Instagram Unfollower Checker

(() => {

if (window.location.hostname !== "www.instagram.com") {
    alert("กรุณาเปิด Instagram ก่อนใช้งาน");
    location.href = "https://www.instagram.com/";
    return;
}

const fetchOptions = {
    credentials: "include",
    headers: {
        "X-IG-App-ID": "936619743392459"
    }
};

const sleep = (ms) => new Promise(r => setTimeout(r, ms));

const randomDelay = () =>
    Math.floor(Math.random() * 1200) + 800;

const getUserId = async (username) => {

    const response = await fetch(
        `https://www.instagram.com/api/v1/users/web_profile_info/?username=${username}`,
        fetchOptions
    );

    const data = await response.json();

    return data?.data?.user?.id || null;
};

const fetchList = async (type, userId) => {

    let users = [];
    let next = null;

    do {

        const url = next
            ? `https://www.instagram.com/api/v1/friendships/${userId}/${type}/?count=100&max_id=${next}`
            : `https://www.instagram.com/api/v1/friendships/${userId}/${type}/?count=100`;

        const response = await fetch(url, fetchOptions);

        if (!response.ok) {
            throw new Error(
                `Instagram API Error (${response.status})`
            );
        }

        const data = await response.json();

        users.push(...(data.users || []));

        console.log(
            `📦 โหลด ${type}: ${users.length} คน`
        );

        next = data.next_max_id;

        if (next) {
            await sleep(randomDelay());
        }

    } while (next);

    return users;
};

const getFollowers = (id) =>
    fetchList("followers", id);

const getFollowing = (id) =>
    fetchList("following", id);

const checkUnfollowers = async (username) => {

    console.clear();

    console.log(
        `%c🚀 เริ่มตรวจสอบ: ${username}`,
        "font-size:18px;color:#4ade80;font-weight:bold;"
    );

    const userId = await getUserId(username);

    if (!userId) {
        throw new Error("ไม่พบ Username");
    }

    console.log("📥 กำลังโหลด Followers...");
    const followers = await getFollowers(userId);

    console.log("📥 กำลังโหลด Following...");
    const following = await getFollowing(userId);

    const followersSet = new Set(
        followers.map(u =>
            u.username.toLowerCase()
        )
    );

    const notFollowingBack = following.filter(
        user =>
            !followersSet.has(
                user.username.toLowerCase()
            )
    );

    console.clear();

    console.log(
        `%c📊 ผลการตรวจสอบ`,
        "font-size:24px;color:#facc15;font-weight:bold;"
    );

    console.log("━━━━━━━━━━━━━━━━━━━━━━");

    console.log(
        `👥 Followers : ${followers.length}`
    );

    console.log(
        `👤 Following : ${following.length}`
    );

    console.log(
        `❌ ไม่ฟอลกลับ : ${notFollowingBack.length}`
    );

    console.log("━━━━━━━━━━━━━━━━━━━━━━");

    if (notFollowingBack.length === 0) {

        console.log(
            "%c✅ ทุกคนฟอลกลับคุณ",
            "color:#4ade80;font-size:18px;"
        );

        return;
    }

    console.log(
        "%c📋 รายชื่อคนไม่ฟอลกลับ",
        "color:#fb7185;font-size:18px;font-weight:bold;"
    );

    notFollowingBack.forEach((user, index) => {

        console.log(
            `${index + 1}. https://instagram.com/${user.username}`
        );

    });

};

const username =
    prompt("กรอก Username Instagram:");

if (username) {

    checkUnfollowers(username)
        .catch(err => {

            console.error(
                "❌ Error:",
                err.message
            );

        });

}

})();