// ==UserScript==
// @name         ASIN链接生成器
// @namespace    ASIN Link Generator
// @version      1.0
// @description  生成ASIN对应的链接并跳转到适用的Amazon站点
// @match        https://www.amazon.*
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // 根据当前访问的Amazon站点获取相应的链接前缀
    function getAmazonURLPrefix() {
        const hostname = window.location.hostname;
        if (hostname.includes('amazon.com')) {
            return 'https://www.amazon.com/dp/';
        } else if (hostname.includes('amazon.ca')) {
            return 'https://www.amazon.ca/dp/';
        } else if (hostname.includes('amazon.co.uk')) {
            return 'https://www.amazon.co.uk/dp/';
        } else if (hostname.includes('amazon.de')) {
            return 'https://www.amazon.de/dp/';
        }
        return null;
    }

    // 创建一个按钮元素并添加到页面上
    function createButton(text, clickHandler) {
        const button = document.createElement('button');
        button.style.position = 'fixed';
        button.style.left = '20px';
        button.style.top = text === '打开ASIN' ? '50%' : '55%';
        button.style.transform = 'translateY(-50%)';
        button.textContent = text;
        button.addEventListener('click', clickHandler);
        document.body.appendChild(button);
    }

    // 点击“打开ASIN”按钮的处理函数
    function openASINHandler() {
        const asin = prompt('请输入ASIN');
        if (asin) {
            const urlPrefix = getAmazonURLPrefix();
            if (urlPrefix) {
                const url = urlPrefix + asin;
                window.location.href = url;
            } else {
                alert('无法识别的Amazon站点');
            }
        }
    }

    // 点击“打开批量ASIN”按钮的处理函数
    function openBatchASINHandler() {
        const asins = prompt('请输入批量ASIN，以换行符分隔');
        if (asins) {
            const urlPrefix = getAmazonURLPrefix();
            if (urlPrefix) {
                const asinArray = asins.split('\n');
                const asinQuery = asinArray.join('%7C');
                const url = urlPrefix + asinQuery;
                window.location.href = url;
            } else {
                alert('无法识别的Amazon站点');
            }
        }
    }

    // 创建并添加按钮到页面上
    createButton('打开ASIN', openASINHandler);
    createButton('打开批量ASIN', openBatchASINHandler);
})();