Added download option for assignment cards

Export PDF Download to hook
Prevented some NaN's

src/pages/api/assignments/[id]/export.tsx

@@ -15,17 +15,14 @@ import { withIronSessionApiRoute } from "iron-session/next";
 import { sessionOptions } from "@/lib/session";
 import ReactPDF from "@react-pdf/renderer";
 import GroupTestReport from "@/exams/pdf/group.test.report";
-import { ref, uploadBytes } from "firebase/storage";
+import { ref, uploadBytes, getDownloadURL } from "firebase/storage";
 import { Stat } from "@/interfaces/user";
 import { User } from "@/interfaces/user";
 import { Module } from "@/interfaces";
 import { ModuleScore, StudentData } from "@/interfaces/module.scores";
-import qrcode from "qrcode";
 import { SkillExamDetails } from "@/exams/pdf/details/skill.exam";
 import { LevelExamDetails } from "@/exams/pdf/details/level.exam";
 import { calculateBandScore, getLevelScore } from "@/utils/score";
-import axios from "axios";
-import { moduleLabels } from "@/utils/moduleUtils";
 import {
   generateQRCode,
   getRadialProgressPNG,
@@ -121,17 +118,25 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
       results: any;
       exams: { module: Module }[];
       startDate: string;
+      pdf?: string;
     };
     if (!data) {
       res.status(400).end();
       return;
     }
 
-    // TODO: Reenable this
-    // if (data.assigner !== req.session.user.id) {
-    //   res.status(401).json({ ok: false });
-    //   return;
-    // }
+    if (data.assigner !== req.session.user.id) {
+      res.status(401).json({ ok: false });
+      return;
+    }
+    if (data.pdf) {
+      // if it does, return the pdf url
+      const fileRef = ref(storage, data.pdf);
+      const url = await getDownloadURL(fileRef);
+
+      res.status(200).end(url);
+      return;
+    }
 
     try {
       const docUser = await getDoc(doc(db, "users", req.session.user.id));
@@ -185,9 +190,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
             (e) => e.module === module
           );
 
-          const bandScore =
+          const baseBandScore =
             moduleResults.reduce((accm, curr) => accm + curr.bandScore, 0) /
             moduleResults.length;
+          const bandScore = isNaN(baseBandScore) ? 0 : baseBandScore;
           const { correct, total } = getScoreAndTotal(moduleResults);
           const png = getRadialProgressPNG("azul", correct, total);
 
@@ -203,7 +209,8 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
         const { correct: overallCorrect, total: overallTotal } =
           getScoreAndTotal(flattenResults);
-        const overallResult = overallCorrect / overallTotal;
+        const baseOverallResult = overallCorrect / overallTotal;
+        const overallResult = isNaN(baseOverallResult) ? 0 : baseOverallResult;
 
         const overallPNG = getRadialProgressPNG(
           "laranja",
@@ -365,7 +372,8 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
         // generate the file ref for storage
         const fileName = `${Date.now().toString()}.pdf`;
-        const fileRef = ref(storage, `assignment_report/${fileName}`);
+        const refName = `assignment_report/${fileName}`;
+        const fileRef = ref(storage, refName);
 
         // upload the pdf to storage
         const pdfBuffer = await streamToBuffer(pdfStream);
@@ -375,9 +383,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
 
         // update the stats entries with the pdf url to prevent duplication
         await updateDoc(docSnap.ref, {
-          pdf: snapshot.ref.fullPath,
+          pdf: refName,
         });
-        res.status(200).end(snapshot.ref.fullPath);
+        const url = await getDownloadURL(fileRef);
+        res.status(200).end(url);
         return;
       }
 
@@ -407,7 +416,9 @@ async function get(req: NextApiRequest, res: NextApiResponse) {
     }
 
     if (data.pdf) {
-      return res.end(data.pdf);
+      const fileRef = ref(storage, data.pdf);
+      const url = await getDownloadURL(fileRef);
+      return res.redirect(url);
     }
 
     res.status(404).end();