/* ************************************
 * vim:tabstop=4:shiftwidth=4
 * xutils.c
 * Sun, 05 Mar 2006 17:56:56 +0600
 * ************************************
 * misc X11 utilities
 * ************************************/

#include "config.h"

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

#include <limits.h>
#include <unistd.h>

#include "xutils.h"

#include "xembed.h"
#include "debug.h"
#include "common.h"

static int trapped_x11_error_code = 0;
static int (*old_x11_error_handler) (Display *, XErrorEvent *) = NULL;
static int current_x11_connection_status = 1;
static int (*old_x11_io_error_handler) (Display *) = NULL;

int x11_io_error_handler(Display *dpy)
{
	current_x11_connection_status = 0;
    old_x11_io_error_handler(dpy);
	DIE(("Connection to X11 server lost. Dying.\n"));
}

int x11_connection_status()
{
	return current_x11_connection_status;
}

int x11_error_handler(Display *dpy, XErrorEvent *err)
{
	static char msg[PATH_MAX], req_num_str[32], req_str[PATH_MAX];
	trapped_x11_error_code = err->error_code;
	XGetErrorText(dpy, trapped_x11_error_code, msg, sizeof(msg)-1);
	snprintf(req_num_str, 32, "%d", err->request_code);
	XGetErrorDatabaseText(dpy, "XRequest", req_num_str, "Unknown", req_str, PATH_MAX);
	LOG_ERROR(("X11 error: %s (request: %s, resource 0x%x)\n", msg, req_str, err->request_code, err->minor_code, err->resourceid));
	return 0;
}

int x11_ok_helper(const char *file, const int line, const char *func)
{
	if (trapped_x11_error_code) {
		LOG_ERROR(("X11 error %d detected at %s:%d:%s\n", 
					trapped_x11_error_code,
					file,
					line,
					func));
		trapped_x11_error_code = 0;
		return FAILURE;
	} else
		return SUCCESS;
}

int x11_current_error() 
{
	return trapped_x11_error_code;
}

void x11_trap_errors()
{
	old_x11_io_error_handler = XSetIOErrorHandler(x11_io_error_handler);
	old_x11_error_handler = XSetErrorHandler(x11_error_handler);
	trapped_x11_error_code = 0;
}

int x11_untrap_errors()
{
	XSetErrorHandler(old_x11_error_handler);
	return trapped_x11_error_code;
}

static Window timestamp_wnd;
static Atom timestamp_atom = None;

Bool x11_wait_for_timestamp(Display *dpy, XEvent *xevent, XPointer data)
{
	return ((xevent->type == PropertyNotify &&
	    xevent->xproperty.window == *((Window *)data) &&
		xevent->xproperty.atom == timestamp_atom) ||
	   (xevent->type == DestroyNotify &&
		xevent->xdestroywindow.window == *((Window *)data)));
}

Time x11_get_server_timestamp(Display *dpy, Window wnd)
{
	unsigned char c = 's';
	XEvent xevent;

	if (timestamp_atom == None) 
		timestamp_atom = XInternAtom(dpy, "STALONETRAY_TIMESTAMP", False);

	x11_ok(); /* Just reset the status (XXX) */
	/* Trigger PropertyNotify event which has a timestamp field */
	XChangeProperty(dpy, wnd, timestamp_atom, timestamp_atom, 8, PropModeReplace, &c, 1);
	if (!x11_ok()) return CurrentTime;

	/* Wait for the event
	 * XXX: this may block... */
	timestamp_wnd = wnd;
	XIfEvent(dpy, &xevent, x11_wait_for_timestamp, (XPointer)&timestamp_wnd);

	return x11_ok() ? xevent.xproperty.time : CurrentTime;
}

int x11_get_window_prop32(Display *dpy, Window dst, Atom atom, Atom type, unsigned char **data, unsigned long *len)
{
	Atom act_type;
	int act_fmt, rc;
	unsigned long bytes_after, prop_len, buf_len;
	unsigned char *buf = NULL;	

	*data = NULL; *len = 0;
	/* Get the property size */
	rc = XGetWindowProperty(dpy, dst, atom, 
		    0L, 1L, False, type, &act_type, &act_fmt,
			&buf_len, &bytes_after, &buf);

	/* The requested property does not exist */
	if (!x11_ok() || rc != Success || act_type != type || act_fmt != 32) return FAILURE;

	if (buf != NULL) XFree(buf);

