/*
 * Copyright (C) 2018 Purism SPC
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 * Author: Guido Günther <agx@sigxcpu.org>
 */
#define G_LOG_DOMAIN "phosh-monitor"

#include "gamma-table.h"
#include "monitor.h"
#include "shell-priv.h"

#include "util.h"

#include <glib/gstdio.h>

#include <sys/mman.h>
#include <errno.h>

#include <gdk/gdkwayland.h>

/**
 * PhoshMonitor:
 *
 * A monitor
 *
 * A rectangualar area in the compositor space, usually corresponds to
 * physical monitor using wl_output and xdg_output Wayland protocols.
 */

enum {
  PHOSH_MONITOR_PROP_0,
  PHOSH_MONITOR_PROP_WL_OUTPUT,
  PHOSH_MONITOR_PROP_POWER_MODE,
  PHOSH_MONITOR_PROP_N_GAMMA_ENTRIES,
  PHOSH_MONITOR_PROP_LAST_PROP,
};
static GParamSpec *props[PHOSH_MONITOR_PROP_LAST_PROP];

enum {
  SIGNAL_CONFIGURED,
  N_SIGNALS
};
static guint signals[N_SIGNALS] = { 0 };

G_DEFINE_TYPE (PhoshMonitor, phosh_monitor, G_TYPE_OBJECT)


static void
output_handle_geometry (void             *data,
                        struct wl_output *wl_output,
                        int               x,
                        int               y,
                        int               physical_width,
                        int               physical_height,
                        int               subpixel,
                        const char       *make,
                        const char       *model,
                        int32_t           transform)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  g_debug ("handle geometry output %p, position %d %d, size %dx%d, subpixel layout %d, "
           "transform %d",
           self, x, y, physical_width, physical_height, subpixel, transform);

  self->wl_output_done = FALSE;
  self->x = x;
  self->y = y;
  self->width_mm = physical_width;
  self->height_mm = physical_height;
  self->subpixel = subpixel;
  self->transform = transform;
}


static void
output_handle_done (void             *data,
                    struct wl_output *wl_output)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);
  g_autoptr (GError) err = NULL;

  if (phosh_monitor_is_configured (self))
    return;

  self->wl_output_done = TRUE;

  if (!self->backlight && self->name) {
    self->backlight = PHOSH_BACKLIGHT (phosh_backlight_sysfs_new (self->name, &err));
    if (!self->backlight)
      g_debug ("Failed to get backlight for %s: %s", self->name, err->message);
  }

  g_signal_emit (self, signals[SIGNAL_CONFIGURED], 0);
}


static void
output_handle_scale (void             *data,
                     struct wl_output *wl_output,
                     int32_t           scale)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  /* nothing to do */
  self->wl_output_done = FALSE;
}


static void
output_handle_mode (void             *data,
                    struct wl_output *wl_output,
                    uint32_t          flags,
                    int               width,
                    int               height,
                    int               refresh)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);
  PhoshMonitorMode mode;

  g_debug ("handle mode output %p: %dx%d@%d",
           self, width, height, refresh);
  self->wl_output_done = FALSE;

  mode.width = width;
  mode.height = height;
  mode.flags = flags;
  mode.refresh = refresh;

  g_array_append_val (self->modes, mode);

  if (width > self->width)
    self->width = width;

  if (height > self->height)
    self->height = height;

  if (flags & WL_OUTPUT_MODE_CURRENT)
    self->current_mode = self->modes->len - 1;

  if (flags & WL_OUTPUT_MODE_PREFERRED)
    self->preferred_mode = self->modes->len - 1;
}


static const struct wl_output_listener output_listener =
{
  output_handle_geometry,
  output_handle_mode,
  output_handle_done,
  output_handle_scale,
};


static void
xdg_output_v1_handle_logical_position (void *data,
                                       struct zxdg_output_v1 *zxdg_output_v1,
                                       int32_t x,
                                       int32_t y)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  g_return_if_fail (PHOSH_IS_MONITOR (self));
  self->wl_output_done = FALSE;
  g_debug ("Monitor %p: Logical pos: %d,%d", self, x, y);
  self->logical.x = x;
  self->logical.y = y;
}


static void
xdg_output_v1_handle_logical_size (void *data,
                                   struct zxdg_output_v1 *zxdg_output_v1,
                                   int32_t width,
                                   int32_t height)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  g_return_if_fail (PHOSH_IS_MONITOR (self));
  self->wl_output_done = FALSE;
  g_debug ("Monitor %p: Logical size: %dx%d", self, width, height);
  self->logical.width = width;
  self->logical.height = height;
}


