/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "config.h"

#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#ifdef __linux
#include <sys/prctl.h>
#endif

#include <locale.h>

#include <glib.h>
#include <glib/gi18n.h>
#include <gio/gio.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <gdk/gdkkeysyms.h>
#include <X11/keysym.h>
#include <X11/Xatom.h>

#include <X11/extensions/XInput.h>
#include <X11/extensions/XIproto.h>

#include "gnome-settings-profile.h"
#include "gsd-mouse-manager.h"
#include "gsd-input-helper.h"
#include "gsd-enums.h"

#define GSD_MOUSE_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GSD_TYPE_MOUSE_MANAGER, GsdMouseManagerPrivate))

#define SETTINGS_MOUSE_DIR         "org.gnome.settings-daemon.peripherals.mouse"
#define SETTINGS_TOUCHPAD_DIR      "org.gnome.settings-daemon.peripherals.touchpad"

/* Keys for both touchpad and mouse */
#define KEY_LEFT_HANDED         "left-handed"                /* a boolean for mouse, an enum for touchpad */
#define KEY_MOTION_ACCELERATION "motion-acceleration"
#define KEY_MOTION_THRESHOLD    "motion-threshold"

/* Touchpad settings */
#define KEY_TOUCHPAD_DISABLE_W_TYPING    "disable-while-typing"
#define KEY_PAD_HORIZ_SCROLL             "horiz-scroll-enabled"
#define KEY_SCROLL_METHOD                "scroll-method"
#define KEY_TAP_TO_CLICK                 "tap-to-click"
#define KEY_TOUCHPAD_ENABLED             "touchpad-enabled"
#define KEY_NATURAL_SCROLL_ENABLED       "natural-scroll"

/* Mouse settings */
#define KEY_LOCATE_POINTER               "locate-pointer"
#define KEY_DWELL_CLICK_ENABLED          "dwell-click-enabled"
#define KEY_SECONDARY_CLICK_ENABLED      "secondary-click-enabled"
#define KEY_MIDDLE_BUTTON_EMULATION      "middle-button-enabled"

struct GsdMouseManagerPrivate
{
        guint start_idle_id;
        GSettings *touchpad_settings;
        GSettings *mouse_settings;
        GSettings *mouse_a11y_settings;
        GdkDeviceManager *device_manager;
        guint device_added_id;
        guint device_removed_id;
        GHashTable *blacklist;

        gboolean mousetweaks_daemon_running;
        gboolean syndaemon_spawned;
        GPid syndaemon_pid;
        gboolean locate_pointer_spawned;
        GPid locate_pointer_pid;
};

static void     gsd_mouse_manager_class_init  (GsdMouseManagerClass *klass);
static void     gsd_mouse_manager_init        (GsdMouseManager      *mouse_manager);
static void     gsd_mouse_manager_finalize    (GObject             *object);
static void     set_tap_to_click              (GdkDevice           *device,
                                               gboolean             state,
                                               gboolean             left_handed);
static void     set_natural_scroll            (GsdMouseManager *manager,
                                               GdkDevice       *device,
                                               gboolean         natural_scroll);

G_DEFINE_TYPE (GsdMouseManager, gsd_mouse_manager, G_TYPE_OBJECT)

static gpointer manager_object = NULL;


static void
gsd_mouse_manager_class_init (GsdMouseManagerClass *klass)
{
        GObjectClass   *object_class = G_OBJECT_CLASS (klass);

        object_class->finalize = gsd_mouse_manager_finalize;

        g_type_class_add_private (klass, sizeof (GsdMouseManagerPrivate));
}

static XDevice *
open_gdk_device (GdkDevice *device)
{
        XDevice *xdevice;
        int id;

        g_object_get (G_OBJECT (device), "device-id", &id, NULL);

        gdk_error_trap_push ();

        xdevice = XOpenDevice (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), id);

        if (gdk_error_trap_pop () != 0)
                return NULL;

        return xdevice;
}

static gboolean
device_is_blacklisted (GsdMouseManager *manager,
                       GdkDevice       *device)
{
        int id;
        g_object_get (G_OBJECT (device), "device-id", &id, NULL);
        if (g_hash_table_lookup (manager->priv->blacklist, GINT_TO_POINTER (id)) != NULL) {
                g_debug ("device %s (%d) is blacklisted", gdk_device_get_name (device), id);
                return TRUE;
        }
        return FALSE;
}

static gboolean
device_is_ignored (GsdMouseManager *manager,
		   GdkDevice       *device)
{
	GdkInputSource source;
	const char *name;

	if (device_is_blacklisted (manager, device))
		return TRUE;

	source = gdk_device_get_source (device);
	if (source != GDK_SOURCE_MOUSE &&
	    source != GDK_SOURCE_TOUCHPAD &&
	    source != GDK_SOURCE_CURSOR)
		return TRUE;

	name = gdk_device_get_name (device);
	if (name != NULL && g_str_equal ("Virtual core XTEST pointer", name))
		return TRUE;

	return FALSE;
}

static void
configure_button_layout (guchar   *buttons,
                         gint      n_buttons,
                         gboolean  left_handed)
{
        const gint left_button = 1;
        gint right_button;
        gint i;

        /* if the button is higher than 2 (3rd button) then it's
         * probably one direction of a scroll wheel or something else
         * uninteresting
         */
        right_button = MIN (n_buttons, 3);

