index.js

// import {log} from './log.js';
require("dotenv").config();
const path = require("path")
const express = require("express");
const app = express();
const http = require("http");

const server = http.createServer(app);
const port = process.env.PORT || 3000;

const { Server } = require("socket.io");
const io = new Server(server);

app.use(express.static("public"));

/* Commented the below code because express.static("public") is serving the index.html file.
app.get('/', (req,res) => {
    res.sendFile("public/index-script.js")

}); 
*/

// Global variables.

let BotHelloMessage = `<b>
    Hello Dear,</b>
`
let options = `<div>
    Select <b>1</b> to Place an order.</br>
    Select <b>97</b> to see current order.</br>
    Select <b>98</b> to see order history.</br>
    Select <b>99</b> to checkout order.</br>
    Select <b>0</b> to cancel order.</div>
`

const menu = {
    1: "Pizza",
    2: "Shawarma",
    3: "Rice and Chicken",
    4: "Meat Pie",
    5: "Fish Pepper Soup"
}

const order = [];

io.on("connection", async (socket)=>{
    console.log(`client connected.`);
    
    // Handle bot reply for empty order.
    function emptyOrderRespnse(type){
        socket.emit("empty order", `<p><b>You do not have ${type==97 && "any order yet." 
        || type==98 && "order history." 
        || type==99&& "any order to checkout." 
        || type==0 && "any order to cancle."}</b><p/>`
        );
        socket.emit("empty order", options);
        return
    } 
    
    socket.emit("botHello", BotHelloMessage);
    socket.emit("menuOptions", options);

    socket.on("disconnect", async ()=>{
        console.log("client disconnected.")
    });

    // Bot reply for placing order.
    socket.on("1", async() =>{
        socket.emit("menu", menu);
    });

    // Bot reply for current order.
    socket.on("97", async() =>{
        if(order.length == 0){
            emptyOrderRespnse(97)
        }
    });

    // Bot reply for order history.
    socket.on("98", async() =>{
        if(order.length == 0){
            emptyOrderRespnse(98)
        }
    });
    
    // Bot reply for checkout order.
    socket.on("99", async() =>{
        if(order.length == 0){
            emptyOrderRespnse(99)
        }
    });

    // Bot reply for checkout order.
    socket.on("0", async() =>{
        if(order.length == 0){
            emptyOrderRespnse(0)
        }
    });

});


server.listen(port, ()=> {
console.log(`Server Running on port ${port}...`);
});

// const express = require("express");
// const session = require("express-session");
// const http = require("http");
// const { Server } = require("socket.io");

// const app = express();
// const server = http.createServer(app);
// const io = new Server(server);

// const fastFoods = {
//   2: "Item1",
//   3: "Item2",
//   4: "Item3",
//   5: "Item4",
// };

// const orderHistory = [];

// const sessionMiddleware = session({
//   secret: "secret-key",
//   resave: false,
//   saveUninitialized: true,
// });

// app.use(express.static("public"));
// app.use(sessionMiddleware);

// app.get("/", async (req, res) => {
//   try {
//     res.sendFile(__dirname + "/index.html");
//   } catch (err) {
//     console.log(err);
//     res.status(500).send("Error serving restaurant.html");
//   }
// });

// io.use((socket, next) => {
//   sessionMiddleware(socket.request, socket.request.res, next);
// });

// io.on("connection", (socket) => {
//   console.log("User connected:", socket.id);

//   const state = {
//     userName: "",
//     currentOrder: [],
//   };

//   const botMessage = async (message) => {
//     console.log("Bot message received:", message);
//     socket.emit("bot-message", message);
//   };

//   const userMessage = async (message) => {
//     console.log("User message received:", message);

//     try {
//       if (!state.userName) {
//         // Save the user's name and update the welcome message
//         state.userName = message;
//         await botMessage(
//           `Welcome to the ChatBot, ${state.userName}! Place an order\n
//1. Typehere\n9
//9. Typehere\n
//98. Typehere\n97. Typehere\n0. Cancel order`
//         );
//       } else {
//         switch (message) {
//           case "1":
//             // Generate the list of items dynamically
//             const itemOptions = Object.keys(fastFoods)
//               .map((key) => `${key}. ${fastFoods[key]}`)
//               .join("\n");
//             await botMessage(
//               `Here is a list of items you can order:\n ${itemOptions} \nPlease select one by typing its number.`
//             );
//             break;
//           case "2":
//           case "3":
//           case "4":
//           case "5":
//             // Parse the number from the user input and add the corresponding item to the current order
//             const selectedIndex = parseInt(message);
//             if (fastFoods.hasOwnProperty(selectedIndex)) {
//               const selectedItem = fastFoods[selectedIndex];
//               state.currentOrder.push(selectedItem);
//               await botMessage(
//                 `${selectedItem} has been added to your order. Do you want to add more items to your order? Type numbers. If not, type 99 to checkout.`
//               );
//             } else {
//               await botMessage("Invalid selection.");
//             }
//             break;
//           case "99":
//             if (state.currentOrder.length === 0) {
//               await botMessage(
//                 "No order to place. Place an order\n1. See menu"
//               );
//             } else {
//               orderHistory.push(state.currentOrder);
//               await botMessage("Order placed");
//               state.currentOrder = [];
//             }
//             break;
//           case "98":
//             if (orderHistory.length === 0) {
//               await botMessage("No previous orders");
//             } else {
//               const orderHistoryString = orderHistory
//                 .map(
//                   (order, index) => `Order ${index + 1}. ${order.join(", ")}`
//                 )
//                 .join("\n");
//               await botMessage(
//                 `Here are your previous orders:\n${orderHistoryString}`
//               );
//             }
//             break;
//           case "97":
//             if (state.currentOrder.length === 0) {
//               await botMessage("No current order");
//             } else {
//               const currentOrderString = state.currentOrder.join(", ");
//               await botMessage(
//                 `Here is your current order:\n${currentOrderString}`
//               );
//             }
//             break;
//           case "0":
//             if (state.currentOrder.length === 0) {
//               await botMessage("No order to cancel");
//             } else {
//               state.currentOrder = [];
//               await botMessage("Order canceled");
//             }
//             break;
//           default:
//             await botMessage("Invalid input");
//         }
//       }
//     } catch (err) {
//       console.log(err);
//       await botMessage("An error occurred while processing your request.");
//     }
//   };

//   socket.on("user-message", userMessage);

//   socket.on("disconnect", () => {
//     console.log("User disconnected:", socket.id);
//   });
// });

// server.listen(3000, () => {
//   console.log("Listening on http://localhost:3000");
// });