// 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 'package:universal_ble/universal_ble.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 {
    if (_cachedMotives.isEmpty) {
      return BadgeMotive(-1, "No motives");
    }
    return BadgeMotive(-1, "Unspecified motive");
  }

  @override
  Future<List<BadgeMotive>> getMotives() async {
    bool gotMotives = false;
    if (await _device.device.connectionState == BleConnectionState.connected) {
      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.split("-");
            if (parts.length != 2) {
              return BadgeMotive(-1, "Invalid value");
            }
            return BadgeMotive(int.tryParse(parts[0]) ?? -1, parts[1]);
          })
          .toList(growable: false);
      gotMotives = true;
    }
    if (!gotMotives) {
      _cachedMotives = [BadgeMotive(-1, "Failed fetching motives")];
    }

    return _cachedMotives;
  }

  @override
  Future<void> setCurrentMotive(BadgeMotive motive) async {}
}