import 'package:flutter/material.dart';

abstract final class AppColors {
  static const primary = Color(0xFF4F46E5);
  static const canvas = Color(0xFFF8FAFC);
  static const ink = Color(0xFF0F172A);
  static const muted = Color(0xFF64748B);
  static const border = Color(0xFFE2E8F0);
  static const success = Color(0xFF10B981);
  static const warning = Color(0xFFF59E0B);
}

ThemeData buildAppTheme() {
  final scheme = ColorScheme.fromSeed(
    seedColor: AppColors.primary,
    brightness: Brightness.light,
    surface: Colors.white,
  );

  return ThemeData(
    useMaterial3: true,
    colorScheme: scheme,
    scaffoldBackgroundColor: AppColors.canvas,
    fontFamilyFallback: const [
      'Noto Sans CJK SC',
      'Noto Sans SC',
      'PingFang SC',
      'Microsoft YaHei',
      'sans-serif',
    ],
    textTheme: const TextTheme(
      headlineSmall: TextStyle(
        color: AppColors.ink,
        fontSize: 22,
        fontWeight: FontWeight.w800,
      ),
      titleLarge: TextStyle(
        color: AppColors.ink,
        fontSize: 18,
        fontWeight: FontWeight.w800,
      ),
      titleMedium: TextStyle(
        color: AppColors.ink,
        fontSize: 15,
        fontWeight: FontWeight.w700,
      ),
      bodyMedium: TextStyle(color: AppColors.ink, fontSize: 14, height: 1.5),
      bodySmall: TextStyle(color: AppColors.muted, fontSize: 12, height: 1.4),
    ),
    cardTheme: const CardThemeData(
      color: Colors.white,
      elevation: 0,
      margin: EdgeInsets.zero,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(24)),
        side: BorderSide(color: Color(0xFFF1F5F9)),
      ),
    ),
    inputDecorationTheme: const InputDecorationTheme(
      filled: true,
      fillColor: Colors.white,
      contentPadding: EdgeInsets.symmetric(horizontal: 16, vertical: 14),
      border: OutlineInputBorder(
        borderRadius: BorderRadius.all(Radius.circular(18)),
        borderSide: BorderSide(color: AppColors.border),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.all(Radius.circular(18)),
        borderSide: BorderSide(color: AppColors.border),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.all(Radius.circular(18)),
        borderSide: BorderSide(color: AppColors.primary, width: 1.5),
      ),
    ),
    snackBarTheme: const SnackBarThemeData(
      behavior: SnackBarBehavior.floating,
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.all(Radius.circular(16)),
      ),
    ),
    navigationBarTheme: NavigationBarThemeData(
      backgroundColor: Colors.white,
      indicatorColor: const Color(0xFFE0E7FF),
      height: 72,
      labelTextStyle: WidgetStateProperty.resolveWith((states) {
        return TextStyle(
          fontSize: 11,
          fontWeight: states.contains(WidgetState.selected)
              ? FontWeight.w700
              : FontWeight.w500,
          color: states.contains(WidgetState.selected)
              ? AppColors.primary
              : AppColors.muted,
        );
      }),
    ),
  );
}