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// Copyright (C) 2025, uvok cheetah
//
// 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 3 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, see <https://www.gnu.org/licenses/>.
import 'dart:convert';
import 'dart:io';
import 'package:universal_ble/universal_ble.dart';
import 'package:uvok_epaper_badge/string_ext.dart';
import 'package:uvok_epaper_badge/badge_exception.dart';
import 'package:uvok_epaper_badge/model/badge_motive.dart';
import 'package:uvok_epaper_badge/model/device/universal_ble_device.dart';
import 'package:uvok_epaper_badge/model/motive_selection/badge_motive_selection.dart';
class UniversalBlueMotiveSelection implements BadgeMotiveSelection {
final UniversalBleDevice _device;
final String _badgeService = "ca260000-b4bb-46b2-bd06-b7b7a61ea990";
final String _currentMotiveCharacteristic =
"ca260001-b4bb-46b2-bd06-b7b7a61ea990";
final String _availableMotivesCharacteristic =
"ca260002-b4bb-46b2-bd06-b7b7a61ea990";
List<BadgeMotive> _cachedMotives = [];
UniversalBlueMotiveSelection({required UniversalBleDevice device})
: _device = device;
@override
Future<BadgeMotive> getCurrentMotive() async {
await _ensureConnected();
if (_cachedMotives.isEmpty) {
await getMotives();
}
if (_cachedMotives.isEmpty) {
throw BadgeException(
"No motives available, so there's no current motive",
);
}
try {
var c = await _device.device.getCharacteristic(
_currentMotiveCharacteristic,
service: _badgeService,
);
var val = await c.read();
int? currentMotive = int.tryParse(ascii.decode(val));
if (currentMotive == null) {
throw BadgeException("Error reading current motive.");
}
return _cachedMotives.singleWhere(
(bm) => bm.id == currentMotive,
orElse: () => throw BadgeException("Selected motive not in templates"),
);
} on NotFoundException {
throw BadgeException("Characeristic/Service not found.");
}
}
@override
Future<List<BadgeMotive>> getMotives() async {
await _ensureConnected();
try {
var c = await _device.device.getCharacteristic(
_availableMotivesCharacteristic,
service: _badgeService,
);
var val = await c.read();
var templates = ascii.decode(val);
_cachedMotives = templates
.split(";")
.where((s) => s.isNotEmpty)
.map((String s) {
List<String> parts = s.splitFirst("-");
if (parts.length != 2) {
return BadgeMotive(-1, "Invalid value");
}
return BadgeMotive(int.tryParse(parts[0]) ?? -1, parts[1]);
})
.toList(growable: false);
} on NotFoundException {
throw BadgeException("Characeristic/Service not found.");
}
return _cachedMotives;
}
Future<void> _ensureConnected() async {
if (await _device.device.connectionState != BleConnectionState.connected) {
throw BadgeException("Not connected");
}
}
@override
Future<void> setCurrentMotive(BadgeMotive motive) async {
await _ensureConnected();
try {
var c = await _device.device.getCharacteristic(
_currentMotiveCharacteristic,
service: _badgeService,
);
await c.write(ascii.encode(motive.id.toString()), withResponse: false);
} on NotFoundException {
throw BadgeException("Characeristic/Service not found.");
}
}
}
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