index.js

const express = require("express");
const app = express();
// cors to resolve error
const cors = require("cors");

const PORT = process.env.PORT || 8800;

app.use(cors());
// // socket
// const socketIO = require("socket.io");

// const server = express()
//     .use(app)
//     .listen(8900, () => console.log("Listening Socket on 8900"));

// const io = socketIO(server);

// import libraries
const mongoose = require("mongoose");
const dotenv = require("dotenv");
const helmet = require("helmet");
const morgan = require("morgan");

// multer for uploading images
const multer = require("multer");
const router = express.Router();
const path = require("path");

// Route Configs
const userRoute = require("./routes/users");
const authRoute = require("./routes/auth");
const postRoute = require("./routes/posts");
const conversationRoute = require("./routes/conversations");
const messageRoute = require("./routes/messages");

// setup dotenv
dotenv.config();

// mongoose connection
mongoose.connect(process.env.MONGO_URL, { useNewUrlParser: true }, () => {
    console.log("connected to MongoDB Cloud!");
});

// set REST API path to assets for access from front-end client
// so if user goes to localhost:8800/images/ad.png -> direct user to localhost:8800/public/images/ad.png
app.use("/images", express.static(path.join(__dirname, "public/images")));

// Middleware
app.use(express.json());
app.use(helmet());
app.use(morgan("common"));

// Base examples - not used since we are making Rest API
// app.get("/", (req, res) => {
// 	res.send("Welcome to Home Page");
// });

// app.get("/users", (req, res) => {
// 	res.send("Welcome to Users Page");
// });

// MULTER - storage and file upload
const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, "public/images");
    },
    filename: (req, file, cb) => {
        // req.body.name is coming from clientside user post
        cb(null, req.body.name);
    },
});

const upload = multer({ storage: storage });
app.post("/upload", upload.single("file"), (req, res) => {
    try {
        return res.status(200).json("File uploaded successfully");
    } catch (error) {
        console.error(error);
    }
});

// Set routes
app.use("/auth", authRoute);
app.use("/users", userRoute);
app.use("/posts", postRoute);
app.use("/conversations", conversationRoute);
app.use("/messages", messageRoute);

//////////////////////////////////////////
// SOCKET IO
//////////////////////////////////////////

// const io = require("socket.io")(8900, {
//     cors: {
//         origin: "http://localhost:3000",
//     },
// });

// let users = [];

// const addUser = (userId, socketId) => {
//     !users.some((user) => user.userId === userId) &&
//         users.push({ userId, socketId });
// };

// const removeUser = (socketId) => {
//     users = users.filter((user) => user.socketId !== socketId);
// };

// const getUser = (userId) => {
//     return users.find((user) => user.userId === userId);
// };

// io.on("connection", (socket) => {
//     //when connect
//     console.log("a user connected.");

//     //take userId and socketId from user
//     socket.on("addUser", (userId) => {
//         addUser(userId, socket.id);
//         io.emit("getUsers", users);
//     });

//     //send and get message
//     socket.on("sendMessage", ({ senderId, receiverId, text }) => {
//         const user = getUser(receiverId);
//         io.to(user.socketId).emit("getMessage", {
//             senderId,
//             text,
//         });
//     });

//     //when disconnect
//     socket.on("disconnect", () => {
//         console.log("a user disconnected!");
//         removeUser(socket.id);
//         io.emit("getUsers", users);
//     });
// });

//////////////////////////////////////////
// END SOCKET IO
//////////////////////////////////////////

//////////////////////////////////////////
// HEROKU DEPLOY
//////////////////////////////////////////

if (process.env.NODE_ENV === "production") {
    app.use(express.static(path.join("client/build")));
}

//     app.get("*", (req, res) => {
//         res.sendFile(path.join(__dirname, "client", "build", "index.html"));
//     });
// } else {
//     app.get("/", (req, res) => {
//         res.send("API running");
//     });
// }

// Development - set to listen on port 8800
// app.listen(8800, () => {
//     console.log("Backend server is running!");
// });

// Production
// app.use('/api', router);
app.listen(PORT, console.log(`Server is running on port ${PORT}`));