Login backend code started

Site reacts correctly to different inputs with login

package.json

@@ -7,14 +7,22 @@
         "dev": "next dev --turbopack",
         "build": "next build",
         "start": "next start",
-        "lint": "next lint"
+        "lint": "next lint",
+        "start:server": "dist/index.js"
     },
     "dependencies": {
         "@prisma/client": "^6.4.1",
         "@types/mapbox-gl": "^3.4.1",
+        "bcryptjs": "^3.0.2",
+        "body-parser": "^2.2.0",
+        "csv-parser": "^3.2.0",
+        "express": "^5.1.0",
+        "fs": "^0.0.1-security",
+        "jwt-decode": "^4.0.0",
         "leaflet": "^1.9.4",
         "mapbox-gl": "^3.10.0",
         "next": "15.1.7",
+        "path": "^0.12.7",
         "prisma": "^6.4.1",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
@@ -24,6 +32,7 @@
     },
     "devDependencies": {
         "@eslint/eslintrc": "^3",
+        "@types/express": "^5.0.1",
         "@types/node": "^20",
         "@types/react": "^19",
         "@types/react-dom": "^19",

src/app/api/login/route.ts

@@ -0,0 +1,72 @@
+import { NextResponse } from "next/server";
+import path from "path";
+import fs from "fs";
+import csv from "csv-parser";
+
+type User = {
+  name: string;
+  email: string;
+  password: string;
+}
+
+/**
+ * @returns {array} - Array of Objects containing user data
+ */
+async function readUserCsv(): Promise<User[]>{
+  return new Promise((resolve, reject) => {
+  // Dynamic csv location generation
+  let csvPath = path.dirname(__dirname); // /login
+  csvPath = path.dirname(csvPath); // /api
+  csvPath = path.dirname(csvPath); // /app
+  csvPath = path.dirname(csvPath); // /src
+  csvPath = path.dirname(csvPath); // /[project] // ? not sure why this dirfolder is here...
+  csvPath = path.dirname(csvPath); // /termor-tracker
+  csvPath = path.join(csvPath,"src","databases","Users.csv");
+  //Forms array for user data
+  let results : User[] = [];
+
+  //Reads data and adds it to results
+  fs.createReadStream(csvPath)
+    .pipe(csv())
+    .on("data", (data) => results.push(data))
+    .on("end", () => {
+      resolve(results)
+    })
+    .on("error", (error) => {
+      reject(error)
+    })
+
+  });
+}
+
+function findUserByEmail(users: User[], email: string): User | undefined {
+  return users.find((user) => user.email === email);
+}
+
+export async function POST(request: Request) {
+  try {
+    const body = await request.json(); // Parse incoming JSON data
+    const {email, password } = body;
+    console.log("Login API received data");
+
+    const userData = await readUserCsv();
+
+    console.log(userData)
+    console.log("Email:", email); // ! remove
+    console.log("Password:", password);// ! remove
+
+    const foundUser = findUserByEmail(userData,email)
+    if (foundUser && foundUser.password === password) {
+      console.log("User Details Correct")
+      return NextResponse.json({ message: "Login successful!" }, { status: 200 });
+    } else {
+      console.log("User email or password is invalid")
+      return NextResponse.json({ message: "Email and/or password are invalid" }, { status: 401 });
+    }
+
+
+  } catch (error) {
+    console.error("Error in signup endpoint:", error);
+    return NextResponse.json({ message: "Internal Server Error" }, { status: 500 });
+  }
+}

src/app/api/signup/route.ts

@@ -0,0 +1,19 @@
+import { NextResponse } from "next/server";
+
+export async function POST(request: Request) {
+  try {
+    const body = await request.json(); // Parse incoming JSON data
+    const { name, email, password } = body;
+
+    console.log("Signup API received data:");
+    console.log("Name:", name);
+    console.log("Email:", email);
+    console.log("Password:", password);
+
+    // For now, just respond back with a success message
+    return NextResponse.json({ message: "Signup successful!" }, { status: 201 });
+  } catch (error) {
+    console.error("Error in signup endpoint:", error);
+    return NextResponse.json({ message: "Internal Server Error" }, { status: 500 });
+  }
+}

src/components/AuthModal.tsx

@@ -1,51 +1,102 @@
+// tells React if you're using its "server-side rendering" features. this component runs only on the client-side (browser)
 "use client";
-
+// importing React hooks or utilities that enhance functionality inside the component
 import { useState, FormEvent, useRef, MouseEvent, useEffect } from "react";
+/*
+  useState: Used to manage state (data that changes over time).
+  FormEvent: TypeScript definition for form-related events like submission.
+  useRef: Used to access the DOM (the web page elements) directly.
+  MouseEvent: TypeScript definition for mouse-related events like clicks.
+  useEffect: Hook for running side effects (e.g., code that runs when something changes)
+*/
 
+// defining a type for the props (inputs) that AuthModal expects
 interface AuthModalProps {
-  isOpen: boolean;
-  onClose: () => void;
+  isOpen: boolean; // bool for if the modal should be visible
+  onClose: () => void; //A function that will be executed to close the modal
 }
-
-export default function AuthModal({ isOpen, onClose }: AuthModalProps) {
+// creates a React functional component
+export default function AuthModal({ isOpen, onClose }: AuthModalProps) { //AuthModalProps ensures TypeScript validates the props to match the type definition above
   const [isLogin, setIsLogin] = useState<boolean>(true);
   const modalRef = useRef<HTMLDivElement>(null);
+  const [isFailed, setIsFailed] = useState<boolean>(false);
+/*
+    useState is a React Hook that declares state variables in a functional component. It returns a two-element array
+    The state variable (isLogin) : Represents the current state value (e.g., true initially). This is the value you can use in your component.
+    The state updater function (setIsLogin) : A function that allows you to update the state variable. React takes care of re-rendering the component when the state is updated
+*/
+/*
+  modalRef allows direct access to the modal DOM element (the container div for the modal). This is useful for detecting if the user clicks outside of the modal
+*/
 
