More housekeeping

src/pages/(admin)/BatchCodeGenerator.tsx

@@ -1,6 +1,7 @@
 import Button from "@/components/Low/Button";
 import Checkbox from "@/components/Low/Checkbox";
 import {PERMISSIONS} from "@/constants/userPermissions";
+import useUsers from "@/hooks/useUsers";
 import {Type, User} from "@/interfaces/user";
 import {USER_TYPE_LABELS} from "@/resources/user";
 import axios from "axios";
@@ -20,6 +21,8 @@ export default function BatchCodeGenerator({user}: {user: User}) {
 	const [isExpiryDateEnabled, setIsExpiryDateEnabled] = useState(true);
 	const [type, setType] = useState<Type>("student");
 
+	const {users} = useUsers();
+
 	const {openFilePicker, filesContent} = useFilePicker({
 		accept: ".txt",
 		multiple: false,
@@ -41,15 +44,17 @@ export default function BatchCodeGenerator({user}: {user: User}) {
 			const emails = file.content
 				.split("\n")
 				.map((x) => x.trim())
-				.filter((x) => new RegExp(/^[a-zA-Z0-9]+(?:\.[a-zA-Z0-9]+)*@[a-zA-Z0-9]+(?:\.[a-zA-Z0-9]+)*$/).test(x));
+				.filter((x) => new RegExp(/^[a-zA-Z0-9]+(?:\.[a-zA-Z0-9]+)*@[a-zA-Z0-9]+(?:\.[a-zA-Z0-9]+)*$/).test(x))
+				.filter((x) => !users.map((u) => u.email).includes(x));
 
 			if (emails.length === 0) {
-				toast.error("Please upload a .txt file containing e-mails, one per line!");
+				toast.error("Please upload a .txt file containing e-mails, one per line! All already registered e-mails have also been ignored!");
 				return;
 			}
 
 			setEmails([...new Set(emails)]);
 		}
+		// eslint-disable-next-line react-hooks/exhaustive-deps
 	}, [filesContent]);
 
 	const generateCode = (type: Type) => {
@@ -122,7 +127,9 @@ export default function BatchCodeGenerator({user}: {user: User}) {
 					))}
 				</select>
 			)}
-			<Button onClick={() => generateCode(type)}>Generate & Send</Button>
+			<Button onClick={() => generateCode(type)} disabled={emails.length === 0 || (isExpiryDateEnabled ? !expiryDate : false)}>
+				Generate & Send
+			</Button>
 		</div>
 	);
 }