// ==UserScript==
// @name         山西焦煤学习-防重复+一键重置+已学统计（修复版）
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  修复了按钮重复问题，保留防重复刷课、一键清空记录、已学数量统计
// @match        *://172.21.12.145/*
// @grant        none
// @run-at       document-idle
// @noframes
// ==/UserScript==

(function() {
    'use strict';

    delete window.Tampermonkey;
    delete window.GM_info;

    const cfg = {
        checkTime: 2500,
        backDelay: 3500,
        nextDelay: 5000,
        reloadWait: 12000
    };

    // 本地已学记录管理
    const STUDIED_KEY = "studied_course_keys";
    function getStudiedSet() {
        try {
            let str = localStorage.getItem(STUDIED_KEY);
            return str ? new Set(JSON.parse(str)) : new Set();
        } catch (e) {
            return new Set();
        }
    }
    function addStudied(key) {
        if (!key) return;
        let s = getStudiedSet();
        s.add(key);
        localStorage.setItem(STUDIED_KEY, JSON.stringify(Array.from(s)));
    }
    function isStudied(key) {
        if (!key) return false;
        return getStudiedSet().has(key);
    }
    // 一键清空已学记录
    function clearStudied() {
        localStorage.removeItem(STUDIED_KEY);
        showLog("🔴 已清空所有已学记录，可换号重刷");
        updateStat();
    }

    // 悬浮日志容器
    let logBox = document.createElement("div");
    logBox.style.position = "fixed";
    logBox.style.bottom = "15px";
    logBox.style.right = "15px";
    logBox.style.background = "rgba(0,0,0,0.8)";
    logBox.style.color = "#00ff00";
    logBox.style.padding = "12px";
    logBox.style.borderRadius = "6px";
    logBox.style.fontSize = "13px";
    logBox.style.zIndex = "999999";
    logBox.style.maxWidth = "320px";
    logBox.style.lineHeight = "1.7";

    // 统计显示行
    let statLine = document.createElement("div");
    statLine.style.marginBottom = "8px";
    statLine.style.borderBottom = "1px solid #444";
    statLine.style.paddingBottom = "6px";

    // 重置按钮（只创建一次）
    let resetBtn = document.createElement("button");
    resetBtn.innerText = "重置已学记录";
    resetBtn.style.marginTop = "8px";
    resetBtn.style.width = "100%";
    resetBtn.style.padding = "5px 0";
    resetBtn.style.border = "none";
    resetBtn.style.borderRadius = "4px";
    resetBtn.style.background = "#e53935";
    resetBtn.style.color = "#fff";
    resetBtn.style.cursor = "pointer";
    resetBtn.style.fontSize = "12px";
    resetBtn.onclick = clearStudied;

    logBox.appendChild(statLine);
    logBox.appendChild(resetBtn);
    document.body.appendChild(logBox);

    // 更新统计
    function updateStat(){
        let set = getStudiedSet();
        let count = set.size;
        statLine.innerHTML = `📊 已学课程：<b>${count}</b> 节`;
    }

    function showLog(txt){
        const time = new Date().toLocaleTimeString();
        const line = `[${time}] ${txt}`;
        // 取出日志部分，避免每次都重新加按钮
        let logs = logBox.querySelectorAll(".log-line");
        let logsArr = Array.from(logs).map(el => el.innerHTML);
        logsArr.unshift(line);
        if(logsArr.length > 10) logsArr.length = 10;
        // 清空日志框，重新组装：统计行 + 日志 + 按钮
        logBox.innerHTML = "";
        logBox.appendChild(statLine);
        logsArr.forEach(log => {
            let lineEl = document.createElement("div");
            lineEl.className = "log-line";
            lineEl.innerHTML = log;
            logBox.appendChild(lineEl);
        });
        logBox.appendChild(resetBtn);
    }

    function wait(ms){
        return new Promise(res=>setTimeout(res,ms));
    }

    function hasVideo(){
        return !!document.querySelector("video");
    }

    function videoIsOver(){
        let v = document.querySelector("video");
        if(!v || v.duration === 0) return false;
        return v.ended || v.currentTime >= v.duration - 2;
    }

    async function safePlayVideo(video) {
        if (!video) return;
        video.muted = true;
        video.playbackRate = 1;
        if(video.paused){
            try{
                await video.play();
                showLog("视频自动播放成功");
            }catch(e){
                video.click();
                showLog("播放拦截，模拟点击播放");
            }
        }
    }

    async function backCourse(){
        let findBack = false;
        document.querySelectorAll("a,button").forEach(el=>{
            let t = el.innerText.trim();
            if(t.includes("返回")){
                el.click();
                findBack = true;
                showLog("点击返回课程");
            }
        });
        if(!findBack){
            history.back();
            showLog("无返回按钮，浏览器后退");
        }
        await wait(cfg.backDelay);
        showLog("已回到课程列表");
    }

    function nextStudy(){
        showLog("正在查找下一节可学习课程");
        let list = document.querySelectorAll("div,tr");
        let target = null;
        let studyKey = null;

        for(let item of list){
            let txt = item.innerText;
            if(!txt.includes("%")) continue;

            let m = txt.match(/(\d+)%/);
            if(!m || Number(m[1]) >= 100) continue;

            let key = txt.slice(0, 100).replace(/\s+/g, "");
            if (isStudied(key)) {
                showLog("跳过已学旧课程");
                continue;
            }

            let btn = item.querySelector("a,button");
            if(btn && (btn.innerText.includes("开始学习") || btn.innerText.includes("继续学习"))){
                target = btn;
                studyKey = key;
                break;
            }
        }

        if(target){
            window._currentStudyKey = studyKey;
            target.click();
            showLog("进入新课程学习");
            return true;
        }
        showLog("✅ 全部课程已刷完");
        return false;
    }

    async function mainLoop(){
        updateStat();
        showLog("脚本启动成功，开始自动刷课");
        let allDone = false;

        while(true){
            await wait(cfg.checkTime);
            updateStat();

            if(allDone){
                await wait(10000);
                continue;
            }

            if(hasVideo()){
                let v = document.querySelector("video");
                await safePlayVideo(v);

                if(videoIsOver()){
                    showLog("本节视频学习完成");
                    if (window._currentStudyKey) {
                        addStudied(window._currentStudyKey);
                        updateStat();
                        showLog("已录入已学列表，不再重复");
                    }

                    await backCourse();
                    await wait(cfg.nextDelay);
                    
                    showLog("刷新页面加载课程列表...");
                    window.location.reload();
                    await wait(cfg.reloadWait);
                    
                    let hasNext = nextStudy();
                    if(!hasNext){
                        allDone = true;
                    }
                }
                continue;
            }

            let hasNext = nextStudy();
            if(!hasNext){
                allDone = true;
            }
        }
    }

    setTimeout(()=>{
        mainLoop();
    },5000);
})();