Added initial group report pdf

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

@@ -25,6 +25,11 @@ import { LevelExamDetails } from "@/exams/pdf/details/level.exam";
 import { calculateBandScore } from "@/utils/score";
 import axios from "axios";
 import { moduleLabels } from "@/utils/moduleUtils";
+import {
+  generateQRCode,
+  getRadialProgressPNG,
+  streamToBuffer,
+} from "@/utils/pdf";
 
 const db = getFirestore(app);
 
@@ -35,21 +40,6 @@ async function handler(req: NextApiRequest, res: NextApiResponse) {
   if (req.method === "POST") return post(req, res);
 }
 
-export const streamToBuffer = async (
-  stream: NodeJS.ReadableStream
-): Promise<Buffer> => {
-  return new Promise((resolve, reject) => {
-    const chunks: Buffer[] = [];
-    stream.on("data", (data) => {
-      chunks.push(data);
-    });
-    stream.on("end", () => {
-      resolve(Buffer.concat(chunks));
-    });
-    stream.on("error", reject);
-  });
-};
-
 const getExamSummary = (score: number) => {
   if (score > 0.8) {
     return "Scoring between 81% and 100% on the English exam demonstrates an outstanding level of proficiency in writing, speaking, listening, and reading. Mastery of key concepts is evident across all language domains, showcasing not only a high level of skill but also a dedication to excellence. Continuing to challenge oneself with advanced material in writing, speaking, listening, and reading will further refine the already impressive command of the English language.";
@@ -137,33 +127,6 @@ const handleSkillsFeedbackRequest = async (
   }
 };
 
-const generateQRCode = async (link: string) => {
-  try {
-    const qrCodeDataURL = await qrcode.toDataURL(link);
-    return qrCodeDataURL;
-  } catch (error) {
-    console.error("Error generating QR code:", error);
-    return null;
-  }
-};
-
-// Radial Progress PNGs were generated with only two colors
-// and they use some baseline score (10%, 20%, 30%..)
-type RADIAL_PROGRESS_COLOR = "laranja" | "azul";
-
-const getRadialProgressPNG = (
-  color: RADIAL_PROGRESS_COLOR,
-  score: number,
-  total: number
-) => {
-  // calculate the percentage of the score
-  // and round it to the closest available image
-  const percent = (score / total) * 100;
-  const remainder = percent % 10;
-  const roundedPercent = percent - remainder;
-  return `public/radial_progress/${color}_${roundedPercent}.png`;
-};
-
 async function post(req: NextApiRequest, res: NextApiResponse) {
   // verify if it's a logged user that is trying to export
   if (req.session.user) {
@@ -178,7 +141,7 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
     );
 
     if (docsSnap.empty) {
-      res.status(404).end();
+      res.status(400).end();
       return;
     }
 
@@ -288,10 +251,6 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
           return result;
         });
 
-        // generate the file ref for storage
-        const fileName = `${Date.now().toString()}.pdf`;
-        const fileRef = ref(storage, `exam_report/${fileName}`);
-
         // calculate the overall score out of all the aggregated results
         const overallScore = results.reduce(
           (accm, { score }) => accm + score,
@@ -352,6 +311,10 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
           />
         );
 
+        // generate the file ref for storage
+        const fileName = `${Date.now().toString()}.pdf`;
+        const fileRef = ref(storage, `exam_report/${fileName}`);
+
         // upload the pdf to storage
         const pdfBuffer = await streamToBuffer(pdfStream);
         const snapshot = await uploadBytes(fileRef, pdfBuffer, {
@@ -376,7 +339,7 @@ async function post(req: NextApiRequest, res: NextApiResponse) {
     }
   }
 
-  res.status(500).json({ ok: false });
+  res.status(401).json({ ok: false });
   return;
 }