/// Mindful Values Architecture theme — warm surfaces with high-contrast type.
library;

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

/// Builds [ThemeData] tuned for readable contrast on warm paper surfaces.
abstract final class AppTheme {
  /// Page canvas — light paper, clearly lighter than elevated cards.
  static const Color surface = Color(0xFFFFFBF5);

  /// Elevated cards / sheets — distinct from the canvas.
  static const Color surfaceContainerLow = Color(0xFFFFFFFF);
  static const Color surfaceContainer = Color(0xFFF3EDE4);
  static const Color surfaceContainerHigh = Color(0xFFE9E2D7);
  static const Color surfaceContainerHighest = Color(0xFFDED6C9);

  /// Near-black espresso for primary copy (≈16:1 on surface).
  static const Color onSurface = Color(0xFF1A1612);

  /// Secondary copy — still strong on cream (≈9:1).
  static const Color onSurfaceVariant = Color(0xFF3F3832);

  /// Icons / meta — darker than the old stone grey.
  static const Color outline = Color(0xFF5C534B);
  static const Color outlineVariant = Color(0xFFC4B8AA);

  static const Color primary = Color(0xFF4F4032);
  static const Color primaryContainer = Color(0xFF6B5848);
  static const Color onPrimary = Color(0xFFFFFBF5);
  static const Color secondary = Color(0xFF8A3F1C);
  static const Color secondaryContainer = Color(0xFFFFD4BC);
  static const Color tertiary = Color(0xFF3A5238);
  static const Color inverseSurface = Color(0xFF25211D);

  static ThemeData light() {
    const colorScheme = ColorScheme(
      brightness: Brightness.light,
      primary: primary,
      onPrimary: onPrimary,
      primaryContainer: primaryContainer,
      onPrimaryContainer: Color(0xFFFFF3E8),
      secondary: secondary,
      onSecondary: onPrimary,
      secondaryContainer: secondaryContainer,
      onSecondaryContainer: Color(0xFF4A1E08),
      tertiary: tertiary,
      onTertiary: onPrimary,
      tertiaryContainer: Color(0xFF5A7358),
      onTertiaryContainer: Color(0xFFEAF6E7),
      error: Color(0xFFB3261E),
      onError: onPrimary,
      errorContainer: Color(0xFFFFDAD6),
      onErrorContainer: Color(0xFF410002),
      surface: surface,
      onSurface: onSurface,
      surfaceContainerHighest: surfaceContainerHighest,
      surfaceContainerHigh: surfaceContainerHigh,
      surfaceContainer: surfaceContainer,
      surfaceContainerLow: surfaceContainerLow,
      surfaceContainerLowest: Color(0xFFFFFFFF),
      onSurfaceVariant: onSurfaceVariant,
      outline: outline,
      outlineVariant: outlineVariant,
      inverseSurface: inverseSurface,
      onInverseSurface: Color(0xFFF7F1E8),
      inversePrimary: Color(0xFFDCC4A8),
      shadow: Color(0xFF1A1612),
      scrim: Color(0xFF1A1612),
    );

    final textTheme = _textTheme(colorScheme);

