import 'package:flutter/material.dart';
import 'package:flutter_lucide/flutter_lucide.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_spacing.dart';
import '../../core/theme/app_typography.dart';
import 'credits_badge.dart';

/// Top navigation bar - matches Pencil topNav
class TopNavBar extends StatelessWidget implements PreferredSizeWidget {
  const TopNavBar({
    super.key,
    required this.title,
    this.credits,
    this.showBackButton = false,
    this.onBack,
    this.onCreditsTap,
  });

  final String title;
  final String? credits;
  final bool showBackButton;
  final VoidCallback? onBack;
  final VoidCallback? onCreditsTap;

  @override
  Size get preferredSize => const Size.fromHeight(56);

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 56,
      padding: const EdgeInsets.symmetric(horizontal: AppSpacing.screenPadding),
      decoration: const BoxDecoration(
        color: AppColors.surface,
        boxShadow: [
          BoxShadow(
            color: AppColors.shadowLight,
            blurRadius: 8,
            offset: Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        children: [
          if (showBackButton)
            GestureDetector(
              onTap: onBack ?? () => Navigator.of(context).pop(),
              behavior: HitTestBehavior.opaque,
              child: const SizedBox(
                width: 40,
                height: 40,
                child: Center(
                  child: Icon(
                    LucideIcons.arrow_left,
                    size: 24,
                    color: AppColors.textPrimary,
                  ),
                ),
              ),
            ),
          Expanded(
            child: showBackButton
                ? Center(
                    child: Text(
                      title,
                      style: AppTypography.navTitle,
                    ),
                  )
                : Align(
                    alignment: Alignment.centerLeft,
                    child: Text(
                      title,
                      style: AppTypography.navTitle,
                    ),
                  ),
          ),
          if (credits != null)
            CreditsBadge(credits: credits!, onTap: onCreditsTap)
          else
            const SizedBox(width: 40),
        ],
      ),
    );
  }
}