	/* Now go get the property */
	prop_len = bytes_after / 4 + 1;
	XGetWindowProperty(dpy, dst, atom,
			0L, prop_len, False, type, &act_type, &act_fmt,
			&buf_len, &bytes_after, &buf);

	if (x11_ok()) {
		*len = buf_len;
		*data = buf;
		return SUCCESS;
	} else {
		return FAILURE;
	}
}

int x11_send_client_msg32(Display *dpy, Window dst, Window wnd, Atom type, long data0, long data1, long data2, long data3, long data4)
{
	XEvent ev;
	Status rc;
	ev.xclient.type = ClientMessage;
	ev.xclient.serial = 0;
	ev.xclient.send_event = True;
	ev.xclient.message_type = type;
	ev.xclient.window = wnd;
	ev.xclient.format = 32;
	ev.xclient.data.l[0] = data0;
	ev.xclient.data.l[1] = data1;
	ev.xclient.data.l[2] = data2;
	ev.xclient.data.l[3] = data3;
	ev.xclient.data.l[4] = data4;
	/* XXX: Replace 0xFFFFFF for better portability? */
	/* XXX: This should actually read NoEventMask...
	 * seems like extra parameter is necessary */
	rc = XSendEvent(dpy, dst, False, 0xFFFFFF, &ev);
	return x11_ok() && rc != 0;
}

int x11_send_visibility(Display *dpy, Window dst, long state)
{
	XEvent xe;
	int rc;
	xe.type = VisibilityNotify;
	xe.xvisibility.window = dst;
	xe.xvisibility.state = state;
	rc = XSendEvent(tray_data.dpy, dst, True, NoEventMask, &xe);
	return x11_ok() && rc != 0;
}

int x11_send_button(Display *dpy, 
		int press, Window dst, Window root, Time time,
		unsigned int button, unsigned int state, 
		int x, int y)
{
	XEvent ev;
	int rx, ry, rc, idummy;
	unsigned int udummy;
	Window dst_root;

	if (!x11_get_window_abs_coords(dpy, dst, &rx, &ry)) return FAILURE;
	XGetGeometry(dpy, dst, &dst_root, 
			&idummy, &idummy, 
			&udummy, &udummy, &udummy, &udummy);
	if (!x11_ok()) return FAILURE;

	ev.type = press ? ButtonPress : ButtonRelease;
	ev.xbutton.display = dpy;
	ev.xbutton.window = dst;
	ev.xbutton.subwindow = None;
	ev.xbutton.root = root;
	ev.xbutton.time = time;
	ev.xbutton.x = x;
	ev.xbutton.y = y;
	ev.xbutton.x_root = rx + x; 
	ev.xbutton.y_root = ry + y;
	ev.xbutton.button = button;
	ev.xbutton.state = state;
	ev.xbutton.same_screen = (root == dst_root);

	rc = XSendEvent(dpy, dst, True, 
			SubstructureNotifyMask | (press ? ButtonPressMask : ButtonReleaseMask),
			&ev);
	return rc && x11_ok();
}

int x11_send_expose(Display *dpy, Window dst, int x, int y, int width, int height)
{
	XEvent xe;
	int rc;
	xe.type = Expose;
	xe.xexpose.window = dst;
	xe.xexpose.x = x;
	xe.xexpose.y = y;
	xe.xexpose.width = width;
	xe.xexpose.height = height;
	xe.xexpose.count = 0;
	rc = XSendEvent(tray_data.dpy, dst, True, NoEventMask, &xe);
	return x11_ok() && rc != 0;
}

int x11_refresh_window(Display *dpy, Window dst, int width, int height, int exposures)
{
	x11_send_visibility(tray_data.dpy, dst, VisibilityFullyObscured);
	x11_send_visibility(tray_data.dpy, dst, VisibilityUnobscured);
	XClearArea(tray_data.dpy, dst, 0, 0, width, height, exposures);
	return x11_ok();
}

int x11_set_window_size(Display *dpy, Window w, int x, int y)
{
	XSizeHints xsh;
	xsh.flags = PSize;
	xsh.width = x;
	xsh.height = y;
	XSetWMNormalHints(dpy, w, &xsh);
	XResizeWindow(dpy, w, x, y);
	if (!x11_ok()) return FAILURE;
	return SUCCESS;
}

int x11_get_window_size(Display *dpy, Window w, int *x, int *y)
{
	XWindowAttributes xwa;
	XGetWindowAttributes(dpy, w, &xwa);
	if (!x11_ok()) return FAILURE;
	*x = xwa.width;
	*y = xwa.height;
	return SUCCESS;
}

int x11_get_window_min_size(Display *dpy, Window w, int *x, int *y)
{
	XSizeHints xsh;
	long flags = 0;
	int rc = FAILURE;
	if (XGetWMNormalHints(dpy, w, &xsh, &flags)) {
		flags = xsh.flags & flags;
		if (flags & PMinSize) {
			*x = xsh.min_width;
			*y = xsh.min_height;
			rc = SUCCESS;
		}
	}
	return x11_ok() && rc;
}

int x11_get_window_abs_coords(Display *dpy, Window dst, int *x, int *y)
{
	XWindowAttributes xwa;
	Window child;
#if 0
	x11_ok(); /* XXX: this should go away, shouldn't it? */
#endif
	XGetWindowAttributes(dpy, dst, &xwa);
	XTranslateCoordinates(dpy, dst, xwa.root, 0, 0, x, y, &child);
	return x11_ok();
}

char *x11_get_window_name(Display *dpy, Window dst, char *def)
{
	static char *name;
	if (name != NULL) XFree(name);
	if (!XFetchName(dpy, dst, &name)) name = NULL;
	return (name != NULL ? name : def);
}

