// ==UserScript==
// @name         European Price Checker for Amazon (fr, de, es, it)
// @namespace    http://tampermonkey.net/
// @version      2.3
// @description  Compare product prices on Amazon.fr, Amazon.de, Amazon.es, and Amazon.it to find the best deal. Integrates CamelCamelCamel for price history charts.
// @author       bNj
// @icon         https://i.ibb.co/qrjrcVy/amz-price-checker.png
// @match        https://www.amazon.fr/*
// @match        https://www.amazon.de/*
// @match        https://www.amazon.es/*
// @match        https://www.amazon.it/*
// @grant        GM_xmlhttpRequest
// @connect      amazon.fr
// @connect      amazon.es
// @connect      amazon.it
// @connect      amazon.de
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // CSS Styles
    const styles = `
    #amazonPriceComparisonContainer { margin-top: 20px; padding: 10px; background-color: #f9f9f9; border: 1px solid #ccc; border-radius: 8px; position: relative; font-size: 11px; }
    .comparison-row { cursor: pointer; display: flex; justify-content: space-between; padding: 5px 0; border-bottom: 1px solid #ccc; }
    .comparison-row:hover { background-color: #f1f1f1; }
    .comparison-row.header-row { border-bottom: 2px solid #000; font-weight: bold; pointer-events: none; }
    #loadingMessage { text-align: center; font-weight: bold; font-size: 14px; display: flex; flex-direction: column; align-items: center; background-clip: text; -webkit-background-clip: text; color: transparent; background-image: linear-gradient(270deg, black 0%, black 20%, #FF9900 50%, black 80%, black 100%); background-size: 200% 100%; animation: loadingAnimation 2s linear infinite; }
    @keyframes loadingAnimation { 0% { background-position: 100% 50%; } 100% { background-position: 0% 50%; } }
    .active-button { background-color: #ff9900 !important; }
    .price-difference-positive { color: green; }
    .price-difference-negative { color: red; }
    `;

    // Inject CSS Styles
    const styleSheet = document.createElement('style');
    styleSheet.type = 'text/css';
    styleSheet.innerText = styles;
    document.head.appendChild(styleSheet);

    const ASIN_REGEX = /\/([A-Z0-9]{10})(?:[/?]|$)/;
    const asinMatch = window.location.href.match(ASIN_REGEX);
    if (!asinMatch) return;
    const asin = asinMatch[1];

    const PARTNER_IDS = {
        fr: 'geeksince1983-21',
        es: 'geeksince1901-21',
        it: 'geeksince1903-21',
        de: 'geeksince190d-21'
    };

    const amazonSites = [
        { name: 'Amazon.fr', country: 'fr', flag: 'https://flagcdn.com/w20/fr.png' },
        { name: 'Amazon.es', country: 'es', flag: 'https://flagcdn.com/w20/es.png' },
        { name: 'Amazon.it', country: 'it', flag: 'https://flagcdn.com/w20/it.png' },
        { name: 'Amazon.de', country: 'de', flag: 'https://flagcdn.com/w20/de.png' }
    ];

    let selectedTimePeriod = 'all';
    const basePrice = getPriceFromDocument(document);
    if (basePrice === null) return;

    createLoadingContainer();

    let requestCount = 0;
    const priceResults = [];

    amazonSites.forEach(site => {
        const url = `https://www.amazon.${site.country}/dp/${asin}?tag=${PARTNER_IDS[site.country]}`;
        GM_xmlhttpRequest({
            method: 'GET',
            url: url,
            headers: { 'User-Agent': 'Mozilla/5.0', 'Accept-Language': 'en-US,en;q=0.5' },
            onload: response => handleResponse(site, response),
            onerror: () => handleResponse(site, null)
        });
    });

    function handleResponse(site, response) {
        requestCount++;
        if (response && response.status === 200) {
            const parser = new DOMParser();
            const doc = parser.parseFromString(response.responseText, 'text/html');
            const price = getPriceFromDocument(doc);
            const deliveryPrice = getDeliveryPriceFromDocument(doc);
            if (price !== null) {
                priceResults.push({ ...site, price, deliveryPrice });
            }
        }
        if (requestCount === amazonSites.length) {
            displayAllResults();
        }
    }

    function createLoadingContainer() {
        const priceElement = document.querySelector('.priceToPay, #priceblock_ourprice, #priceblock_dealprice, #priceblock_saleprice');
        if (priceElement && priceElement.parentNode) {
            const container = document.createElement('div');
            container.id = 'amazonPriceComparisonContainer';
            container.innerHTML = `
                <div id="loadingMessage">
                    <img src="https://i.ibb.co/qrjrcVy/amz-price-checker.png" alt="Loading logo" style="width: 50px; height: 50px; margin-bottom: 10px;">
                    Checking other Amazon sites...
                </div>`;
            priceElement.parentNode.appendChild(container);
        }
    }

