Added basis for internationlisation

Currently supported: el_GR, en_US, ar_SA, zh_TW

8 files changed, 241 insertions, 111 deletions

diff --git a/src/App.tsx b/src/App.tsx
index 8c4c748..f6511b0 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,31 +1,56 @@
-import React, { useState } from "react";
+import React, { createContext, useContext, useState } from "react";
 import Chat from "./Chat/Chat";
 import "./App.css";
-import { Message } from "./Chat/types";
+import { LangType, Message } from "./Chat/types";
 import { MessageContainer } from "./Chat/MessageContainer";
-const App = (): React.ReactElement => {
+import strings from "./Intl/strings.json";
+import { LangContext } from "./context";
+
+// what we call "in the business" type gymnastics
+const Wrapper = (): React.ReactElement => {
+	const [lang, setLang] = useState<LangType>("en_US");
+
+	return (
+		<LangContext.Provider value={lang}>
+			<App
+				changeLang={(value: string) => {
+					setLang(value as LangType);
+				}}
+			/>
+		</LangContext.Provider>
+	);
+};
+const App = ({
+	changeLang,
+}: {
+	changeLang: (value: string) => void;
+}): React.ReactElement => {
 	const [username, setUsername] = useState<string>();
 	const [messages, setMessages] = useState<Message[]>([]);
+	// const [lang, setLang] = useState<LangType>("en_US");
+	const lang = useContext(LangContext);
+	const home = strings[lang].homepage;
 	if (!username) {
-		const newName = prompt("Username:") as string;
+		const newName = prompt(home.userNamePrompt) as string;
 		setUsername(newName);
 	}
 	return (
 		<div className="App">
-			<h1>Local Area Network Chat Application</h1>
-			<pre>
-				This web application was built for the purposes of an EPQ
-				project.
-			</pre>
+			<h1>{home.title}</h1>
+			<pre>{home.description}</pre>
+			<button
+				onClick={(ev) => {
+					const selection = prompt(home.newLangPrompt);
+					changeLang(selection ? (selection as LangType) : lang);
+				}}
+			>
+				{home.switchLang}
+			</button>
 			{messages.map((message) => {
 				return <MessageContainer {...message} />;
 			})}
-			{
-				<Chat
-					user={username as string}
-				/>
-			}
+			{<Chat user={username as string} />}
 		</div>
 	);
 };
-export default App;
+export default Wrapper;
diff --git a/src/Chat/Chat.tsx b/src/Chat/Chat.tsx
index e2edfcb..76d97fa 100644
--- a/src/Chat/Chat.tsx
+++ b/src/Chat/Chat.tsx
@@ -1,9 +1,17 @@
-import React, { ReactElement, useEffect, useRef, useState } from "react";
+import React, {
+	ReactElement,
+	useContext,
+	useEffect,
+	useRef,
+	useState,
+} from "react";
 import { MessageContainer } from "./MessageContainer";
 import { Client, Stomp, StompHeaders } from "@stomp/stompjs";
-import { Message, MessageType } from "./types";
+import { LangType, Message, MessageType } from "./types";
 import { renderToStaticMarkup } from "react-dom/server";
 import "./Chat.css";
+import strings from "../Intl/strings.json";
+import { LangContext } from "../context";
 // The last bit of magic sauce to make this work
 // EXPLANATION
 //
@@ -16,6 +24,8 @@ const endpoints = {
 	history: "/api/v1/msg/",
 };
 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({
@@ -61,7 +71,6 @@ const Chat = ({ user }: { user: string }): React.ReactElement => {
 
 	// Button press event handler.
