import 'package:flutter/material.dart';
import 'package:gophershy/gopherlib.dart';
import 'package:gophershy/gopher_widgets.dart';

class _GopherBrowserState extends State<GopherBrowser> {
  // TODO: when is this updated? how is the widget.initialUrl at play?
  // TODO: We must have button: Menu! to attempt to render any text file as menu
  //       Because when we visit from direct url we don't know what file type we get
  //       Other detection methods could be applied later
  //       This may not be the most common use case so maybe hide it in some hayburger menu
  String currentUrl = "gopher://treebrary.org";
  // Directory listing doesn't have to end with / so we can never
  // be sure whether we're visiting menu or not.
  // When true, we try to parse anything as menu
  bool forceMenu = false;

  /// Only links to session history, will be much bigger than [_loadedStack]
  // Probably remove from here
  final List<ParsedGopherItem> _urlStack = List<ParsedGopherItem>.empty(growable: true);

  @override
  void initState() {
    super.initState();
    print("Started with: ${widget.initialUrl}");
    _currentItem = ParsedGopherItem.parseUrl(widget.initialUrl);
  }

  late ParsedGopherItem _currentItem;
  void gotoUrl(String link) {
    print("GoTo: $link from: $currentUrl");
    if (link == currentUrl) return;
    setState(() {
      print("prev:  Submitted: $link");
      _currentItem = ParsedGopherItem.parseUrl(link);
      _urlStack.add(_currentItem);
      currentUrl = link;
    });
  }

  @override
  Widget build(BuildContext context) {
    print("GopherBrowseState: $currentUrl");
    return Builder(builder: (context) {
      return Column(
        children: [
          TextField(
            onSubmitted: gotoUrl,
          ),
          Expanded(
            child: GopherLoader(
              key: ValueKey(currentUrl),
              forceMenu: forceMenu,
              parsedGopherItem: _currentItem,
          )),
        ],
      );
    });
  }
}

class GopherBrowser extends StatefulWidget {
  final String initialUrl;
  const GopherBrowser({super.key, required this.initialUrl});

  @override
  State<GopherBrowser> createState() => _GopherBrowserState();
}

class _GopherLoaderState extends State<GopherLoader> {
  Future<LoadedGopherItem>? _data;

  final List<LoadedGopherItem> _loadedHistory =
      List<LoadedGopherItem>.empty(growable: true);

  @override
  void initState() {
    super.initState();
    _data = widget.parsedGopherItem.load(forceMenu: widget.forceMenu).then(
      (value) {
        print("Pushed beacuse of initState");
        return _onLoadFinished(value);
      },
    );
    print("Reinitred GopherLoaderState");
  }

  LoadedGopherItem _onLoadFinished(LoadedGopherItem data) {
    _loadedHistory.add(data);
    print("Added to histor: ${_loadedHistory.length}");
    return data;
  }

  void _goToNext(ParsedGopherItem item, {String? why}) {
    print("Going to next: $why");
    setState(() {
      print("requesting view of: ${item.url} ${item.documentType}");
      _data = item.load(forceMenu: false).then(
        (value) {
          print("Pushed beacuse of gotoNext");
          return _onLoadFinished(value);
        },
      );
    });
  }

  void _onBackButton(bool popable, object) {
    print("Gonna pop i guess");
    // TODO: toast if at the end of history, make time stamp and quit if pressed back button quickly again
    // TODO: Setting on whether back button goes up a directory or back in navigation stack -> may be the same but might not be
    if (_loadedHistory.length > 1) {
      _loadedHistory.removeLast();
      setState(() {
          _data = Future<LoadedGopherItem>.delayed(
            Duration.zero, () => _loadedHistory.last);
      });
    } else {
      // TODO: Toast here
      print("At the end of stack");
    }
  }

  @override
  Widget build(BuildContext context) {
    return PopScope(
      canPop: false,
      onPopInvokedWithResult: _onBackButton,
      child: FutureBuilder<LoadedGopherItem>(
          future: _data,
          builder: (cont, snap) {
            print("${snap.connectionState}");
            if (snap.connectionState != ConnectionState.done) {
              return const CircularProgressIndicator();
            } else {
              if (snap.hasData) {
                print(
                    "data & doctype: ${snap.data!}, ${snap.data!.parsed.documentType}");
                return switch (snap.data!.parsed.documentType) {
                  DocumentType.TextFile => GopherText(snap.data!),
                  DocumentType.Directory => GopherDirectory(
                      parsedDirectory: snap.data!,
                      onItemClick: _goToNext,
                    ),
                  _ => Container(color: Colors.yellow),
                };
              } else {
                return Text("Errored ${snap.error}");
              }
            }
          }),
    );
  }
}

class GopherLoader extends StatefulWidget {
  final ParsedGopherItem parsedGopherItem;
  final bool? forceMenu;
  const GopherLoader(
      {super.key, required this.parsedGopherItem, this.forceMenu});

  @override
  State<GopherLoader> createState() => _GopherLoaderState();
}

class MenuItem extends StatelessWidget {
  static const Map<DocumentType, IconData> _iconMap = {
    DocumentType.TextFile: Icons.short_text,
    DocumentType.Directory: Icons.folder,
    DocumentType.CSO: Icons.contact_page,
    DocumentType.ErrorCode: Icons.error,
    DocumentType.BinHex: Icons.precision_manufacturing_sharp,
    DocumentType.DosBinary: Icons.precision_manufacturing_rounded,
    DocumentType.Uuencoded: Icons.precision_manufacturing_outlined,
    DocumentType.Search: Icons.search_rounded,
    DocumentType.Telnet: Icons.smart_screen_sharp,
    DocumentType.Telnet3270: Icons.smart_screen_sharp,
    DocumentType.Binary: Icons.file_download,
    DocumentType.MirrorOrAlternate: Icons.content_copy,
    DocumentType.Gif: Icons.animation,
    DocumentType.Image: Icons.image,
    DocumentType.Bitmap: Icons.picture_as_pdf,
    DocumentType.Movie: Icons.local_movies,
    DocumentType.Soundfile: Icons.music_note,
    DocumentType.Doc: Icons.document_scanner,
    DocumentType.Html: Icons.html,
    DocumentType.Informational: Icons.info,
    DocumentType.PngImage: Icons.hide_image_sharp,
    DocumentType.RichTextDocument: Icons.format_color_text,
    DocumentType.SoundFile: Icons.library_music,
    DocumentType.Pdf: Icons.picture_as_pdf,
    DocumentType.Xml: Icons.html_rounded,
    DocumentType.Unknown: Icons.question_mark,
  };

  IconData _getIcon(DocumentType forWhat) {
    return _iconMap[forWhat] ?? Icons.question_mark_sharp;
  }

  final ParsedGopherItem item;
  const MenuItem(this.item, {super.key});

  void _itemTap(BuildContext cont) {
    Navigator.push(cont, MaterialPageRoute(builder: (cont) {
      if (item.documentType == DocumentType.Directory) {
        return const Text("it was a directory");
      } else {
        return Container();
      }
    }));
  }

  @override
  Widget build(BuildContext context) {
    // TODO: Something something virtual item here as well
    if (item.documentType == DocumentType.Unknown) {
      return Text(item.name ?? "?");
    }
    // Put it into GestureDetector and on click open new route loading given item
    return GestureDetector(
      onTap: () => _itemTap(context),
      child: Row(
        children: [
          Icon(_getIcon(item.documentType)),
          Column(
            children: [
              Text(item.name ?? ""),
            ],
          ),
        ],
      ),
    );
  }
}