import 'package:flutter/material.dart';
import 'package:marianum_mobile/api/marianumcloud/webdav/queries/listFiles/cacheableFile.dart';
import 'package:marianum_mobile/widget/errorView.dart';
import 'package:provider/provider.dart';

import '../../../data/files/filesProps.dart';
import 'fileElement.dart';

class Files extends StatefulWidget {
  Function appBar;
  Files(this.appBar, {Key? key}) : super(key: key);

  @override
  State<Files> createState() => _FilesState();
}

class _FilesState extends State<Files> {

  @override
  void initState() {
    super.initState();

    WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
      Provider.of<FilesProps>(context, listen: false).run();
    });
  }

  void updateAppBar(FilesProps props) {
    WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
      widget.appBar(context, AppBar(
        leading: BackButton(
          onPressed: () {
            updateAppBar(props);
            props.popFolder();
          },
        ),
        title: Text(props.currentFolderName),
      ));
    });
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<FilesProps>(
      builder: (context, value, child) {
        if(value.primaryLoading()) return const Center(child: CircularProgressIndicator());

        if(value.listFilesResponse.files.isEmpty) {
          return const ErrorView(text: "Der Ordner ist leer", icon: Icons.folder_off_outlined);
        }

        List<CacheableFile> files = value.listFilesResponse.files.toList();
        files.sort((a, b) => a.isDirectory ? -1 : 1);

        return ListView.builder(
          itemCount: files.length,
          itemBuilder: (context, index) {
            CacheableFile file = files.skip(index).first;
            return FileElement(file, updateAppBar);
          },
        );
      }
    );
  }
}