oldest-> when. tv_sec == timeout. tv_sec &&
				guts. oldest-> when. tv_usec <= timeout. tv_usec)) {
			timer = guts. oldest;
			apc_timer_start( timer-> who);
			if ( timer-> who == CURSOR_TIMER) {
				prima_cursor_tick();
			} else if ( timer-> who == MENU_TIMER) {
				apc_timer_stop( MENU_TIMER);
				if ( guts. currentMenu) {
					XEvent ev;
					ev. type = MenuTimerMessage;
					prima_handle_menu_event( &ev, M(guts. currentMenu)-> w-> w, guts. currentMenu);
				}
			} else if ( timer-> who == MENU_UNFOCUS_TIMER) {
				prima_end_menu();
			} else {
				prima_simple_message( timer-> who, cmTimer, false);
			}
			gettimeofday( &timeout, nil);
		}
		if ( guts. oldest && wait) {
			if ( guts. oldest-> when. tv_sec < timeout. tv_sec) {
				timeout. tv_sec = 0;
				timeout. tv_usec = 0;
			} else {
				timeout. tv_sec = guts. oldest-> when. tv_sec - timeout. tv_sec;
				if ( guts. oldest-> when. tv_usec < timeout. tv_usec) {
					if ( timeout. tv_sec == 0) {
						timeout. tv_sec = 0;
						timeout. tv_usec = 0;
					} else {
						timeout. tv_sec--;
						timeout. tv_usec = 1000000 - (timeout. tv_usec - guts. oldest-> when. tv_usec);
					}
				} else {
					timeout. tv_usec = guts. oldest-> when. tv_usec - timeout. tv_usec;
				}
			}
			if ( timeout. tv_sec > 0 || timeout. tv_usec > 200000) {
				timeout. tv_sec = 0;
				timeout. tv_usec = 200000;
			}
		} else {
			timeout. tv_sec = 0;
			if ( wait)
				timeout. tv_usec = 200000;
			else
				timeout. tv_usec = 0;
		}
	} else {
		timeout. tv_sec = 0;
		if ( wait)
			timeout. tv_usec = 200000;
		else
			timeout. tv_usec = 0;
	}
	if (( r = select( guts.max_fd+1, &read_set, &write_set, &excpt_set, &timeout)) > 0 &&
		FD_ISSET( guts.connection, &read_set)) {
		if (( queued_events = XEventsQueued( DISP, QueuedAfterFlush)) <= 0) {
			/* just like tcl/perl tk do, to avoid an infinite loop */
			RETSIGTYPE oldHandler = signal( SIGPIPE, SIG_IGN);
			XNoOp( DISP);
			XFlush( DISP);
			(void) signal( SIGPIPE, oldHandler);
		}
FetchAndProcess:
		if ( queued_events && ( application || !careOfApplication)) {
			XNextEvent( DISP, &ev);
			XCHECKPOINT;
			queued_events--;
			while ( queued_events > 0) {
				if (!application && careOfApplication) return false;
				XNextEvent( DISP, &next_event);
				XCHECKPOINT;
				prima_handle_event( &ev, &next_event);
				guts. total_events++;
				queued_events = XEventsQueued( DISP, QueuedAlready);
				memcpy( &ev, &next_event, sizeof( XEvent));
			}
			if (!application && careOfApplication) return false;
			guts. total_events++;
			prima_handle_event( &ev, nil);
		}
		XNoOp( DISP);
		XFlush( DISP);
	} else if ( r < 0) {
		list_first_that( guts.files, (void*)purge_invalid_watchers, nil);
	} else {
		if ( r > 0) {
			for ( i = 0; i < guts.files->count; i++) {
				PFile f = (PFile)list_at( guts.files,i);
				if ( FD_ISSET( f->fd, &read_set) && (f->eventMask & feRead)) {
					prima_simple_message((Handle)f, cmFileRead, false);
					break;
				} else if ( FD_ISSET( f->fd, &write_set) && (f->eventMask & feWrite)) {
					prima_simple_message((Handle)f, cmFileWrite, false);
					break;
				} else if ( FD_ISSET( f->fd, &excpt_set) && (f->eventMask & feException)) {
					prima_simple_message((Handle)f, cmFileException, false);
					break;
				}
			}
		} else {
			XNoOp( DISP);
			XFlush( DISP);
		}
	}
	send_pending_events();
	perform_pending_paints();
	kill_zombies();
	return application != nilHandle;
}

Bool
apc_application_go( Handle self)
{
	if (!application) return false;

	XNoOp( DISP);
	XFlush( DISP);

	while ( prima_one_loop_round( true, true))
		;

	if ( application) Object_destroy( application);
	application = nilHandle;
	return true;
}

Bool
apc_application_lock( Handle self)
{
	guts. appLock++;
	return true;
}

Bool
apc_application_unlock( Handle self)
{
	if ( guts. appLock > 0) guts. appLock--;
	return true;
}

Bool
apc_application_sync(void)
{
	XSync( DISP, false);
	return true;
}

Bool
apc_application_yield( void)
{
	if (!application) return false;
	XSync( DISP, false);
	prima_one_loop_round( false, true);
	XSync( DISP, false);
	prima_one_loop_round( false, true);
	return true;
}
