// ==UserScript==
// @name         Amazon Product Price Loader (Optimized)
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Load Amazon product pages and display price in a tooltip
// @license      MIT https://opensource.org/licenses/MIT
// @match        https://sellercentral.amazon.com/*
// @match        https://sellercentral.amazon.co.uk/*
// @match        https://sellercentral.amazon.de/*
// @match        https://sellercentral.amazon.fr/*
// @match        https://sellercentral.amazon.it/*
// @match        https://sellercentral.amazon.es/*
// @match        https://sellercentral.amazon.ca/*
// @match        https://sellercentral.amazon.com.mx/*
// @match        https://sellercentral.amazon.com.br/*
// @match        https://sellercentral.amazon.co.jp/*
// @match        https://sellercentral.amazon.in/*
// @match        https://sellercentral.amazon.com.au/*
// @grant        GM_xmlhttpRequest
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// @run-at       document-end
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // Create and append tooltip element
    const tooltip = document.createElement('div');
    tooltip.id = 'priceTooltip';
    GM_addStyle(`
        #priceTooltip {
            position: fixed;
            background-color: #fff;
            border: 1px solid #ddd;
            padding: 5px 10px;
            border-radius: 4px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
            display: none;
            z-index: 10000;
            font-family: Arial, sans-serif;
            font-size: 14px;
        }
    `);
    document.body.appendChild(tooltip);

    let tooltipTimeout;
    const priceCache = {};

    function extractPrice(html) {
        const parser = new DOMParser();
        const doc = parser.parseFromString(html, 'text/html');

        const priceSelectors = [
            '.a-price .a-offscreen',
            '#priceblock_ourprice',
            '#priceblock_dealprice',
            '.a-price-whole',
            '.a-offscreen'
        ];

        for (let selector of priceSelectors) {
            const priceElement = doc.querySelector(selector);
            if (priceElement) {
                return priceElement.textContent.trim();
            }
        }

        return null;
    }

    async function loadProductPage(url) {
        if (priceCache[url]) {
            return Promise.resolve(priceCache[url]);
        }

        return new Promise((resolve, reject) => {
            GM_xmlhttpRequest({
                method: 'GET',
                url: url,
                onload: function(response) {
                    if (response.status === 200) {
                        const price = extractPrice(response.responseText);
                        priceCache[url] = price;
                        resolve(price);
                    } else {
                        reject('Failed to load page');
                    }
                },
                onerror: function(error) {
                    reject(error);
                }
            });
        });
    }

    function debounce(func, wait) {
        let timeout;
        return function(...args) {
            clearTimeout(timeout);
            timeout = setTimeout(() => func.apply(this, args), wait);
        };
    }

    const handleMouseover = debounce(function(e) {
        const link = e.target.closest('a[href*="/dp/"], a[href*="/product/"]');
        if (link) {
            const url = link.href;
            clearTimeout(tooltipTimeout);
            tooltipTimeout = setTimeout(() => {
                tooltip.textContent = 'Loading price...';
                tooltip.style.display = 'block';
                updateTooltipPosition(e);

                loadProductPage(url)
                    .then(price => {
                        if (price) {
                            tooltip.textContent = `Price: ${price}`;
                        } else {
                            tooltip.textContent = 'Price not found';
                        }
                    })
                    .catch(error => {
                        tooltip.textContent = 'Error loading price';
                        console.error('Error loading price:', error);
                    });
            }, 300); // Reduced delay for faster response
        }
    }, 200); // Debounce mouseover to limit request frequency

    document.addEventListener('mouseover', handleMouseover);

    document.addEventListener('mouseout', function(e) {
        if (e.target.closest('a[href*="/dp/"], a[href*="/product/"]')) {
            clearTimeout(tooltipTimeout);
            tooltipTimeout = setTimeout(() => {
                tooltip.style.display = 'none';
            }, 100);
        }
    });

    document.addEventListener('mousemove', updateTooltipPosition);

    function updateTooltipPosition(e) {
        const x = e.clientX + 10;
        const y = e.clientY + 10;
        tooltip.style.left = x + 'px';
        tooltip.style.top = y + 'px';
    }
})();