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

final Map<String, MaterialColor> appColors = {
  'Blue': Colors.blue,
  'Green': Colors.green,
  'Red': Colors.red,
  'Purple': Colors.purple,
  'Orange': Colors.orange,
  'Teal': Colors.teal,
};

class ThemeNotifier with ChangeNotifier {

  // 기본 테마 설정
  ThemeData _themeData = ThemeData(
    primarySwatch: Colors.blue,
    useMaterial3: true,
    scaffoldBackgroundColor: Colors.grey[50],
    appBarTheme: const AppBarTheme(
      backgroundColor: Colors.white,
      elevation: 0,
      iconTheme: IconThemeData(color: Colors.black),
      titleTextStyle: TextStyle(
        color: Colors.black,
        fontSize: 20,
        fontWeight: FontWeight.bold,
      ),
    ),
  );
  
  final String _themeKey = 'selected_theme';
  final String _darkModeKey = 'is_dark_mode';
  // 🔽 [신규] 폰트 크기 키
  final String _textScaleKey = 'text_scale_factor';

  MaterialColor _currentColor = Colors.blue;
  bool _isDarkMode = false;
  // 🔽 [신규] 폰트 배율 (기본 1.0)
  double _textScaleFactor = 1.0; 

  ThemeData get currentTheme => ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: _currentColor,
          brightness: Brightness.light,
        ),
        useMaterial3: true,
        brightness: Brightness.light,
      );
      
  ThemeData get currentDarkTheme => ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: _currentColor,
          brightness: Brightness.dark,
        ),
        useMaterial3: true,
        brightness: Brightness.dark,
      );
      
  ThemeMode get currentThemeMode => _isDarkMode ? ThemeMode.dark : ThemeMode.light;
  
  bool get isDarkMode => _isDarkMode;
  MaterialColor get currentColor => _currentColor;
  
  // 🔽 [신규] getter
  double get textScaleFactor => _textScaleFactor;

  ThemeNotifier() {
    _loadTheme();
  }

  void _loadTheme() async {
    final prefs = await SharedPreferences.getInstance();
    
    final themeName = prefs.getString(_themeKey) ?? 'Blue';
    _currentColor = appColors[themeName] ?? Colors.blue;
    
    _isDarkMode = prefs.getBool(_darkModeKey) ?? false;

    // 🔽 [신규] 로드
    _textScaleFactor = prefs.getDouble(_textScaleKey) ?? 1.0;
    
    notifyListeners();
  }

// [Fix] main.dart에서 호출하는 메서드 추가
  ThemeData getTheme() => _themeData;

  void setTheme(String themeName) async {
    final newColor = appColors[themeName];
    if (newColor == null) return;

    _currentColor = newColor;
    notifyListeners();

    final prefs = await SharedPreferences.getInstance();
    prefs.setString(_themeKey, themeName);
  }

  void toggleTheme(bool isDark) async {
    _isDarkMode = isDark;
    notifyListeners();

    final prefs = await SharedPreferences.getInstance();
    prefs.setBool(_darkModeKey, isDark);
  }

  // 🔽 [신규] 폰트 크기 변경
  void setTextScale(double scale) async {
    _textScaleFactor = scale;
    notifyListeners();
    final prefs = await SharedPreferences.getInstance();
    prefs.setDouble(_textScaleKey, scale);
  }
}