import 'package:flutter/material.dart';

/// Paleta y tema central de WasteNotify.
/// Inspirado en materiales naturales: verde bosque + tierra + blanco hueso.
/// Transmite confianza institucional y respeto ambiental.
abstract final class AppTheme {
  // --- Paleta de color ---
  static const Color forestGreen = Color(0xFF1B5E20);
  static const Color leafGreen = Color(0xFF2E7D32);
  static const Color mintGreen = Color(0xFF43A047);
  static const Color lightMint = Color(0xFFE8F5E9);
  static const Color earthBrown = Color(0xFF4E342E);
  static const Color sandBeige = Color(0xFFFFF8E1);
  static const Color warmWhite = Color(0xFFFAFAF7);
  static const Color charcoal = Color(0xFF212121);
  static const Color midGray = Color(0xFF757575);
  static const Color lightGray = Color(0xFFEEEEEE);
  static const Color alertAmber = Color(0xFFF57C00);
  static const Color errorRed = Color(0xFFC62828);

  static ThemeData get light {
    const colorScheme = ColorScheme(
      brightness: Brightness.light,
      primary: leafGreen,
      onPrimary: Colors.white,
      primaryContainer: lightMint,
      onPrimaryContainer: forestGreen,
      secondary: earthBrown,
      onSecondary: Colors.white,
      secondaryContainer: sandBeige,
      onSecondaryContainer: earthBrown,
      error: errorRed,
      onError: Colors.white,
      surface: warmWhite,
      onSurface: charcoal,
    );

    return ThemeData(
      useMaterial3: true,
      colorScheme: colorScheme,
      fontFamily: 'Georgia', // Serifed: transmite solidez institucional
      scaffoldBackgroundColor: warmWhite,
      appBarTheme: const AppBarTheme(
        backgroundColor: warmWhite,
        foregroundColor: charcoal,
        elevation: 0,
        scrolledUnderElevation: 1,
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          backgroundColor: leafGreen,
          foregroundColor: Colors.white,
          minimumSize: const Size(double.infinity, 54),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12),
          ),
          elevation: 3,
          shadowColor: leafGreen.withValues(alpha: 0.4),
          textStyle: const TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w700,
            letterSpacing: 0.5,
          ),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: Colors.white,
        contentPadding:
            const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: lightGray, width: 1.5),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: lightGray, width: 1.5),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: leafGreen, width: 2),
        ),
        errorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: errorRed, width: 1.5),
        ),
        focusedErrorBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: errorRed, width: 2),
        ),
        labelStyle: const TextStyle(color: midGray),
        hintStyle: TextStyle(color: midGray.withValues(alpha: 0.7)),
      ),
      cardTheme: CardThemeData(
        color: Colors.white,
        elevation: 2,
        shadowColor: Colors.black.withValues(alpha: 0.08),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16),
        ),
      ),
      snackBarTheme: SnackBarThemeData(
        backgroundColor: charcoal,
        contentTextStyle: const TextStyle(color: Colors.white, fontSize: 14),
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
        behavior: SnackBarBehavior.floating,
      ),
    );
  }
}