Full Stack Assignment done from the video 1 of the full stack series

index.js

@@ -21,50 +21,95 @@ const SUBMISSION = [
 app.post('/signup', function(req, res) {
   // Add logic to decode body
   // body should have email and password
+  const{email, password,admin} = req.body;
+  //the admin here is a bool value which can be used further whenever questions have to be created
 
+  //Store email and password (as it is for now) in the USERS array above (only if the user with the given email doesnt exist)
+  const userExists=USERS.some(user=>user,email===email);
 
-  //Store email and password (as is for now) in the USERS array above (only if the user with the given email doesnt exist)
-
+  //if user exists then-
+  if(userExists){
+    return res.status(400).send("user already exists");
+  }
 
+  //if user does not exist then-
+  //storing the new user's email and password in the USERS array above
+  USERS.push({email,password,admin});
   // return back 200 status code to the client
-  res.send('Hello World!')
+  res.status(200).send("signed up successfully")
 })
 
 app.post('/login', function(req, res) {
   // Add logic to decode body
   // body should have email and password
+  const {email, password} = req.body;
 
   // Check if the user with the given email exists in the USERS array
+  const userExists = USERS.some(user=>user.email===email);
+  if(userExists){
+    return res.status(200).send("user exists and can be logged in");
+  }
+
   // Also ensure that the password is the same
+  const isSamePassword =USERS.some(user=>user.password===password);
 
 
   // 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
+  // Also sent back a token - "abc" 
+  if(isSamePassword){
+    const token="abc";
+    return res.status(200).send(token);
+  }
 
-
-  res.send('Hello World from route 2!')
+
+  // If the password is not the same, return back 401 status code to the client
+  if(!isSamePassword){
+    return res.status(401).send("invalid password");
+  }
 })
 
 app.get('/questions', function(req, res) {
 
   //return the user all the questions in the QUESTIONS array
-  res.send("Hello World from route 3!")
+  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!")
+
 });
 
+function getRandomAcceptance() {
+  return Math.random() >= 0.5; // 50% chance of acceptance
+}
 
 app.post("/submissions", function(req, res) {
    // let the user submit a problem, randomly accept or reject the solution
+   const{problemId,user,code}=req.body;
+
    // Store the submission in the SUBMISSION array above
-  res.send("Hello World from route 4!")
+  const newSubmission={
+    id:SUBMISSIONS.length+1,//generated new id
+    problemId,
+    user,
+    code,
+    isAccepted:getRandomAcceptance()
+
+  }
 });
 
-// leaving as hard todos
+
+app.post("/addProblem",function(req,res){
+ const{admin}=req.body;
+
+ if(!admin){
+  return res.status(403).send("only admins can add problems");
+ }
+
+ res.status(200).send("you are an admin");
+})
+
 // Create a route that lets an admin add a new problem
 // ensure that only admins can do that.