/*
 * Copyright © 2009, 2010, 2011  Intel Corp.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Carlos Garnacho <carlosg@gnome.org>
 */

#include "config.h"

#include "backends/native/meta-input-thread.h"

G_DEFINE_TYPE (MetaInputDeviceToolNative, meta_input_device_tool_native,
               CLUTTER_TYPE_INPUT_DEVICE_TOOL)

static void
meta_input_device_tool_native_finalize (GObject *object)
{
  MetaInputDeviceToolNative *tool = META_INPUT_DEVICE_TOOL_NATIVE (object);

  g_hash_table_unref (tool->button_map);
  libinput_tablet_tool_unref (tool->tool);

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

static void
meta_input_device_tool_native_class_init (MetaInputDeviceToolNativeClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->finalize = meta_input_device_tool_native_finalize;
}

static void
meta_input_device_tool_native_init (MetaInputDeviceToolNative *tool)
{
  tool->button_map = g_hash_table_new (NULL, NULL);
}

static ClutterInputAxisFlags
translate_axes (struct libinput_tablet_tool *tool)
{
  ClutterInputAxisFlags axes = 0;

  if (libinput_tablet_tool_has_pressure (tool))
    axes |= CLUTTER_INPUT_AXIS_FLAG_PRESSURE;
  if (libinput_tablet_tool_has_distance (tool))
    axes |= CLUTTER_INPUT_AXIS_FLAG_DISTANCE;
  if (libinput_tablet_tool_has_rotation (tool))
    axes |= CLUTTER_INPUT_AXIS_FLAG_ROTATION;
  if (libinput_tablet_tool_has_slider (tool))
    axes |= CLUTTER_INPUT_AXIS_FLAG_SLIDER;
  if (libinput_tablet_tool_has_wheel (tool))
    axes |= CLUTTER_INPUT_AXIS_FLAG_WHEEL;
  if (libinput_tablet_tool_has_tilt (tool))
    axes |= CLUTTER_INPUT_AXIS_FLAG_XTILT | CLUTTER_INPUT_AXIS_FLAG_YTILT;

  return axes;
}

ClutterInputDeviceTool *
meta_input_device_tool_native_new (struct libinput_tablet_tool *tool,
                                   uint64_t                     serial,
                                   ClutterInputDeviceToolType   type)
{
  MetaInputDeviceToolNative *evdev_tool;

  evdev_tool = g_object_new (META_TYPE_INPUT_DEVICE_TOOL_NATIVE,
                             "type", type,
                             "serial", serial,
                             "id", libinput_tablet_tool_get_tool_id (tool),
                             "axes", translate_axes (tool),
                             NULL);

  evdev_tool->tool = libinput_tablet_tool_ref (tool);

  return CLUTTER_INPUT_DEVICE_TOOL (evdev_tool);
}

void
meta_input_device_tool_native_set_pressure_curve_in_impl (ClutterInputDeviceTool *tool,
                                                          double                  curve[4])
{
  MetaInputDeviceToolNative *evdev_tool;

  g_return_if_fail (META_IS_INPUT_DEVICE_TOOL_NATIVE (tool));
  g_return_if_fail (curve[0] >= 0 && curve[0] <= 1 &&
                    curve[1] >= 0 && curve[1] <= 1 &&
                    curve[2] >= 0 && curve[2] <= 1 &&
                    curve[3] >= 0 && curve[3] <= 1);

  evdev_tool = META_INPUT_DEVICE_TOOL_NATIVE (tool);
  evdev_tool->pressure_curve[0] = curve[0];
  evdev_tool->pressure_curve[1] = curve[1];
  evdev_tool->pressure_curve[2] = curve[2];
  evdev_tool->pressure_curve[3] = curve[3];
}

void
meta_input_device_tool_native_set_button_code_in_impl (ClutterInputDeviceTool *tool,
                                                       uint32_t                button,
                                                       uint32_t                evcode)
{
  MetaInputDeviceToolNative *evdev_tool;

  g_return_if_fail (META_IS_INPUT_DEVICE_TOOL_NATIVE (tool));

  evdev_tool = META_INPUT_DEVICE_TOOL_NATIVE (tool);

  if (evcode == 0)
    {
      g_hash_table_remove (evdev_tool->button_map, GUINT_TO_POINTER (button));
    }
  else
    {
      g_hash_table_insert (evdev_tool->button_map, GUINT_TO_POINTER (button),
                           GUINT_TO_POINTER (evcode));
    }
}

static double
calculate_bezier_position (double pos,
                           double x1,
                           double y1,
                           double x2,
                           double y2)
{
  double int1_y, int2_y;

  pos = CLAMP (pos, 0, 1);

  /* Intersection between 0,0 and x1,y1 */
  int1_y = pos * y1;

  /* Intersection between x2,y2 and 1,1 */
  int2_y = (pos * (1 - y2)) + y2;

  /* Find the new position in the line traced by the previous points */
  return (pos * (int2_y - int1_y)) + int1_y;
}

double
meta_input_device_tool_native_translate_pressure_in_impl (ClutterInputDeviceTool *tool,
                                                          double                  pressure)
{
  MetaInputDeviceToolNative *evdev_tool;

  g_return_val_if_fail (META_IS_INPUT_DEVICE_TOOL_NATIVE (tool), pressure);

  evdev_tool = META_INPUT_DEVICE_TOOL_NATIVE (tool);

  return calculate_bezier_position (CLAMP (pressure, 0, 1),
                                    evdev_tool->pressure_curve[0],
                                    evdev_tool->pressure_curve[1],
                                    evdev_tool->pressure_curve[2],
                                    evdev_tool->pressure_curve[3]);
}

uint32_t
meta_input_device_tool_native_get_button_code_in_impl (ClutterInputDeviceTool *tool,
                                                       uint32_t                button)
{
  MetaInputDeviceToolNative *evdev_tool;

  g_return_val_if_fail (META_IS_INPUT_DEVICE_TOOL_NATIVE (tool), 0);

  evdev_tool = META_INPUT_DEVICE_TOOL_NATIVE (tool);

  return GPOINTER_TO_UINT (g_hash_table_lookup (evdev_tool->button_map,
                                                GUINT_TO_POINTER (button)));
}