// ==UserScript==
// @name         Remove Prime Video Watch History with Floating Button
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Adds a floating button to remove all items from your Prime Video watch history with scrolling support, and removes the button when leaving the history page.
// @author       whmcfg
// @match        https://www.primevideo.com/*
// @grant        none
// @license      GNU GPLv3
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    function createButton() {
        // Check if the button already exists
        if (document.querySelector('#removeWatchHistoryButton')) return;

        // Create a floating button
        const button = document.createElement('button');
        button.id = 'removeWatchHistoryButton';
        button.innerText = 'Remove Watch History';
        button.style.position = 'fixed';
        button.style.bottom = '20px';
        button.style.right = '20px';
        button.style.padding = '10px 20px';
        button.style.fontSize = '16px';
        button.style.zIndex = '1000';
        button.style.backgroundColor = '#ff9900';
        button.style.color = '#fff';
        button.style.border = 'none';
        button.style.borderRadius = '5px';
        button.style.cursor = 'pointer';
        button.style.boxShadow = '0 2px 5px rgba(0,0,0,0.3)';

        document.body.appendChild(button);

        button.addEventListener('click', function() {
            button.disabled = true;
            button.innerText = 'Removing...';

            function removeAllWatchHistory() {
                let lastHeight = 0;

                function clickAndScroll() {
                    const removeButtons = document.querySelectorAll('button.SPqQmU._3RF4FN._1D7HW3._2G6lpB.pU0yt1');
                    removeButtons.forEach((button, index) => {
                        setTimeout(() => {
                            button.click();
                            console.log(`Removed item ${index + 1} of ${removeButtons.length}`);
                        }, index * 100);
                    });

                    setTimeout(() => {
                        window.scrollBy(0, document.body.scrollHeight);
                        let newHeight = document.body.scrollHeight;
                        if (newHeight > lastHeight) {
                            lastHeight = newHeight;
                            console.log("Scrolled down to load more videos...");
                            setTimeout(clickAndScroll, 2000);
                        } else {
                            console.log("All items removed from watch history.");
                            button.innerText = 'Done!';
                        }
                    }, removeButtons.length * 100 + 500);
                }

                clickAndScroll();
            }

            removeAllWatchHistory();
        });
    }

    function removeButton() {
        const button = document.querySelector('#removeWatchHistoryButton');
        if (button) {
            button.remove();
        }
    }

    function checkForHistoryPage() {
        const urlIncludesHistory = window.location.href.includes('history');
        if (urlIncludesHistory) {
            createButton();
        } else {
            removeButton();
        }
    }

    // Check initially if the current URL contains "history"
    checkForHistoryPage();

    // Observe changes in the URL to detect navigation
    const observer = new MutationObserver(checkForHistoryPage);
    observer.observe(document.body, { childList: true, subtree: true });
})();