// Version: 1.0.0 | Created: 2026-04-01
// Individual room list tile. Kept under 100 lines.

import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:timeago/timeago.dart' as timeago;

import '../domain/room_model.dart';

class RoomTile extends StatelessWidget {
  const RoomTile({super.key, required this.room, required this.onTap});

  final RoomModel room;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final hasUnread = room.unreadCount > 0;

    return ListTile(
      leading: _RoomAvatar(room: room),
      title: Text(
        room.displayName,
        style: theme.textTheme.bodyLarge?.copyWith(
          fontWeight: hasUnread ? FontWeight.w600 : FontWeight.normal,
        ),
        maxLines: 1,
        overflow: TextOverflow.ellipsis,
      ),
      subtitle: room.lastMessagePreview != null
          ? Text(
              room.lastMessagePreview!,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: theme.textTheme.bodySmall?.copyWith(
                color: theme.colorScheme.onSurface.withAlpha(153),
              ),
            )
          : null,
      trailing: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.end,
        children: [
          if (room.lastActivityAt != null)
            Text(
              timeago.format(room.lastActivityAt!, locale: 'en_short'),
              style: theme.textTheme.labelSmall?.copyWith(
                color: hasUnread
                    ? theme.colorScheme.primary
                    : theme.colorScheme.onSurface.withAlpha(102),
              ),
            ),
          if (hasUnread) ...[
            const SizedBox(height: 4),
            _UnreadBadge(count: room.unreadCount),
          ],
        ],
      ),
      onTap: onTap,
    );
  }
}

class _RoomAvatar extends StatelessWidget {
  const _RoomAvatar({required this.room});

  final RoomModel room;

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final initials = room.displayName.isNotEmpty
        ? room.displayName[0].toUpperCase()
        : '?';

    if (room.avatarUrl != null) {
      return CircleAvatar(
        radius: 24,
        backgroundImage: CachedNetworkImageProvider(room.avatarUrl!),
        backgroundColor: theme.colorScheme.surfaceContainerHighest,
      );
    }

    return CircleAvatar(
      radius: 24,
      backgroundColor: theme.colorScheme.primary.withAlpha(51),
      child: Text(
        initials,
        style: TextStyle(
          color: theme.colorScheme.primary,
          fontWeight: FontWeight.bold,
        ),
      ),
    );
  }
}

class _UnreadBadge extends StatelessWidget {
  const _UnreadBadge({required this.count});

  final int count;

  @override
  Widget build(BuildContext context) {
    final label = count > 99 ? '99+' : count.toString();
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      decoration: BoxDecoration(
        color: Theme.of(context).colorScheme.primary,
        borderRadius: BorderRadius.circular(10),
      ),
      child: Text(
        label,
        style: const TextStyle(
          color: Colors.white,
          fontSize: 11,
          fontWeight: FontWeight.bold,
        ),
      ),
    );
  }
}