import 'package:blog_app/utils/theme_utils.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

class ThemeProvider with ChangeNotifier {
  static const String _themeKey = 'selected_theme';
  static const String _darkModeKey = 'is_dark_mode';

  bool isDarkMode = false;
  ThemeColor currentTheme = defaultThemes[0];

  late SharedPreferences _prefs;
  bool isInitialized = false;

  ThemeProvider() {
    _initPreferences();
  }

  // 初始化 SharedPreferences
  Future<void> _initPreferences() async {
    _prefs = await SharedPreferences.getInstance();
    _loadPreferences();

    isInitialized = true;
    notifyListeners();
  }

  // 加载存储的设置
  void _loadPreferences() {
    isDarkMode = _prefs.getBool(_darkModeKey) ?? false;

    // 加载主题色
    final themeName = _prefs.getString(_themeKey);
    if (themeName != null) {
      currentTheme = getThemeColor(themeName);
    }
  }

  // 保存主题色
  Future<void> _saveTheme() async {
    await _prefs.setString(_themeKey, currentTheme.name);
  }

  // 保存暗黑模式
  Future<void> _saveDarkMode() async {
    await _prefs.setBool(_darkModeKey, isDarkMode);
  }

  List<ThemeColor> get availableThemes => defaultThemes;

  // 切换明暗模式
  void toggleDarkMode(bool value) {
    isDarkMode = value;
    _saveDarkMode();
    notifyListeners();
  }

  // 更改主题色
  void changeTheme(ThemeColor theme) {
    currentTheme = theme;
    _saveTheme();
    notifyListeners();
  }

  ThemeData get currentThemeData {
    return ThemeData(
      primarySwatch: currentTheme.materialColor,
      colorScheme: ColorScheme.fromSeed(
        seedColor: currentTheme.primaryColor,
        brightness: isDarkMode ? Brightness.dark : Brightness.light,
      ),
      useMaterial3: true,
      fontFamily: 'CustomFont',
    );
  }
}