// ==UserScript==
// @name         yudao_doc_unlock
// @namespace    https://doc.iocoder.cn/
// @version      2.0.0
// @description  解除 doc.iocoder.cn 文档的 VIP 遮罩与会员弹窗（适配 2026-10 新版 doc-access 机制）
// @author       mensorigos
// @match        *://doc.iocoder.cn/*
// @grant        none
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    var BLOCKED_STATES = ['guest', 'pending', 'error'];
    var OVERLAY_TAGS = ['doc-access-layer', 'doc-access-pending', 'doc-access-status'];

    /* ── A. 样式覆盖 ─────────────────────────────────────────────── */

    var CSS =
        /* 选择器权重 (0,1,2) 高于站点的 (0,1,1)，样式表先后顺序不影响结果 */
        'html[data-doc-access] body .content-wrapper,\n' +
        'html[data-doc-access] body .content-wrapper .theme-vdoing-content,\n' +
        'html[data-doc-access] body .content-wrapper .content__default {\n' +
        '  visibility: visible !important;\n' +
        '}\n' +
        /* 兜底：即便元素被插进来也不参与布局 */
        'doc-access-layer, doc-access-pending, doc-access-status,\n' +
        '#doc-access-error { display: none !important; }\n';

    function injectCss() {
        var host = document.head || document.documentElement;
        if (!host) return;
        var old = document.getElementById('yd-unlock-style');
        if (old && old.parentNode === host) return;
        if (old && old.parentNode) old.parentNode.removeChild(old);
        var style = document.createElement('style');
        style.id = 'yd-unlock-style';
        style.textContent = CSS;
        host.appendChild(style);
    }

    /* ── B. 状态位归零 ───────────────────────────────────────────── */

    function normalizeAccess() {
        var root = document.documentElement;
        if (!root) return;
        var state = root.getAttribute('data-doc-access');
        if (state && BLOCKED_STATES.indexOf(state) !== -1) {
            root.setAttribute('data-doc-access', 'public');
        }
    }

    /* ── C. 遮罩元素拦截 ─────────────────────────────────────────── */

    function isOverlay(node) {
        return !!node && node.nodeType === 1 &&
            typeof node.tagName === 'string' &&
            OVERLAY_TAGS.indexOf(node.tagName.toLowerCase()) !== -1;
    }

    function releaseScroll() {
        if (document.body && document.body.style.overflow === 'hidden') {
            document.body.style.overflow = '';
        }
    }

    function dropOverlay(node) {
        if (node && node.parentNode) node.parentNode.removeChild(node);
        releaseScroll();
    }

    var rawAppendChild = Node.prototype.appendChild;
    Node.prototype.appendChild = function (node) {
        if (isOverlay(node)) {
            /* 站点在 append 之后才会锁 body 滚动，延后一个宏任务再解除 */
            setTimeout(releaseScroll, 0);
            return node;
        }
        return rawAppendChild.call(this, node);
    };

    var rawInsertBefore = Node.prototype.insertBefore;
    Node.prototype.insertBefore = function (node, ref) {
        if (isOverlay(node)) {
            setTimeout(releaseScroll, 0);
            return node;
        }
        return rawInsertBefore.call(this, node, ref);
    };

    /* 兜底：脚本注入前已存在的节点 */
    function sweepAll() {
        var root = document.body || document.documentElement;
        if (!root || !root.querySelectorAll) return;
        var list = root.querySelectorAll(OVERLAY_TAGS.join(','));
        for (var i = list.length - 1; i >= 0; i--) dropOverlay(list[i]);
    }

    /* ── D. 监听器 ───────────────────────────────────────────────── */

    function boot() {
        injectCss();
        normalizeAccess();
        sweepAll();
    }

    if (document.documentElement) {
        new MutationObserver(function (records) {
            /* <head> 出现后把样式表迁进去；被站点清掉时自动补回 */
            injectCss();
            for (var i = 0; i < records.length; i++) {
                var r = records[i];
                if (r.type === 'attributes') {
                    normalizeAccess();
                    continue;
                }
                /* 只判定新增节点本身，避免在热路径上做整棵子树查询 */
                for (var j = 0; j < r.addedNodes.length; j++) {
                    if (isOverlay(r.addedNodes[j])) dropOverlay(r.addedNodes[j]);
                }
            }
        }).observe(document.documentElement, {
            childList: true,
            subtree: true,
            attributes: true,
            attributeFilter: ['data-doc-access']
        });
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', boot, { once: true });
    } else {
        boot();
    }

    /* 路由切换会重新触发校验，首屏后再补一次清理 */
    window.addEventListener('load', function () {
        setTimeout(boot, 300);
    });
})();