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

class AppTheme {
  // Warm Traditional Family Restaurant Brand Colors
  static const Color primary = Color(0xFF8A1C14); // Rich Brick/Crimson Red
  static const Color primaryContainer = Color(0xFF8A1C14);
  static const Color secondary = Color(0xFFB58428); // Warm Gold/Honey Amber
  static const Color secondaryContainer = Color(0xFFF3DCA2);
  static const Color tertiary = Color(0xFF4A7C59);  // Warm Sage/Forest Green
  static const Color tertiaryContainer = Color(0xFFCCE8D6); // Soft sage tint
  static const Color onPrimaryContainer = Colors.white;
  static const Color onSecondaryContainer = Color(0xFF5A3E00);
  static const Color onTertiary = Colors.white;
  static const Color onTertiaryContainer = Color(0xFF0D3320); // Deep forest text

  // Warm Ivory & Earthy Surface Hierarchy
  static const Color surface = Color(0xFFFAF6EE); // Warm paper ivory background
  static const Color surfaceContainer = Color(0xFFF2EAD8); // Soft cream
  static const Color surfaceContainerLow = Color(0xFFF7F1E3); // Milky cream
  static const Color surfaceContainerLowest = Color(0xFFFCFAF6); // Softest ivory/white
  static const Color surfaceContainerHighest = Color(0xFFE5D5BA); // Warm toasted sand

  // Text & On-Colors
  static const Color onSurface = Color(0xFF2E251B); // Earthy dark brown instead of charcoal
  static const Color onSurfaceVariant = Color(0xFF635647); // Subdued warm wood tone
  static const Color onPrimary = Colors.white;
  static const Color outlineVariant = Color(0xFFD3C5B1); // Soft sandy divider

  static ThemeData get lightTheme => getTheme();

  static ThemeData getTheme({Color? primaryColor, Color? secondaryColor, Color? tertiaryColor, Color? backgroundColor}) {
    final baseTheme = ThemeData.light();
    final pColor = primaryColor ?? primary;
    final sColor = secondaryColor ?? secondary;
    final tColor = tertiaryColor ?? tertiary;
    final bg = backgroundColor ?? surface;

    // Dynamically compute readable contrast text colors
    final onPrimaryColor = pColor.computeLuminance() > 0.5 ? const Color(0xFF2E251B) : Colors.white;
    final onSecondaryColor = sColor.computeLuminance() > 0.5 ? const Color(0xFF2E251B) : Colors.white;
    final onTertiaryColor = tColor.computeLuminance() > 0.5 ? const Color(0xFF2E251B) : Colors.white;
    // Tertiary container: a desaturated/lightened tint of the tertiary color
    final tContainerColor = Color.lerp(tColor, Colors.white, 0.75) ?? tertiaryContainer;
    final onTertiaryContainerColor = tColor.computeLuminance() > 0.5
        ? const Color(0xFF2E251B)
        : Color.lerp(tColor, Colors.black, 0.7) ?? onTertiaryContainer;

    final isWhiteBg = bg.r > 0.98 && bg.g > 0.98 && bg.b > 0.98;
    final lowestColor = isWhiteBg ? const Color(0xFFFCFAF7) : const Color(0xFFFCFAF6);
    final lowColor = isWhiteBg ? const Color(0xFFF5F3ED) : const Color(0xFFF7F1E3);
    final containerColor = isWhiteBg ? const Color(0xFFEDEAE1) : const Color(0xFFF2EAD8);
    final highColor = isWhiteBg ? const Color(0xFFE2DDD2) : const Color(0xFFE5D5BA);

    return ThemeData(
      useMaterial3: true,
      scaffoldBackgroundColor: bg,
      colorScheme: ColorScheme.light(
        primary: pColor,
        primaryContainer: pColor,
        onPrimary: onPrimaryColor,
        secondary: sColor,
        secondaryContainer: sColor.withValues(alpha: 0.15),
        onSecondary: onSecondaryColor,
        onSecondaryContainer: onSecondaryColor,
        tertiary: tColor,
        tertiaryContainer: tContainerColor,
        onTertiary: onTertiaryColor,
        onTertiaryContainer: onTertiaryContainerColor,
        surface: bg,
        surfaceContainerLowest: lowestColor,
        surfaceContainerLow: lowColor,
        surfaceContainer: containerColor,
        surfaceContainerHigh: highColor,
        onSurface: onSurface,
        onSurfaceVariant: onSurfaceVariant,
        error: const Color(0xFFB02500),
      ),
      textTheme: baseTheme.textTheme.copyWith(
        displayLarge: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.bold,
          letterSpacing: -0.01,
        ),
        displayMedium: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.bold,
          letterSpacing: -0.01,
        ),
        displaySmall: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.bold,
          letterSpacing: -0.01,
        ),
        headlineMedium: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.bold,
          letterSpacing: -0.01,
        ),
        titleLarge: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.bold,
        ),
        titleMedium: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.bold,
        ),
        titleSmall: GoogleFonts.lora(
          color: onSurface,
          fontWeight: FontWeight.w600,
        ),
        bodyLarge: GoogleFonts.manrope(
          color: onSurface,
          letterSpacing: 0.1,
        ),
        bodyMedium: GoogleFonts.manrope(
          color: onSurfaceVariant,
          letterSpacing: 0.1,
        ),
        bodySmall: GoogleFonts.manrope(
          color: onSurfaceVariant,
          letterSpacing: 0.1,
        ),
        labelLarge: GoogleFonts.manrope(
          color: onSurfaceVariant,
          fontWeight: FontWeight.w600,
        ),
      ),
      elevatedButtonTheme: ElevatedButtonThemeData(
        style: ElevatedButton.styleFrom(
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(28), // Elegant pill buttons
          ),
          foregroundColor: onPrimaryColor,
          backgroundColor: pColor,
          elevation: 2,
          shadowColor: pColor.withValues(alpha: 0.2),
          padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 14),
        ),
      ),
      cardTheme: CardThemeData(
        color: surfaceContainerLow,
        elevation: 1,
        shadowColor: Colors.black.withValues(alpha: 0.05),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16), // Softer warm card corners
        ),
        margin: EdgeInsets.zero,
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: surfaceContainer,
        contentPadding: const EdgeInsets.symmetric(horizontal: 20, vertical: 16),
        border: OutlineInputBorder(
          borderSide: BorderSide.none,
          borderRadius: BorderRadius.circular(12),
        ),
        enabledBorder: OutlineInputBorder(
          borderSide: BorderSide.none,
          borderRadius: BorderRadius.circular(12),
        ),
        focusedBorder: OutlineInputBorder(
          borderSide: BorderSide(color: pColor.withValues(alpha: 0.5), width: 1.5),
          borderRadius: BorderRadius.circular(12),
        ),
        labelStyle: const TextStyle(color: onSurfaceVariant),
        hintStyle: GoogleFonts.manrope(color: onSurfaceVariant),
      ),
      appBarTheme: AppBarTheme(
        backgroundColor: surface,
        foregroundColor: onSurface,
        elevation: 0,
        surfaceTintColor: Colors.transparent,
        centerTitle: true,
        titleTextStyle: GoogleFonts.lora(
          color: onSurface,
          fontSize: 21,
          fontWeight: FontWeight.bold,
          letterSpacing: -0.01,
        ),
      ),
    );
  }
}