static void
xdg_output_v1_handle_done (void *data,
                           struct zxdg_output_v1 *zxdg_output_v1)
{
  /* Nothing to be done */
}


static void
xdg_output_v1_handle_name (void *data,
                           struct zxdg_output_v1 *zxdg_output_v1,
                           const char *name)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);
  /* wlroots uses the connector's name as xdg_output name */
  g_debug("Monitor %p: Connector name is %s", self, name);

  self->wl_output_done = FALSE;
  self->name = g_strdup (name);

  /* wlroots uses the connector's name as output name so
     try to derive the connector type from it */
  self->conn_type = phosh_monitor_connector_type_from_name (name);
}


static void
xdg_output_v1_handle_description(void *data,
                                 struct zxdg_output_v1 *zxdg_output_v1,
                                 const char *description)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);
  g_debug("Output description is %s", description);
  self->description = g_strdup (description);
}


static const struct zxdg_output_v1_listener xdg_output_v1_listener =
{
  xdg_output_v1_handle_logical_position,
  xdg_output_v1_handle_logical_size,
  xdg_output_v1_handle_done,
  xdg_output_v1_handle_name,
  xdg_output_v1_handle_description,
};


static void
wlr_output_power_handle_mode(void *data,
                             struct zwlr_output_power_v1 *output_power,
                             enum zwlr_output_power_v1_mode mode)
{
  PhoshMonitor *self = data;
  PhoshMonitorPowerSaveMode m;

  g_return_if_fail (PHOSH_IS_MONITOR (self));

  switch (mode) {
  case ZWLR_OUTPUT_POWER_V1_MODE_OFF:
    g_debug ("Monitor %s disabled", self->name);
    m = PHOSH_MONITOR_POWER_SAVE_MODE_OFF;
    break;
  case ZWLR_OUTPUT_POWER_V1_MODE_ON:
    g_debug ("Monitor %s enabled", self->name);
    m = PHOSH_MONITOR_POWER_SAVE_MODE_ON;
    break;
  default:
    g_return_if_reached ();
  }

  self->power_mode = m;
  g_object_notify_by_pspec (G_OBJECT (self), props[PHOSH_MONITOR_PROP_POWER_MODE]);
}


static void
wlr_output_power_handle_failed(void *data,
                               struct zwlr_output_power_v1 *output_power)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  g_return_if_fail (PHOSH_IS_MONITOR (self));
  g_warning("Failed to set output power mode for %s\n", self->name);
}


static const struct zwlr_output_power_v1_listener wlr_output_power_listener_v1 = {
	.mode = wlr_output_power_handle_mode,
	.failed = wlr_output_power_handle_failed,
};


static void
handle_wl_gamma_size (void *data, struct zwlr_gamma_control_v1 *gamma_control, uint32_t size)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  self->n_gamma_entries = size;
  g_object_notify_by_pspec (G_OBJECT (self), props[PHOSH_MONITOR_PROP_N_GAMMA_ENTRIES]);
}


static void handle_wl_gamma_failed (void *data, struct zwlr_gamma_control_v1 *gamma_control)
{
  PhoshMonitor *self = PHOSH_MONITOR (data);

  /* Only warn if we ever saw a non-0 gamma table so avoid warnings with e.g. headless backend */
  if (self->n_gamma_entries)
    g_warning ("wl_gamma failed for %s", self->name);
  g_clear_pointer (&self->gamma_control, zwlr_gamma_control_v1_destroy);
}


static const struct
zwlr_gamma_control_v1_listener gamma_control_listener = {
  .gamma_size = handle_wl_gamma_size,
  .failed = handle_wl_gamma_failed,
};


static void
phosh_monitor_set_property (GObject *object,
                            guint property_id,
                            const GValue *value,
                            GParamSpec *pspec)
{
  PhoshMonitor *self = PHOSH_MONITOR (object);

  switch (property_id) {
  case PHOSH_MONITOR_PROP_WL_OUTPUT:
    self->wl_output = g_value_get_pointer (value);
    break;
  default:
    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
    break;
  }
}


static void
phosh_monitor_get_property (GObject *object,
                          guint property_id,
                          GValue *value,
                          GParamSpec *pspec)
{
  PhoshMonitor *self = PHOSH_MONITOR (object);

