/*
 * gaim
 *
 * Copyright (C) 1998-1999, Mark Spencer <markster@marko.net>
 *
 * some code: (most in this file)
 * Copyright (C) 1996 Netscape Communications Corporation, all rights reserved.
 * Created: Jamie Zawinski <jwz@netscape.com>, 24-Dec-94.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * This code is mainly taken from Netscape's sample implementation of
 * their protocol.  Nifty.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef _WIN32
#include <gdk/gdkwin32.h>
#else
#include <unistd.h>
#ifndef HOST_NAME_MAX
#define HOST_NAME_MAX 255
#endif
#include <gdk/gdkx.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>




#include <gtk/gtk.h>
#include <gdk/gdkprivate.h>
#include "gaim.h"

#ifndef _WIN32




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


static const char *progname = "gaim";
static const char *expected_mozilla_version = "1.1";

#define MOZILLA_VERSION_PROP   "_MOZILLA_VERSION"
#define MOZILLA_LOCK_PROP      "_MOZILLA_LOCK"
#define MOZILLA_COMMAND_PROP   "_MOZILLA_COMMAND"
#define MOZILLA_RESPONSE_PROP  "_MOZILLA_RESPONSE"

static GdkAtom GDKA_MOZILLA_VERSION = 0;
static GdkAtom GDKA_MOZILLA_LOCK = 0;
static GdkAtom GDKA_MOZILLA_COMMAND = 0;
static GdkAtom GDKA_MOZILLA_RESPONSE = 0;

static char *window_check_mozilla_version(Window);
static const char *get_lock_data();
static GdkFilterReturn netscape_response_cb(XEvent *, GdkEvent *, GdkWindow *);
static gboolean netscape_command(const char *);

static int netscape_lock;


static Window VirtualRootWindowOfScreen(screen)
Screen *screen;
{
	static Screen *save_screen = (Screen *) 0;
	static Window root = (Window) 0;

	if (screen != save_screen) {
		Display *dpy = DisplayOfScreen(screen);
		Atom __SWM_VROOT = None;
		unsigned int i;
		Window rootReturn, parentReturn, *children;
		unsigned int numChildren;

		root = RootWindowOfScreen(screen);

		/* go look for a virtual root */
		__SWM_VROOT = XInternAtom(dpy, "__SWM_VROOT", False);
		if (XQueryTree(dpy, root, &rootReturn, &parentReturn, &children, &numChildren)) {
			for (i = 0; i < numChildren; i++) {
				Atom actual_type;
				int actual_format;
				unsigned long nitems, bytesafter;
				Window *newRoot = (Window *) 0;

				if (XGetWindowProperty(dpy, children[i],
						       __SWM_VROOT, 0, 1, False, XA_WINDOW,
						       &actual_type, &actual_format,
						       &nitems, &bytesafter,
						       (unsigned char **)&newRoot) == Success
				    && newRoot) {
					root = *newRoot;
					break;
				}
			}
			if (children)
				XFree((char *)children);
		}

		save_screen = screen;
	}

	return root;
}

/* The following code is Copyright (C) 1989 X Consortium */

static Window TryChildren();

/* Find a window with WM_STATE, else return win itself, as per ICCCM */

static Window GClientWindow(dpy, win)
Display *dpy;
Window win;
{
	Atom WM_STATE;
	Atom type = None;
	int format;
	unsigned long nitems, after;
	unsigned char *data;
	Window inf;

	WM_STATE = XInternAtom(dpy, "WM_STATE", True);
	if (!WM_STATE)
		return win;
	XGetWindowProperty(dpy, win, WM_STATE, 0, 0, False, AnyPropertyType,
			   &type, &format, &nitems, &after, &data);
	if (type) {
		XFree(data);
		return win;
	}

	inf = TryChildren(dpy, win, WM_STATE);
	if (!inf)
		inf = win;

	XFree(data);

	return inf;
}

static
Window TryChildren(dpy, win, WM_STATE)
Display *dpy;
Window win;
Atom WM_STATE;
{
	Window root, parent;
	Window *children;
	unsigned int nchildren;
	unsigned int i;
	Atom type = None;
	int format;
	unsigned long nitems, after;
	unsigned char *data;
	Window inf = 0;

	if (!XQueryTree(dpy, win, &root, &parent, &children, &nchildren))
		return 0;
	for (i = 0; !inf && (i < nchildren); i++) {
		XGetWindowProperty(dpy, children[i], WM_STATE, 0, 0, False,
				   AnyPropertyType, &type, &format, &nitems, &after, &data);
		if (type)
			inf = children[i];

