(function() {
    'use strict';
    let messageID = "000000000000000000";
    let authToken = "NTQ3MjE0ODYyMzEzNDU1NjI2.";


    const channelID = window.location.href.split('/').pop();
    const frame = document.body.appendChild(document.createElement("iframe"));
    const cloneLS = JSON.parse(JSON.stringify(frame.contentWindow.localStorage));
    frame.parentNode.removeChild(frame);
    const userID = cloneLS.user_id_cache.replace(/"/g, "");

    if (authToken === "YOUR_AUTH_TOKEN") {
        if (!cloneLS.hasOwnProperty('token')) {
            window.alert("Failed to retrieve your auth token from localStorage, try pasting it into this script manually.\nInstructions to find your auth token are provided in this script.");
            return;
        }
        authToken = cloneLS.token.replace(/"/g, "");
    }
	console.log("Your Discord account's auth token is:\n" + authToken);

    let msgCount = 0;
    const interval = 500;

    let delay = (duration) => {
        return new Promise((resolve, reject) => {
            setTimeout(() => resolve(), duration);
        });
    }

    let clearMessages = () => {
        const baseURL = "https://discordapp.com/api/channels/" + channelID + "/messages";
        const headers = {
            "Authorization": authToken
        };

        let clock = 0;

        window.fetch(baseURL + "?before=" + messageID, {
                headers,
                method: 'GET'
            })
            .then((resp) => resp.json())
            .then((messages) => {
                if (typeof messages === "undefined" || !messages.hasOwnProperty('length')) {
                    window.alert("Failed to retrieve messages! Try refreshing the page, then running the script again.");
                    return true;
                } else if (messages.length === 0) {
                    window.alert("All Skids!\nTotal Messages Deleted: " + msgCount);
                    return true;
                }
                return Promise.all(messages.map(
                    (message) => {
                        messageID = message.id;
                        if (message.author.id === userID) {
                            msgCount++;
                            const msgNumber = msgCount;
                            console.log("Found message #" + msgNumber);
                            return delay(clock += interval)
                                .then(() => {
                                    console.log("Deleting message " + msgNumber + "/" + msgCount);
                                    fetch(`${baseURL}/${message.id}`, {
                                        headers,
                                        method: 'DELETE'
                                    });
                                });
                        } else {
                            console.log("Skipped message from other user.");
                            return;
                        }
                    }));
            })
            .then((isFinished) => {
                if (isFinished === true) {
                    return;
                }
                clearMessages();
            });
    }
    clearMessages();
})();