  switch (property_id) {
  case PHOSH_MONITOR_PROP_WL_OUTPUT:
    g_value_set_pointer (value, self->wl_output);
    break;
  case PHOSH_MONITOR_PROP_POWER_MODE:
    g_value_set_enum (value, self->power_mode);
    break;
  case PHOSH_MONITOR_PROP_N_GAMMA_ENTRIES:
    g_value_set_uint (value, self->n_gamma_entries);
    break;
  default:
    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
    break;
  }
}


static void
phosh_monitor_dispose (GObject *object)
{
  PhoshMonitor *self = PHOSH_MONITOR (object);

  g_clear_pointer (&self->xdg_output, zxdg_output_v1_destroy);
  g_clear_pointer (&self->wlr_output_power, zwlr_output_power_v1_destroy);
  g_clear_pointer (&self->gamma_control, zwlr_gamma_control_v1_destroy);

  g_clear_object (&self->backlight);

  G_OBJECT_CLASS (phosh_monitor_parent_class)->dispose (object);
}


static void
phosh_monitor_finalize (GObject *object)
{
  PhoshMonitor *self = PHOSH_MONITOR (object);

  g_array_free (self->modes, TRUE);
  self->modes = NULL;

  g_clear_pointer (&self->description, g_free);
  g_clear_pointer (&self->name, g_free);

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


static void
phosh_monitor_constructed (GObject *object)
{
  PhoshMonitor *self = PHOSH_MONITOR (object);
  struct zwlr_output_power_manager_v1 *zwlr_output_power_manager_v1;
  g_autoptr (GError) err = NULL;

  wl_output_add_listener (self->wl_output, &output_listener, self);

  self->xdg_output =
    zxdg_output_manager_v1_get_xdg_output(phosh_wayland_get_zxdg_output_manager_v1(phosh_wayland_get_default()),
                                          self->wl_output);
  g_return_if_fail (self->xdg_output);
  zxdg_output_v1_add_listener (self->xdg_output, &xdg_output_v1_listener, self);

  zwlr_output_power_manager_v1 = phosh_wayland_get_zwlr_output_power_manager_v1 (phosh_wayland_get_default ());
  self->wlr_output_power = zwlr_output_power_manager_v1_get_output_power (zwlr_output_power_manager_v1,
                                                                          self->wl_output);
  g_return_if_fail (self->wlr_output_power);
  zwlr_output_power_v1_add_listener(self->wlr_output_power, &wlr_output_power_listener_v1, self);

  self->gamma_control = zwlr_gamma_control_manager_v1_get_gamma_control (
    phosh_wayland_get_zwlr_gamma_control_manager_v1 (phosh_wayland_get_default ()),
    self->wl_output);
  g_return_if_fail (self->gamma_control);
  zwlr_gamma_control_v1_add_listener (self->gamma_control, &gamma_control_listener, self);
}


static void
phosh_monitor_class_init (PhoshMonitorClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->constructed = phosh_monitor_constructed;
  object_class->dispose = phosh_monitor_dispose;
  object_class->finalize = phosh_monitor_finalize;

  object_class->set_property = phosh_monitor_set_property;
  object_class->get_property = phosh_monitor_get_property;

  /**
   * PhoshMonitor:wl-output:
   *
   * The wayland output associated with this monitor
   */
  props[PHOSH_MONITOR_PROP_WL_OUTPUT] =
    g_param_spec_pointer ("wl-output", "", "",
                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS);
  /**
   * PhoshMonitor:power-mode:
   *
   * The  power save mode for this monitor
   */
  props[PHOSH_MONITOR_PROP_POWER_MODE] =
    g_param_spec_enum ("power-mode", "", "",
                       PHOSH_TYPE_MONITOR_POWER_SAVE_MODE,
                       PHOSH_MONITOR_POWER_SAVE_MODE_OFF,
                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
  /**
   * PhoshMonitor:n-gamma-entries:
   *
   * The number of gamma entries for this monitor
   */
  props[PHOSH_MONITOR_PROP_N_GAMMA_ENTRIES] =
    g_param_spec_uint ("n-gamma-entries", "", "",
                       0, G_MAXUINT32, 0,
                       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);

  g_object_class_install_properties (object_class, PHOSH_MONITOR_PROP_LAST_PROP, props);