        /* If we change things we need to make sure we only swap buttons.
         * If we end up with multiple physical buttons assigned to the same
         * logical button the server will complain. This code assumes physical
         * button 0 is the physical left mouse button, and that the physical
         * button other than 0 currently assigned left_button or right_button
         * is the physical right mouse button.
         */

        /* check if the current mapping satisfies the above assumptions */
        if (buttons[left_button - 1] != left_button &&
            buttons[left_button - 1] != right_button)
                /* The current mapping is weird. Swapping buttons is probably not a
                 * good idea.
                 */
                return;

        /* check if we are left_handed and currently not swapped */
        if (left_handed && buttons[left_button - 1] == left_button) {
                /* find the right button */
                for (i = 0; i < n_buttons; i++) {
                        if (buttons[i] == right_button) {
                                buttons[i] = left_button;
                                break;
                        }
                }
                /* swap the buttons */
                buttons[left_button - 1] = right_button;
        }
        /* check if we are not left_handed but are swapped */
        else if (!left_handed && buttons[left_button - 1] == right_button) {
                /* find the right button */
                for (i = 0; i < n_buttons; i++) {
                        if (buttons[i] == left_button) {
                                buttons[i] = right_button;
                                break;
                        }
                }
                /* swap the buttons */
                buttons[left_button - 1] = left_button;
        }
}

static gboolean
xinput_device_has_buttons (GdkDevice *device)
{
        int i;
        XAnyClassInfo *class_info;

        /* FIXME can we use the XDevice's classes here instead? */
        XDeviceInfo *device_info, *info;
        gint n_devices;
        int id;

        /* Find the XDeviceInfo for the GdkDevice */
        g_object_get (G_OBJECT (device), "device-id", &id, NULL);

        device_info = XListInputDevices (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), &n_devices);
        if (device_info == NULL)
                return FALSE;

        info = NULL;
        for (i = 0; i < n_devices; i++) {
                if (device_info[i].id == id) {
                        info = &device_info[i];
                        break;
                }
        }
        if (info == NULL)
                goto bail;

        class_info = info->inputclassinfo;
        for (i = 0; i < info->num_classes; i++) {
                if (class_info->class == ButtonClass) {
                        XButtonInfo *button_info;

                        button_info = (XButtonInfo *) class_info;
                        if (button_info->num_buttons > 0) {
                                XFreeDeviceList (device_info);
                                return TRUE;
                        }
                }

                class_info = (XAnyClassInfo *) (((guchar *) class_info) +
                                                class_info->length);
        }

bail:
        XFreeDeviceList (device_info);

        return FALSE;
}

static gboolean
touchpad_has_single_button (XDevice *device)
{
        Atom type, prop;
        int format;
        unsigned long nitems, bytes_after;
        unsigned char *data;
        gboolean is_single_button = FALSE;
        int rc;

        prop = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Capabilities", False);
        if (!prop)
                return FALSE;

        gdk_error_trap_push ();
        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), device, prop, 0, 1, False,
                                XA_INTEGER, &type, &format, &nitems,
                                &bytes_after, &data);
        if (rc == Success && type == XA_INTEGER && format == 8 && nitems >= 3)
                is_single_button = (data[0] == 1 && data[1] == 0 && data[2] == 0);

        if (rc == Success)
                XFree (data);

        gdk_error_trap_pop_ignored ();

        return is_single_button;
}

static void
set_left_handed (GsdMouseManager *manager,
                 GdkDevice       *device,
                 gboolean mouse_left_handed,
                 gboolean touchpad_left_handed)
{
        XDevice *xdevice;
        guchar *buttons;
        gsize buttons_capacity = 16;
        gboolean left_handed;
        gint n_buttons;

        if (!xinput_device_has_buttons (device))
                return;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

	g_debug ("setting handedness on %s", gdk_device_get_name (device));

        buttons = g_new (guchar, buttons_capacity);

        /* If the device is a touchpad, swap tap buttons
         * around too, otherwise a tap would be a right-click */
        if (device_is_touchpad (xdevice)) {
                gboolean tap = g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TAP_TO_CLICK);
                gboolean single_button = touchpad_has_single_button (xdevice);

                left_handed = touchpad_left_handed;

                if (tap && !single_button)
                        set_tap_to_click (device, tap, left_handed);

                if (single_button)
                        goto out;
        } else {
                left_handed = mouse_left_handed;
        }

        gdk_error_trap_push ();

        n_buttons = XGetDeviceButtonMapping (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                             buttons,
                                             buttons_capacity);

        while (n_buttons > buttons_capacity) {
                buttons_capacity = n_buttons;
                buttons = (guchar *) g_realloc (buttons,
                                                buttons_capacity * sizeof (guchar));

                n_buttons = XGetDeviceButtonMapping (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                                     buttons,
                                                     buttons_capacity);
        }

        configure_button_layout (buttons, n_buttons, left_handed);

        XSetDeviceButtonMapping (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice, buttons, n_buttons);
        gdk_error_trap_pop_ignored ();

out:
        xdevice_close (xdevice);
        g_free (buttons);
}

static void
set_motion (GsdMouseManager *manager,
            GdkDevice       *device)
{
        XDevice *xdevice;
        XPtrFeedbackControl feedback;
        XFeedbackState *states, *state;
        int num_feedbacks;
        int numerator, denominator;
        gfloat motion_acceleration;
        int motion_threshold;
        GSettings *settings;
        guint i;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

	g_debug ("setting motion on %s", gdk_device_get_name (device));

        if (device_is_touchpad (xdevice))
                settings = manager->priv->touchpad_settings;
        else
                settings = manager->priv->mouse_settings;

