find.js

async function find_AIR() {

    document.getElementById("out").innerHTML = "Loading..";

    let username = document.getElementById("username").value;
    username = username.trim();
    let contestId = document.getElementById("contest_id").value;
    contestId = contestId.trim();

    if(username===""){
        document.getElementById("out").innerHTML = "Enter valid username";
        return;
    }

    if (contestId.slice(0, 31) != "https://codeforces.com/contest/") {
        document.getElementById("out").innerHTML = "Entered Link is not correct";
        return;
    }
    contestId = contestId.slice(31);

    let l = 0;

    while ('0' <= contestId[l] && contestId[l] <= '9') l++;

    contestId = contestId.slice(0, l);

    let rank = 0;

    for (let i = 1; i <= 10000; i += 600) {
        let response = await fetch(`https://codeforces.com/api/contest.standings?contestId=${contestId}&from=${i}&count=600&showUnofficial=false`);

        if (!(response.status >= 200 && response.status <= 299)) {
            document.getElementById("out").innerHTML = "Error Occured Server is unavailable refresh and try again or try after some time";
            return;
        }

        response = await response.json();

        let userinfo = "https://codeforces.com/api/user.info?handles=";

        for (let user of response.result.rows)
            userinfo += user.party.members[0].handle + ';';

        response = await fetch(userinfo);

        if (!(response.status >= 200 && response.status <= 299)) {
            document.getElementById("out").innerHTML = "Error Occured Server is unavailable refresh and try again or try after some time";
            return;
        }

        response = await response.json();

        for (let user of response.result) {
            if (user.country === "India") {
                rank++;
                if (user.handle == username) {
                    document.getElementById("out").innerHTML = user.handle + " Your AIR is: " + rank;
                    return;
                }
            }
            if (user.handle == username) {
                if (user.country == undefined)
                    document.getElementById("out").innerHTML = "Username you entered didn't mention his/her country";
                else
                    document.getElementById("out").innerHTML = "Username you entered is not from India";
                return;
            }

        }

    }

    document.getElementById("out").innerHTML = "Not Found";
}