import 'package:flutter/material.dart';

class DesktopTopBar extends StatelessWidget {
  final String username;
  final String? profileImage;
  final VoidCallback? onSearchTap;
  final VoidCallback? onNotificationTap;
  final VoidCallback? onAvatarTap;

  const DesktopTopBar({
    Key? key,
    required this.username,
    this.profileImage,
    this.onSearchTap,
    this.onNotificationTap,
    this.onAvatarTap,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Container(
      height: 64,
      padding: const EdgeInsets.symmetric(horizontal: 24),
      decoration: BoxDecoration(
        color: theme.scaffoldBackgroundColor,
        border: Border(
          bottom: BorderSide(
            color: theme.dividerColor.withValues(alpha: 0.3),
          ),
        ),
      ),
      child: Row(
        children: [
          // Left: search bar
          Expanded(
            child: ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: 400),
              child: SizedBox(
                height: 44,
                child: TextField(
                  onTap: onSearchTap,
                  readOnly: onSearchTap != null,
                  decoration: InputDecoration(
                    filled: true,
                    fillColor: theme.colorScheme.surfaceContainerHighest
                        .withValues(alpha: 0.4),
                    prefixIcon: Icon(Icons.search, color: theme.hintColor),
                    hintText: 'Search',
                    hintStyle: theme.textTheme.bodyMedium
                        ?.copyWith(color: theme.hintColor),
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(12),
                      borderSide: BorderSide.none,
                    ),
                    contentPadding: const EdgeInsets.symmetric(vertical: 0),
                  ),
                  style: theme.textTheme.bodyLarge,
                ),
              ),
            ),
          ),

          const SizedBox(width: 16),

          // Right: notification bell + avatar
          Stack(
            children: [
              IconButton(
                onPressed: onNotificationTap,
                icon: Icon(
                  Icons.notifications_none,
                  color: theme.iconTheme.color,
                ),
              ),
              Positioned(
                right: 6,
                top: 6,
                child: CircleAvatar(
                  radius: 8,
                  backgroundColor: Colors.red,
                  child: Text(
                    '2',
                    style: theme.textTheme.bodySmall?.copyWith(
                      color: Colors.white,
                      fontSize: 10,
                    ),
                  ),
                ),
              ),
            ],
          ),
          const SizedBox(width: 8),
          GestureDetector(
            onTap: onAvatarTap,
            child: _buildAvatar(),
          ),
        ],
      ),
    );
  }

  Widget _buildAvatar() {
    if (profileImage != null && profileImage!.trim().isNotEmpty) {
      final url = profileImage!.trim();
      if (url.startsWith('http')) {
        return CircleAvatar(
          radius: 20,
          backgroundColor: Colors.grey.shade200,
          backgroundImage: NetworkImage(url),
          onBackgroundImageError: (_, __) {},
        );
      }
    }

    final name = username.trim();
    String initials = 'U';
    if (name.isNotEmpty) {
      if (name.contains('@')) {
        initials = name[0].toUpperCase();
      } else {
        final parts = name.split(' ').where((p) => p.isNotEmpty).toList();
        initials = parts.isEmpty
            ? 'U'
            : parts.take(2).map((p) => p[0].toUpperCase()).join();
      }
    }

    return CircleAvatar(
      radius: 20,
      backgroundColor: Colors.blue.shade600,
      child: Text(
        initials,
        style: const TextStyle(
          color: Colors.white,
          fontWeight: FontWeight.bold,
        ),
      ),
    );
  }
}