        /* Calculate acceleration */
        motion_acceleration = g_settings_get_double (settings, KEY_MOTION_ACCELERATION);

        if (motion_acceleration >= 1.0) {
                /* we want to get the acceleration, with a resolution of 0.5
                 */
                if ((motion_acceleration - floor (motion_acceleration)) < 0.25) {
                        numerator = floor (motion_acceleration);
                        denominator = 1;
                } else if ((motion_acceleration - floor (motion_acceleration)) < 0.5) {
                        numerator = ceil (2.0 * motion_acceleration);
                        denominator = 2;
                } else if ((motion_acceleration - floor (motion_acceleration)) < 0.75) {
                        numerator = floor (2.0 *motion_acceleration);
                        denominator = 2;
                } else {
                        numerator = ceil (motion_acceleration);
                        denominator = 1;
                }
        } else if (motion_acceleration < 1.0 && motion_acceleration > 0) {
                /* This we do to 1/10ths */
                numerator = floor (motion_acceleration * 10) + 1;
                denominator= 10;
        } else {
                numerator = -1;
                denominator = -1;
        }

        /* And threshold */
        motion_threshold = g_settings_get_int (settings, KEY_MOTION_THRESHOLD);

        gdk_error_trap_push ();

        /* Get the list of feedbacks for the device */
        states = XGetFeedbackControl (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice, &num_feedbacks);
        if (states == NULL)
                goto out;
        state = (XFeedbackState *) states;
        for (i = 0; i < num_feedbacks; i++) {
                if (state->class == PtrFeedbackClass) {
                        /* And tell the device */
                        feedback.class      = PtrFeedbackClass;
                        feedback.length     = sizeof (XPtrFeedbackControl);
                        feedback.id         = state->id;
                        feedback.threshold  = motion_threshold;
                        feedback.accelNum   = numerator;
                        feedback.accelDenom = denominator;

                        g_debug ("Setting accel %d/%d, threshold %d for device '%s'",
                                 numerator, denominator, motion_threshold, gdk_device_get_name (device));

                        XChangeFeedbackControl (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                                                xdevice,
                                                DvAccelNum | DvAccelDenom | DvThreshold,
                                                (XFeedbackControl *) &feedback);

                        break;
                }
                state = (XFeedbackState *) ((char *) state + state->length);
        }

        if (gdk_error_trap_pop ())
                g_warning ("Error setting acceleration on \"%s\"", gdk_device_get_name (device));

        XFreeFeedbackList (states);

    out:

        xdevice_close (xdevice);
}

static void
set_middle_button (GsdMouseManager *manager,
                   GdkDevice       *device,
                   gboolean         middle_button)
{
        Atom prop;
        XDevice *xdevice;
        Atom type;
        int format;
        unsigned long nitems, bytes_after;
        unsigned char *data;
        int rc;

        prop = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                            "Evdev Middle Button Emulation", True);

        if (!prop) /* no evdev devices */
                return;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

	g_debug ("setting middle button on %s", gdk_device_get_name (device));

        gdk_error_trap_push ();

        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                            xdevice, prop, 0, 1, False, XA_INTEGER, &type, &format,
                            &nitems, &bytes_after, &data);

        if (rc == Success && format == 8 && type == XA_INTEGER && nitems == 1) {
                data[0] = middle_button ? 1 : 0;

                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                                       xdevice, prop, type, format, PropModeReplace, data, nitems);
        }

        if (gdk_error_trap_pop ())
                g_warning ("Error in setting middle button emulation on \"%s\"", gdk_device_get_name (device));

        if (rc == Success)
                XFree (data);

        xdevice_close (xdevice);
}

/* Ensure that syndaemon dies together with us, to avoid running several of
 * them */
static void
setup_syndaemon (gpointer user_data)
{
#ifdef __linux
        prctl (PR_SET_PDEATHSIG, SIGHUP);
#endif
}

static gboolean
have_program_in_path (const char *name)
{
        gchar *path;
        gboolean result;

        path = g_find_program_in_path (name);
        result = (path != NULL);
        g_free (path);
        return result;
}

static void
syndaemon_died (GPid pid, gint status, gpointer user_data)
{
        GsdMouseManager *manager = GSD_MOUSE_MANAGER (user_data);

        g_debug ("syndaemon stopped with status %i", status);
        g_spawn_close_pid (pid);
        manager->priv->syndaemon_spawned = FALSE;
}

static int
set_disable_w_typing (GsdMouseManager *manager, gboolean state)
{
        if (state && touchpad_is_present ()) {
                GError *error = NULL;
                GPtrArray *args;

                if (manager->priv->syndaemon_spawned)
                        return 0;

                if (!have_program_in_path ("syndaemon"))
                        return 0;

                args = g_ptr_array_new ();

                g_ptr_array_add (args, "syndaemon");
                g_ptr_array_add (args, "-i");
                g_ptr_array_add (args, "1.0");
                g_ptr_array_add (args, "-t");
                g_ptr_array_add (args, "-K");
                g_ptr_array_add (args, "-R");
                g_ptr_array_add (args, NULL);

