/*
 * Simple cli BLE test client
 *
 * Copyright (C) 2024 Bernhard Guillon <Bernhard.Guillon@begu.org>
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * SPDX: GPL-2.0-or-later
 * https://spdx.org/licenses/GPL-2.0-or-later.html
 */

import 'package:bluez/bluez.dart';
import 'dart:io';

void main(List<String> arguments) async {

  if (arguments.length < 1) {
    print("usage: space_light RGBCW in hex with");
    print("each of    RGB 0..FF");
    print("each of    CW  0..64");
    print("example: space_light 0xFF,0x10,0xBA,0x10,0x20");
    exit(-1);
  }

  List<int> data = [];
  for(var c in arguments[0].split(',')) {
    data.add(int.parse(c.split('x').last, radix: 16));
  }

  const String address = "8D:FE:5B:68:D6:D9";
  const String service_uuid = "00000000-0000-1000-8000-00805f9b34fb";
  const String characteristic_uuid = "00000001-0000-1001-8001-00805f9b07d0";

  var client = BlueZClient();
  await client.connect();


  if (client.adapters.isEmpty) {
    print('No Bluetooth adapters found');
    await client.close();
    exit(-1);
  }
  var adapter = client.adapters[0];

  // FIXME: implement pairing without we have to scan to make
  //        the device known to hci0 ^^
  print('Searching for devices on ${adapter.name}...');
  for (var device in client.devices) {
    print('  ${device.address} ${device.name}');
  }
  client.deviceAdded
      .listen((device) => print('  ${device.address} ${device.name}'));

  await adapter.startDiscovery();
  await Future.delayed(Duration(seconds: 1));
  await adapter.stopDiscovery();

  // FIXME: use the device from the scan but as we want to get rid of it anyways keep as is
  var dev = client.devices.where((device) => device.address == address);
  // TODO: find out if there is something like defer or RAII
  if (dev.isEmpty) {
    print('Device $address not available');
    await client.close();
    exit(-1);
  }
  try {
    await dev.first.connect();
  }
  catch(e) {
    print("error connecting..");
  }

  var service = dev.first.gattServices.where((service) => service.uuid.toString() == service_uuid);
  // TODO: find out if there is something like defer or RAII
  if (service.isEmpty) {
    print('service $address not available');
    await client.close();
    exit(-1);
  }
  var characteristic = service.first.characteristics.where((characteristic) => characteristic.uuid.toString() == characteristic_uuid);
  // TODO: find out if there is something like defer or RAII
  if (characteristic.isEmpty) {
    print('characteristic $characteristic_uuid not available');
    await client.close();
    exit(-1);
  }
  print("Sending data...");
  await characteristic.first.writeValue(data);
  exit(0);
}