import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:flash_chat/constants.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class ChatScreen extends StatefulWidget {
  static const String id = 'chat';
  @override
  _ChatScreenState createState() => _ChatScreenState();
}

class _ChatScreenState extends State<ChatScreen> {
  final _auht = FirebaseAuth.instance;
  User loggedInUser;
  String messageText;
  final _firestore = FirebaseFirestore.instance;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    getCurrentUser();
  }

  void getCurrentUser() async {
    try {
      final user = await _auht.currentUser;

      if (user != null) {
        loggedInUser = user;
        print(loggedInUser.email);
      }
    } catch (e) {
      print(e);
    }
  }

  // void getMessages() async {
  //   final messages = await _firestore.collection('messages').get();
  //   for (var message in messages.docs) {
  //     print(message.data());
  //   }
  // }
  void messagesStream() async {
    await for (var snapshot in _firestore.collection('messages').snapshots()) {
      for (var message in snapshot.docs) {
        print(message.data());
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: null,
        actions: <Widget>[
          IconButton(
              icon: Icon(Icons.close),
              onPressed: () {
                //Implement logout functionality
                // _auht.signOut();
                // Navigator.pop(context);
                messagesStream();
              }),
        ],
        title: Text('⚡️Chat'),
        backgroundColor: Colors.lightBlueAccent,
      ),
      body: SafeArea(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            StreamBuilder<QuerySnapshot>(
              stream: _firestore.collection('messages').snapshots(),
              builder: (context, snapshot) {
                List<Text> messageWidgets = [];
                if (snapshot.hasData) {
                  final messages = snapshot.data.docs;
                  for (var message in messages) {
                    try {
                      final messageText = (message['text']);
                      final messageSender = (message['sender']);
                      final messageWidget =
                          Text('$messageText from $messageSender');
                      messageWidgets.add(messageWidget);
                    } catch (E) {
                      print(E);
                    }
                  }
                }
                return Column(
                  children: messageWidgets,
                );
              },
            ),
            Container(
              decoration: kMessageContainerDecoration,
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Expanded(
                    child: TextField(
                      onChanged: (value) {
                        //Do something with the user input.
                        messageText = value;
                      },
                      decoration: kMessageTextFieldDecoration,
                    ),
                  ),
                  FlatButton(
                    onPressed: () {
                      //Implement send functionality.
                      _firestore.collection('messages').add(
                          {'sender': loggedInUser.email, 'text': messageText});
                    },
                    child: Text(
                      'Send',
                      style: kSendButtonTextStyle,
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}