Envelope/mobile/lib/views/main/conversation/detail.dart

import 'dart:io';

import 'package:Envelope/database/repositories/messages_repository.dart';
import 'package:Envelope/services/messages_service.dart';
import 'package:Envelope/views/main/conversation/message.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

import '/components/custom_title_bar.dart';
import '/components/file_picker.dart';
import '/database/models/conversations.dart';
import '/database/models/messages.dart';
import '/database/models/my_profile.dart';
import '/views/main/conversation/settings.dart';

class ConversationDetail extends StatefulWidget{
  final Conversation conversation;
  const ConversationDetail({
    Key? key,
    required this.conversation,
  }) : super(key: key);

  @override
  _ConversationDetailState createState() => _ConversationDetailState();
}

class _ConversationDetailState extends State<ConversationDetail> {
  late ScrollController _scrollController;

  List<Message> messages = [];

  MyProfile profile = MyProfile(
    id: '',
    username: '',
    messageExpiryDefault: 'no_expiry',
  );

  TextEditingController msgController = TextEditingController();

  bool showFilePicker = false;
  List<File> selectedImages = [];

  bool sendDisabled = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: CustomTitleBar(
        title: Text(
          widget.conversation.name,
          style: TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
            color: Theme.of(context).appBarTheme.toolbarTextStyle?.color
          ),
        ),
        showBack: true,
        rightHandButton: IconButton(
          onPressed: (){
            Navigator.of(context).push(
              MaterialPageRoute(builder: (context) => ConversationSettings(
                  conversation: widget.conversation
              )),
            );
          },
          icon: Icon(
            Icons.settings,
            color: Theme.of(context).appBarTheme.iconTheme?.color,
          ),
        ),
      ),

      body: Stack(
        children: <Widget>[
          messagesView(),
          newMessageContent(),
        ],
      ),
    );
  }

  Future<void> fetchMessages() async {
    profile = await MyProfile.getProfile();
    messages = await MessagesRepository.getMessagesForThread(widget.conversation);
    setState(() {});
  }

  @override
  void initState() {
    sendDisabled = widget.conversation.adminSendMessages && !widget.conversation.admin;
    _scrollController = ScrollController();
    _scrollController.addListener(_scrollListener);
    super.initState();
    fetchMessages();
  }

  Future<void> _scrollListener() async {
    if (!(_scrollController.offset >= _scrollController.position.maxScrollExtent)) {
      return;
    }
    int page = 0;

    if (messages.length > 19) {
      page = messages.length ~/ 20;
    }

    await MessagesService.updateMessageThread(widget.conversation, page: page);
    await fetchMessages();
  }

  Widget messagesView() {
    if (messages.isEmpty) {
      return const Center(
        child: Text('No Messages'),
      );
    }

    return ListView.builder(
      controller: _scrollController,
      itemCount: messages.length,
      shrinkWrap: true,
      padding: EdgeInsets.only(
        top: 10,
        bottom: selectedImages.isEmpty ? 90 : 160,
      ),
      reverse: true,
      itemBuilder: (context, index) {
        return ConversationMessage(
          message: messages[index],
          profile: profile,
          index: index,
        );
      },
    );
  }

  Widget showSelectedImages() {
    if (selectedImages.isEmpty) {
      return const SizedBox.shrink();
    }

    return SizedBox(
      height: 80,
      width: double.infinity,
        child: ListView.builder(
        itemCount: selectedImages.length,
        shrinkWrap: true,
        scrollDirection: Axis.horizontal,
        padding: const EdgeInsets.all(5),
        itemBuilder: (context, i) {

          return Stack(
            children: [
              Column(
                children: [
                  const SizedBox(height: 5),
                  Container(
                    alignment: Alignment.center,
                    height: 65,
                    width: 65,
                    child: Image.file(
                      selectedImages[i],
                      fit: BoxFit.fill,
                    ),
                  ),
                ],
              ),

