// ==UserScript==
// @name         学习通绕过解锁粘贴限制
// @namespace    https://scriptcat.org/zh-CN/script-show-page/4835
// @version      1.2.1
// @description  解锁学习通 代码编辑区、UE编辑器、讨论区 的粘贴限制
// @author       Muyue
// @match        *://*.chaoxing.com/*
// @match        *://mooc1-*.chaoxing.com/*
// @connect      sso.chaoxing.com
// @grant        none
// @run-at       document-start
// @tag          学习通
// ==/UserScript==

(function() {
    'use strict';

    const TAG = '[Unified-Paste]';
    const log = (...a) => console.log(TAG, ...a);

    function showNotice(msg) {
        if (window.$ && $.toast) {
            $.toast({ type: 'notice', content: msg });
        } else {
            console.log(TAG, msg);
        }
    }
    function initDiscussionLogic() {
        const checkObj = setInterval(() => {
            if (window.obj) {
                if (window.obj.circle) {
                    window.obj.circle.prohibitReplyPasting = 0;
                    log('Discussion config bypassed (prohibitReplyPasting=0)');
                }
                window.obj.isManager = 1;
                clearInterval(checkObj);
            }
        }, 500);
        setTimeout(() => clearInterval(checkObj), 10000);
        window.addEventListener('paste', function(e) {
            const target = e.target;
            if (target.tagName === 'TEXTAREA' || target.contentEditable === 'true') {
                e.stopImmediatePropagation();
            }
        }, true);
    }
    function initUEditorLogic() {
        const timer = setInterval(() => {
            if (!window.UE || !UE.instants) return;
            const editor = UE.instants[Object.keys(UE.instants)[0]];
            if (!editor || !editor.iframe) return;
            const doc = editor.iframe.contentDocument;
            if (!doc || !doc.body) return;

            clearInterval(timer);
            log('UEditor detected, hijacking paste...');

            doc.addEventListener('paste', function (e) {
                const cd = e.clipboardData || window.clipboardData;
                if (!cd) return;

                let hasFile = false;
                let hasHtml = !!cd.getData('text/html');

                if (cd.items) {
                    for (const item of cd.items) {
                        if (item.kind === 'file') { hasFile = true; break; }
                    }
                }
                if (hasFile || hasHtml) {
                    e.preventDefault();
                    e.stopImmediatePropagation();
                    const text = cd.getData('text/plain');
                    if (text) {
                        editor.execCommand('insertHtml', text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\n/g, '<br/>'), true);
                        showNotice("已绕过粘贴限制，图片等附件请通过上方菜单以附件形式上传 By.Muyue -imuyue.com");
                    }
                }
            }, true);
        }, 1000);
    }
    function initCodeEditorLogic() {
        const checkCodeEditor = setInterval(() => {
            var codeEditors = window.codeEditors || {};
            if (Object.keys(codeEditors).length === 0) return;

            clearInterval(checkCodeEditor);
            log('CodeMirror detected, unlocking paste...');

            for (let editorId in codeEditors) {
                let editor = codeEditors[editorId];
                if (editor && !editor._isUnlocked) {
                    editor.on('beforeChange', function(cm, change) {
                        if (change.origin === 'paste') {
                            change.cancel();
                            const pastedText = (event.clipboardData || window.clipboardData).getData('text');
                            const cursor = cm.getCursor();
                            cm.operation(function() {
                                cm.replaceRange(pastedText, cursor);
                            });
                            showNotice("已绕过代码粘贴限制 By.Muyue -imuyue.com");
                        }
                    });
                    editor._isUnlocked = true;
                }
            }
        }, 1000);
    }

    initDiscussionLogic();
    window.addEventListener('load', () => {
        initUEditorLogic();
        initCodeEditorLogic();
    });

})();