  /**
   * PhoshMonitor::configured:
   * @monitor: The #PhoshMonitor emitting the signal.
   *
   * Emitted whenever a monitor is fully configured (that is it
   * received all configuration data from the various wayland
   * protocols).
   */
  signals[SIGNAL_CONFIGURED] = g_signal_new ("configured",
                                             G_TYPE_FROM_CLASS (klass),
                                             G_SIGNAL_RUN_LAST,
                                             0, NULL, NULL, NULL,
                                             G_TYPE_NONE,
                                             0);
}


static void
phosh_monitor_init (PhoshMonitor *self)
{
  self->modes = g_array_new (FALSE, FALSE, sizeof(PhoshMonitorMode));
  self->power_mode = PHOSH_MONITOR_POWER_SAVE_MODE_OFF;
}


PhoshMonitor *
phosh_monitor_new_from_wl_output (gpointer wl_output)
{
  return g_object_new (PHOSH_TYPE_MONITOR, "wl-output", wl_output, NULL);
}

/**
 * phosh_monitor_get_current_mode: (skip)
 * @self: A monitor
 *
 * Get the monitor's current mode
 *
 * Returns:(transfer none): The mode
 */
PhoshMonitorMode *
phosh_monitor_get_current_mode (PhoshMonitor *self)
{
  g_return_val_if_fail (PHOSH_IS_MONITOR (self), NULL);
  g_return_val_if_fail (self->current_mode < self->modes->len, NULL);
  return &g_array_index (self->modes, PhoshMonitorMode, self->current_mode);
}


/**
 * phosh_monitor_is_configured:
 * @self: A #PhoshMonitor
 *
 * Returns: %TRUE if the monitor fully configured (received all
 * state updates from the compositor).
 */
gboolean
phosh_monitor_is_configured (PhoshMonitor *self)
{
  g_return_val_if_fail (PHOSH_IS_MONITOR (self), FALSE);
  return self->wl_output_done;
}


/**
 * phosh_monitor_is_builtin:
 * @self: A #PhoshMonitor
 *
 * Returns: %TRUE if the monitor built in panel (e.g. laptop panel or
 * phone LCD)
 */
gboolean
phosh_monitor_is_builtin (PhoshMonitor *self)
{
  PhoshShellDebugFlags debug_flags = phosh_shell_get_debug_flags ();
  g_return_val_if_fail (PHOSH_IS_MONITOR (self), FALSE);

  if (G_UNLIKELY (debug_flags & PHOSH_SHELL_DEBUG_FLAG_FAKE_BUILTIN)) {
    if (g_strcmp0 (self->name, "WL-1") == 0)
      return TRUE;
    else if (g_strcmp0 (self->name, "X11-1") == 0)
      return TRUE;
    else if (g_strcmp0 (self->name, "HEADLESS-1") == 0)
      return TRUE;
  }

  return phosh_monitor_connector_is_builtin (self->conn_type);
}


/**
 * phosh_monitor_is_flipped:
 * @self: A #PhoshMonitor
 *
 * Returns: %TRUE if the monitor's output is flipped
 */
gboolean
phosh_monitor_is_flipped (PhoshMonitor *self)
{
    switch (self->transform) {
    case WL_OUTPUT_TRANSFORM_FLIPPED_90:
    case WL_OUTPUT_TRANSFORM_FLIPPED_270:
    case WL_OUTPUT_TRANSFORM_FLIPPED:
    case WL_OUTPUT_TRANSFORM_FLIPPED_180:
      return TRUE;
    case WL_OUTPUT_TRANSFORM_90:
    case WL_OUTPUT_TRANSFORM_270:
    case WL_OUTPUT_TRANSFORM_NORMAL:
    case WL_OUTPUT_TRANSFORM_180:
      return FALSE;
    default:
      g_assert_not_reached ();
    }
}


/**
 * phosh_monitor_has_gamma:
 * @self: A #PhoshMonitor
 *
 * Returns: %TRUE if the monitor can modify gamma
 */
gboolean
phosh_monitor_has_gamma (PhoshMonitor *self)
{
  return self->gamma_control && (self->n_gamma_entries > 0);
}


