// ==UserScript==
// @name         yudao_doc_unlock
// @namespace    https://doc.iocoder.cn/
// @version      2.1.0
// @description  恢复受支持页面的完整正文显示
// @author       mensorigos
// @match        *://doc.iocoder.cn/*
// @match        *://www.iocoder.cn/*
// @grant        none
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function () {
    'use strict';

    /* 仅调整本地呈现：不修改正文，不读写站点凭证，不发起额外请求 */

    var PAGE_STATES = ['pending', 'guest', 'error'];
    var LAYER_TAGS = ['doc-access-layer', 'doc-access-pending', 'doc-access-status'];
    var LAYER_SELECTOR = LAYER_TAGS.join(',') + ',#locker';

    var STYLE_ID = 'yd-style';
    var STYLE_TEXT = [
        'html[data-doc-access] body .content-wrapper,',
        'html[data-doc-access] body .content-wrapper .theme-vdoing-content,',
        'html[data-doc-access] body .content-wrapper .content__default {',
        '  visibility: visible !important;',
        '}',
        'doc-access-layer, doc-access-pending, doc-access-status,',
        '#doc-access-error { display: none !important; }',
        '#locker { display: none !important; }',
        'article.lock { overflow: visible !important; }',
        '#post-body { height: auto !important; max-height: none !important; }'
    ].join('\n');

    function applyStyle() {
        var host = document.head || document.documentElement;
        if (!host) return;
        var old = document.getElementById(STYLE_ID);
        if (old && old.parentNode === host) return;
        if (old && old.parentNode) old.parentNode.removeChild(old);
        var style = document.createElement('style');
        style.id = STYLE_ID;
        style.textContent = STYLE_TEXT;
        host.appendChild(style);
    }

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

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

    function dropLocker() {
        var node = document.getElementById('locker');
        if (node && node.parentNode) node.parentNode.removeChild(node);
    }

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

    function dropLayer(node) {
        if (node && node.parentNode) node.parentNode.removeChild(node);
        restoreScroll();
    }

    var rawAppendChild = Node.prototype.appendChild;
    Node.prototype.appendChild = function (node) {
        if (isLayer(node)) {
            setTimeout(restoreScroll, 0);
            return node;
        }
        return rawAppendChild.call(this, node);
    };

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

    function sweep() {
        var root = document.body || document.documentElement;
        if (!root || !root.querySelectorAll) return;
        var list = root.querySelectorAll(LAYER_SELECTOR);
        for (var i = list.length - 1; i >= 0; i--) dropLayer(list[i]);
    }

    function boot() {
        applyStyle();
        syncState();
        dropLocker();
        sweep();
    }

    if (document.documentElement) {
        new MutationObserver(function (records) {
            applyStyle();
            for (var i = 0; i < records.length; i++) {
                var r = records[i];
                if (r.type === 'attributes') {
                    syncState();
                    continue;
                }
                for (var j = 0; j < r.addedNodes.length; j++) {
                    if (isLayer(r.addedNodes[j])) dropLayer(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();
    }

    window.addEventListener('load', function () {
        setTimeout(boot, 300);
    });
})();