 	const sendData = () => {
-
 		const entryElement: HTMLInputElement = document.getElementById(
 			"data-entry"
 		) as HTMLInputElement;
@@ -103,12 +112,12 @@ const Chat = ({ user }: { user: string }): React.ReactElement => {
 	});
 	return (
 		<div className="chat">
-            <div className="chat-inner-wrapper">
-                {messages}
-            </div>
+			<div className="chat-inner-wrapper">{messages}</div>
 			<span className="entry-box">
 				<input id="data-entry"></input>
-				<button onClick={() => sendData()}>Send</button>
+				<button onClick={() => sendData()}>
+					{chatPage.sendButtonPrompt}
+				</button>
 			</span>
 		</div>
 	);
diff --git a/src/Chat/MessageContainer.tsx b/src/Chat/MessageContainer.tsx
index dd75fc2..345da36 100644
--- a/src/Chat/MessageContainer.tsx
+++ b/src/Chat/MessageContainer.tsx
@@ -1,24 +1,55 @@
-import React from "react";
+import React, { useContext } from "react";
 import { Message, MessageType } from "./types";
+import { LangContext } from "../context";
+import strings from "../Intl/strings.json";
+export const MessageContainer = ({
+	type,
+	fromUserId,
+	toUserId,
+	content,
+	timeMillis,
+}: Message): React.ReactElement<Message> => {
+	const dateTime: Date = new Date(timeMillis);
+	const lang = useContext(LangContext);
+	const msgPage = strings[lang].chat;
+	/*  FIXED funny error
+	 *   DESCRIPTION
+	 *   The line below was
+	 *   return (<p>[{dateTime.toLocaleString(Intl.DateTimeFormat().resolvedOptions().timeZone)}]...</p>)
+	 *   The line incorrectly generated a value of "UTC" as the parameter to toLocaleString()
+	 *   While "UTC" is an accepted string value, in EEST, aka. "Europe/Athens" timezone string is not an acceptable parameter.
+	 *   This caused the return statement to fail, and the message fails to render, despite it being correctly committed to the db.
+	 *   Funny clown moment 🤡
+	 */
 
-export const MessageContainer = (
-    {
-        type,
-        fromUserId,
-        toUserId,
-        content,
-        timeMillis,
-    }: Message
-): React.ReactElement<Message> => {
-    const dateTime: Date = new Date(timeMillis);
-    /*  FIXED funny error
-    *   DESCRIPTION
-    *   The line below was
-    *   return (<p>[{dateTime.toLocaleString(Intl.DateTimeFormat().resolvedOptions().timeZone)}]...</p>)
-    *   The line incorrectly generated a value of "UTC" as the parameter to toLocaleString()
-    *   While "UTC" is an accepted string value, in EEST, aka. "Europe/Athens" timezone string is not an acceptable parameter.
-    *   This caused the return statement to fail, and the message fails to render, despite it being correctly committed to the db.
-    *   Funny clown moment 🤡
-    */  
-    return (<p>[{dateTime.toLocaleString()}] Message from {fromUserId}: {content}</p>);
+	switch (type) {
+		case MessageType.HELLO as MessageType:
+			return (
+				<p>
+					[{dateTime.toLocaleString()}]{" "}
+					{msgPage.joinMessage.replace("$userName", fromUserId)}
+				</p>
+			);
+		case MessageType.MESSAGE as MessageType:
+			return (
+				<p>
+					[{dateTime.toLocaleString()}]{" "}
+					{msgPage.serverMessage
+						.replace("$userName", fromUserId)
+						.replace("$content", content)}
+				</p>
+			);
+		case MessageType.DATA as MessageType:
+			return <></>;
+		case MessageType.SYSTEM as MessageType:
+			return <></>;
+		default:
+			console.error("Illegal MessageType reported!");
