index.js

const app = require('express')();
const server = require("http").createServer(app);
const cors = require("cors");

const io = require("socket.io")(server, {
    cors: {
        origin: "*",
        methods: ["GET", "POST"]
    }
})

app.use(cors());

const PORT = process.env.PORT || 5000;

app.get("/", (req, res) => {
    res.send(`Server is running on PORT:${PORT}.`);
})

app.get("/questions", async (req, res) => {
    let query = `query problemList {
                    problems {
                        prob_title
                        prob_id
                    }
                    }   
       `

    let response = await fetch(`https://api-ap-south-1.hygraph.com/v2/clx0g9rkn04qv07w8t1mdf12x/master?query=${query}`, {
        method: "GET",
    });

    const data = await response.json();
    if (!data.data.problems) {
        res.status(404).send("API is down.")
        return;
    }
    // console.log(data.data.problems.length)
    res.send(data.data.problems);
})
app.get("/ques/:id", async (req, res) => {
    const id = req.params.id;
    let query = `query Problems {
        problem(where: {prob_id: ${id}}) {
          prob_id
          prob_title
          difficulty
          problemStatement
          inputFormat
          outputFormat
          constraints
          testcases {
            tc_id
            tc_input
            tc_output
            tc_explanation
            image
            isHidden
          }
        }
      }
       `

    let response = await fetch(`https://api-ap-south-1.hygraph.com/v2/clx0g9rkn04qv07w8t1mdf12x/master?query=${query}`, {
        method: "GET",
    });

    const data = await response.json();
    if (!data.data.problem) {
        res.status(404).send("Problem not found")
        return;
    }
    res.send(data.data.problem);
})

io.on('connection', (socket) => {
    socket.emit('me', socket.id);

    socket.on('disconnect', () => {
        socket.broadcast.emit("callended");
    })

    socket.on('calluser', ({ userToCall, signalData, from, name }) => {
        io.to(userToCall).emit("calluser", { signal: signalData, from, name });
    })

    socket.on('answercall', (data) => {
        io.to(data.to).emit("callaccepted", data.signal)
    })
    socket.on('codeShare', (data) =>{
        io.to(data.to).emit("codeShare", data.code)
    })
    socket.on('results', (data) =>{
        io.to(data.to).emit("results", data.results)
    })
})



server.listen(PORT, () => console.log(`Server listening on PORT:${PORT}`))