                /* we must use G_SPAWN_DO_NOT_REAP_CHILD to avoid
                 * double-forking, otherwise syndaemon will immediately get
                 * killed again through (PR_SET_PDEATHSIG when the intermediate
                 * process dies */
                g_spawn_async (g_get_home_dir (), (char **) args->pdata, NULL,
                                G_SPAWN_SEARCH_PATH|G_SPAWN_DO_NOT_REAP_CHILD, setup_syndaemon, NULL,
                                &manager->priv->syndaemon_pid, &error);

                manager->priv->syndaemon_spawned = (error == NULL);
                g_ptr_array_free (args, FALSE);

                if (error) {
                        g_warning ("Failed to launch syndaemon: %s", error->message);
                        g_settings_set_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_DISABLE_W_TYPING, FALSE);
                        g_error_free (error);
                } else {
                        g_child_watch_add (manager->priv->syndaemon_pid, syndaemon_died, manager);
                        g_debug ("Launched syndaemon");
                }
        } else if (manager->priv->syndaemon_spawned) {
                kill (manager->priv->syndaemon_pid, SIGHUP);
                g_spawn_close_pid (manager->priv->syndaemon_pid);
                manager->priv->syndaemon_spawned = FALSE;
                g_debug ("Killed syndaemon");
        }

        return 0;
}

static void
set_tap_to_click (GdkDevice *device,
                  gboolean   state,
                  gboolean   left_handed)
{
        int format, rc;
        unsigned long nitems, bytes_after;
        XDevice *xdevice;
        unsigned char* data;
        Atom prop, type;

        prop = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Tap Action", False);
        if (!prop)
                return;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

        if (!device_is_touchpad (xdevice)) {
                xdevice_close (xdevice);
                return;
        }

	g_debug ("setting tap to click on %s", gdk_device_get_name (device));

        gdk_error_trap_push ();
        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice, prop, 0, 2,
                                 False, XA_INTEGER, &type, &format, &nitems,
                                 &bytes_after, &data);

        if (rc == Success && type == XA_INTEGER && format == 8 && nitems >= 7) {
                /* Set RLM mapping for 1/2/3 fingers*/
                data[4] = (state) ? ((left_handed) ? 3 : 1) : 0;
                data[5] = (state) ? ((left_handed) ? 1 : 3) : 0;
                data[6] = (state) ? 2 : 0;
                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice, prop, XA_INTEGER, 8,
                                       PropModeReplace, data, nitems);
        }

        if (rc == Success)
                XFree (data);

        if (gdk_error_trap_pop ())
                g_warning ("Error in setting tap to click on \"%s\"", gdk_device_get_name (device));

        xdevice_close (xdevice);
}

static void
set_horiz_scroll (GdkDevice *device,
                  gboolean   state)
{
        int rc;
        XDevice *xdevice;
        Atom act_type, prop_edge, prop_twofinger;
        int act_format;
        unsigned long nitems, bytes_after;
        unsigned char *data;

        prop_edge = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Edge Scrolling", False);
        prop_twofinger = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Two-Finger Scrolling", False);

        if (!prop_edge || !prop_twofinger)
                return;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

        if (!device_is_touchpad (xdevice)) {
                xdevice_close (xdevice);
                return;
        }

	g_debug ("setting horiz scroll on %s", gdk_device_get_name (device));

        gdk_error_trap_push ();
        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                 prop_edge, 0, 1, False,
                                 XA_INTEGER, &act_type, &act_format, &nitems,
                                 &bytes_after, &data);
        if (rc == Success && act_type == XA_INTEGER &&
            act_format == 8 && nitems >= 2) {
                data[1] = (state && data[0]);
                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                       prop_edge, XA_INTEGER, 8,
                                       PropModeReplace, data, nitems);
        }

        XFree (data);

        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                 prop_twofinger, 0, 1, False,
                                 XA_INTEGER, &act_type, &act_format, &nitems,
                                 &bytes_after, &data);
        if (rc == Success && act_type == XA_INTEGER &&
            act_format == 8 && nitems >= 2) {
                data[1] = (state && data[0]);
                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                       prop_twofinger, XA_INTEGER, 8,
                                       PropModeReplace, data, nitems);
        }

        if (gdk_error_trap_pop ())
                g_warning ("Error in setting horiz scroll on \"%s\"", gdk_device_get_name (device));

        if (rc == Success)
                XFree (data);

        xdevice_close (xdevice);

}

static void
set_scroll_method (GsdMouseManager         *manager,
                   GdkDevice               *device,
                   GsdTouchpadScrollMethod  method)
{
        int rc;
        XDevice *xdevice;
        Atom act_type, prop, prop_edge, prop_twofinger;
        int act_format;
        unsigned long nitems, bytes_after;
        unsigned char *data;

        prop = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Capabilities", True);
        prop_edge = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Edge Scrolling", False);
        prop_twofinger = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), "Synaptics Two-Finger Scrolling", False);

        if (!prop_edge || !prop_twofinger || !prop)
                return;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

        if (!device_is_touchpad (xdevice)) {
                xdevice_close (xdevice);
                return;
        }

	g_debug ("setting edge scroll on %s", gdk_device_get_name (device));

        gdk_error_trap_push ();
        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                 prop, 0, 2, False,
                                 XA_INTEGER, &act_type, &act_format, &nitems,
                                 &bytes_after, &data);
        if (rc == Success && act_type != None) {
                if (!(data[3]) && method == GSD_TOUCHPAD_SCROLL_METHOD_TWO_FINGER_SCROLLING) {
                        g_warning ("Two finger scroll is not supported by %s", gdk_device_get_name (device));
                        method = GSD_TOUCHPAD_SCROLL_METHOD_EDGE_SCROLLING;
                        g_settings_set_enum (manager->priv->touchpad_settings, KEY_SCROLL_METHOD, method);
                }