+			return (
+				<p>
+					[{dateTime.toLocaleString()}] **THIS MESSAGE CANNOT BE
+					CORRECTLY SHOWN BECAUSE THE CLIENT ENCOUNTERED AN ERROR**
+				</p>
+			);
+	}
 };
diff --git a/src/Chat/types.tsx b/src/Chat/types.tsx
index f7ff7be..cdbbd22 100644
--- a/src/Chat/types.tsx
+++ b/src/Chat/types.tsx
@@ -1,46 +1,46 @@
-export enum MessageType {
-    MESSAGE,
-    SYSTEM,
-    HELLO,
-    DATA,
+export const enum MessageType {
+	MESSAGE = "MESSAGE",
+	SYSTEM = "SYSTEM",
+	HELLO = "HELLO",
+	DATA = "DATA",
 }
 export enum SystemMessageCode {
-    REQ,
-    RES,
-    ERR,
+	REQ,
+	RES,
+	ERR,
 }
 export type HistoryFetchResult = {
-    count: number,
-    items: Array<ChatMessage>,
-}
+	count: number;
+	items: Array<ChatMessage>;
+};
 export type ErrorResult = {
-    text: string,
-}
+	text: string;
+};
 export type TimestampSendRequest = {
-    ts: number,
-}
+	ts: number;
+};
 export type SystemMessage = {
-    code: SystemMessageCode
-    data: HistoryFetchResult | ErrorResult | TimestampSendRequest
-}
+	code: SystemMessageCode;
+	data: HistoryFetchResult | ErrorResult | TimestampSendRequest;
+};
 export type ChatMessage = {
-    fromUserId: string,
-    toUserId: string,
-    content: string,
-    timeMillis: number
-}
+	fromUserId: string;
+	toUserId: string;
+	content: string;
+	timeMillis: number;
+};
 export type HelloMessage = {
-    fromUserId: string,
-    timeMillis: number,
-}
-export type DataMessage = {
-
-}
+	fromUserId: string;
+	timeMillis: number;
+};
+export type DataMessage = {};
 export type Message = {
-    type: MessageType,
-    // data: SystemMessage | ChatMessage | HelloMessage
-    fromUserId: string,
-    toUserId: string,
-    content: string,
-    timeMillis: number
-}
\ No newline at end of file
+	type: MessageType;
+	// data: SystemMessage | ChatMessage | HelloMessage
+	fromUserId: string;
+	toUserId: string;
+	content: string;
+	timeMillis: number;
+};
+export const acceptedLangs = ["en_US", "zh_TW", "el_GR"] as const;
+export type LangType = (typeof acceptedLangs)[number];
diff --git a/src/Intl/strings.json b/src/Intl/strings.json
new file mode 100644
index 0000000..7dd6bc1
--- /dev/null
+++ b/src/Intl/strings.json
@@ -0,0 +1,64 @@
+{
+	"variableNames": ["userName", "content"],
+	"acceptedLangs": ["en_US", "zh_TW", "el_GR"],
+	"en_US": {
+		"homepage": {
+			"userNamePrompt": "Your username: ",
+			"title": "LAN Chat Server",
+			"description": "This web application was built for the purposes of an EPQ project.",
+			"copyrightText": "Copyright 2024 - 2025 Zhongheng Liu @ Byron College",
+			"switchLang": "Switch Language",
+			"newLangPrompt": "Input your ISO-639_ISO-3166 language-contry code below - for example: \"en_US\": "
+		},
+		"chat": {
+			"sendButtonPrompt": "Send",
+			"serverMessage": "Message from $userName: $content",
+			"joinMessage": "$userName joined the server"
+		}
+	},
+	"zh_TW": {
+		"homepage": {
+			"userNamePrompt": "您的用戶名： ",
+			"title": "本地聊天伺服器",
+			"description": "該網絡伺服器應用程式專爲Edexcel Level 3 EPQ而製作",
+			"copyrightText": "版權所有 2024 - 2025 Zhongheng Liu @ Byron College",
+			"switchLang": "切換語言",
+			"newLangPrompt": "在下方輸入您想使用的語言的ISO-639_ISO-3166組合語言代碼 - 例如：\"en_US\"："
+		},
+		"chat": {
+			"sendButtonPrompt": "發送",
+			"serverMessage": "來自 $userName 的訊息：$content",
+			"joinMessage": "$userName 加入了伺服器！"
+		}
+	},
+	"el_GR": {
+		"homepage": {