    return ThemeData(
      useMaterial3: true,
      colorScheme: colorScheme,
      textTheme: textTheme,
      scaffoldBackgroundColor: surface,
      appBarTheme: AppBarTheme(
        centerTitle: false,
        elevation: 0,
        scrolledUnderElevation: 0,
        backgroundColor: surface,
        foregroundColor: onSurface,
        titleTextStyle: textTheme.titleLarge,
      ),
      cardTheme: CardThemeData(
        elevation: 0,
        color: surfaceContainerLow,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(24),
          side: const BorderSide(color: outlineVariant, width: 1.2),
        ),
        clipBehavior: Clip.antiAlias,
        margin: EdgeInsets.zero,
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: Colors.white,
        hintStyle: textTheme.bodyMedium?.copyWith(
          color: outline.withValues(alpha: 0.85),
        ),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: const BorderSide(color: outlineVariant, width: 1.2),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: const BorderSide(color: outlineVariant, width: 1.2),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: const BorderSide(color: primary, width: 1.8),
        ),
        contentPadding: const EdgeInsets.symmetric(
          horizontal: 16,
          vertical: 14,
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          minimumSize: const Size.fromHeight(52),
          backgroundColor: primary,
          foregroundColor: onPrimary,
          shape: const StadiumBorder(),
          textStyle: textTheme.labelLarge?.copyWith(color: onPrimary),
          elevation: 0,
        ),
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: onSurface,
          textStyle: textTheme.labelMedium?.copyWith(
            color: onSurface,
            fontWeight: FontWeight.w600,
          ),
          shape: const StadiumBorder(),
        ),
      ),
      chipTheme: ChipThemeData(
        backgroundColor: Colors.white,
        selectedColor: surfaceContainerHigh,
        side: const BorderSide(color: outlineVariant, width: 1.2),
        shape: const StadiumBorder(),
        labelStyle: textTheme.labelMedium?.copyWith(color: onSurface),
        secondaryLabelStyle: textTheme.labelMedium?.copyWith(color: onSurface),
        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 2),
      ),
      bottomSheetTheme: const BottomSheetThemeData(
        backgroundColor: surfaceContainerLow,
        surfaceTintColor: Colors.transparent,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(32)),
        ),
        showDragHandle: true,
      ),
      dividerTheme: const DividerThemeData(
        color: outlineVariant,
        space: 1,
        thickness: 1,
      ),
      listTileTheme: const ListTileThemeData(
        textColor: onSurface,
        iconColor: onSurfaceVariant,
      ),
      snackBarTheme: SnackBarThemeData(
        behavior: SnackBarBehavior.floating,
        backgroundColor: inverseSurface,
        contentTextStyle: textTheme.bodyMedium?.copyWith(
          color: const Color(0xFFF7F1E8),
        ),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(16),
        ),
      ),
    );
  }

  /// Soft dark mirror — elevated cards stay darker than text for contrast.
  static ThemeData dark() {
    const darkScheme = ColorScheme(
      brightness: Brightness.dark,
      primary: Color(0xFFE2CDB6),
      onPrimary: Color(0xFF2A2118),
      primaryContainer: Color(0xFF6B5848),
      onPrimaryContainer: Color(0xFFFFF3E8),
      secondary: Color(0xFFFFB691),
      onSecondary: Color(0xFF4A1E08),
      secondaryContainer: Color(0xFF6B3014),
      onSecondaryContainer: Color(0xFFFFD4BC),
      tertiary: Color(0xFFB5CDB0),
      onTertiary: Color(0xFF1A2A1A),
      tertiaryContainer: Color(0xFF3A5238),
      onTertiaryContainer: Color(0xFFEAF6E7),
      error: Color(0xFFFFB4AB),
      onError: Color(0xFF690005),
      errorContainer: Color(0xFF93000A),
      onErrorContainer: Color(0xFFFFDAD6),
      surface: Color(0xFF161310),
      onSurface: Color(0xFFF5EFE6),
      surfaceContainerHighest: Color(0xFF3A342E),
      surfaceContainerHigh: Color(0xFF302B26),
      surfaceContainer: Color(0xFF26221E),
      surfaceContainerLow: Color(0xFF221E1A),
      surfaceContainerLowest: Color(0xFF0E0C0A),
      onSurfaceVariant: Color(0xFFD9CEC2),
      outline: Color(0xFFB0A397),
      outlineVariant: Color(0xFF4A433C),
      inverseSurface: Color(0xFFF5EFE6),
      onInverseSurface: Color(0xFF1C1916),
      inversePrimary: Color(0xFF4F4032),
      shadow: Color(0xFF000000),
      scrim: Color(0xFF000000),
    );

