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

/// Nanga Kathai palette (same as the app, lib/app/theme.dart).
abstract final class NkColors {
  static const ground = Color(0xFF0B1A14);
  static const surface = Color(0xFF14281F);
  static const raised = Color(0xFF1F3A2B);
  static const outline = Color(0xFF2A4537);
  static const teaLeaf = Color(0xFF7FA857);
  static const sun = Color(0xFFF5B335);
  static const roofRed = Color(0xFFC9502F);
  static const cream = Color(0xFFFBF7EE);
  static const muted = Color(0xFF9FB3A6);
  static const info = Color(0xFF6FA8C9);
}

ThemeData buildNkTheme() {
  final base = ThemeData(
    useMaterial3: true,
    brightness: Brightness.dark,
    scaffoldBackgroundColor: NkColors.ground,
    colorScheme: const ColorScheme.dark(
      primary: NkColors.sun,
      onPrimary: NkColors.ground,
      secondary: NkColors.teaLeaf,
      surface: NkColors.ground,
      onSurface: NkColors.cream,
      surfaceContainer: NkColors.surface,
      surfaceContainerHigh: NkColors.raised,
      surfaceContainerHighest: NkColors.raised,
      outline: NkColors.outline,
      outlineVariant: NkColors.outline,
      error: NkColors.roofRed,
    ),
  );

  final body = base.textTheme.apply(
    fontFamily: GoogleFonts.manrope().fontFamily,
    bodyColor: NkColors.cream,
    displayColor: NkColors.cream,
  );
  TextStyle display(double size, [FontWeight w = FontWeight.w800]) =>
      GoogleFonts.sora(fontSize: size, fontWeight: w, color: NkColors.cream, height: 1.15);
  OutlineInputBorder border(Color c) =>
      OutlineInputBorder(borderRadius: BorderRadius.circular(12), borderSide: BorderSide(color: c, width: 1.5));

  return base.copyWith(
    textTheme: body.copyWith(
      headlineMedium: display(28),
      headlineSmall: display(22),
      titleLarge: display(18, FontWeight.w700),
      titleMedium: body.titleMedium?.copyWith(fontWeight: FontWeight.w700),
      bodySmall: body.bodySmall?.copyWith(color: NkColors.muted),
    ),
    filledButtonTheme: FilledButtonThemeData(
      style: FilledButton.styleFrom(
        backgroundColor: NkColors.sun,
        foregroundColor: NkColors.ground,
        minimumSize: const Size(64, 44),
        shape: const StadiumBorder(),
        textStyle: GoogleFonts.manrope(fontSize: 15, fontWeight: FontWeight.w700),
      ),
    ),
    outlinedButtonTheme: OutlinedButtonThemeData(
      style: OutlinedButton.styleFrom(
        foregroundColor: NkColors.cream,
        minimumSize: const Size(64, 42),
        side: const BorderSide(color: NkColors.outline, width: 1.5),
        shape: const StadiumBorder(),
        textStyle: GoogleFonts.manrope(fontSize: 14, fontWeight: FontWeight.w700),
      ),
    ),
    textButtonTheme: TextButtonThemeData(
      style: TextButton.styleFrom(
        foregroundColor: NkColors.sun,
        textStyle: GoogleFonts.manrope(fontWeight: FontWeight.w700),
      ),
    ),
    inputDecorationTheme: InputDecorationTheme(
      filled: true,
      fillColor: NkColors.surface,
      isDense: true,
      hintStyle: const TextStyle(color: NkColors.muted),
      labelStyle: const TextStyle(color: NkColors.muted),
      border: border(NkColors.outline),
      enabledBorder: border(NkColors.outline),
      focusedBorder: border(NkColors.sun),
    ),
    chipTheme: base.chipTheme.copyWith(
      backgroundColor: NkColors.raised,
      selectedColor: NkColors.sun,
      side: BorderSide.none,
      shape: const StadiumBorder(),
      labelStyle: GoogleFonts.manrope(fontWeight: FontWeight.w600, color: NkColors.cream),
      secondaryLabelStyle: GoogleFonts.manrope(fontWeight: FontWeight.w700, color: NkColors.ground),
      showCheckmark: false,
    ),
    cardTheme: CardThemeData(
      color: NkColors.surface,
      elevation: 0,
      margin: EdgeInsets.zero,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(16),
        side: const BorderSide(color: NkColors.outline),
      ),
    ),
    dialogTheme: DialogThemeData(
      backgroundColor: NkColors.surface,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
    ),
    dividerTheme: const DividerThemeData(color: NkColors.outline, space: 1),
    navigationRailTheme: NavigationRailThemeData(
      backgroundColor: NkColors.surface,
      indicatorColor: NkColors.raised,
      selectedIconTheme: const IconThemeData(color: NkColors.sun),
      unselectedIconTheme: const IconThemeData(color: NkColors.muted),
      selectedLabelTextStyle: GoogleFonts.manrope(color: NkColors.sun, fontWeight: FontWeight.w700),
      unselectedLabelTextStyle: GoogleFonts.manrope(color: NkColors.muted, fontWeight: FontWeight.w600),
    ),
    checkboxTheme: CheckboxThemeData(
      fillColor: WidgetStateProperty.resolveWith((s) => s.contains(WidgetState.selected) ? NkColors.sun : null),
      checkColor: const WidgetStatePropertyAll(NkColors.ground),
    ),
    snackBarTheme: const SnackBarThemeData(
      backgroundColor: NkColors.raised,
      contentTextStyle: TextStyle(color: NkColors.cream),
      behavior: SnackBarBehavior.floating,
      width: 420,
    ),
  );
}