/*
 * Copyright 2013 Canonical Ltd.
 *
 * 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; version 3.
 *
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *   Charles Kerr <charles.kerr@canonical.com>
 */

/**
 * Bluetooth implementaion which uses bluez over dbus 
 */
public class Bluez: Bluetooth
{
  private org.bluez.Manager manager;
  private org.bluez.Adapter default_adapter;
  private HashTable<string,Bluetooth.Device> devices;

  public Bluez (KillSwitch killswitch)
  {
    base (killswitch);

    string default_adapter_object_path = null;

    this.devices = new HashTable<string,Bluetooth.Device>(str_hash, str_equal);

    try
      {
        manager = Bus.get_proxy_sync (BusType.SYSTEM, "org.bluez", "/");

        manager.default_adapter_changed.connect ((object_path) => on_default_adapter_changed (object_path));
        default_adapter_object_path = manager.default_adapter ();
      }
    catch (Error e)
     {
       critical ("%s", e.message);
     }

    on_default_adapter_changed (default_adapter_object_path);
  }

  private void on_default_adapter_changed (string? object_path)
  {
    if (object_path != null) try
      {
        message ("using default adapter at %s", object_path);
        default_adapter = Bus.get_proxy_sync (BusType.SYSTEM, "org.bluez", object_path);
        default_adapter.property_changed.connect(() => on_default_adapter_properties_changed());

        default_adapter.device_created.connect((adapter, path) => add_device (path));
        default_adapter.device_removed.connect((adapter, path) => devices.remove (path));
        foreach (string device_path in default_adapter.list_devices())
          add_device (device_path);
      }
    catch (Error e)
     {
       critical ("%s", e.message);
     }

    this.on_default_adapter_properties_changed ();
  }

  private void add_device (string object_path)
  {
    try
      {
        org.bluez.Device device = Bus.get_proxy_sync (BusType.SYSTEM, "org.bluez", object_path);
        message ("got device proxy for %s", object_path);
        var properties = device.get_properties ();

        Variant v = properties.lookup ("Alias");
        if (v == null)
          v = properties.lookup ("Name");
        string name = v == null ? _("Unknown") : v.get_string();

        bool supports_browsing = false;
        v = properties.lookup ("UUIDs");
        message ("%s", v.print(true));

        bool supports_file_transfer = false;

        //protected static bool uuid_supports_file_transfer (string uuid)
        //protected static bool uuid_supports_browsing (string uuid)

        var dev = new Bluetooth.Device (name,
                                        supports_browsing,
                                        supports_file_transfer);
        devices.insert (object_path, dev);
        message ("devices.size() is %u", devices.size());
      }
    catch (Error e)
     {
       critical ("%s", e.message);
     }
  }

  private void on_default_adapter_properties_changed ()
  {
    bool is_discoverable = false;
    bool is_powered = false;

    if (this.default_adapter != null) try
      {
        var properties = this.default_adapter.get_properties();

        var v = properties.lookup("Discoverable");
        is_discoverable = (v != null) && v.get_boolean ();

        v = properties.lookup("Powered");
        is_powered = (v != null) && v.get_boolean ();
      }
    catch (Error e) 
     {
       critical ("%s", e.message);
     }

    this.powered = is_powered;
    this.discoverable = is_discoverable;
  }

  public override void try_set_discoverable (bool b)
  {
    if (discoverable != b) try
      {
        this.default_adapter.set_property ("Discoverable", new Variant.boolean(b));
      }
    catch (Error e)
      {
        critical ("%s", e.message);
      }
  }
}