/*
    HOW TO USE THIS PROGRAM
    1. Log in to facebook, and go to your "Activity Feed".
    2. Scroll down a little bit so you have posts on the screen.
    3. Paste this code into the developer console.
    4. Execute deletePost() in the console.
    5. Done; watch as the bot will delete roughly 1 post every 4 seconds.
    6. Refresh the page to disable the script.
*/

function clickConfirmDeleteButton() {
    var confirmDeleteButton = findConfirmDeleteButton();
    // show the user we're about to click this button
    confirmDeleteButton.style.border = "solid 2px red"
    setTimeout(function () {
        // finally we can delete this post
        confirmDeleteButton.click();
        // wait for the post to disappear
        setTimeout(function () {
            // the post was deleted, no need to increment the skip counter
            deletePost()
        }, 4000)
    }, 100)
}

function findConfirmDeleteButton() {
    var elements = document.querySelectorAll('button[type="submit"]');
    for (var i = 0; i < elements.length; i++) {
        if (elements[i].textContent.toLowerCase() === "delete") {
            return elements[i];
        }
    }
    throw new Error("failed to find confirm delete button")
}

function findDeleteButton() {
    var elements = []
    var iterator = document.evaluate("//a[contains(., 'Delete')]", document, null, XPathResult.ANY_TYPE, null);
    var element = null;
    while (element = iterator.iterateNext()) {
        elements.push(element)
    }
    if (elements.length <= 0) {
        throw new Error("did not find delete button")
    }
    return elements[elements.length - 1]
}

function clickDeleteButton() {
    var deleteButton = findDeleteButton()
    // show the user we're about to click this button
    deleteButton.style.border = "solid 2px red"
    setTimeout(function () {
        deleteButton.click()
        setTimeout(clickConfirmDeleteButton, 1000);
    }, 100)
}

function findNextPost() {
    var elements = document.querySelectorAll('[data-tooltip-content="Edit"], [data-tooltip-content="Allowed on timeline"], [data-tooltip-content="Hidden from timeline"]');
    if (elements.length > 0) {
        return elements[0];
    }
    return null;
}

function deletePost() {
    var target = findNextPost()
    if (target) {
        // show the user we're about to click this button
        target.style.border = "solid 2px red";
        setTimeout(function () {
            target.click();
            // don't click that shit again
            target.parentElement.removeChild(target);
            setTimeout(clickDeleteButton, 100);
        }, 100)
    }
    else {
        console.log("failed to find a post, scrolling down and starting over. We might have run out of posts...");
        // this part is annoying because we need to scroll down and wait for new posts to load,
        // so we scroll, wait, scroll, wait, etc...
        setTimeout(function () {
            window.scrollTo(0, document.body.scrollHeight);
            setTimeout(function () {
                window.scrollTo(0, document.body.scrollHeight);
                setTimeout(function () {
                    window.scrollTo(0, document.body.scrollHeight);
                    setTimeout(function () {
                        window.scrollTo(0, document.body.scrollHeight);
                        setTimeout(function () {
                            deletePost()
                        }, 1000)
                    }, 1000);
                }, 1000);
            }, 1000);
        }, 1000);
    }
}