                XFree (data);
        }

        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                 prop_edge, 0, 1, False,
                                 XA_INTEGER, &act_type, &act_format, &nitems,
                                 &bytes_after, &data);
        if (rc == Success && act_type == XA_INTEGER &&
            act_format == 8 && nitems >= 2) {
                data[0] = (method == GSD_TOUCHPAD_SCROLL_METHOD_EDGE_SCROLLING) ? 1 : 0;
                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                       prop_edge, XA_INTEGER, 8,
                                       PropModeReplace, data, nitems);
        }

        XFree (data);

        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                 prop_twofinger, 0, 1, False,
                                 XA_INTEGER, &act_type, &act_format, &nitems,
                                 &bytes_after, &data);
        if (rc == Success && act_type == XA_INTEGER &&
            act_format == 8 && nitems >= 2) {
                data[0] = (method == GSD_TOUCHPAD_SCROLL_METHOD_TWO_FINGER_SCROLLING) ? 1 : 0;
                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                       prop_twofinger, XA_INTEGER, 8,
                                       PropModeReplace, data, nitems);
        }

        if (gdk_error_trap_pop ())
                g_warning ("Error in setting edge scroll on \"%s\"", gdk_device_get_name (device));

        if (rc == Success)
                XFree (data);

        xdevice_close (xdevice);
}

static void
set_touchpad_disabled (GdkDevice *device)
{
        int id;
        XDevice *xdevice;

        g_object_get (G_OBJECT (device), "device-id", &id, NULL);

        g_debug ("Trying to set device disabled for \"%s\" (%d)", gdk_device_get_name (device), id);

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

        if (!device_is_touchpad (xdevice)) {
                xdevice_close (xdevice);
                return;
        }

        if (set_device_enabled (id, FALSE) == FALSE)
                g_warning ("Error disabling device \"%s\" (%d)", gdk_device_get_name (device), id);
        else
                g_debug ("Disabled device \"%s\" (%d)", gdk_device_get_name (device), id);

        xdevice_close (xdevice);
}

static void
set_touchpad_enabled (int id)
{
        XDevice *xdevice;

        g_debug ("Trying to set device enabled for %d", id);

        gdk_error_trap_push ();
        xdevice = XOpenDevice (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), id);
        if (gdk_error_trap_pop () != 0)
                return;

        if (!device_is_touchpad (xdevice)) {
                xdevice_close (xdevice);
                return;
        }

        if (set_device_enabled (id, TRUE) == FALSE)
                g_warning ("Error enabling device \"%d\"", id);
        else
                g_debug ("Enabled device %d", id);

        xdevice_close (xdevice);
}

static void
set_locate_pointer (GsdMouseManager *manager,
                    gboolean         state)
{
        if (state) {
                GError *error = NULL;
                char *args[2];

                if (manager->priv->locate_pointer_spawned)
                        return;

                args[0] = LIBEXECDIR "/gsd-locate-pointer";
                args[1] = NULL;

                g_spawn_async (NULL, args, NULL,
                               0, NULL, NULL,
                               &manager->priv->locate_pointer_pid, &error);

                manager->priv->locate_pointer_spawned = (error == NULL);

                if (error) {
                        g_settings_set_boolean (manager->priv->mouse_settings, KEY_LOCATE_POINTER, FALSE);
                        g_error_free (error);
                }

        } else if (manager->priv->locate_pointer_spawned) {
                kill (manager->priv->locate_pointer_pid, SIGHUP);
                g_spawn_close_pid (manager->priv->locate_pointer_pid);
                manager->priv->locate_pointer_spawned = FALSE;
        }
}

static void
set_mousetweaks_daemon (GsdMouseManager *manager,
                        gboolean         dwell_click_enabled,
                        gboolean         secondary_click_enabled)
{
        GError *error = NULL;
        gchar *comm;
        gboolean run_daemon = dwell_click_enabled || secondary_click_enabled;

        if (run_daemon || manager->priv->mousetweaks_daemon_running)
                comm = g_strdup_printf ("mousetweaks %s",
                                        run_daemon ? "" : "-s");
        else
                return;

        if (run_daemon)
                manager->priv->mousetweaks_daemon_running = TRUE;

        if (! g_spawn_command_line_async (comm, &error)) {
                if (error->code == G_SPAWN_ERROR_NOENT && run_daemon) {
                        if (dwell_click_enabled) {
                                g_settings_set_boolean (manager->priv->mouse_a11y_settings,
                                                        KEY_DWELL_CLICK_ENABLED, FALSE);
                        } else if (secondary_click_enabled) {
                                g_settings_set_boolean (manager->priv->mouse_a11y_settings,
                                                        KEY_SECONDARY_CLICK_ENABLED, FALSE);
                        }

