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

import '../../../../api/marianumcloud/webdav/queries/list_files/cacheable_file.dart';
import '../../../../model/account_data.dart';
import '../../../../model/endpoint_data.dart';
import '../data/file_type_icon.dart';

/// Leading slot for a file row: shows the Nextcloud thumbnail when the
/// server can render one (`nc:has-preview`), otherwise a typed file icon.
/// Always reserves the same square so rows stay aligned regardless of
/// whether a preview is present.
class FileLeading extends StatelessWidget {
  final CacheableFile file;

  /// Edge length of the rendered square. Defaults to the regular row size;
  /// use a larger value (e.g. in detail sheets) where appropriate.
  final double size;

  const FileLeading({required this.file, this.size = 28, super.key});

  @override
  Widget build(BuildContext context) {
    final icon = Icon(iconForFile(file), size: size);
    final fileId = file.fileId;
    return SizedBox(
      width: size,
      height: size,
      child: (file.isDirectory || file.hasPreview != true || fileId == null)
          ? Center(child: icon)
          : ClipRRect(
              borderRadius: BorderRadius.circular(4),
              child: CachedNetworkImage(
                imageUrl:
                    'https://${EndpointData().nextcloud().full()}'
                    '/index.php/core/preview'
                    '?fileId=$fileId&x=128&y=128&a=0',
                httpHeaders: AccountData().authHeaders(),
                fit: BoxFit.cover,
                fadeInDuration: Duration.zero,
                fadeOutDuration: Duration.zero,
                errorListener: (_) {},
                // Icon doubles as the loading placeholder so the list doesn't
                // pop a spinner per row while thumbnails stream in.
                placeholder: (_, _) => Center(child: icon),
                errorWidget: (_, _, _) => Center(child: icon),
              ),
            ),
    );
  }
}