		XFree(data);
	}
	for (i = 0; !inf && (i < nchildren); i++)
		inf = TryChildren(dpy, children[i], WM_STATE);
	if (children)
		XFree((char *)children);
	return inf;
}

/* END X Consortium code */



static void mozilla_remote_init_atoms()
{
	if (!GDKA_MOZILLA_VERSION)
		GDKA_MOZILLA_VERSION = gdk_atom_intern(MOZILLA_VERSION_PROP, 0);
	if (!GDKA_MOZILLA_LOCK)
		GDKA_MOZILLA_LOCK = gdk_atom_intern(MOZILLA_LOCK_PROP, 0);
	if (!GDKA_MOZILLA_COMMAND)
		GDKA_MOZILLA_COMMAND = gdk_atom_intern(MOZILLA_COMMAND_PROP, 0);
	if (!GDKA_MOZILLA_RESPONSE)
		GDKA_MOZILLA_RESPONSE = gdk_atom_intern(MOZILLA_RESPONSE_PROP, 0);
}

static char *window_check_mozilla_version(Window window) {

	Atom type;
	int format;
	unsigned long nitems, bytesafter;
	unsigned char *version = 0;
	gchar *retval = NULL;

	if (XGetWindowProperty(gdk_display, window, 
					gdk_x11_atom_to_xatom(GDKA_MOZILLA_VERSION),
					0, (65536 / sizeof(long)),
					False, XA_STRING,
					&type, &format, &nitems, &bytesafter,
					&version) != Success) {	
		return NULL;
	}

	if (!version) {
		return NULL;
	}

	retval = g_strdup(version);
	XFree(version);

	return retval;
}

static GdkWindow *mozilla_remote_find_window()
{
	int i;
	Window root = VirtualRootWindowOfScreen(DefaultScreenOfDisplay(gdk_display));
	Window root2, parent, *kids;
	unsigned int nkids;
	Window result = 0;
	Window tenative = 0;
	unsigned char *tenative_version = 0, *version = 0;
	static GdkWindow *remote_window = NULL;

	if (remote_window != NULL) {
		version = window_check_mozilla_version(GDK_WINDOW_XID(remote_window));

		if (version != NULL) {
			g_free(version);
			return remote_window;
		}
		g_free(version);

		gdk_window_destroy(remote_window);
		remote_window = NULL;
	}

	if (!XQueryTree(gdk_display, root, &root2, &parent, &kids, &nkids)) {
		debug_printf("%s: XQueryTree failed on display %s\n", progname,
			     DisplayString(gdk_display));
		return NULL;
	}

	/* root != root2 is possible with virtual root WMs. */

	if (!(kids && nkids)) {
		debug_printf("%s: root window has no children on display %s\n",
			     progname, DisplayString(gdk_display));
		return NULL;
	}

	for (i = nkids - 1; i >= 0; i--) {
		Window w = GClientWindow(gdk_display, kids[i]);

        version = window_check_mozilla_version(w);

		if (version == NULL) {
			continue;
		}

		if (strcmp((char *)version, expected_mozilla_version) && !tenative) {
			tenative = w;
			tenative_version = version;
			continue;
		}

		g_free(version);

			result = w;
			break;
		}

	XFree(kids);

	if (result && tenative) {
		debug_printf("%s: warning: both version %s (0x%x) and version\n"
			     "\t%s (0x%x) are running.  Using version %s.\n",
			     progname, tenative_version, (unsigned int)tenative,
			     expected_mozilla_version, (unsigned int)result, expected_mozilla_version);
		XFree(tenative_version);
		return gdk_window_foreign_new(result);
	} else if (tenative) {
		debug_printf("%s: warning: expected version %s but found version\n"
			     "\t%s (0x%x) instead.\n",
			     progname, expected_mozilla_version,
			     tenative_version, (unsigned int)tenative);
		XFree(tenative_version);
		return gdk_window_foreign_new(tenative);
	} else if (result) {
		return gdk_window_foreign_new(result);
	} else {
		debug_printf("%s: not running on display %s\n", progname, DisplayString(gdk_display));
		return NULL;
	}
}


static const char *get_lock_data() {
	static char *lock_data = NULL;

	if (lock_data == NULL) {
		char hostname[HOST_NAME_MAX + 1] = {0}; 

		if (gethostname(hostname, HOST_NAME_MAX + 1) == 0) {
			lock_data = g_strdup_printf("pid%d@%s", getpid(), hostname);
		} else {
			lock_data = g_strdup_printf("pid%d", getpid());
		}
	}

	return lock_data;
}

static void mozilla_remote_obtain_lock(GdkWindow * window)
{
	gboolean locked = False;
	const char *lock_data = get_lock_data();
		GdkAtom actual_type;
		gint actual_format;
		gint nitems;
		unsigned char *data = 0;

	gdk_x11_grab_server();
	if (!gdk_property_get(window, GDKA_MOZILLA_LOCK,
					  gdk_x11_xatom_to_atom (XA_STRING), 0,
					  (65536 / sizeof(long)), 0,
				  &actual_type, &actual_format, &nitems, &data)) {