                        g_warning ("Error enabling mouse accessibility features (mousetweaks is not installed)");
                }
                g_error_free (error);
        }
        g_free (comm);
}

static gboolean
get_touchpad_handedness (GsdMouseManager *manager, gboolean mouse_left_handed)
{
        switch (g_settings_get_enum (manager->priv->touchpad_settings, KEY_LEFT_HANDED)) {
        case GSD_TOUCHPAD_HANDEDNESS_RIGHT:
                return FALSE;
        case GSD_TOUCHPAD_HANDEDNESS_LEFT:
                return TRUE;
        case GSD_TOUCHPAD_HANDEDNESS_MOUSE:
                return mouse_left_handed;
        default:
                g_assert_not_reached ();
        }
}

static void
set_mouse_settings (GsdMouseManager *manager,
                    GdkDevice       *device)
{
        gboolean mouse_left_handed, touchpad_left_handed;

        mouse_left_handed = g_settings_get_boolean (manager->priv->mouse_settings, KEY_LEFT_HANDED);
        touchpad_left_handed = get_touchpad_handedness (manager, mouse_left_handed);
        set_left_handed (manager, device, mouse_left_handed, touchpad_left_handed);

        set_motion (manager, device);
        set_middle_button (manager, device, g_settings_get_boolean (manager->priv->mouse_settings, KEY_MIDDLE_BUTTON_EMULATION));

        set_tap_to_click (device, g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TAP_TO_CLICK), touchpad_left_handed);
        set_scroll_method (manager, device, g_settings_get_enum (manager->priv->touchpad_settings, KEY_SCROLL_METHOD));
        set_horiz_scroll (device, g_settings_get_boolean (manager->priv->touchpad_settings, KEY_PAD_HORIZ_SCROLL));
        set_natural_scroll (manager, device, g_settings_get_boolean (manager->priv->touchpad_settings, KEY_NATURAL_SCROLL_ENABLED));
        if (g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_ENABLED) == FALSE)
                set_touchpad_disabled (device);
}

static void
set_natural_scroll (GsdMouseManager *manager,
                    GdkDevice       *device,
                    gboolean         natural_scroll)
{
        XDevice *xdevice;
        Atom scrolling_distance, act_type;
        int rc, act_format;
        unsigned long nitems, bytes_after;
        unsigned char *data;
        glong *ptr;

        xdevice = open_gdk_device (device);
        if (xdevice == NULL)
                return;

        if (!device_is_touchpad (xdevice)) {
                xdevice_close (xdevice);
                return;
        }

        g_debug ("Trying to set %s for \"%s\"",
                 natural_scroll ? "natural (reverse) scroll" : "normal scroll",
                 gdk_device_get_name (device));

        scrolling_distance = XInternAtom (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()),
                                          "Synaptics Scrolling Distance", False);

        gdk_error_trap_push ();
        rc = XGetDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                 scrolling_distance, 0, 2, False,
                                 XA_INTEGER, &act_type, &act_format, &nitems,
                                 &bytes_after, &data);

        if (rc == Success && act_type == XA_INTEGER && act_format == 32 && nitems >= 2) {
                ptr = (glong *) data;

                if (natural_scroll) {
                        ptr[0] = -abs(ptr[0]);
                        ptr[1] = -abs(ptr[1]);
                } else {
                        ptr[0] = abs(ptr[0]);
                        ptr[1] = abs(ptr[1]);
                }

                XChangeDeviceProperty (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdevice,
                                       scrolling_distance, XA_INTEGER, act_format,
                                       PropModeReplace, data, nitems);
        }

        if (gdk_error_trap_pop ())
                g_warning ("Error setting %s for \"%s\"",
                           natural_scroll ? "natural (reverse) scroll" : "normal scroll",
                           gdk_device_get_name (device));

        if (rc == Success)
                XFree (data);

        xdevice_close (xdevice);
}

static void
mouse_callback (GSettings       *settings,
                const gchar     *key,
                GsdMouseManager *manager)
{
        GList *devices, *l;

        if (g_str_equal (key, KEY_DWELL_CLICK_ENABLED) ||
            g_str_equal (key, KEY_SECONDARY_CLICK_ENABLED)) {
                set_mousetweaks_daemon (manager,
                                        g_settings_get_boolean (settings, KEY_DWELL_CLICK_ENABLED),
                                        g_settings_get_boolean (settings, KEY_SECONDARY_CLICK_ENABLED));
                return;
        } else if (g_str_equal (key, KEY_LOCATE_POINTER)) {
                set_locate_pointer (manager, g_settings_get_boolean (settings, KEY_LOCATE_POINTER));
                return;
        }

        devices = gdk_device_manager_list_devices (manager->priv->device_manager, GDK_DEVICE_TYPE_SLAVE);

        for (l = devices; l != NULL; l = l->next) {
                GdkDevice *device = l->data;

                if (device_is_ignored (manager, device))
                        continue;

                if (g_str_equal (key, KEY_LEFT_HANDED)) {
                        gboolean mouse_left_handed;
                        mouse_left_handed = g_settings_get_boolean (settings, KEY_LEFT_HANDED);
                        set_left_handed (manager, device, mouse_left_handed, get_touchpad_handedness (manager, mouse_left_handed));
                } else if (g_str_equal (key, KEY_MOTION_ACCELERATION) ||
                           g_str_equal (key, KEY_MOTION_THRESHOLD)) {
                        set_motion (manager, device);
                } else if (g_str_equal (key, KEY_MIDDLE_BUTTON_EMULATION)) {
                        set_middle_button (manager, device, g_settings_get_boolean (settings, KEY_MIDDLE_BUTTON_EMULATION));
                }
        }
        g_list_free (devices);
}

