// ==UserScript==
// @name         京东图书定价查询助手（手动防封版）
// @namespace    http://tampermonkey.net/
// @version      2.9-Manual
// @description  手动触发查询，防封
// @author       M
// @match        *://t.jd.com/*
// @match        *://guanzhu.jd.com/*
// @match        *://item.jd.com/*
// @grant        GM_xmlhttpRequest
// @connect      item.m.jd.com
// ==/UserScript==

(function() {
    'use strict';

    const CONFIG = {
        FOLLOW: { card: '.item-inner', price: '.p-price' },
        ITEM: { anchor: '.product-price-panel' }
    };

    let lastItemSku = null;

    function getPageType() {
        if (window.location.host.includes('item.jd.com')) return 'ITEM';
        return 'FOLLOW';
    }

    const currentPage = getPageType();
    console.log(`🚀 京东图书定价查询助手（手动防封版） 启动！请点击 [🔍查定价] 按钮获取价格。`);

    function fetchPrice(sku, btn, targetContainer) {
        btn.innerText = "⏳查询中...";
        btn.disabled = true;
        btn.style.cursor = "not-allowed";
        btn.style.background = "#999";

        GM_xmlhttpRequest({
            method: "GET",
            url: `https://item.m.jd.com/product/${sku}.html`,
            timeout: 6000,
            onload: function(response) {
                if (response.finalUrl && response.finalUrl.includes('risk_handler')) {
                    btn.innerText = "🚫被拦截(稍后再试)";
                    btn.style.background = "#666";
                    return;
                }

                try {
                    const html = response.responseText;
                    let marketPrice = null;
                    let currentPrice = null;

                    let mMatch = html.match(/"linePrice"\s*:\s*\{[^}]*?"price"\s*:\s*["'](\d+\.\d{1,2})["']/i);
                    if (mMatch) marketPrice = parseFloat(mMatch[1]);

                    let pMatch = html.match(/"jdPrice"\s*:\s*["'](\d+\.\d{1,2})["']/i);
                    if (pMatch) currentPrice = parseFloat(pMatch[1]);

                    if (marketPrice) {
                        const discount = (currentPrice && marketPrice > 0) ? ((currentPrice / marketPrice) * 10).toFixed(2) : null;
                        injectDisplay(targetContainer, marketPrice, discount, sku, btn);
                    } else {
                        btn.innerText = "⚠️无定价(通常为套装)";
                        btn.style.background = "#f0ad4e";
                    }
                } catch (e) {
                    btn.innerText = "❌解析失败";
                    btn.style.background = "#d9534f";
                }
            },
            onerror: function() {
                btn.innerText = "❌网络超时(重试)";
                btn.disabled = false;
                btn.style.cursor = "pointer";
                btn.style.background = "#e4393c";
            }
        });
    }

    function injectDisplay(container, mPrice, discount, sku, btn) {
        if (document.querySelector(`.gemini-tag-${sku}`)) return;

        const isDetailPage = (currentPage === 'ITEM');
        const wrap = document.createElement('span');
        wrap.className = `gemini-tag-${sku}`;
        wrap.style.cssText = isDetailPage
            ? "display:inline-block; margin-left:10px; color:#999; font-size:13px;"
            : "display:inline-block; margin-left:6px; color:#999; font-size:12px;";

        wrap.innerHTML = `定价:￥${mPrice}${discount ? ` <span style="color:red;">[${discount}折]</span>` : ''}`;

        if (btn && btn.parentNode) {
            btn.parentNode.replaceChild(wrap, btn);
        } else {
            if (isDetailPage) {
                const anchor = document.querySelector('.product-price-gray-line-through') || document.querySelector('.product-price--gray-line-through') || container;
                if(anchor && anchor.parentNode) anchor.parentNode.appendChild(wrap);
            } else {
                container.appendChild(wrap);
            }
        }
    }

    function createButton(sku, container) {
        const btn = document.createElement('button');
        btn.className = `gemini-btn-${sku}`;
        btn.innerText = "🔍查定价";
        btn.style.cssText = "display:inline-block; margin-left:8px; padding:2px 8px; font-size:12px; color:#fff; background:#e4393c; border:none; border-radius:12px; cursor:pointer; outline:none; transition:all 0.2s;";

        btn.onclick = function(e) {
            e.preventDefault();
            e.stopPropagation();
            fetchPrice(sku, btn, container);
        };
        return btn;
    }

    function scan() {
        if (currentPage === 'ITEM') {
            const skuMatch = window.location.href.match(/\/(\d+)\.html/);
            if (skuMatch) {
                const sku = skuMatch[1];
                if (lastItemSku && lastItemSku !== sku) {
                    document.querySelectorAll('[class^="gemini-tag-"], [class^="gemini-btn-"]').forEach(el => el.remove());
                }
                lastItemSku = sku;

                if (!document.querySelector(`.gemini-tag-${sku}`) && !document.querySelector(`.gemini-btn-${sku}`)) {
                    const anchor = document.querySelector(CONFIG.ITEM.anchor);
                    if (anchor) {
                        const btn = createButton(sku, anchor);
                        // 兼容新老灰色类名
                        const grayPrice = document.querySelector('.product-price-gray-line-through') || document.querySelector('.product-price--gray-line-through');
                        if (grayPrice && grayPrice.parentNode) {
                            grayPrice.parentNode.insertBefore(btn, grayPrice.nextSibling);
                        } else if (anchor.parentNode) {
                            // 🌟 越狱修复：直接插入到父容器的末尾，模仿原 V2.9 暴力绕过 overflow 限制
                            anchor.parentNode.appendChild(btn);
                        }
                    }
                }
            }
        } else {
            document.querySelectorAll(CONFIG.FOLLOW.card).forEach(card => {
                const link = card.querySelector('a[href*="jd.com"]');
                const priceArea = card.querySelector(CONFIG.FOLLOW.price);

                if (link && priceArea) {
                    const match = link.href.match(/\/(\d{6,15})/);
                    if (match) {
                        const sku = match[1];
                        if (!card.querySelector(`.gemini-btn-${sku}`) && !card.querySelector(`.gemini-tag-${sku}`)) {
                            const btn = createButton(sku, priceArea);
                            priceArea.appendChild(btn);
                        }
                    }
                }
            });
        }
    }

    setInterval(scan, 1500);
})();