    function getPriceFromDocument(doc) {
        const priceElement = doc.querySelector('.priceToPay, #priceblock_ourprice, #priceblock_dealprice, #priceblock_saleprice');
        if (!priceElement) return null;
        const priceText = priceElement.textContent;
        return parsePrice(priceText);
    }

    function parsePrice(priceText) {
        if (!priceText) return null;
        const cleanedText = priceText.replace(/[^0-9,\.]/g, '').replace(',', '.');
        const price = parseFloat(cleanedText);
        return isNaN(price) ? null : price;
    }

    function getDeliveryPriceFromDocument(doc) {
        const deliveryMatch = doc.body.innerHTML.match(/data-csa-c-delivery-price="[^"]*?(\d+[.,]\d{2})/);
        if (deliveryMatch) {
            const priceStr = deliveryMatch[1].replace(',', '.');
            const price = parseFloat(priceStr);
            return isNaN(price) ? 0 : price;
        }
        return 0;
    }

    function displayAllResults() {
        const priceContainer = document.querySelector('#amazonPriceComparisonContainer');
        if (!priceContainer) return;
        priceContainer.innerHTML = '';

        const headerRow = document.createElement('div');
        headerRow.className = 'comparison-row header-row';
        ['Site', 'Price', 'Delivery', 'Total', 'Difference'].forEach(header => {
            const headerCell = createCell(header, true);
            headerRow.appendChild(headerCell);
        });
        priceContainer.appendChild(headerRow);

        priceResults.sort((a, b) => (a.price + a.deliveryPrice) - (b.price + b.deliveryPrice));

        priceResults.forEach(result => {
            const row = document.createElement('div');
            row.className = 'comparison-row';
            row.onclick = () => window.open(`https://www.amazon.${result.country}/dp/${asin}?tag=${PARTNER_IDS[result.country]}`, '_blank');

            const totalPrice = result.price + (result.deliveryPrice || 0);
            const difference = totalPrice - basePrice;
            const differencePercentage = ((difference / basePrice) * 100).toFixed(2);
            const differenceClass = difference < 0 ? 'price-difference-positive' : difference > 0 ? 'price-difference-negative' : '';

            row.append(
                createCell(`<img src="${result.flag}" alt="${result.name} flag" style="vertical-align: middle; margin-right: 5px;"> ${result.name}`),
                createCell(`€${result.price.toFixed(2)}`),
                createCell(result.deliveryPrice ? `<img src="https://img.icons8.com/?size=100&id=12248&format=png&color=000000" width="20"/> €${result.deliveryPrice.toFixed(2)}` : '-'),
                createCell(`€${totalPrice.toFixed(2)}`),
                createCell(difference !== 0 ? `<span class="${differenceClass}">${difference >= 0 ? '+' : ''}€${difference.toFixed(2)} (${differencePercentage}%)</span>` : '-')
            );

            priceContainer.appendChild(row);
        });

        addControls();
        addCamelCamelCamelChart();
    }

    function createCell(content, isHeader = false) {
        const cell = document.createElement('div');
        cell.style.flex = '1';
        cell.style.textAlign = 'center';
        cell.innerHTML = content;
        if (isHeader) {
            cell.style.fontWeight = 'bold';
        }
        return cell;
    }

    function addControls() {
        const priceContainer = document.querySelector('#amazonPriceComparisonContainer');
        if (!priceContainer) return;

        const controlsContainer = document.createElement('div');
        controlsContainer.style.cssText = 'text-align: center; margin: 10px; display: flex; justify-content: center; align-items: center; gap: 10px;';

        const timePeriods = [
            { id: 'btn1Month', label: '1 Month', value: '1m' },
            { id: 'btn3Months', label: '3 Months', value: '3m' },
            { id: 'btn6Months', label: '6 Months', value: '6m' },
            { id: 'btn1Year', label: '1 Year', value: '1y' },
            { id: 'btnAll', label: 'All', value: 'all' }
        ];

        timePeriods.forEach(period => {
            const button = document.createElement('button');
            button.id = period.id;
            button.textContent = period.label;
            button.className = period.value === selectedTimePeriod ? 'active-button' : '';
            button.style.cssText = `
                padding: 5px 10px;
                border: 1px solid #ccc;
                border-radius: 5px;
                background-color: ${period.value === selectedTimePeriod ? '#ff9900' : '#f9f9f9'};
                cursor: pointer;
            `;

