feat: add student history API endpoint

Author: Yashaswini-K-P

package.json

@@ -4,7 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "dev": "node ./server.js"
+  "start": "node index.js",
+  "dev": "nodemon index.js"
   },
   "repository": {
     "type": "git",

server.js

@@ -1,37 +1,100 @@
 const express = require("express");
 const cors = require("cors");
-const path = require("path");
-const fs = require("fs");
+
 const app = express();
 const PORT = process.env.PORT || 3000;
 
 app.use(cors());
-app.use(express.static(path.join(__dirname, "frontend")));
+app.use(express.static("frontend"));
 
+/* ---------------- HOME ROUTES ---------------- */
 app.get("/", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "index.html"));
+  res.sendFile(__dirname + "/frontend/index.html");
 });
 
 app.get("/leaderboard", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "leaderboard.html"));
+  res.sendFile(__dirname + "/frontend/leaderboard.html");
 });
 
 app.get("/about", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "about.html"));
+  res.sendFile(__dirname + "/frontend/about.html");
 });
 
 app.get("/registration", (req, res) => {
-  res.sendFile(path.join(__dirname, "frontend", "registration.html"));
+  res.sendFile(__dirname + "/frontend/registration.html");
 });
 
 app.get("/uptime", (req, res) => {
   res.json({ status: "Website is running ✅" });
 });
 
+/* ---------------- API: STUDENT HISTORY ---------------- */
+app.get("/api/student/:username", async (req, res) => {
+  const { username } = req.params;
+
+  try {
+    console.log("Fetching history for:", username);
+
+    // 1. Get list of all daily files from GitHub repo
+    const apiURL =
+  "https://api.github.com/repos/codepvg/leetcode-ranking-data/contents/daily?ref=main";
+
+    const response = await fetch(apiURL);
+    const files = await response.json();
+
+
+    if (!Array.isArray(files)) {
+      return res.status(500).json({
+        error: "GitHub API failed",
+        details: files.message || files,
+      });
+    }
+
+    let history = [];
+
+    // 2. Loop through each file
+    for (const file of files) {
+      if (!file.name.endsWith(".json")) continue;
+
+      const fileRes = await fetch(file.download_url);
+      const data = await fileRes.json();
+
+      const user = data.find((u) => u.id === username);
+
+      if (user) {
+        const date = file.name.split("-").slice(0, 3).join("-");
+
+        history.push({
+          date,
+          easy: user.data.easySolved,
+          medium: user.data.mediumSolved,
+          hard: user.data.hardSolved,
+        });
+      }
+    }
+
+    // 3. Sort by date
+    history.sort((a, b) => new Date(a.date) - new Date(b.date));
+
+    res.json({
+      username,
+      history,
+    });
+  } catch (err) {
+    console.error(err);
+    res.status(500).json({
+      error: "Failed to fetch student history",
+      details: err.message,
+    });
+  }
+});
+
+/* ---------------- 404 ---------------- */
 app.use((req, res) => {
   res.status(404).send("Page not found");
 });
 
+/* ---------------- START ---------------- */
 app.listen(PORT, () => {
   console.log(`Server running at http://localhost:${PORT}`);
-});
+});