Window x11_find_subwindow_by_name(Display *dpy, Window tgt, char *name)
{
	char *tgt_name = NULL;
	Window ret = None, *children, dummy;
	int i;
	unsigned int nchildren;
	if (XFetchName(dpy, tgt, &tgt_name)) {
		LOG_TRACE(("tgt_name=\"%s\", name=\"%s\"\n", tgt_name, name));
		if (!strcmp(tgt_name, name)) ret = tgt;
	}
	if (!x11_ok()) return None;
	if (tgt_name != NULL) XFree(tgt_name);
	if (ret != None) return ret;
	XQueryTree(dpy, tgt, &dummy, &dummy, &children, &nchildren);
	if (!x11_ok()) return None;
	for (i = 0; i < nchildren; i++) {
		ret = x11_find_subwindow_by_name(dpy, children[i], name);
		if (ret != None) break;
	}
	if (children != NULL) XFree(children);
	return ret;
}

/* x and y are relative to top at input, and relative to found window on return */
Window x11_find_subwindow_at(Display *dpy, Window top, int *x, int *y, int depth)
{
	int d, c, bx = 0, by = 0;
	Window dummy, *children;
	unsigned int nchildren;
	Window cur = top, old = None;
	for (d = 1; d != depth && cur != old && old != None; d++)
	{
		old = cur;
		/* Query children of current window and traverse them starting
		 * from the top in stacking order (i.e. from the end of the list
		 * returned by XQueryTree) */
		XQueryTree(dpy, cur, &dummy, &dummy, &children, &nchildren);
		LOG_TRACE(("cur=0x%x nchildren=%d\n", cur, nchildren));
		if (!x11_ok()) goto fail;
		/* Exit the loop if window has no children */
		if (nchildren == 0) break;
		/* Loop over children starting from topmost */
		for (c = nchildren-1; c >=0; c--) {
			XWindowAttributes xwa;
			XGetWindowAttributes(dpy, children[c], &xwa);
			if (!x11_ok()) goto fail;
			/* Check if this child contains the (x,y) point */
			if (xwa.x + bx <= *x && *x < xwa.x + xwa.width + bx &&
			    xwa.y + by <= *y && *y < xwa.y + xwa.height + by)
			{
				cur = children[c];
				bx += xwa.x; by += xwa.y;
				break;
			}
		}
		if (children != NULL) XFree(children);
	}
	*x -= bx;
	*y -= by;
	return cur;
fail:
	if (children != NULL) XFree(children);
	return None;
}

void x11_extend_root_event_mask(Display *dpy, long mask)
{
	static long old_mask = 0;
	old_mask |= mask;
	XSelectInput(dpy, DefaultRootWindow(dpy), old_mask);
}

int x11_parse_color(Display *dpy, char *str, XColor *color)
{
	int rc;
	rc = XParseColor(dpy, XDefaultColormap(dpy, DefaultScreen(dpy)), str, color);
	if (rc) XAllocColor(dpy, XDefaultColormap(dpy, DefaultScreen(dpy)), color);
	return x11_ok() && rc;
}

#ifdef DEBUG
const char *x11_event_names[LASTEvent] = {
	"unknown0",
	"unknown1",
	"KeyPress",
	"KeyRelease",
	"ButtonPress",
	"ButtonRelease",
	"MotionNotify",
	"EnterNotify",
	"LeaveNotify",
	"FocusIn",
	"FocusOut",
	"KeymapNotify",
	"Expose",
	"GraphicsExpose",
	"NoExpose",
	"VisibilityNotify",
	"CreateNotify",
	"DestroyNotify",
	"UnmapNotify",
	"MapNotify",
	"MapRequest",
	"ReparentNotify",
	"ConfigureNotify",
	"ConfigureRequest",
	"GravityNotify",
	"ResizeRequest",
	"CirculateNotify",
	"CirculateRequest",
	"PropertyNotify",
	"SelectionClear",
	"SelectionRequest",
	"SelectionNotify",
	"ColormapNotify",
	"ClientMessage",
	"MappingNotify"
};

void x11_dump_win_info(Display *dpy, Window wid)
{	
#if defined(DEBUG) && defined(ENABLE_DUMP_WIN_INFO)
	if (settings.log_level >= LOG_LEVEL_TRACE) {
		char cmd[PATH_MAX];
		snprintf(cmd, PATH_MAX, "xwininfo -tree -size -bits -stats -id 0x%x 1>&2\n", (unsigned int) wid);
		system(cmd);
		snprintf(cmd, PATH_MAX, "xprop -id 0x%x 1>&2\n", (unsigned int) wid);
		system(cmd);
	}
#endif
}	
#endif