Assignments now generate unique list of exams for each user

src/dashboards/AssignmentCreator.tsx

@@ -46,36 +46,32 @@ export default function AssignmentCreator({isCreating, assignment, assigner, gro
 	};
 
 	const createAssignment = () => {
-		setIsLoading(true);
+    setIsLoading(true);
 
-		const examPromises = selectedModules.map(async (module) => getExam(module, false));
-		Promise.all(examPromises)
-			.then((exams) => {
-				(assignment ? axios.patch : axios.post)(`/api/assignments${assignment ? `/${assignment.id}` : ""}`, {
-					assigner,
-					assignees,
-					name,
-					startDate,
-					endDate,
-					results: [],
-					exams: exams.map((e) => ({module: e?.module, id: e?.id})),
-				})
-					.then(() => {
-						toast.success(`The assignment "${name}" has been ${assignment ? "updated" : "created"} successfully!`);
-						cancelCreation();
-					})
-					.catch((e) => {
-						console.log(e);
-						toast.error("Something went wrong, please try again later!");
-					})
-					.finally(() => setIsLoading(false));
-			})
-			.catch((e) => {
-				console.log(e);
-				toast.error("Something went wrong, please try again later!");
-				setIsLoading(false);
-			});
-	};
+    (assignment ? axios.patch : axios.post)(
+      `/api/assignments${assignment ? `/${assignment.id}` : ""}`,
+      {
+        assignees,
+        name,
+        startDate,
+        endDate,
+		selectedModules
+      }
+    )
+      .then(() => {
+        toast.success(
+          `The assignment "${name}" has been ${
+            assignment ? "updated" : "created"
+          } successfully!`
+        );
+        cancelCreation();
+      })
+      .catch((e) => {
+        console.log(e);
+        toast.error("Something went wrong, please try again later!");
+      })
+      .finally(() => setIsLoading(false));
+  };
 
 	const deleteAssignment = () => {
 		if (assignment) {

src/interfaces/results.ts

@@ -19,7 +19,7 @@ export interface Assignment {
 		type: "academic" | "general";
 		stats: Stat[];
 	}[];
-	exams: {id: string; module: Module}[];
+	exams: {id: string; module: Module, assignee: string}[];
 	startDate: Date;
 	endDate: Date;
 }

src/pages/api/assignments/index.ts

@@ -5,6 +5,10 @@ import {getFirestore, collection, getDocs, query, where, setDoc, doc} from "fire
 import {withIronSessionApiRoute} from "iron-session/next";
 import {sessionOptions} from "@/lib/session";
 import {uuidv4} from "@firebase/util";
+import { Module } from "@/interfaces";
+import { getExams } from "@/utils/exams.be";
+import { Exam } from "@/interfaces/exam";
+import { flatten } from "lodash";
 
 const db = getFirestore(app);
 
@@ -34,8 +38,65 @@ async function GET(req: NextApiRequest, res: NextApiResponse) {
 	res.status(200).json(docs);
 }
 
-async function POST(req: NextApiRequest, res: NextApiResponse) {
-	await setDoc(doc(db, "assignments", uuidv4()), {assigner: req.session.user?.id, ...req.body});
-
-	res.status(200).json({ok: true});
+interface ExamWithUser {
+  module: Module;
+  id: string;
+  assignee: string;
+}
+
+function getRandomIndex(arr: any[]): number {
+  const randomIndex = Math.floor(Math.random() * arr.length);
+  return randomIndex;
+}
+
+async function POST(req: NextApiRequest, res: NextApiResponse) {
+  const { selectedModules, assignees, ...body } = req.body as {
+    selectedModules: Module[];
+    assignees: string[];
+  };
+
+  // for optimization purposes, it would be better to create a new endpoint that returned the answers for all users at once
+  const allExams = await assignees.map(async (assignee) => {
+    const selectedModulePromises = await selectedModules.map(
+      async (module: Module) => {
+        try {
+          const exams: Exam[] = await getExams(db, module, "true", assignee);
+
+          const exam = exams[getRandomIndex(exams)];
+          if (exam) {
+            return { module: exam.module, id: exam.id, assignee };
+          }
+          return null;
+        } catch (e) {
+          console.error(e);
+          return null;
+        }
+      },
+      []
+    );
+    const newModules = await Promise.all(selectedModulePromises);
+
+    return newModules;
+  }, []);
+
+  const exams = flatten(await Promise.all(allExams)).filter(
+    (x) => x !== null
+  ) as ExamWithUser[];
+
+  if (exams.length === 0) {
+    res
+      .status(400)
+      .json({ ok: false, error: "No exams found for the selected modules" });
+    return;
+  }
+
+  await setDoc(doc(db, "assignments", uuidv4()), {
+    assigner: req.session.user?.id,
+    assignees,
+    results: [],
+    exams,
+    ...body,
+  });
+
+  res.status(200).json({ ok: true });
 }