import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:shared_preferences/shared_preferences.dart';

enum JzThemePreference { system, light, dark }

class ThemeStore extends ChangeNotifier {
  ThemeStore._();

  static final instance = ThemeStore._();
  static const _key = 'theme_preference';
  static const _channel = MethodChannel('com.miaoji/screenshot');

  JzThemePreference _preference = JzThemePreference.system;

  JzThemePreference get preference => _preference;

  ThemeMode get themeMode => switch (_preference) {
    JzThemePreference.light => ThemeMode.light,
    JzThemePreference.dark => ThemeMode.dark,
    JzThemePreference.system => ThemeMode.system,
  };

  Future<void> initialize() async {
    final value = (await SharedPreferences.getInstance()).getString(_key);
    _preference = JzThemePreference.values.firstWhere(
      (item) => item.name == value,
      orElse: () => JzThemePreference.system,
    );
    await _syncNativeTheme();
  }

  Future<void> setPreference(JzThemePreference value) async {
    if (_preference == value) return;
    _preference = value;
    notifyListeners();
    await (await SharedPreferences.getInstance()).setString(_key, value.name);
    await _syncNativeTheme();
  }

  Future<void> _syncNativeTheme() async {
    try {
      await _channel.invokeMethod<bool>('setThemeMode', {
        'mode': _preference.name,
      });
    } on MissingPluginException {
      // Native startup themes are Android-only.
    }
  }
}