              SizedBox(
                height: 60,
                width: 70,
                child: Align(
                  alignment: Alignment.topRight,
                  child: GestureDetector(
                    onTap: () {
                      setState(() {
                        selectedImages.removeAt(i);
                      });
                    },
                    child: Container(
                      height: 20,
                      width: 20,
                      decoration: BoxDecoration(
                        color: Theme.of(context).colorScheme.onPrimary,
                        borderRadius: BorderRadius.circular(30),
                      ),
                      child: Icon(
                        Icons.cancel,
                        color: Theme.of(context).primaryColor,
                        size: 20
                      ),
                    ),
                  ),
                ),
              ),

            ],
          );
        },
      )
    );
  }

  Widget newMessageContent() {
    return Align(
    alignment: Alignment.bottomLeft,
    child: ConstrainedBox(
      constraints: BoxConstraints(
        maxHeight: selectedImages.isEmpty ?
          200.0 :
          270.0,
      ),
      child: Container(
        padding: const EdgeInsets.only(left: 10,bottom: 10,top: 10),
        width: double.infinity,
        color: Theme.of(context).backgroundColor,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [

            showSelectedImages(),

            Row(
              children: <Widget>[

                GestureDetector(
                  onTap: (){
                    setState(() {
                      if (sendDisabled) {
                        return;
                      }

                      showFilePicker = !showFilePicker;
                    });
                  },
                  child: Container(
                    height: 30,
                    width: 30,
                    decoration: BoxDecoration(
                      color: Theme.of(context).primaryColor,
                      borderRadius: BorderRadius.circular(30),
                    ),
                    child: Icon(
                      Icons.add,
                      color: Theme.of(context).colorScheme.onPrimary,
                      size: 20
                    ),
                  ),
                ),

                const SizedBox(width: 15,),

                Expanded(
                  child: TextField(
                    enabled: !sendDisabled,
                    decoration: InputDecoration(
                      hintText: sendDisabled ?
                        'Messages disabled for non-admins' :
                        'Write message...',
                      hintStyle: TextStyle(
                        color: Theme.of(context).hintColor,
                      ),
                      border: InputBorder.none,
                    ),
                    maxLines: null,
                    controller: msgController,
                  ),
                ),

                const SizedBox(width: 15),

                SizedBox(
                  width: 45,
                  height: 45,
                    child: FittedBox(
                      child: FloatingActionButton(
                        onPressed: () async {
                          if ((msgController.text == '' && selectedImages.isEmpty) || sendDisabled) {
                            return;
                          }
                          await MessagesService.sendMessage(
                            widget.conversation,
                            data: msgController.text != '' ? msgController.text : null,
                            files: selectedImages,
                          );
                          messages = await MessagesRepository.getMessagesForThread(widget.conversation);
                          setState(() {
                            msgController.text = '';
                            selectedImages = [];
                          });
                        },
                        backgroundColor: Theme.of(context).primaryColor,
                        child: Icon(
                          Icons.send,
                          color: Theme.of(context).colorScheme.onPrimary,
                          size: 22
                        ),
                      ),
                    ),
                  ),
                  const SizedBox(width: 10),
                ],
              ),

              AnimatedSwitcher(
                duration: const Duration(milliseconds: 250),
                transitionBuilder: (Widget child, Animation<double> animation) {
                  return SizeTransition(sizeFactor: animation, child: child);
                },
                child: showFilePicker ?
                  FilePicker(
                    key: const Key('filePicker'),
                    cameraHandle: (XFile image) {},
                    galleryHandleMultiple: (List<XFile> images) async {
                      for (var img in images) {
                        selectedImages.add(File(img.path));
                      }
                      setState(() {
                        showFilePicker = false;
                      });
                    },
                    fileHandle: () {},
                  ) :
                  const SizedBox(height: 15),
              ),
            ],
          ),
        ),
      ),
    );
  }
}