import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../constants/app_constants.dart';

/// Application theme configuration using Material Design 3
class AppTheme {
  AppTheme._();

  // Color scheme for light theme
  static const ColorScheme _lightColorScheme = ColorScheme(
    brightness: Brightness.light,
    primary: Color(0xFF1976D2), // Blue
    onPrimary: Color(0xFFFFFFFF),
    primaryContainer: Color(0xFFE3F2FD),
    onPrimaryContainer: Color(0xFF0D47A1),
    secondary: Color(0xFF757575), // Grey
    onSecondary: Color(0xFFFFFFFF),
    secondaryContainer: Color(0xFFE0E0E0),
    onSecondaryContainer: Color(0xFF424242),
    tertiary: Color(0xFF4CAF50), // Green
    onTertiary: Color(0xFFFFFFFF),
    tertiaryContainer: Color(0xFFE8F5E8),
    onTertiaryContainer: Color(0xFF2E7D32),
    error: Color(0xFFD32F2F),
    onError: Color(0xFFFFFFFF),
    errorContainer: Color(0xFFFFEBEE),
    onErrorContainer: Color(0xFFB71C1C),
    surface: Color(0xFFFFFFFF),
    onSurface: Color(0xFF212121),
    background: Color(0xFFF5F5F5),
    onBackground: Color(0xFF616161),
    onSurfaceVariant: Color(0xFF616161),
    outline: Color(0xFFBDBDBD),
    outlineVariant: Color(0xFFE0E0E0),
    shadow: Color(0xFF000000),
    scrim: Color(0xFF000000),
    inverseSurface: Color(0xFF303030),
    onInverseSurface: Color(0xFFF5F5F5),
    inversePrimary: Color(0xFF90CAF9),
    surfaceTint: Color(0xFF1976D2),
  );

  // Color scheme for dark theme
  static const ColorScheme _darkColorScheme = ColorScheme(
    brightness: Brightness.dark,
    primary: Color(0xFF90CAF9), // Light Blue
    onPrimary: Color(0xFF0D47A1),
    primaryContainer: Color(0xFF1565C0),
    onPrimaryContainer: Color(0xFFE3F2FD),
    secondary: Color(0xFFBDBDBD), // Light Grey
    onSecondary: Color(0xFF424242),
    secondaryContainer: Color(0xFF616161),
    onSecondaryContainer: Color(0xFFE0E0E0),
    tertiary: Color(0xFF81C784), // Light Green
    onTertiary: Color(0xFF2E7D32),
    tertiaryContainer: Color(0xFF388E3C),
    onTertiaryContainer: Color(0xFFE8F5E8),
    error: Color(0xFFEF5350),
    onError: Color(0xFFB71C1C),
    errorContainer: Color(0xFFD32F2F),
    onErrorContainer: Color(0xFFFFEBEE),
    surface: Color(0xFF121212),
    onSurface: Color(0xFFE0E0E0),
    background: Color(0xFF2C2C2C),
    onBackground: Color(0xFFBDBDBD),
    onSurfaceVariant: Color(0xFFBDBDBD),
    outline: Color(0xFF757575),
    outlineVariant: Color(0xFF424242),
    shadow: Color(0xFF000000),
    scrim: Color(0xFF000000),
    inverseSurface: Color(0xFFE0E0E0),
    onInverseSurface: Color(0xFF303030),
    inversePrimary: Color(0xFF1976D2),
    surfaceTint: Color(0xFF90CAF9),
  );

  /// Light theme configuration
  static ThemeData get lightTheme {
    return ThemeData(
      useMaterial3: true,
      colorScheme: _lightColorScheme,
      scaffoldBackgroundColor: _lightColorScheme.surface,

      // App Bar Theme
      appBarTheme: AppBarTheme(
        elevation: 0,
        scrolledUnderElevation: 1,
        backgroundColor: _lightColorScheme.surface,
        foregroundColor: _lightColorScheme.onSurface,
        titleTextStyle: TextStyle(
          fontSize: 20,
          fontWeight: FontWeight.w600,
          color: _lightColorScheme.onSurface,
        ),
        systemOverlayStyle: SystemUiOverlayStyle.dark,
      ),