    final textTheme = _textTheme(darkScheme);
    return ThemeData(
      useMaterial3: true,
      colorScheme: darkScheme,
      textTheme: textTheme,
      scaffoldBackgroundColor: darkScheme.surface,
      appBarTheme: AppBarTheme(
        centerTitle: false,
        elevation: 0,
        scrolledUnderElevation: 0,
        backgroundColor: darkScheme.surface,
        foregroundColor: darkScheme.onSurface,
        titleTextStyle: textTheme.titleLarge,
      ),
      cardTheme: CardThemeData(
        elevation: 0,
        color: darkScheme.surfaceContainerLow,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(24),
          side: BorderSide(color: darkScheme.outlineVariant, width: 1.2),
        ),
      ),
      inputDecorationTheme: InputDecorationTheme(
        filled: true,
        fillColor: darkScheme.surfaceContainer,
        hintStyle: textTheme.bodyMedium?.copyWith(
          color: darkScheme.outline.withValues(alpha: 0.9),
        ),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: BorderSide(color: darkScheme.outlineVariant, width: 1.2),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: BorderSide(color: darkScheme.outlineVariant, width: 1.2),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(16),
          borderSide: BorderSide(color: darkScheme.primary, width: 1.8),
        ),
        contentPadding: const EdgeInsets.symmetric(
          horizontal: 16,
          vertical: 14,
        ),
      ),
      filledButtonTheme: FilledButtonThemeData(
        style: FilledButton.styleFrom(
          minimumSize: const Size.fromHeight(52),
          backgroundColor: darkScheme.primary,
          foregroundColor: darkScheme.onPrimary,
          shape: const StadiumBorder(),
          textStyle: textTheme.labelLarge?.copyWith(color: darkScheme.onPrimary),
          elevation: 0,
        ),
      ),
      textButtonTheme: TextButtonThemeData(
        style: TextButton.styleFrom(
          foregroundColor: darkScheme.onSurface,
          textStyle: textTheme.labelMedium?.copyWith(
            color: darkScheme.onSurface,
            fontWeight: FontWeight.w600,
          ),
          shape: const StadiumBorder(),
        ),
      ),
      chipTheme: ChipThemeData(
        backgroundColor: darkScheme.surfaceContainer,
        selectedColor: darkScheme.surfaceContainerHigh,
        side: BorderSide(color: darkScheme.outlineVariant, width: 1.2),
        shape: const StadiumBorder(),
        labelStyle: textTheme.labelMedium?.copyWith(color: darkScheme.onSurface),
        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 2),
      ),
      bottomSheetTheme: BottomSheetThemeData(
        backgroundColor: darkScheme.surfaceContainerLow,
        surfaceTintColor: Colors.transparent,
        shape: const RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(32)),
        ),
        showDragHandle: true,
      ),
      listTileTheme: ListTileThemeData(
        textColor: darkScheme.onSurface,
        iconColor: darkScheme.onSurfaceVariant,
      ),
    );
  }

  static TextTheme _textTheme(ColorScheme colors) {
    final newsreader = GoogleFonts.newsreaderTextTheme();
    final jakarta = GoogleFonts.plusJakartaSansTextTheme();

    return TextTheme(
      displaySmall: newsreader.displaySmall?.copyWith(
        fontSize: 32,
        height: 40 / 32,
        fontWeight: FontWeight.w500,
        letterSpacing: -0.32,
        color: colors.onSurface,
      ),
      headlineMedium: newsreader.headlineMedium?.copyWith(
        fontSize: 26,
        height: 34 / 26,
        fontWeight: FontWeight.w500,
        color: colors.onSurface,
      ),
      headlineSmall: newsreader.headlineSmall?.copyWith(
        fontSize: 22,
        height: 30 / 22,
        fontWeight: FontWeight.w500,
        color: colors.onSurface,
      ),
      titleLarge: newsreader.titleLarge?.copyWith(
        fontSize: 22,
        height: 30 / 22,
        fontWeight: FontWeight.w500,
        color: colors.onSurface,
      ),
      titleMedium: jakarta.titleMedium?.copyWith(
        fontSize: 16,
        fontWeight: FontWeight.w700,
        color: colors.onSurface,
      ),
      bodyLarge: jakarta.bodyLarge?.copyWith(
        fontSize: 16,
        height: 24 / 16,
        fontWeight: FontWeight.w500,
        color: colors.onSurface,
      ),
      bodyMedium: jakarta.bodyMedium?.copyWith(
        fontSize: 14,
        height: 20 / 14,
        fontWeight: FontWeight.w500,
        color: colors.onSurfaceVariant,
      ),
      bodySmall: jakarta.bodySmall?.copyWith(
        fontSize: 12,
        height: 16 / 12,
        fontWeight: FontWeight.w500,
        color: colors.onSurfaceVariant,
      ),
      labelLarge: jakarta.labelLarge?.copyWith(
        fontSize: 15,
        height: 20 / 15,
        fontWeight: FontWeight.w700,
        letterSpacing: 0.15,
        color: colors.onPrimary,
      ),
      labelMedium: jakarta.labelMedium?.copyWith(
        fontSize: 13,
        height: 18 / 13,
        fontWeight: FontWeight.w600,
        letterSpacing: 0.2,
        color: colors.onSurfaceVariant,
      ),
      labelSmall: jakarta.labelSmall?.copyWith(
        fontSize: 11,
        height: 16 / 11,
        fontWeight: FontWeight.w700,
        letterSpacing: 0.4,
        color: colors.onSurfaceVariant,
      ),
    );
  }
}