Completed the assignment and implemented all get and post requests

index.js

@@ -1,6 +1,8 @@
 const express = require('express')
 const app = express()
-const port = 3001
+const port = 3000
+
+app.use(express.json());
 
 const USERS = [];
 
@@ -18,56 +20,126 @@ const SUBMISSION = [
 
 ]
 
+let currentUserRole = "";
+
 app.post('/signup', function(req, res) {
   // Add logic to decode body
   // body should have email and password
-
-
   //Store email and password (as is for now) in the USERS array above (only if the user with the given email doesnt exist)
-
-
+  const email = req.body.email;
+  const password = req.body.password;
+  const role = req.body.role;
+
+  if(!email || !password || !role) {
+    return res.status(400).json({msg: "Enter email, password and role"});
+  }
+
+  for(let i = 0; i<USERS.length; i++) {
+	  if(USERS[i].email == email) {
+		  return res.status(409).json({msg: "User already exists"});
+	  }
+  }
+
+  USERS.push({email, password, role});
+
+  res.status(200).json({msg: "User registered"});
   // return back 200 status code to the client
-  res.send('Hello World!')
 })
 
 app.post('/login', function(req, res) {
   // Add logic to decode body
   // body should have email and password
 
+  const email = req.body.email;
+  const password = req.body.password;
+
+   if(!email || !password) {
+    return res.status(400).json({msg: "Enter email and password"});
+  } 
   // Check if the user with the given email exists in the USERS array
   // Also ensure that the password is the same
-
+  for(let i = 0; i<USERS.length; i++) {
+	  if(USERS[i].email == email && USERS[i].password == password) {
+      currentUserRole = USERS[i].role;
+		  return res.status(200).json({msg: "User successfully logged in!"});
+	  }
+  }
+
+  res.status(401).json({msg: "Incorrect email or password entered"});
 
   // If the password is the same, return back 200 status code to the client
   // Also send back a token (any random string will do for now)
   // If the password is not the same, return back 401 status code to the client
 
-
-  res.send('Hello World from route 2!')
 })
 
 app.get('/questions', function(req, res) {
 
   //return the user all the questions in the QUESTIONS array
-  res.send("Hello World from route 3!")
+  const questions = QUESTIONS.map(question => question.title);
+  res.status(200).json(questions);
+
 })
 
 app.get("/submissions", function(req, res) {
    // return the users submissions for this problem
-  res.send("Hello World from route 4!")
+  const problem = req.body.problem;
+  const submissions = SUBMISSION.filter(submission => submission.problem == problem);
+
+
+  if(submissions.length == 0) {
+    return res.status(400).json({msg: "No submissions have been made for this question"});
+  }
+
+  res.status(200).json(submissions);
 });
 
 
 app.post("/submissions", function(req, res) {
    // let the user submit a problem, randomly accept or reject the solution
    // Store the submission in the SUBMISSION array above
-  res.send("Hello World from route 4!")
+  const problem = req.body.problem;
+  if(QUESTIONS.some(question => question.title === problem) == false) {
+    return res.status(400).json({msg: "No such question is present"});
+  }
+
+  let status = Math.floor(Math.random() * 2);
+  if(status === 1) {
+    status = "Accepted";
+  }
+  else {
+    status = "Rejected";
+  }
+
+  SUBMISSION.push({problem, status});
+  res.status(200).json({msg: "Problem successfully submitted!"});
 });
 
 // leaving as hard todos
 // Create a route that lets an admin add a new problem
 // ensure that only admins can do that.
 
+app.post("/questions", function(req, res) {
+  if(currentUserRole != "admin") {
+    return res.status(401).json({msg: "Only admins can add questions"});
+  }
+
+  const title = req.body.title;
+  const description = req.body.description;
+  const testCases = req.body.testCases;
+
+  if(!title || !description || !testCases) {
+    return res.status(400).json({msg: "Please enter title, description and test-cases for the question"});
+  }
+
+  if(QUESTIONS.some(question => question.title === title)) {
+    return res.status(409).json({msg: "Question already exists"});
+  }
+
+  QUESTIONS.push({title, description, testCases});
+  res.status(200).json({msg: "Question successfully submitted"});
+})
+
 app.listen(port, function() {
   console.log(`Example app listening on port ${port}`)
 })