import 'dart:convert';

import 'package:color_blindness/color_blindness.dart';
import 'package:flutter/material.dart';
import 'package:logging/logging.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../models/focus_mode_data.dart';
import '../models/settings/network_capabilities_settings.dart';
import '../utils/theme_mode_extensions.dart';

const _lowBandwidthModeKey = 'LowBandwidthMode';
const _themeModeKey = 'ThemeMode';
const _colorBlindnessTestingModeKey = 'ColorBlindnessTestingMode';
const _logLevelKey = 'LogLevel';
const _networkCapabilitiesKey = 'NetworkCapabilities';
const _notificationGroupingKey = 'NotificationGrouping';
const _spoilerHidingEnabledKey = 'SpoilerHidingEnabled';
const _focusModeKey = 'FocusMode';

class SettingsService extends ChangeNotifier {
  late final SharedPreferences _prefs;
  var _initialized = false;

  SettingsService();

  var _lowBandwidthMode = false;

  bool get lowBandwidthMode => _lowBandwidthMode;

  set lowBandwidthMode(bool value) {
    _lowBandwidthMode = value;
    _prefs.setBool(_lowBandwidthModeKey, _lowBandwidthMode);
    notifyListeners();
  }

  var _notificationGrouping = true;

  bool get notificationGrouping => _notificationGrouping;

  set notificationGrouping(bool value) {
    _notificationGrouping = value;
    _prefs.setBool(_notificationGroupingKey, _notificationGrouping);
    notifyListeners();
  }

  var _spoilerHidingEnabled = true;

  bool get spoilerHidingEnabled => _spoilerHidingEnabled;

  set spoilerHidingEnabled(bool value) {
    _spoilerHidingEnabled = value;
    _prefs.setBool(_spoilerHidingEnabledKey, _spoilerHidingEnabled);
    notifyListeners();
  }

  var _themeMode = ThemeMode.system;

  ThemeMode get themeMode => _themeMode;

  set themeMode(ThemeMode mode) {
    _themeMode = mode;
    _prefs.setString(_themeModeKey, _themeMode.name);
    notifyListeners();
  }

  ColorBlindnessType _colorBlindnessType = ColorBlindnessType.none;

  ColorBlindnessType get colorBlindnessType => _colorBlindnessType;

  set colorBlindnessType(ColorBlindnessType type) {
    _colorBlindnessType = type;
    _prefs.setString(_colorBlindnessTestingModeKey, type.name);
    notifyListeners();
  }

  Level _logLevel = Level.SEVERE;

  Level get logLevel => _logLevel;

  set logLevel(Level level) {
    _logLevel = level;
    _prefs.setString(_logLevelKey, level.name);
    notifyListeners();
  }

  NetworkCapabilitiesSettings _networkCapabilities =
      NetworkCapabilitiesSettings.defaultSettings();

  NetworkCapabilitiesSettings get networkCapabilities => _networkCapabilities;

  set networkCapabilities(NetworkCapabilitiesSettings updatedCapabilities) {
    _networkCapabilities = updatedCapabilities;
    final jsonString = jsonEncode(_networkCapabilities.toJson());
    _prefs.setString(_networkCapabilitiesKey, jsonString);
    notifyListeners();
  }

  FocusModeData _focusModeData = FocusModeData.disabled();

  FocusModeData get focusModeData => _focusModeData;

  set focusModeData(FocusModeData updatedData) {
    _focusModeData = updatedData;
    final jsonData = _focusModeData.toJson();
    final jsonString = jsonEncode(jsonData);
    _prefs.setString(_focusModeKey, jsonString);
    notifyListeners();
  }

  Future<void> initialize() async {
    if (_initialized) {
      return;
    }
    _prefs = await SharedPreferences.getInstance();
    _lowBandwidthMode = _prefs.getBool(_lowBandwidthModeKey) ?? false;
    _notificationGrouping = _prefs.getBool(_notificationGroupingKey) ?? true;
    _spoilerHidingEnabled = _prefs.getBool(_spoilerHidingEnabledKey) ?? true;
    _themeMode = ThemeModeExtensions.parse(_prefs.getString(_themeModeKey));
    _colorBlindnessType = _colorBlindnessTypeFromPrefs(_prefs);
    _logLevel = _levelFromPrefs(_prefs);
    _networkCapabilities = _networkCapabilitiesFromPrefs(_prefs);
    _focusModeData = _focusModeDataFromPrefs(_prefs);
    _initialized = true;
  }
}

ColorBlindnessType _colorBlindnessTypeFromPrefs(SharedPreferences prefs) {
  final cbString = prefs.getString(_colorBlindnessTestingModeKey);
  if (cbString?.isEmpty ?? true) {
    return ColorBlindnessType.none;
  }
  return ColorBlindnessType.values.firstWhere(
    (c) => c.name == cbString,
    orElse: () => ColorBlindnessType.none,
  );
}

NetworkCapabilitiesSettings _networkCapabilitiesFromPrefs(
    SharedPreferences prefs) {
  final ncString = prefs.getString(_networkCapabilitiesKey);
  if (ncString?.isEmpty ?? true) {
    return NetworkCapabilitiesSettings.defaultSettings();
  }

  final List<dynamic> json = jsonDecode(ncString!);
  final nc = NetworkCapabilitiesSettings.fromJson(json);
  return nc;
}

Level _levelFromPrefs(SharedPreferences prefs) {
  final levelString = prefs.getString(_logLevelKey);
  return switch (levelString) {
    'ALL' => Level.ALL,
    'FINEST' => Level.FINEST,
    'FINER' => Level.FINER,
    'FINE' => Level.FINE,
    'CONFIG' => Level.CONFIG,
    'INFO' => Level.INFO,
    'WARNING' => Level.WARNING,
    'SEVERE' => Level.SEVERE,
    'SHOUT' => Level.SHOUT,
    'OFF' => Level.OFF,
    _ => Level.OFF,
  };
}

FocusModeData _focusModeDataFromPrefs(SharedPreferences prefs) {
  final fmString = prefs.getString(_focusModeKey);
  if (fmString?.isEmpty ?? true) {
    return FocusModeData.disabled();
  }

  final Map<String, dynamic> json = jsonDecode(fmString!);
  final fm = FocusModeData.fromJson(json);
  return fm;
}