      // Elevated Button Theme
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          elevation: 0,
          minimumSize: const Size(double.infinity, AppConstants.buttonHeight),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          ),
          textStyle: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
          ),
        ),
      ),

      // Text Button Theme
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          minimumSize: const Size(double.infinity, AppConstants.buttonHeight),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          ),
          textStyle: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
          ),
        ),
      ),

      // Input Decoration Theme
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: _lightColorScheme.background,
        contentPadding: const EdgeInsets.all(AppConstants.defaultPadding),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _lightColorScheme.outline),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _lightColorScheme.outline),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _lightColorScheme.primary, width: 2),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _lightColorScheme.error),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _lightColorScheme.error, width: 2),
        ),
        labelStyle: TextStyle(color: _lightColorScheme.onSurfaceVariant),
        hintStyle: TextStyle(color: _lightColorScheme.onSurfaceVariant),
      ),


      // List Tile Theme
      listTileTheme: const ListTileThemeData(
        contentPadding: EdgeInsets.symmetric(
          horizontal: AppConstants.defaultPadding,
          vertical: AppConstants.smallPadding,
        ),
      ),

      // Divider Theme
      dividerTheme: DividerThemeData(
        color: _lightColorScheme.outline,
        thickness: 0.5,
      ),

      // Progress Indicator Theme
      progressIndicatorTheme: ProgressIndicatorThemeData(
        color: _lightColorScheme.primary,
      ),

      // Snack Bar Theme
      snackBarTheme: SnackBarThemeData(
        backgroundColor: _lightColorScheme.inverseSurface,
        contentTextStyle: TextStyle(color: _lightColorScheme.onInverseSurface),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
        ),
        behavior: SnackBarBehavior.floating,
      ),
    );
  }

  /// Dark theme configuration
  static ThemeData get darkTheme {
    return ThemeData(
      useMaterial3: true,
      colorScheme: _darkColorScheme,
      scaffoldBackgroundColor: _darkColorScheme.surface,

      // App Bar Theme
      appBarTheme: AppBarTheme(
        elevation: 0,
        scrolledUnderElevation: 1,
        backgroundColor: _darkColorScheme.surface,
        foregroundColor: _darkColorScheme.onSurface,
        titleTextStyle: TextStyle(
          fontSize: 20,
          fontWeight: FontWeight.w600,
          color: _darkColorScheme.onSurface,
        ),
        systemOverlayStyle: SystemUiOverlayStyle.light,
      ),

      // Elevated Button Theme
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          elevation: 0,
          minimumSize: const Size(double.infinity, AppConstants.buttonHeight),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          ),
          textStyle: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
          ),
        ),
      ),

      // Text Button Theme
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          minimumSize: const Size(double.infinity, AppConstants.buttonHeight),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          ),
          textStyle: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
          ),
        ),
      ),

      // Input Decoration Theme
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: _darkColorScheme.background,
        contentPadding: const EdgeInsets.all(AppConstants.defaultPadding),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _darkColorScheme.outline),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _darkColorScheme.outline),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _darkColorScheme.primary, width: 2),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _darkColorScheme.error),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
          borderSide: BorderSide(color: _darkColorScheme.error, width: 2),
        ),
        labelStyle: TextStyle(color: _darkColorScheme.onSurfaceVariant),
        hintStyle: TextStyle(color: _darkColorScheme.onSurfaceVariant),
      ),


      // List Tile Theme
      listTileTheme: const ListTileThemeData(
        contentPadding: EdgeInsets.symmetric(
          horizontal: AppConstants.defaultPadding,
          vertical: AppConstants.smallPadding,
        ),
      ),

      // Divider Theme
      dividerTheme: DividerThemeData(
        color: _darkColorScheme.outline,
        thickness: 0.5,
      ),

      // Progress Indicator Theme
      progressIndicatorTheme: ProgressIndicatorThemeData(
        color: _darkColorScheme.primary,
      ),

      // Snack Bar Theme
      snackBarTheme: SnackBarThemeData(
        backgroundColor: _darkColorScheme.inverseSurface,
        contentTextStyle: TextStyle(color: _darkColorScheme.onInverseSurface),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(AppConstants.borderRadius),
        ),
        behavior: SnackBarBehavior.floating,
      ),
    );
  }
}