            button.addEventListener('click', () => {
                selectedTimePeriod = period.value;
                document.querySelectorAll('#amazonPriceComparisonContainer button').forEach(btn => {
                    btn.classList.remove('active-button');
                    btn.style.backgroundColor = '#f9f9f9';
                });
                button.classList.add('active-button');
                button.style.backgroundColor = '#ff9900';
                updateChartUrl();
            });

            controlsContainer.appendChild(button);
        });

        const checkboxes = [
            { id: 'checkboxAmazon', label: 'Amazon', filename: 'amazon', disabled: true, checked: true },
            { id: 'checkboxNew', label: 'New', filename: 'new', checked: false },
            { id: 'checkboxUsed', label: 'Used', filename: 'used', checked: false }
        ];

        checkboxes.forEach(checkbox => {
            const container = document.createElement('div');
            container.style.display = 'flex';
            container.style.alignItems = 'center';
            container.style.flexDirection = 'column';

            const checkboxElement = document.createElement('input');
            checkboxElement.type = 'checkbox';
            checkboxElement.id = checkbox.id;
            checkboxElement.checked = checkbox.checked;
            checkboxElement.style.marginBottom = '5px';
            if (checkbox.disabled) checkboxElement.disabled = true;

            checkboxElement.addEventListener('change', updateChartUrl);

            const labelElement = document.createElement('label');
            labelElement.htmlFor = checkbox.id;
            labelElement.textContent = checkbox.label;
            labelElement.style.fontWeight = 'normal';

            container.append(checkboxElement, labelElement);
            controlsContainer.appendChild(container);
        });

        priceContainer.appendChild(controlsContainer);
    }

    function addCamelCamelCamelChart() {
        const priceContainer = document.querySelector('#amazonPriceComparisonContainer');
        if (!priceContainer) return;

        const chartContainer = document.createElement('div');
        chartContainer.style.marginTop = '20px';
        chartContainer.style.textAlign = 'center';

        const countryCode = getCurrentCountryCode();
        const chartUrl = getCamelChartUrl(countryCode, asin, selectedTimePeriod);
        const camelUrl = `https://${countryCode}.camelcamelcamel.com/product/${asin}`;
        chartContainer.innerHTML = `<a href="${camelUrl}" target="_blank"><img src="${chartUrl}" alt="Price history for ${asin}" style="max-width: 100%; height: auto; border: 1px solid #ccc; border-radius: 8px;"></a>`;

        priceContainer.appendChild(chartContainer);

        const footer = document.createElement('div');
        footer.style.cssText = 'text-align: right; font-size: 0.7em; color: #666; margin-top: 10px;';
        footer.innerHTML = `<img src="https://i.ibb.co/qrjrcVy/amz-price-checker.png" alt="Logo" style="width: 20px; height: 20px; vertical-align: middle; margin-right: 5px;"> European Price Checker for Amazon by bNj v${GM_info.script.version}`;
        priceContainer.appendChild(footer);
    }

    function getCurrentCountryCode() {
        const hostname = window.location.hostname;
        if (hostname.includes('amazon.de')) return 'de';
        if (hostname.includes('amazon.es')) return 'es';
        if (hostname.includes('amazon.it')) return 'it';
        return 'fr';
    }

    function getCamelChartUrl(countryCode, asin, timePeriod) {
        const selectedFilenames = getSelectedFilenames();
        return `https://charts.camelcamelcamel.com/${countryCode}/${asin}/${selectedFilenames}.png?force=1&zero=0&w=600&h=300&desired=false&legend=1&ilt=1&tp=${timePeriod}&fo=0&lang=en`;
    }

    function getSelectedFilenames() {
        const checkboxes = [
            { id: 'checkboxAmazon', filename: 'amazon' },
            { id: 'checkboxNew', filename: 'new' },
            { id: 'checkboxUsed', filename: 'used' }
        ];

        return Array.from(document.querySelectorAll('input[type="checkbox"]:checked'))
            .map(checkbox => checkboxes.find(cb => cb.id === checkbox.id)?.filename)
            .filter(Boolean)
            .join('-');
    }

    function updateChartUrl() {
        const countryCode = getCurrentCountryCode();
        const chartUrl = getCamelChartUrl(countryCode, asin, selectedTimePeriod);
        const camelUrl = `https://${countryCode}.camelcamelcamel.com/product/${asin}`;
        const chartImage = document.querySelector('#amazonPriceComparisonContainer img[alt^="Price history"]');
        if (chartImage) {
            chartImage.src = chartUrl;
            chartImage.parentElement.href = camelUrl;
        }
    }
})();