+// useEffect runs code after the component renders or when a dependency changes (in this case, isOpen as seen in the end [])
   useEffect(() => {
-    if (isOpen) setIsLogin(true);
+    if (isOpen) setIsLogin(true); // runs when isOpen changes, if it is true, the login is shown
   }, [isOpen]);
 
-  if (!isOpen) return null;
+  if (!isOpen) return null; // if is open is false, the model isnt shown
 
+  // this is an arrow function. e: is used to specify that an event object is expected 
   const handleOverlayClick = (e: MouseEvent<HTMLDivElement>) => {
     if (modalRef.current && !modalRef.current.contains(e.target as Node)) {
       onClose();
     }
   };
 
-  const handleSubmit = async (e: FormEvent<HTMLFormElement>) => {
-    e.preventDefault();
-    const formData = new FormData(e.currentTarget);
-    const email = formData.get("email") as string;
-    const password = formData.get("password") as string;
-    const name = isLogin ? undefined : (formData.get("name") as string);
+  /*
+    .current gives a reference to the actual DOM element (the inner modal container)
+    e.target refers to the specific element the mouse click event occurred on
+    .contains(e.target) checks if the clicked element (e.target) is inside the modal (modalRef.current)
+    as Node specifies e.target is a Node type to TypeScript
+    ? what is a node
+    /!... means we get true if the click is outside the modal
+    Logic : if modalRef.current exists and the click target (e.target) is not inside the modal , then the condition is true
+      This means the user clicked outside the modal
+  */
+ 
+// LS - The following bit contains the more important code for what I'm focused on
+/*
+  Note : handleSubmit is typically used as a event handler for submitting a form in react.
+  For example:
+    <form onSubmit={handleSubmit}>
+      <input type="text" name="example" />
+      <button type="submit">Submit</button>
+    </form>
+*/
+/*
+  e is the parameter passsed into the function
+  async indicates the function runs asyncronously, meaning it performs tasks which take time.
+  an example of this would be API calls
+*/
+  const handleSubmit = async (e: FormEvent<HTMLFormElement>) => {
+    e.preventDefault(); // stops page from refreshing
+    setIsFailed(false)
+    const formData = new FormData(e.currentTarget); // new variable of class FormData is created. This is part of the standard Web API included in modern web browsers
+    const email = formData.get("email") as string; // gets email from form response
+    const password = formData.get("password") as string; // gets password from form response
+    const name = isLogin ? undefined : (formData.get("name") as string);// if the form is in login mode, the name is undefine, otherwise the name is a value obtained from the response
+
+    let endpoint = isLogin ? "/api/login" : "/api/signup"; // sets endpoint for backend code (either sign up or login)
+    const body = isLogin ? { email, password } : { name: name!, email, password };// creates a json body for the backend
     
-    const endpoint = isLogin ? "/api/login" : "/api/signup";
-    const body = isLogin ? { email, password } : { name: name!, email, password };
 
     try {
-      const res = await fetch(endpoint, {
-        method: "POST",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify(body),
+      console.log("Sending data to API");
+      const res = await fetch(endpoint, { // sends a request to the server at the end point
+        method: "POST", // Post is used since the form submission modifies the server side state
+        headers: { "Content-Type": "application/json" }, //indicates it expects a json object returned
+        body: JSON.stringify(body), // converts the body to a JSON string to be sent
       });
-      if (res.ok) {
+      if (res.ok) { //res.ok checks if the response is between 200-299
         console.log("Success!");
-        onClose();
-      } else {
-        console.error("Error:", await res.text());
+        onClose(); // closes UI
+      } else if (res.status === 401){
+        console.log("Incorrect details provided")
+        setIsFailed(true)
+      } else{
+        console.error("Error:", await res.text()); // logs error with error message sent to console
       }
-    } catch (error) {
+    } catch (error) {// catches any errors (e.g. Not connected to network)
       console.error("Request failed:", error instanceof Error ? error.message : String(error));
     }
   };
@@ -89,6 +140,14 @@ export default function AuthModal({ isOpen, onClose }: AuthModalProps) {
               required
             />
           </div>
+          <div>
+            { isFailed && (
+              <div>
+                <label className="block text-sm font-medium text-red-700">Incorrect email or password</label>
+              </div>
+            )
+            }
+          </div>
           <button type="submit" className="w-full bg-blue-600 text-white p-2 rounded-md hover:bg-blue-700 transition">
             {isLogin ? "Login" : "Sign Up"}
           </button>

src/databases/Users.csv

@@ -1 +1,5 @@
-Users
+name,email,password
+Lukeshan Thananchayan,lukeshan@mail.com,TaylorSwift123
+Emily Neighbour Carter,emily@mail.com,HarryStyles000
+Izzy Patteron,izzy@mail.com,OliviaRodrigez420
+Tim Howitz,tim@mail.com,TravisBarker182