/**
 * phosh_monitor_get_transform:
 * @self: A #PhoshMonitor
 *
 * Returns: The monitor's output transform
 */
guint
phosh_monitor_get_transform (PhoshMonitor *self)
{
    switch (self->transform) {
    case WL_OUTPUT_TRANSFORM_90:
      return PHOSH_MONITOR_TRANSFORM_90;
    case WL_OUTPUT_TRANSFORM_FLIPPED_90:
      return PHOSH_MONITOR_TRANSFORM_FLIPPED_90;
    case WL_OUTPUT_TRANSFORM_180:
      return PHOSH_MONITOR_TRANSFORM_180;
    case WL_OUTPUT_TRANSFORM_FLIPPED_180:
      return PHOSH_MONITOR_TRANSFORM_FLIPPED_180;
    case WL_OUTPUT_TRANSFORM_270:
      return PHOSH_MONITOR_TRANSFORM_270;
    case WL_OUTPUT_TRANSFORM_FLIPPED_270:
      return PHOSH_MONITOR_TRANSFORM_FLIPPED_270;
    case WL_OUTPUT_TRANSFORM_NORMAL:
      return PHOSH_MONITOR_TRANSFORM_NORMAL;
    case WL_OUTPUT_TRANSFORM_FLIPPED:
      return PHOSH_MONITOR_TRANSFORM_FLIPPED;
    default:
      g_assert_not_reached ();
    }
}


/**
 * phosh_monitor_set_power_save_mode:
 * @self: A #PhoshMonitor
 * @mode: The #PhoshMonitorPowerSaveMode
 *
 * Sets monitor's power save mode.
 */
void
phosh_monitor_set_power_save_mode (PhoshMonitor *self, PhoshMonitorPowerSaveMode mode)
{
  enum zwlr_output_power_v1_mode wl_mode;

  g_return_if_fail (PHOSH_IS_MONITOR (self));
  g_return_if_fail (phosh_monitor_is_configured (self));
  g_return_if_fail (self->wlr_output_power);

  switch (mode) {
  case PHOSH_MONITOR_POWER_SAVE_MODE_OFF:
    wl_mode = ZWLR_OUTPUT_POWER_V1_MODE_OFF;
    break;
  case PHOSH_MONITOR_POWER_SAVE_MODE_ON:
    wl_mode = ZWLR_OUTPUT_POWER_V1_MODE_ON;
    break;
  default:
    g_return_if_reached ();
  }

  zwlr_output_power_v1_set_mode (self->wlr_output_power, wl_mode);
}

/**
 * phosh_monitor_get_power_save_mode:
 * @self: A #PhoshMonitor
 *
 * Returns: The current power save mode
 */
PhoshMonitorPowerSaveMode
phosh_monitor_get_power_save_mode (PhoshMonitor *self)
{
  return self->power_mode;
}


PhoshMonitorConnectorType
phosh_monitor_connector_type_from_name (const char *name)
{
  if (g_str_has_prefix (name, "LVDS-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_LVDS;
  else if (g_str_has_prefix (name, "HDMI-A-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_HDMIA;
  else if (g_str_has_prefix (name, "eDP-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_eDP;
  else if (g_str_has_prefix (name, "DSI-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_DSI;
  else if (g_str_has_prefix (name, "HEADLESS-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_VIRTUAL;
  else if (g_str_has_prefix (name, "WL-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_VIRTUAL;
  else if (g_str_has_prefix (name, "X11-"))
    return PHOSH_MONITOR_CONNECTOR_TYPE_VIRTUAL;
  else
    return PHOSH_MONITOR_CONNECTOR_TYPE_Unknown;
}


gboolean
phosh_monitor_connector_is_builtin (PhoshMonitorConnectorType conn_type)
{
  switch (conn_type) {
  case PHOSH_MONITOR_CONNECTOR_TYPE_eDP:
  case PHOSH_MONITOR_CONNECTOR_TYPE_LVDS:
  case PHOSH_MONITOR_CONNECTOR_TYPE_DSI:
    return TRUE;
  case PHOSH_MONITOR_CONNECTOR_TYPE_Unknown:
  case PHOSH_MONITOR_CONNECTOR_TYPE_VGA:
  case PHOSH_MONITOR_CONNECTOR_TYPE_DVII:
  case PHOSH_MONITOR_CONNECTOR_TYPE_DVID:
  case PHOSH_MONITOR_CONNECTOR_TYPE_DVIA:
  case PHOSH_MONITOR_CONNECTOR_TYPE_Composite:
  case PHOSH_MONITOR_CONNECTOR_TYPE_SVIDEO:
  case PHOSH_MONITOR_CONNECTOR_TYPE_Component:
  case PHOSH_MONITOR_CONNECTOR_TYPE_9PinDIN:
  case PHOSH_MONITOR_CONNECTOR_TYPE_DisplayPort:
  case PHOSH_MONITOR_CONNECTOR_TYPE_HDMIA:
  case PHOSH_MONITOR_CONNECTOR_TYPE_HDMIB:
  case PHOSH_MONITOR_CONNECTOR_TYPE_TV:
  case PHOSH_MONITOR_CONNECTOR_TYPE_VIRTUAL:
  default:
    return FALSE;
  }
}

