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import { useEffect, useState, useCallback } from 'react';
import { useParams } from 'react-router-dom';
import moment from 'moment';
import PM from './PM';
import MessageInput from './MessageInput';
import UserInfo from './UserInfo';
import { getChat, pm } from '../api';
import './Chat.css';
import { useVisitor } from './VisitorContext';
import { Helmet } from 'react-helmet';
/**
* @typedef {Object} ChatProps
* @property {EventSource} connection
*/
/**
* Chat component
* @param {ChatProps} props
*/
export default function Chat(props) {
const [visitor] = useVisitor();
const [chats, setChats] = useState([]);
const params = useParams();
let loadChat = useCallback((uname) => {
const { hash } = visitor;
setChats([]);
if (hash && uname) {
getChat(uname)
.then(response => {
setChats(response.data);
});
}
}, []);
let onMessage = useCallback((json) => {
const msg = JSON.parse(json.data);
if (msg.user.uname === params.user) {
setChats((oldChat) => {
return [msg, ...oldChat];
});
}
}, [params.user]);
let onSend = (template) => {
pm(template.to.uname, template.body)
.then(res => {
loadChat(params.user);
}).catch(console.log);
};
useEffect(() => {
if (props.connection.addEventListener) {
props.connection.addEventListener('msg', onMessage);
}
loadChat(params.user);
console.log(props.connection);
return () => {
if (props.connection.removeEventListener) {
props.connection.removeEventListener('msg', onMessage);
}
};
}, [props.connection, onMessage, loadChat, params.user]);
const uname = params.user;
return (
<div className="msg-cont">
<Helmet>
<title>PM: {uname}</title>
</Helmet>
<UserInfo uname={uname} />
{uname ? (
<div className="chatroom">
<ul className="Chat_messages">
{
chats.map((chat) =>
<PM key={moment.utc(chat.timestamp).valueOf()} chat={chat} {...props} />
)
}
</ul>
<MessageInput data={{ mid: 0, timestamp: '0', to: { uname: uname } }} onSend={onSend}>
Reply...
</MessageInput>
</div>
) : (
<div className="chatroom no-selection"><p>No chat selected</p></div>
)
}
</div>
);
}
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