// ==UserScript==
// @name         Amazon Video ASIN Display
// @namespace    sac@libidgel.com
// @version      0.0.2
// @description  Show ASINs for episodes and movies/seasons on Amazon Prime Video
// @author       ReiDoBrega
// @license      MIT
// @match        https://www.amazon.com/*
// @match        https://www.amazon.co.uk/*
// @match        https://www.amazon.de/*
// @match        https://www.amazon.co.jp/*
// @match        https://www.primevideo.com/*
// @run-at       document-idle
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
    "use strict";

    let style = document.createElement("style");
    let styleText = document.createTextNode(`
.x-episode-asin {
    margin: 0.5em 0;
    color: #ff0000;
    cursor: pointer; /* Add cursor pointer */
}

.x-page-asin {
    margin: 0.5em 0 1em 0;
    color: #ff0000;
    cursor: pointer; /* Add cursor pointer */
}`);
    style.appendChild(styleText);
    document.head.appendChild(style);

    function addTitleASIN() {
        try {
            let match = document.body.innerHTML.match(/"pageTitleId":"([^"]+)"/);
            if (!match) {
                return;
            }

            let asin = match[1];

            let asinEl = document.querySelector(".x-page-asin");
            if (!asinEl) {
                asinEl = document.createElement("div");
                asinEl.className = "x-page-asin";
            }

            asinEl.textContent = asin;
            asinEl.addEventListener("click", function() {
                copyToClipboard(asin);
            });

            let after = document.querySelector(".dv-dp-node-synopsis, .av-synopsis");
            if (!after) {
                return;
            }

            after.parentNode.insertBefore(asinEl, after.nextSibling);
        } catch (e) {
        }
    }

    function addEpisodeASINs() {
        try {
            document.querySelectorAll("[id^='selector-'], [id^='av-episode-expand-toggle-']").forEach(el => {
                if (el.parentNode.querySelector(".x-episode-asin")) {
                    return; // ASIN already added
                }

                let asin = el.id.replace(/^(?:selector|av-episode-expand-toggle)-/, "");

                let asinEl = document.createElement("div");
                let text = document.createTextNode(asin);
                asinEl.className = "x-episode-asin";
                asinEl.appendChild(text);
                asinEl.addEventListener("click", function() {
                    copyToClipboard(asin);
                });

                let epTitle = el.parentNode.querySelector("[data-automation-id^='ep-title']");
                if (!epTitle) {
                    return;
                }

                epTitle.parentNode.insertBefore(asinEl, epTitle.nextSibling);
            });
        } catch (e) {
        }
    }

    function addASINs() {
        addTitleASIN();
        addEpisodeASINs();
    }

    function debounce(fn, delay) {
        let timeoutID;
        return function() {
            if (timeoutID) {
                clearTimeout(timeoutID);
            }
            timeoutID = setTimeout(() => {
                fn();
                timeoutID = null;
            }, delay);
        };
    }

    const debouncedAddASINs = debounce(addASINs, 300);

    addASINs();
    setTimeout(addEpisodeASINs, 100);

    new MutationObserver(function(mutationsList, observer) {
        debouncedAddASINs();
    }).observe(document.body, { childList: true, subtree: true });

    function copyToClipboard(text) {
        const input = document.createElement("textarea");
        input.value = text;
        document.body.appendChild(input);
        input.select();
        document.execCommand("copy");
        document.body.removeChild(input);
    }

})();