/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/*
 * Copyright (C) 2016 Red Hat
 *
 * 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.
 */

#include "config.h"

#include "backends/meta-backend-private.h"
#include "backends/meta-logical-monitor.h"

G_DEFINE_TYPE (MetaLogicalMonitor, meta_logical_monitor, G_TYPE_OBJECT)

static MetaMonitor *
get_first_monitor (MetaMonitorManager *monitor_manager,
                   GList              *monitor_configs)
{
  MetaMonitorConfig *first_monitor_config;
  MetaMonitorSpec *first_monitor_spec;

  first_monitor_config = g_list_first (monitor_configs)->data;
  first_monitor_spec = first_monitor_config->monitor_spec;

  return meta_monitor_manager_get_monitor_from_spec (monitor_manager,
                                                     first_monitor_spec);
}

typedef struct
{
  MetaMonitorManager *monitor_manager;
  MetaLogicalMonitor *logical_monitor;
} AddMonitorFromConfigData;

static void
add_monitor_from_config (MetaMonitorConfig        *monitor_config,
                         AddMonitorFromConfigData *data)
{
  MetaMonitorSpec *monitor_spec;
  MetaMonitor *monitor;

  monitor_spec = monitor_config->monitor_spec;
  monitor = meta_monitor_manager_get_monitor_from_spec (data->monitor_manager,
                                                        monitor_spec);

  meta_logical_monitor_add_monitor (data->logical_monitor, monitor);
}

MetaLogicalMonitor *
meta_logical_monitor_new (MetaMonitorManager       *monitor_manager,
                          MetaLogicalMonitorConfig *logical_monitor_config,
                          int                       monitor_number)
{
  MetaLogicalMonitor *logical_monitor;
  GList *monitor_configs;
  MetaMonitor *first_monitor;
  MetaOutput *main_output;

  logical_monitor = g_object_new (META_TYPE_LOGICAL_MONITOR, NULL);

  monitor_configs = logical_monitor_config->monitor_configs;
  first_monitor = get_first_monitor (monitor_manager, monitor_configs);
  main_output = meta_monitor_get_main_output (first_monitor);

  logical_monitor->number = monitor_number;
  logical_monitor->winsys_id = main_output->winsys_id;
  logical_monitor->scale = logical_monitor_config->scale;
  logical_monitor->transform = logical_monitor_config->transform;
  logical_monitor->in_fullscreen = -1;
  logical_monitor->rect = logical_monitor_config->layout;

  logical_monitor->is_presentation = TRUE;
  g_list_foreach (monitor_configs, (GFunc) add_monitor_from_config,
                  &(AddMonitorFromConfigData) {
                    .monitor_manager = monitor_manager,
                    .logical_monitor = logical_monitor
                  });

  return logical_monitor;
}

static MetaMonitorTransform
derive_monitor_transform (MetaMonitor *monitor)
{
  MetaOutput *main_output;

  main_output = meta_monitor_get_main_output (monitor);

  return main_output->crtc->transform;
}

MetaLogicalMonitor *
meta_logical_monitor_new_derived (MetaMonitorManager *monitor_manager,
                                  MetaMonitor        *monitor,
                                  MetaRectangle      *layout,
                                  int                 monitor_number)
{
  MetaLogicalMonitor *logical_monitor;
  MetaOutput *main_output;
  MetaMonitorMode *monitor_mode;
  int scale;
  MetaMonitorTransform transform;

  logical_monitor = g_object_new (META_TYPE_LOGICAL_MONITOR, NULL);

  monitor_mode = meta_monitor_get_current_mode (monitor);
  scale = meta_monitor_manager_calculate_monitor_mode_scale (monitor_manager,
                                                             monitor,
                                                             monitor_mode);

  transform = derive_monitor_transform (monitor);

  main_output = meta_monitor_get_main_output (monitor);
  logical_monitor->number = monitor_number;
  logical_monitor->winsys_id = main_output->winsys_id;
  logical_monitor->scale = scale;
  logical_monitor->transform = transform;
  logical_monitor->in_fullscreen = -1;
  logical_monitor->rect = *layout;

  logical_monitor->is_presentation = TRUE;
  meta_logical_monitor_add_monitor (logical_monitor, monitor);

  return logical_monitor;
}

void
meta_logical_monitor_add_monitor (MetaLogicalMonitor *logical_monitor,
                                  MetaMonitor        *monitor)
{
  GList *l;
  gboolean is_presentation;

  is_presentation = logical_monitor->is_presentation;
  logical_monitor->monitors = g_list_append (logical_monitor->monitors,
                                             monitor);

  for (l = logical_monitor->monitors; l; l = l->next)
    {
      MetaMonitor *monitor = l->data;
      GList *outputs;
      GList *l_output;

      outputs = meta_monitor_get_outputs (monitor);
      for (l_output = outputs; l_output; l_output = l_output->next)
        {
          MetaOutput *output = l_output->data;

          is_presentation = is_presentation && output->is_presentation;
          if (output->crtc)
            output->crtc->logical_monitor = logical_monitor;
        }
    }

  logical_monitor->is_presentation = is_presentation;
}

gboolean
meta_logical_monitor_is_primary (MetaLogicalMonitor *logical_monitor)
{
  return logical_monitor->is_primary;
}

void
meta_logical_monitor_make_primary (MetaLogicalMonitor *logical_monitor)
{
  logical_monitor->is_primary = TRUE;
}

int
meta_logical_monitor_get_scale (MetaLogicalMonitor *logical_monitor)
{
  return logical_monitor->scale;
}

GList *
meta_logical_monitor_get_monitors (MetaLogicalMonitor *logical_monitor)
{
  return logical_monitor->monitors;
}

static void
meta_logical_monitor_init (MetaLogicalMonitor *logical_monitor)
{
}

static void
meta_logical_monitor_class_init (MetaLogicalMonitorClass *klass)
{
}

gboolean
meta_logical_monitor_has_neighbor (MetaLogicalMonitor  *logical_monitor,
                                   MetaLogicalMonitor  *neighbor,
                                   MetaScreenDirection  neighbor_direction)
{
  switch (neighbor_direction)
    {
    case META_SCREEN_RIGHT:
      if (neighbor->rect.x == (logical_monitor->rect.x +
                               logical_monitor->rect.width) &&
          meta_rectangle_vert_overlap (&neighbor->rect,
                                       &logical_monitor->rect))
        return TRUE;
      break;
    case META_SCREEN_LEFT:
      if (logical_monitor->rect.x == (neighbor->rect.x +
                                      neighbor->rect.width) &&
          meta_rectangle_vert_overlap (&neighbor->rect,
                                       &logical_monitor->rect))
        return TRUE;
      break;
    case META_SCREEN_UP:
      if (logical_monitor->rect.y == (neighbor->rect.y +
                                      neighbor->rect.height) &&
          meta_rectangle_horiz_overlap (&neighbor->rect,
                                        &logical_monitor->rect))
        return TRUE;
      break;
    case META_SCREEN_DOWN:
      if (neighbor->rect.y == (logical_monitor->rect.y +
                               logical_monitor->rect.height) &&
          meta_rectangle_horiz_overlap (&neighbor->rect,
                                        &logical_monitor->rect))
        return TRUE;
      break;
    }

  return FALSE;
}