Client/lib/screen/pages/files/files.dart

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

import '../../../api/marianumcloud/webdav/queries/listFiles/listFilesCache.dart';
import '../../../api/marianumcloud/webdav/queries/listFiles/listFilesResponse.dart';
import '../../../data/files/filesProps.dart';
import 'fileElement.dart';

class Files extends StatefulWidget {
  List<String> path;
  Files(this.path, {Key? key}) : super(key: key);

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

class BetterSortOption {
  String displayName;
  int Function(CacheableFile, CacheableFile) compare;
  IconData icon;

  BetterSortOption({required this.displayName, required this.icon, required this.compare});
}

enum SortOption {
  name,
  date,
  size
}

class SortOptions {
  static Map<SortOption, BetterSortOption> options = {
    SortOption.name: BetterSortOption(
      displayName: "Name",
      icon: Icons.sort_by_alpha,
      compare: (CacheableFile a, CacheableFile b) => a.name.compareTo(b.name)
    ),
    SortOption.date: BetterSortOption(
      displayName: "Datum",
      icon: Icons.more_time_outlined,
      compare: (CacheableFile a, CacheableFile b) => a.modifiedAt!.compareTo(b.modifiedAt!)
    ),
    SortOption.size: BetterSortOption(
      displayName: "Größe",
      icon: Icons.monitor_weight,
      compare: (CacheableFile a, CacheableFile b) {
        if(a.isDirectory || b.isDirectory) return a.isDirectory ? 1 : 0;
        if(a.size == null) return 0;
        if(b.size == null) return 1;
        return a.size!.compareTo(b.size!);
      }
    )
  };

  static BetterSortOption getOption(SortOption option) {
    return options[option]!;
  }
}

class _FilesState extends State<Files> {
  FilesProps props = FilesProps();
  ListFilesResponse? data;

  SortOption currentSort = SortOption.name;
  bool currentSortDirection = true;

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

    ListFilesCache(
        path: widget.path.isEmpty ? "/" : widget.path.join("/"),
        onUpdate: (ListFilesResponse d) => {
          setState(() {
            data = d;
          }),
        }
    );
  }

  @override
  Widget build(BuildContext context) {
    List<CacheableFile> files = (data?.files.toList() ?? List.empty())..sort(SortOptions.getOption(currentSort).compare);
    if(currentSortDirection) files = files.reversed.toList();

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.path.isNotEmpty ? widget.path.last : "Dateien"),
        actions: [
          IconButton(
            icon: const Icon(Icons.search),
            onPressed: () => {},
          ),
          PopupMenuButton<bool>(
            icon: Icon(currentSortDirection ? Icons.text_rotate_up : Icons.text_rotation_down),
            itemBuilder: (context) {
              return [true, false].map((e) => PopupMenuItem<bool>(
                  value: e,
                  enabled: e != currentSortDirection,
                  child: Row(
                    children: [
                      Icon(e ? Icons.text_rotate_up : Icons.text_rotation_down, color: Colors.black),
                      const SizedBox(width: 15),
                      Text(e ? "Aufsteigend" : "Absteigend")
                    ],
                  )
              )).toList();
            },
            onSelected: (e) {
              setState(() {
                currentSortDirection = e;
              });
            },
          ),
          PopupMenuButton<SortOption>(
            icon: const Icon(Icons.sort),
            itemBuilder: (context) {
              return SortOptions.options.keys.map((key) => PopupMenuItem<SortOption>(
                  value: key,
                  enabled: key != currentSort,
                  child: Row(
                    children: [
                      Icon(SortOptions.getOption(key).icon, color: Colors.black),
                      const SizedBox(width: 15),
                      Text(SortOptions.getOption(key).displayName)
                    ],
                  )
              )).toList();
            },
            onSelected: (e) {
              setState(() {
                currentSort = e;
              });
            },
          ),
        ],
      ),
      body: data == null ? const Center(child: CircularProgressIndicator()) : data!.files.isEmpty ? const ErrorView(icon: Icons.folder_off_rounded, text: "Der Ordner ist leer") : ListView.builder(
        itemCount: files.length,
        itemBuilder: (context, index) {
          CacheableFile file = files.toList().skip(index).first;
          return FileElement(file, widget.path);
        },
      ),
    );
  }
}