static void
touchpad_callback (GSettings       *settings,
                   const gchar     *key,
                   GsdMouseManager *manager)
{
        GList *devices, *l;

        if (g_str_equal (key, KEY_TOUCHPAD_DISABLE_W_TYPING)) {
                set_disable_w_typing (manager, g_settings_get_boolean (manager->priv->touchpad_settings, key));
                return;
        }

        devices = gdk_device_manager_list_devices (manager->priv->device_manager, GDK_DEVICE_TYPE_SLAVE);

        for (l = devices; l != NULL; l = l->next) {
                GdkDevice *device = l->data;

                if (device_is_ignored (manager, device))
                        continue;

                if (g_str_equal (key, KEY_TAP_TO_CLICK)) {
                        gboolean mouse_left_handed;
                        mouse_left_handed = g_settings_get_boolean (manager->priv->mouse_settings, KEY_LEFT_HANDED);
                        set_tap_to_click (device, g_settings_get_boolean (settings, key),
                                          get_touchpad_handedness (manager, mouse_left_handed));
                } else if (g_str_equal (key, KEY_SCROLL_METHOD)) {
                        set_scroll_method (manager, device, g_settings_get_enum (settings, key));
                        set_horiz_scroll (device, g_settings_get_boolean (settings, KEY_PAD_HORIZ_SCROLL));
                } else if (g_str_equal (key, KEY_PAD_HORIZ_SCROLL)) {
                        set_horiz_scroll (device, g_settings_get_boolean (settings, key));
                } else if (g_str_equal (key, KEY_TOUCHPAD_ENABLED)) {
                        if (g_settings_get_boolean (settings, key) == FALSE)
                                set_touchpad_disabled (device);
                        else
                                set_touchpad_enabled (gdk_x11_device_get_id (device));
                } else if (g_str_equal (key, KEY_MOTION_ACCELERATION) ||
                           g_str_equal (key, KEY_MOTION_THRESHOLD)) {
                        set_motion (manager, device);
                } else if (g_str_equal (key, KEY_LEFT_HANDED)) {
                        gboolean mouse_left_handed;
                        mouse_left_handed = g_settings_get_boolean (manager->priv->mouse_settings, KEY_LEFT_HANDED);
                        set_left_handed (manager, device, mouse_left_handed, get_touchpad_handedness (manager, mouse_left_handed));
                } else if (g_str_equal (key, KEY_NATURAL_SCROLL_ENABLED)) {
                        set_natural_scroll (manager, device, g_settings_get_boolean (settings, key));
                }
        }
        g_list_free (devices);

        if (g_str_equal (key, KEY_TOUCHPAD_ENABLED) &&
            g_settings_get_boolean (settings, key)) {
                devices = get_disabled_devices (manager->priv->device_manager);
                for (l = devices; l != NULL; l = l->next) {
                        int device_id;

                        device_id = GPOINTER_TO_INT (l->data);
                        set_touchpad_enabled (device_id);
                }
                g_list_free (devices);
        }
}

/* Re-enable touchpad when any other pointing device isn't present. */
static void
ensure_touchpad_active (GsdMouseManager *manager)
{
        if (mouse_is_present () == FALSE && touchscreen_is_present () == FALSE && trackball_is_present () == FALSE && touchpad_is_present ())
                g_settings_set_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_ENABLED, TRUE);
}

static void
device_added_cb (GdkDeviceManager *device_manager,
                 GdkDevice        *device,
                 GsdMouseManager  *manager)
{
        if (device_is_ignored (manager, device) == FALSE) {
                if (run_custom_command (device, COMMAND_DEVICE_ADDED) == FALSE) {
                        set_mouse_settings (manager, device);
                } else {
                        int id;
                        g_object_get (G_OBJECT (device), "device-id", &id, NULL);
                        g_hash_table_insert (manager->priv->blacklist,
                                             GINT_TO_POINTER (id), GINT_TO_POINTER (1));
                }

                /* If a touchpad was to appear... */
                set_disable_w_typing (manager, g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_DISABLE_W_TYPING));
        }
}

static void
device_removed_cb (GdkDeviceManager *device_manager,
                   GdkDevice        *device,
                   GsdMouseManager  *manager)
{
	int id;

	/* Remove the device from the hash table so that
	 * device_is_ignored () doesn't check for blacklisted devices */
	g_object_get (G_OBJECT (device), "device-id", &id, NULL);
	g_hash_table_remove (manager->priv->blacklist,
			     GINT_TO_POINTER (id));

        if (device_is_ignored (manager, device) == FALSE) {
                run_custom_command (device, COMMAND_DEVICE_REMOVED);

                /* If a touchpad was to disappear... */
                set_disable_w_typing (manager, g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_DISABLE_W_TYPING));

                ensure_touchpad_active (manager);
        }
}

static void
set_devicepresence_handler (GsdMouseManager *manager)
{
        GdkDeviceManager *device_manager;

        device_manager = gdk_display_get_device_manager (gdk_display_get_default ());

        manager->priv->device_added_id = g_signal_connect (G_OBJECT (device_manager), "device-added",
                                                           G_CALLBACK (device_added_cb), manager);
        manager->priv->device_removed_id = g_signal_connect (G_OBJECT (device_manager), "device-removed",
                                                             G_CALLBACK (device_removed_cb), manager);
        manager->priv->device_manager = device_manager;
}