struct wl_output*
phosh_monitor_get_wl_output (PhoshMonitor *self)
{
  g_return_val_if_fail (PHOSH_IS_MONITOR (self), NULL);

  return self->wl_output;
}

/**
 * phosh_monitor_get_fractional_scale:
 * @self: The monitor
 *
 * Get the fractinoal scale determined from the output width and the
 * current logical width.
 * Returns: the fractional scale
*/
float
phosh_monitor_get_fractional_scale (PhoshMonitor *self)
{
  float width;
  PhoshMonitorMode *mode;

  g_return_val_if_fail (PHOSH_IS_MONITOR (self), 1.0);
  g_return_val_if_fail (phosh_monitor_is_configured (self), 1.0);

  mode = phosh_monitor_get_current_mode (self);
  g_return_val_if_fail (mode, 1.0);

  switch (self->transform) {
  case PHOSH_MONITOR_TRANSFORM_NORMAL:
  case PHOSH_MONITOR_TRANSFORM_180:
  case PHOSH_MONITOR_TRANSFORM_FLIPPED:
  case PHOSH_MONITOR_TRANSFORM_FLIPPED_180:
    width = self->logical.width;
    break;
  default:
    width = self->logical.height;
  }
  return mode->width / width;
}


/**
 * phosh_monitor_is_preferred_mode:
 * @self: The monitor
 *
 * Checks whether the current monitor's mode is the monitor's
 * preferred mode.
 *
 * Returns: %TRUE if the current mode is the display's preferred mode.
 *     Otherwise %FALSE.
*/
gboolean
phosh_monitor_is_preferred_mode (PhoshMonitor *self)
{
  PhoshMonitorMode *mode;

  g_return_val_if_fail (PHOSH_IS_MONITOR (self), 1.0);
  g_return_val_if_fail (phosh_monitor_is_configured (self), TRUE);

  mode = phosh_monitor_get_current_mode (self);
  g_return_val_if_fail (mode, TRUE);

  return self->current_mode == self->preferred_mode;
}


/**
 * phosh_monitor_transform_is_tilted:
 * @transform: a #PhoshMonitorTransform
 *
 * We consider a transform to tilt the display if it changes the
 * display orientation from portrait to landscape or vice versa.
 *
 * Returns: %TRUE for tilted transforms, otherwise %FALSE
 */
gboolean
phosh_monitor_transform_is_tilted (PhoshMonitorTransform transform)
{
  switch (transform) {
  case PHOSH_MONITOR_TRANSFORM_NORMAL:
  case PHOSH_MONITOR_TRANSFORM_180:
  case PHOSH_MONITOR_TRANSFORM_FLIPPED:
  case PHOSH_MONITOR_TRANSFORM_FLIPPED_180:
    return FALSE;
  case PHOSH_MONITOR_TRANSFORM_90:
  case PHOSH_MONITOR_TRANSFORM_270:
  case PHOSH_MONITOR_TRANSFORM_FLIPPED_90:
  case PHOSH_MONITOR_TRANSFORM_FLIPPED_270:
    return TRUE;
  default:
    g_return_val_if_reached (FALSE);
  }
}

#include <glib.h>

gboolean
phosh_monitor_set_color_temp (PhoshMonitor *self, guint32 temp)
{
  g_autofd int fd = -1;
  guint16 *table;
  off_t size;

  if (!phosh_monitor_has_gamma (self))
    return FALSE;

  size = self->n_gamma_entries * sizeof (guint16) * 3;
  fd = phosh_create_shm_file (size);
  if (fd < 0) {
    g_warning ("Failed to create shm file");
    return FALSE;
  }

  table = mmap (NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (table == MAP_FAILED) {
    g_warning ("Failed to map gamma table");
    return FALSE;
  }

  phosh_gamma_table_fill (table, self->n_gamma_entries, temp);
  munmap (table, size);
  zwlr_gamma_control_v1_set_gamma (self->gamma_control, fd);

  return TRUE;
}