			/* It's not now locked - lock it. */
		debug_printf("%s: (writing " MOZILLA_LOCK_PROP " \"%s\" to 0x%x)\n", 
					 progname, lock_data, (unsigned int) window);

			gdk_property_change(window, GDKA_MOZILLA_LOCK, 
					    gdk_x11_xatom_to_atom (XA_STRING),
					    8, PropModeReplace,
					    (unsigned char *)lock_data, strlen(lock_data));
			locked = True;
		}

			if (data)
				g_free(data);
	gdk_x11_ungrab_server();
}


static void mozilla_remote_free_lock(GdkWindow * window)
{
	int result = 0;
	GdkAtom actual_type;
	gint actual_format; 
	gint nitems;
	unsigned char *data = 0;
	const char *lock_data = get_lock_data();

	debug_printf("%s: (deleting " MOZILLA_LOCK_PROP
		     " \"%s\" from 0x%x)\n", progname, lock_data, (unsigned int)window);

	result = gdk_property_get(window, GDKA_MOZILLA_LOCK, 
				  gdk_x11_xatom_to_atom (XA_STRING),
				  0, (65536 / sizeof(long)),
				  1, &actual_type, &actual_format, &nitems, &data);

	if (result != TRUE) {
		debug_printf("%s: unable to read and delete " MOZILLA_LOCK_PROP " property\n", progname);
		return;
	} else if (!data || !*data) {
		debug_printf("%s: invalid data on " MOZILLA_LOCK_PROP
			     " of window 0x%x.\n", progname, (unsigned int)window);
		return;
	} else if (strcmp((char *)data, lock_data)) {
		debug_printf("%s: " MOZILLA_LOCK_PROP
			     " was stolen!  Expected \"%s\", saw \"%s\"!\n", progname, lock_data, data);
		return;
	}

	XFree(data);
}

static GdkFilterReturn netscape_response_cb(XEvent *event, GdkEvent *translated, GdkWindow *window)
{
	Atom actual_type, mozilla_response;
	Window xid;
	int actual_format;
	unsigned long nitems, bytes_after;
	unsigned char *data = 0;

	if (window == NULL || GDK_WINDOW_OBJECT(window)->destroyed) {
		do_error_dialog(_("Communication with the browser failed.  Please close all "
					      "windows and try again."), NULL, GAIM_ERROR);
		debug_printf("netscape_response_cb called with NULL window.\n");
		return GDK_FILTER_CONTINUE;
	}

	mozilla_response = gdk_x11_atom_to_xatom(GDKA_MOZILLA_RESPONSE);
    xid = GDK_WINDOW_XID(window);

	/* If the event isn't what we want then let gtk handle it */
	if (event->xany.type != PropertyNotify ||
		event->xproperty.state != PropertyNewValue ||
		event->xproperty.window != xid ||
		event->xproperty.atom != mozilla_response) {
		return GDK_FILTER_CONTINUE;
	}

	if (XGetWindowProperty (gdk_display, xid, mozilla_response,
							 0, (65536 / sizeof (long)),
							 True, 
							 XA_STRING, 
							 &actual_type, &actual_format,
							 &nitems, &bytes_after,
							 &data) != Success 
		|| data == NULL || (data[0] != '1' && data[0] != '2')) {

		do_error_dialog(_("Communication with the browser failed.  Please close all "
					      "windows and try again."), NULL, GAIM_ERROR);
	} 

    if (data[0] == '1') {
		/* Netscape isn't ready yet */
		debug_printf("Remote Netscape window isn't ready yet.\n");
		return GDK_FILTER_REMOVE;
	} 
	
	if (data[0] == '2') {
		/* Yay! It worked */ 
		debug_printf("Successfully sent command to remote Netscape window.\n");
	}

	gdk_window_remove_filter(window, (GdkFilterFunc) netscape_response_cb, window); 
	mozilla_remote_free_lock(window);
	netscape_lock = 0;
	return GDK_FILTER_REMOVE;
}

static void mozilla_remote_command(GdkWindow * window, const char *command, Bool raise_p)
{
	char *new_command = 0;

