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

class AppTheme {
  // Mapan Core Tokens
  static const Color primary = Color(0xFFB20000);
  static const Color primaryContainer = Color(0xFFE00101);
  static const Color secondary = Color(0xFF825500);
  static const Color secondaryContainer = Color(0xFFFEB23D);
  static const Color onSecondaryContainer = Color(0xFF6E4700);
  
  // Surface Hierarchy
  static const Color surface = Color(0xFFFCF9F8);
  static const Color surfaceContainer = Color(0xFFF0EDED);
  static const Color surfaceContainerLow = Color(0xFFF6F3F2);
  static const Color surfaceContainerHighest = Color(0xFFE5E2E1);
  
  // Text & On-Colors
  static const Color onSurface = Color(0xFF1C1B1B);
  static const Color onSurfaceVariant = Color(0xFF5E3F3A);
  static const Color onPrimary = Colors.white;

  /// The Signature 135-degree CTA Gradient for main buttons.
  static const LinearGradient primaryGradient = LinearGradient(
    colors: [primary, primaryContainer],
    begin: Alignment.topLeft,
    end: Alignment.bottomRight, // Approximation of 135 degrees
  );

  static ThemeData get lightTheme {
    final baseTheme = ThemeData.light();

    return ThemeData(
      useMaterial3: true,
      scaffoldBackgroundColor: surface,
      colorScheme: const ColorScheme.light(
        primary: primary,
        primaryContainer: primaryContainer,
        secondary: secondary,
        secondaryContainer: secondaryContainer,
        onSecondaryContainer: onSecondaryContainer,
        surface: surface,
        onSurface: onSurface,
        onSurfaceVariant: onSurfaceVariant,
        onPrimary: onPrimary,
        error: Color(0xFFBA1A1A),
      ),
      textTheme: baseTheme.textTheme.copyWith(
        displayLarge: GoogleFonts.plusJakartaSans(color: onSurface, fontWeight: FontWeight.bold, letterSpacing: -0.5),
        displayMedium: GoogleFonts.plusJakartaSans(color: onSurface, fontWeight: FontWeight.bold),
        displaySmall: GoogleFonts.plusJakartaSans(color: onSurface, fontWeight: FontWeight.bold),
        headlineMedium: GoogleFonts.plusJakartaSans(color: onSurface, fontWeight: FontWeight.bold),
        titleLarge: GoogleFonts.beVietnamPro(color: onSurface, fontWeight: FontWeight.w600),
        titleMedium: GoogleFonts.beVietnamPro(color: onSurface, fontWeight: FontWeight.w600),
        titleSmall: GoogleFonts.beVietnamPro(color: onSurface, fontWeight: FontWeight.w500),
        bodyLarge: GoogleFonts.beVietnamPro(color: onSurfaceVariant),
        bodyMedium: GoogleFonts.beVietnamPro(color: onSurfaceVariant),
        bodySmall: GoogleFonts.beVietnamPro(color: onSurfaceVariant),
        labelLarge: GoogleFonts.beVietnamPro(color: onSurfaceVariant),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
          foregroundColor: onPrimary,
          backgroundColor: primaryContainer, // Fallback if no gradient is used
          elevation: 0,
        ),
      ),
      cardTheme: CardThemeData(
        color: surfaceContainerLow,
        elevation: 0, // Depth created via tonal shifts
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        margin: EdgeInsets.zero,
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: surfaceContainerHighest,
        // Using "Ghost Border" logic at 15% opacity
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: Color(0x26946E68)), 
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: const BorderSide(color: Color(0x26946E68)),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(12),
          borderSide: BorderSide(color: primary.withOpacity(0.4), width: 2),
        ),
        labelStyle: const TextStyle(color: onSurfaceVariant),
      ),
      appBarTheme: AppBarTheme(
        backgroundColor: surface,
        foregroundColor: onSurface,
        elevation: 0,
        surfaceTintColor: Colors.transparent,
        titleTextStyle: GoogleFonts.plusJakartaSans(
          color: onSurface, 
          fontSize: 20, 
          fontWeight: FontWeight.bold
        ),
      ),
    );
  }
}