// ==UserScript==
// @name         力扣题目转Markdown
// @name:en      LeetCode Promlem to Markdown
// @namespace    https://gabrielxd.top/
// @version      1.2.0
// @description  转换力扣题目为Markdown格式并复制到剪贴板
// @description:en  Convert the LeetCode problems to markdown and copy it to the clipboard.
// @author       GabrielxD
// @match        *://leetcode.cn/problems/*
// @icon         data:image/png;base64,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
// @require      https://unpkg.com/turndown/dist/turndown.js
// @require      https://cdn.jsdelivr.net/npm/msg-alert@1.0.0-beta.2/dist/msg-alert.min.js
// @grant        GM_setClipboard
// @grant        GM_addStyle
// @grant        GM_registerMenuCommand
// @license 	 MIT
// @downloadURL https://update.greasyfork.icu/scripts/448601/%E5%8A%9B%E6%89%A3%E9%A2%98%E7%9B%AE%E8%BD%ACMarkdown.user.js
// @updateURL https://update.greasyfork.icu/scripts/448601/%E5%8A%9B%E6%89%A3%E9%A2%98%E7%9B%AE%E8%BD%ACMarkdown.meta.js
// ==/UserScript==

// 添加复制按钮样式
GM_addStyle(`
.copy-btns { display: inline-block; }

.copy-btns > button {
    margin-left: 10px;
    vertical-align: middle;
    font-size: 12px;
    background: transparent;
    border: none;
    border-radius: 3px;
    box-shadow: inset 0px 0px 0px 1px rgba(var(--dsw-green-standard-rgb), 1);
    color: rgba(var(--dsw-green-standard-rgb), 1);
    cursor: pointer;
    outline: none;
}`);

const turndownService = new TurndownService({
    emDelimiter: '*',
    bulletListMarker: '-'
});
turndownService.addRule('strikethrough', {
    filter: ['pre'],
    replacement: (content, node) => '\n```txt\n' + node.innerText.trim() + '\n```\n'
});
turndownService.addRule('strikethrough', {
    filter: ['sup'],
    replacement: content => '^' + content
});

// 接收HTML字符串转成Markdown格式
const htmlToMd = htmlStr => {
    console.log('转换开始...');
    return turndownService.turndown(htmlStr.replace(/<p>&nbsp;<\/p>/g, '<br>'));
}
const getDescMd = () => htmlToMd(descEle.innerHTML);
const getCodeMd = () => document.querySelector('input[name=lang]').value + '\n' +
    document.querySelector('input[name=code]').value + '\n```\n';
const getTitle = () => titleEle.firstElementChild.innerText;

// 查询到的节点缓存在变量中
let titleEle, descEle;
// 拼接解题模板用到的字符串
const afterDesc = '\n\n  \n\n## 解题\n\n### 方法一：\n\n#### 思路\n\n\n\n#### 代码\n\n```';
// 复制标题
const copyTitleBtn = document.createElement('button');
copyTitleBtn.innerText = '复制标题';
copyTitleBtn.addEventListener('click', copyTitleHandler);
GM_registerMenuCommand("复制标题", copyTitleHandler);
// 复制题目
const copyDescBtn = document.createElement('button');
copyDescBtn.innerText = '复制题目';
copyDescBtn.addEventListener('click', copyDescHandler);
GM_registerMenuCommand("复制题目", copyDescHandler);
// 生成解题模板并复制
const copySolnTmplBtn = document.createElement('button');
copySolnTmplBtn.innerText = '解题模板';
copySolnTmplBtn.addEventListener('click', copySolnTmplHandler);
GM_registerMenuCommand("解题模板", copySolnTmplHandler);
// 放入功能按钮
const copyBtnsEle = document.createElement('div');
copyBtnsEle.className = 'copy-btns';
copyBtnsEle.appendChild(copyTitleBtn);
copyBtnsEle.appendChild(copyDescBtn);
copyBtnsEle.appendChild(copySolnTmplBtn);

// 重试计数器
let retryCounter = 0;

// 初始化元素
function initElements(targetEle) {
    titleEle = targetEle.querySelector('h4[data-cypress=QuestionTitle]');
    descEle = targetEle.querySelector('div.notranslate:not(#question-detail-main-tabs)');
    titleEle.appendChild(copyBtnsEle);
}

function firstInit() {
    const targetEle = document.querySelector("div.notranslate#question-detail-main-tabs");
    if (targetEle && targetEle.querySelector('h4[data-cypress="QuestionTitle"]') !== null) {
        initElements(targetEle);
    } else {
        if (retryCounter++ > 10) {
            console.log('获取元素失败, 重试次数过多, 请刷新页面重试或关闭此脚本.');
            message.error({
                text: '获取元素失败, 重试次数过多, 请刷新页面重试或关闭此脚本.',
                duration: 2000
            });
        } else {
            console.log('获取元素失败, 200ms后重新获取...');
            setTimeout(init, 200);
        }
    }
}

const init = () => {
    // 监听tab栏变化
    const observer = new MutationObserver((mutationList, observer) => {
        mutationList.forEach((mutation) => {
            const tabEle = mutation.addedNodes[0];
            if (mutation.type == 'childList' &&
                typeof(tabEle?.className) === 'string' &&
                tabEle.className.startsWith('description')) {
                initElements(tabEle);
            }
        });
    });
    observer.observe(document.body, { childList: true, subtree: true });
    firstInit();
}

function copyTitleHandler() {
    const title = getTitle();
    // 如果标题中有题号, 则舍弃题号取点后的部分作为短标题返回
    GM_setClipboard(title.includes('.') ? title.substring(title.lastIndexOf('.') + 2) : title);
    message.success({
        text: '复制标题成功',
        duration: 800
    });
}

function copyDescHandler() {
    GM_setClipboard(getDescMd());
    message.success({
        text: '复制题目成功',
        duration: 800
    });
}

function copySolnTmplHandler() {
    GM_setClipboard(`## 题目\n\n[${titleEle.firstElementChild.innerText}](${location.href})\n\n---\n\n${getDescMd()}${afterDesc}${getCodeMd()}`);
    message.success({
        text: '复制成功',
        duration: 800
    });
}

(() => {
    'use strict';

    window.addEventListener('load', init);
})();