	/* The -noraise option is implemented by passing a "noraise" argument
	   to each command to which it should apply.
	 */
	if (!raise_p) {
		char *close;
		new_command = g_malloc(strlen(command) + 20);
		strcpy(new_command, command);
		close = strrchr(new_command, ')');
		if (close)
			strcpy(close, ", noraise)");
		else
			strcat(new_command, "(noraise)");
		command = new_command;
	}

	debug_printf("%s: (writing " MOZILLA_COMMAND_PROP " \"%s\" to 0x%x)\n",
		     progname, command, (unsigned int)window);

	gdk_property_change(window, GDKA_MOZILLA_COMMAND, 
			    gdk_x11_xatom_to_atom (XA_STRING), 
			    8, GDK_PROP_MODE_REPLACE, (unsigned char *)command, strlen(command));

	gdk_window_add_filter(window, (GdkFilterFunc) netscape_response_cb, window);
}

static gboolean netscape_command(const char *command)
{
 	GdkWindow *window = NULL;
 
 	if (netscape_lock) {
 		debug_printf("netscape_command() is currently in use.\n");
		return FALSE;
	}

	netscape_lock = 1;

	mozilla_remote_init_atoms();
	window = mozilla_remote_find_window();

	if (window == NULL || (GDK_WINDOW_OBJECT(window)->destroyed == TRUE)) {
 		debug_printf("Remote window absent or unsuitable.\n");
		netscape_lock = 0;
		return FALSE;
	}

	mozilla_remote_command(window, command, False);

	netscape_lock = 0;
	return TRUE;
}

void open_url(GtkWidget *w, char *url)
{
	char *command = NULL;
	GError *error = NULL;

	switch (web_browser) {
		case BROWSER_NETSCAPE: {
			char *args = NULL;

			if (misc_options & OPT_MISC_BROWSER_POPUP)
				args = g_strdup_printf("OpenURL(%s, new-window)", url);
			else
				args = g_strdup_printf("OpenURL(%s)", url);

			if (netscape_command(args)) {
				g_free(args);
				return;
			}

			/* if netscape is running ...
			command = g_strdup_printf("netscape -remote %s", args); */

			command = g_strdup_printf("netscape \"%s\"", url);
			g_free(args);
			} break;

		case BROWSER_OPERA:
			if (misc_options & OPT_MISC_BROWSER_POPUP)
				command = g_strdup_printf("opera -newwindow \"%s\"", url);
			else
				command = g_strdup_printf("opera \"%s\"", url);
			break;

		case BROWSER_KONQ:
			command = g_strdup_printf("kfmclient openURL \"%s\"", url);
			break;

		case BROWSER_GALEON:
			if (misc_options & OPT_MISC_BROWSER_POPUP)
				command = g_strdup_printf("galeon -w \"%s\"", url);
			else
				command = g_strdup_printf("galeon \"%s\"", url);
			break;

		case BROWSER_MOZILLA:
			command = g_strdup_printf("mozilla \"%s\"", url);
			break;

		case BROWSER_MANUAL: {
			char *space_free_url = NULL;

			if (!web_command[0]) {
				do_error_dialog(_("Unable to launch your browser because the 'Manual' browser command has been chosen, but no command has been set."), NULL, GAIM_ERROR);
				return;
			}

			space_free_url = g_strdup(url);
			g_strdelimit(space_free_url, " ", '+');
			command = g_strdup_printf("%s %s", web_command, space_free_url);
 			g_free(space_free_url);
 			} break;
	}

	if (g_spawn_command_line_async(command, &error) == FALSE) {
		char *tmp = g_strdup_printf(_("There was an error launching your chosen browser: %s"), error->message);
		do_error_dialog(tmp, NULL, GAIM_ERROR);
		g_free(tmp);
		g_error_free(error);
 	}

	g_free(command);
}

void add_bookmark(GtkWidget *w, char *url)
{
	if (web_browser == BROWSER_NETSCAPE) {
		char *command = g_strdup_printf("AddBookmark(%s)", url);

		netscape_command(command);
		g_free(command);
	}
}

#else

/* Sooner or later, I shall support Windows clicking! */

void add_bookmark(GtkWidget *w, char *url)
{
}
void open_url(GtkWidget *w, char *url)
{
	ShellExecute(NULL, NULL, url, NULL, ".\\", 0);
}


#endif /* _WIN32 */