+			"userNamePrompt": "το όνομα χρήστη σας: ",
+			"title": "Διακομιστής τοπικού δικτύου συνομιλίας",
+			"description": "Αυτή η διαδικτυακή εφαρμογή δημιουργήθηκε για τους σκοπούς ενός έργου EPQ.",
+			"copyrightText": "Πνευματικά δικαιώματα 2024 - 2025 Zhongheng Liu @ Byron College",
+			"switchLang": "Αλλαγή γλώσσας",
+			"newLangPrompt": "Εισαγάγετε τον κωδικό γλώσσας-χώρας ISO-639 ISO-3166 παρακάτω - για παράδειγμα: \"en_US\":"
+		},
+		"chat": {
+			"sendButtonPrompt": "Στείλετε",
+			"joinMessage": "$userName έγινε μέλος του διακομιστή",
+			"serverMessage": "μήνυμα από $userName: $content"
+		}
+	},
+	"ar_SA": {
+		"homepage": {
+			"userNamePrompt": "اسم المستخدم الخاص بك:",
+			"title": "خادم الدردشة LAN",
+			"description": "تم إنشاء تطبيق الويب هذا لأغراض مشروع EPQ.",
+			"copyrightText": "حقوق الطبع والنشر 2024 - 2025 Zhongheng Liu @ كلية بايرون",
+			"switchLang": "تبديل اللغة",
+			"newLangPrompt": "أدخل رمز اللغة ISO-639_ISO-3166 أدناه - على سبيل المثال: \"en_US\":"
+		},
+		"chat": {
+			"sendButtonPrompt": "يرسل",
+			"joinMessage": "$userName انضم إلى الخادم",
+			"serverMessage": "رسالة من $userName: $content"
+		}
+	}
+}
diff --git a/src/context.ts b/src/context.ts
new file mode 100644
index 0000000..f021d13
--- /dev/null
+++ b/src/context.ts
@@ -0,0 +1,4 @@
+import { createContext } from "react";
+import { LangType } from "./Chat/types";
+
+export const LangContext = createContext<LangType>("en_US");
\ No newline at end of file
diff --git a/src/index.tsx b/src/index.tsx
index 1dafd93..afe2f98 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,11 +1,14 @@
-import React from 'react';
-import ReactDOM from 'react-dom/client';
-import './index.css';
-import App from './App';
-
+import React, { createContext } from "react";
+import ReactDOM from "react-dom/client";
+import "./index.css";
+import App from "./App";
+import Wrapper from "./App";
+const LangContext = createContext("en_US");
 const root = ReactDOM.createRoot(
-  document.getElementById('root') as HTMLElement
+	document.getElementById("root") as HTMLElement
 );
 root.render(
-    <App />
-);
\ No newline at end of file
+	<LangContext.Provider value="en_US">
+		<Wrapper />
+	</LangContext.Provider>
+);
diff --git a/tsconfig.json b/tsconfig.json
index a273b0c..2eae7b2 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,26 +1,20 @@
 {
-  "compilerOptions": {
-    "target": "es5",
-    "lib": [
-      "dom",
-      "dom.iterable",
-      "esnext"
-    ],
-    "allowJs": true,
-    "skipLibCheck": true,
-    "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true,
-    "strict": true,
-    "forceConsistentCasingInFileNames": true,
-    "noFallthroughCasesInSwitch": true,
-    "module": "esnext",
-    "moduleResolution": "node",
-    "resolveJsonModule": true,
-    "isolatedModules": true,
-    "noEmit": true,
-    "jsx": "react-jsx"
-  },
-  "include": [
-    "src"
-  ]
+	"compilerOptions": {
+		"target": "es5",
+		"lib": ["dom", "dom.iterable", "esnext"],
+		"allowJs": true,
+		"skipLibCheck": true,
+		"esModuleInterop": true,
+		"allowSyntheticDefaultImports": true,
+		"strict": true,
+		"forceConsistentCasingInFileNames": true,
+		"noFallthroughCasesInSwitch": true,
+		"module": "esnext",
+		"moduleResolution": "node",
+		"resolveJsonModule": true,
+		"isolatedModules": true,
+		"noEmit": true,
+		"jsx": "react-jsx"
+	},
+	"include": ["src"]
 }