/**
 * Google MyActivity YouTube Comment Deletion Script
 * 
 * Script to assist in bulk deletion of YouTube comments from Google's MyActivity.
 * 
 * Usage:
 * - Navigate to MyActivity YouTube Comments page.
 * - Open browser's developer console.
 * - Copy-paste this script, and follow on-screen prompts.
 * 
 * Features:
 * - Deletes comments from bottom (oldest first).
 * - User control: specify number to delete, or cancel anytime.
 * 
 * Safety:
 * - Halting: 'cancel' during prompt or close tab.
 * 
 * Author: Christian Prior-Mamulyan
 * License: MIT
 * Source: https://gist.github.com/cprima/2f7ea8e353c18a666506021c85e9773d
 * 
 * Use cautiously. Deletion is irreversible.
 */


function navigateToCommentActivityPage() {
    const desiredURL = "https://myactivity.google.com/page?hl=en&utm_medium=web&utm_source=youtube&page=youtube_comments";
    console.warn("The function 'navigateToCommentActivityPage' is deprecated. Please use ensureOnCorrectActivityPage().");
    if (window.location.href !== desiredURL) {
        window.location.href = desiredURL;
        return false;
    }
    return true;
}

function ensureOnCorrectActivityPage() {
    const elementsData = [
        {
            url: "https://myactivity.google.com/page?hl=en&utm_medium=web&utm_source=youtube&page=youtube_comments",
            content: "Your YouTube comments"
        },
        {
            url: "https://myactivity.google.com/page?hl=en&utm_medium=web&utm_source=youtube&page=youtube_live_chat",
            content: "Your YouTube live chat messages"
        },
        {
            url: "https://myactivity.google.com/page?hl=en&utm_medium=web&utm_source=youtube&page=youtube_comment_likes",
            content: "Your Likes and Dislikes on YouTube Comments"
        }
    ];

    const currentUrl = window.location.href;
    const elementsWithClass = Array.from(document.querySelectorAll('.jPCT6'));

    for (let elementData of elementsData) {
        if (currentUrl.startsWith(elementData.url)) {
            if (elementsWithClass.some(el => el.textContent.toLowerCase().includes(elementData.content.toLowerCase()))) {
                console.log(`Matched URL: ${elementData.url} with content: "${elementData.content}"`);
                return true; // Matched desired URL with corresponding content.
            }
        }
    }

    console.log(`You are not on a recognized page. Please navigate to: ${elementsData[0].url}`);
    return false;
}



async function scrollToBottom() {
    while (!document.evaluate('//div[contains(text(), "Looks like you\'ve reached the end")]', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue) {
        window.scrollTo(0, document.body.scrollHeight);
        await new Promise(resolve => setTimeout(resolve, 1000));
    }
}

function highlightElement(el) {
    el.style.backgroundColor = '#ffcccb'; // Light red
    setTimeout(() => {
        el.style.backgroundColor = ''; // Reset background color after 1s
    }, 1000);
}

function determineBestSelector() {
    const SELECTORS = [
        '.VfPpkd-Bz112c-LgbsSe.yHy1rc.eT1oJ.mN1ivc',
        '[aria-label^="Delete activity item"]',
        '[jscontroller="soHxf"]'
    ];

    // Get the selector that matches the least amount of elements (more specific)
    SELECTORS.sort((a, b) => document.querySelectorAll(a).length - document.querySelectorAll(b).length);
    return SELECTORS[0];
}

let deleteButtons = [];

async function deleteComments(deleteBatchSize) {
    const bestSelector = determineBestSelector();
    if (!deleteButtons.length) {
        deleteButtons = [...document.querySelectorAll(bestSelector)]; //.reverse();
    }

    let count = 0;

    while (deleteButtons.length && (count < deleteBatchSize || deleteBatchSize === Infinity)) {
        const btn = deleteButtons.pop();

        // Scroll to the button to make it visible before deletion
        btn.scrollIntoView({
            behavior: 'smooth',
            block: 'center'
        });

        await new Promise(resolve => setTimeout(resolve, 1000)); // Give a moment for the scroll to finish

        highlightElement(btn);
        await new Promise(resolve => setTimeout(resolve, 2000)); // Wait for 2s for the highlight to be visible
        btn.click();
        count++;
        await new Promise(resolve => setTimeout(resolve, 1500));
    }

    return deleteButtons.length; // Return the number of remaining comments
}

async function initiateCommentDeletion() {
    // if (!navigateToCommentActivityPage()) {
    //     return;
    // }
    if (!ensureOnCorrectActivityPage()) {
        return;
    }
    await scrollToBottom();

    const bestSelector = determineBestSelector();
    const totalComments = document.querySelectorAll(bestSelector).length;

    if (!totalComments) {
        console.log("No comments found for deletion.");
        return;
    }

    let userInput = prompt(`Found ${totalComments} comments. Enter 'a' to delete all comments or input a number to delete that many comments. Press 'Cancel' at any time to stop the script:`);

    while (userInput !== null) {
        if (userInput.toLowerCase() === 'a') {
            await deleteComments(Infinity);
            console.log("All comments deleted.");
            return;
        } else if (!isNaN(parseInt(userInput))) {
            const deleteBatchSize = parseInt(userInput);
            const remainingComments = await deleteComments(deleteBatchSize);

            if (!remainingComments) {
                console.log("All comments deleted.");
                return;
            }

            userInput = prompt(`${remainingComments} comments remaining. Enter 'a' to delete all remaining comments or input a number to delete that many comments. Press 'Cancel' at any time to stop the script:`);
        } else {
            userInput = prompt("Invalid input. Please enter 'a' or a number:");
        }
    }

    console.log("Operation canceled. No further comments will be deleted.");
}

initiateCommentDeletion();