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import React, {
ReactElement,
useContext,
useEffect,
useRef,
useState,
} from "react";
import { MessageDisplay } from "../MessageDisplay/MessageDisplay";
import { Client } from "@stomp/stompjs";
import { Message, MessageType } from "../type/messageTypes";
import "./Chat.css";
import strings from "../Intl/strings.json";
import { LangContext } from "../context";
import { connectionAddress, endpoints } from "../consts";
const Chat = ({ user }: { user: string }): React.ReactElement => {
const lang = useContext(LangContext);
const chatPage = strings[lang].chat;
const [messages, setMessages] = useState<ReactElement[]>([]);
let stompClientRef = useRef(
new Client({
brokerURL: connectionAddress,
})
);
// TODO solve issue with non-static markup
stompClientRef.current.onConnect = (frame) => {
stompClientRef.current.subscribe(
endpoints.subscription,
(message) => {
console.log(
`Collected new message: ${message.body}`
);
const messageBody = JSON.parse(
message.body
) as Message;
console.log(messageBody);
setMessages((message) => {
return message.concat([
<MessageDisplay
key={`${messageBody.type}@${messageBody.timeMillis}`}
{...messageBody}
/>,
]);
});
}
);
stompClientRef.current.publish({
body: JSON.stringify({
type: MessageType.HELLO,
fromUserId: user,
toUserId: "everyone",
content: `${user} has joined the server!`,
timeMillis: Date.now(),
}),
destination: endpoints.destination,
});
};
// Generic error handlers
stompClientRef.current.onWebSocketError = (error) => {
console.error("Error with websocket", error);
};
stompClientRef.current.onStompError = (frame) => {
console.error(
"Broker reported error: " + frame.headers["message"]
);
console.error("Additional details: " + frame.body);
};
// Button press event handler.
const sendData = () => {
const entryElement: HTMLInputElement = document.getElementById(
"data-entry"
) as HTMLInputElement;
if (entryElement.value === "") {
return;
}
const messageData: Message = {
type: MessageType.MESSAGE,
fromUserId: user,
toUserId: "everyone",
content: entryElement.value,
timeMillis: Date.now(),
};
console.log(
`STOMP connection status: ${stompClientRef.current.connected}`
);
stompClientRef.current.publish({
body: JSON.stringify(messageData),
destination: endpoints.destination,
headers: {
"Content-Type":
"application/json; charset=utf-8",
},
});
entryElement.value = "";
};
useEffect(() => {
// Stomp client is disconnected after each re-render
// This should be actively avoided
stompClientRef.current.activate();
return () => {
stompClientRef.current.deactivate();
};
}, []);
// https://www.w3schools.com/jsref/obj_keyboardevent.asp
document.addEventListener("keydown", (ev: KeyboardEvent) => {
if (ev.key === "Enter") {
sendData();
}
});
useEffect(() => {
try {
const elem = document.querySelector(
".chat-inner-wrapper"
);
if (elem) {
elem.scrollTop = elem.scrollHeight;
} else {
}
} catch (err) {
console.log("error encountered");
}
return () => {};
}, [messages]);
return (
<fieldset className="chat">
<legend>
{chatPage.window.title.replaceAll(
"$userName",
user
)}
</legend>
<div className="chat-inner-wrapper">{messages}</div>
<span className="entry-box">
<input id="data-entry"></input>
<button onClick={() => sendData()}>
{chatPage.sendButtonPrompt}
</button>
</span>
</fieldset>
);
};
export default Chat;
|
