import 'dart:js_interop';
import 'package:web/web.dart' as web;
import 'package:flutter/material.dart';
import 'dart:ui_web' as ui;
import 'api_service.dart';
import 'structs.dart';

class CollapsableEmails extends StatefulWidget {
  final List<String> thread; // email id's in the form xyz@gmail.com
  final List<String> threadHTML;
  final String threadIDs;

  CollapsableEmails(
      {required this.thread,
      required this.threadHTML,
      required this.threadIDs});

  @override
  State<CollapsableEmails> createState() => _CollapsableEmailsState();
}

class _CollapsableEmailsState extends State<CollapsableEmails> {
  List<String> emailsHTML = []; //html of the emails in the thread
  // build attachments with the forldar name and id
  Set<int> _expandedEmails = {}; //open emails
  List viewtypeIDs = []; //IDs of the viewtypes, order matters
  List heightOfViewTypes = []; //the height of each viewtype
  List<SerializableMessage> emailsInThread = [];
  bool _isLoaded = false;
  static bool _isListenerRegistered = false;

  @override
  void initState() {
    super.initState();
    _registerViewFactory(widget.threadHTML);
    _serializableData(widget.threadIDs); // this
    _keyListener();
  }

  void _registerViewFactory(List<String> currentContent) async {
    // setState(() { //update to do item per item
    // each item to have itsviewtype ID
    // is this necessarey here??

    //could just move to collapsable

    for (var emailHTML in widget.threadHTML) {
      String viewTypeId = 'email-${DateTime.now().millisecondsSinceEpoch}';

      final ghost = web.document.createElement('div') as web.HTMLDivElement
        ..style.visibility = 'hidden'
        ..style.position = 'absolute'
        ..style.width = '100%'
        ..style.overflow = 'auto'
        ..innerHTML = emailHTML
            .toJS; // temporarily index because it has to do all of them
      web.document.body?.append(ghost);
      await Future.delayed(Duration(milliseconds: 10));

      final heightOfEmail = ghost.scrollHeight;
      ghost.remove();

      final HTMLsnippet = web.document.createElement('div')
          as web.HTMLDivElement
        ..id = viewTypeId
        ..innerHTML = emailHTML
            .toJS; // temporarily index because it has to do all of them
      HTMLsnippet.style
        ..width = '100%'
        ..height = '${heightOfEmail}px'
        ..overflow = 'auto'
        ..scrollBehavior = 'smooth';

      ui.platformViewRegistry.registerViewFactory(
        viewTypeId,
        (int viewId) => HTMLsnippet,
      );
      viewtypeIDs.add(viewTypeId);
      heightOfViewTypes.add(heightOfEmail);
    }
  }

  void _serializableData(String threadID) async {
    emailsInThread = await ApiService().threadsInSerializable(threadID);
    print("done thread serializable");
    if (!mounted) return;
    setState(() {
      _isLoaded = true;
    });
  }

  void _keyListener() {
    if (_isListenerRegistered) return;
    _isListenerRegistered = true;
    web.window.document.addEventListener(
      'keydown',
      ((web.Event event) {
        final keyEvent = event as web.KeyboardEvent;

        if (keyEvent.key.toLowerCase() == 'k') {
          print('You pressed the "k" key!');
          final leftPurpleNums = web.document.getElementsByClassName("right");

          for (int i = 0; i < leftPurpleNums.length; i++) {
            final currentElement = leftPurpleNums.item(i) as web.HTMLElement;
            final opacity = web.window.getComputedStyle(currentElement).opacity;
            
            currentElement.style.opacity =
                (opacity == '0') ? '1.0' : '0.0'; // works mostly
          }
        }
      }).toJS,
    );
  }

  @override
  Widget build(BuildContext context) {
    return _isLoaded
        ? Column(children: [
            Expanded(
              child: ListView.builder(
                itemCount: widget.thread.length,
                itemBuilder: (context, index) {
                  final isExpanded = _expandedEmails
                      .contains(index); //check if email is expanded
                  return Column(
                    children: [
                      ListTile(
                        title: Text(emailsInThread[index].from),
                        trailing: Text(emailsInThread[index].date),
                        onTap: () {
                          setState(() {
                            if (isExpanded) {
                              _expandedEmails.remove(index);
                            } else {
                              _expandedEmails.add(index);
                            }
                          });
                        },
                      ),
                      if (isExpanded)
                        SizedBox(
                          height: heightOfViewTypes[index].toDouble(),
                          child: HtmlElementView(
                              key: UniqueKey(), viewType: viewtypeIDs[index]),
                        ),
                      Divider(),
                    ],
                  );
                },
              ),
            )
          ])
        : const Center(child: CircularProgressIndicator());
  }
}