lib/providers/theme_provider.dart

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

class ThemeProvider extends ChangeNotifier {
  static const String _themeKey = 'theme_mode';
  
  ThemeMode _themeMode = ThemeMode.dark; // Default to dark theme (ATLES style)
  
  ThemeMode get themeMode => _themeMode;
  
  // ATLES Dark Theme
  ThemeData get darkTheme => ThemeData(
    useMaterial3: true,
    brightness: Brightness.dark,
    colorScheme: const ColorScheme.dark(
      primary: Color(0xFF00D4FF), // ATLES cyan
      secondary: Color(0xFF7C4DFF), // ATLES purple
      surface: Color(0xFF1A1A1A), // Dark background
      background: Color(0xFF121212), // Darker background
      onPrimary: Colors.black,
      onSecondary: Colors.white,
      onSurface: Colors.white,
      onBackground: Colors.white,
    ),
    appBarTheme: const AppBarTheme(
      backgroundColor: Color(0xFF1A1A1A),
      foregroundColor: Colors.white,
      elevation: 0,
    ),
    cardTheme: CardTheme(
      color: const Color(0xFF2A2A2A),
      elevation: 4,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
      ),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        backgroundColor: const Color(0xFF00D4FF),
        foregroundColor: Colors.black,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
      ),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: const Color(0xFF2A2A2A),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: BorderSide.none,
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: const BorderSide(color: Color(0xFF00D4FF)),
      ),
    ),
  );
  
  // ATLES Light Theme
  ThemeData get lightTheme => ThemeData(
    useMaterial3: true,
    brightness: Brightness.light,
    colorScheme: const ColorScheme.light(
      primary: Color(0xFF0066CC), // ATLES blue
      secondary: Color(0xFF6200EA), // ATLES purple
      surface: Color(0xFFF5F5F5), // Light background
      background: Colors.white,
      onPrimary: Colors.white,
      onSecondary: Colors.white,
      onSurface: Colors.black,
      onBackground: Colors.black,
    ),
    appBarTheme: const AppBarTheme(
      backgroundColor: Color(0xFFF5F5F5),
      foregroundColor: Colors.black,
      elevation: 0,
    ),
    cardTheme: CardTheme(
      color: Colors.white,
      elevation: 2,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(12),
      ),
    ),
    elevatedButtonTheme: ElevatedButtonThemeData(
      style: ElevatedButton.styleFrom(
        backgroundColor: const Color(0xFF0066CC),
        foregroundColor: Colors.white,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(8),
        ),
      ),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: const Color(0xFFF5F5F5),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: BorderSide.none,
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(8),
        borderSide: const BorderSide(color: Color(0xFF0066CC)),
      ),
    ),
  );
  
  ThemeProvider() {
    _loadTheme();
  }
  
  void toggleTheme() {
    _themeMode = _themeMode == ThemeMode.dark 
        ? ThemeMode.light 
        : ThemeMode.dark;
    _saveTheme();
    notifyListeners();
  }
  
  void setTheme(ThemeMode mode) {
    _themeMode = mode;
    _saveTheme();
    notifyListeners();
  }
  
  Future<void> _loadTheme() async {
    final prefs = await SharedPreferences.getInstance();
    final themeIndex = prefs.getInt(_themeKey) ?? 2; // Default to dark
    _themeMode = ThemeMode.values[themeIndex];
    notifyListeners();
  }
  
  Future<void> _saveTheme() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setInt(_themeKey, _themeMode.index);
  }
}