static void
gsd_mouse_manager_init (GsdMouseManager *manager)
{
        manager->priv = GSD_MOUSE_MANAGER_GET_PRIVATE (manager);
        manager->priv->blacklist = g_hash_table_new (g_direct_hash, g_direct_equal);
}

static gboolean
gsd_mouse_manager_idle_cb (GsdMouseManager *manager)
{
        GList *devices, *l;

        gnome_settings_profile_start (NULL);

        set_devicepresence_handler (manager);

        manager->priv->mouse_settings = g_settings_new (SETTINGS_MOUSE_DIR);
        g_signal_connect (manager->priv->mouse_settings, "changed",
                          G_CALLBACK (mouse_callback), manager);

        manager->priv->mouse_a11y_settings = g_settings_new ("org.gnome.desktop.a11y.mouse");
        g_signal_connect (manager->priv->mouse_a11y_settings, "changed",
                          G_CALLBACK (mouse_callback), manager);

        manager->priv->touchpad_settings = g_settings_new (SETTINGS_TOUCHPAD_DIR);
        g_signal_connect (manager->priv->touchpad_settings, "changed",
                          G_CALLBACK (touchpad_callback), manager);

        manager->priv->syndaemon_spawned = FALSE;

        set_locate_pointer (manager, g_settings_get_boolean (manager->priv->mouse_settings, KEY_LOCATE_POINTER));
        set_mousetweaks_daemon (manager,
                                g_settings_get_boolean (manager->priv->mouse_a11y_settings, KEY_DWELL_CLICK_ENABLED),
                                g_settings_get_boolean (manager->priv->mouse_a11y_settings, KEY_SECONDARY_CLICK_ENABLED));
        set_disable_w_typing (manager, g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_DISABLE_W_TYPING));

        devices = gdk_device_manager_list_devices (manager->priv->device_manager, GDK_DEVICE_TYPE_SLAVE);
        for (l = devices; l != NULL; l = l->next) {
                GdkDevice *device = l->data;

                if (device_is_ignored (manager, device))
                        continue;

                if (run_custom_command (device, COMMAND_DEVICE_PRESENT) == FALSE) {
                        set_mouse_settings (manager, device);
                } else {
                        int id;
                        g_object_get (G_OBJECT (device), "device-id", &id, NULL);
                        g_hash_table_insert (manager->priv->blacklist,
                                             GINT_TO_POINTER (id), GINT_TO_POINTER (1));
                }
        }
        g_list_free (devices);

        ensure_touchpad_active (manager);

        if (g_settings_get_boolean (manager->priv->touchpad_settings, KEY_TOUCHPAD_ENABLED)) {
                devices = get_disabled_devices (manager->priv->device_manager);
                for (l = devices; l != NULL; l = l->next) {
                        int device_id;

                        device_id = GPOINTER_TO_INT (l->data);
                        set_touchpad_enabled (device_id);
                }
                g_list_free (devices);
        }

        gnome_settings_profile_end (NULL);

        manager->priv->start_idle_id = 0;

        return FALSE;
}

gboolean
gsd_mouse_manager_start (GsdMouseManager *manager,
                         GError         **error)
{
        gnome_settings_profile_start (NULL);

        if (!supports_xinput_devices ()) {
                g_debug ("XInput is not supported, not applying any settings");
                return TRUE;
        }

        manager->priv->start_idle_id = g_idle_add ((GSourceFunc) gsd_mouse_manager_idle_cb, manager);
        g_source_set_name_by_id (manager->priv->start_idle_id, "[gnome-settings-daemon] gsd_mouse_manager_idle_cb");

        gnome_settings_profile_end (NULL);

        return TRUE;
}

void
gsd_mouse_manager_stop (GsdMouseManager *manager)
{
        GsdMouseManagerPrivate *p = manager->priv;

        g_debug ("Stopping mouse manager");

        if (manager->priv->start_idle_id != 0) {
                g_source_remove (manager->priv->start_idle_id);
                manager->priv->start_idle_id = 0;
        }

        if (p->device_manager != NULL) {
                g_signal_handler_disconnect (p->device_manager, p->device_added_id);
                g_signal_handler_disconnect (p->device_manager, p->device_removed_id);
                p->device_manager = NULL;
        }

        g_clear_object (&p->mouse_a11y_settings);
        g_clear_object (&p->mouse_settings);
        g_clear_object (&p->touchpad_settings);

        set_locate_pointer (manager, FALSE);
}

static void
gsd_mouse_manager_finalize (GObject *object)
{
        GsdMouseManager *mouse_manager;

        g_return_if_fail (object != NULL);
        g_return_if_fail (GSD_IS_MOUSE_MANAGER (object));

        mouse_manager = GSD_MOUSE_MANAGER (object);

        g_return_if_fail (mouse_manager->priv != NULL);

        gsd_mouse_manager_stop (mouse_manager);

        if (mouse_manager->priv->blacklist != NULL)
                g_hash_table_destroy (mouse_manager->priv->blacklist);

        G_OBJECT_CLASS (gsd_mouse_manager_parent_class)->finalize (object);
}

GsdMouseManager *
gsd_mouse_manager_new (void)
{
        if (manager_object != NULL) {
                g_object_ref (manager_object);
        } else {
                manager_object = g_object_new (GSD_TYPE_MOUSE_MANAGER, NULL);
                g_object_add_weak_pointer (manager_object,
                                           (gpointer *) &manager_object);
        }

        return GSD_MOUSE_MANAGER (manager_object);
}
