// ==UserScript==
// @name         市场监管教育在线 自动学习脚本【公益版】
// @namespace    一心向善
// @version      2.1
// @description  自动播放完成mreln.com课程视频，倍速观看，自动续播
// @match        https://www.mreln.com/*
// @match        https://mreln.com/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function () {
  'use strict';

  // ============ 配置 ============
  const CONFIG = {
    speed: 2,              // 播放倍速（服务器最大接受2x）
    checkInterval: 3000,    // 播放状态检查间隔（毫秒）
    keepAliveInterval: 5000 // 后台保活间隔（毫秒）
  };

  const STORAGE_KEY = 'mreln_auto_learning';

  // ============ 全局状态 ============
  let token = '';
  let courseId = '';
  let unitId = '';
  let contentId = '';
  let videoDuration = 0;
  let keepAliveTimer = null;
  let checkTimer = null;

  function log(msg, type) {
    type = type || 'info';
    const colors = { info: '#2196F3', success: '#4CAF50', warn: '#FF9800', error: '#F44336' };
    console.log('%c[自动学习] ' + msg, 'color:' + colors[type] + ';font-weight:bold');
  }

  function sleep(ms) {
    return new Promise(function (r) { setTimeout(r, ms); });
  }

  // ============ 持久化状态 ============
  function getState() {
    try {
      return JSON.parse(localStorage.getItem(STORAGE_KEY)) || { active: false };
    } catch (e) {
      return { active: false };
    }
  }

  function saveState(state) {
    localStorage.setItem(STORAGE_KEY, JSON.stringify(state));
  }

  function clearState() {
    localStorage.removeItem(STORAGE_KEY);
    // 清除API尝试记录
    var keys = Object.keys(localStorage).filter(function(k) { return k.indexOf('mreln_api_attempt_') === 0; });
    keys.forEach(function(k) { localStorage.removeItem(k); });
  }

  // ============ 页面信息提取 ============
  function extractPageInfo() {
    if (window.$CONFIG && window.$CONFIG.token) {
      token = window.$CONFIG.token;
    }
    var courseInput = document.querySelector('input[name="course_id"]');
    if (courseInput) courseId = courseInput.value;
    var unitInput = document.querySelector('input[name="unit_id"]');
    if (unitInput) unitId = unitInput.value;
    var videoBlock = document.querySelector('.block-content.block-video');
    if (videoBlock) contentId = videoBlock.dataset.id;
    var v = document.querySelector('video');
    if (v && v.duration && !isNaN(v.duration)) videoDuration = Math.round(v.duration);
  }

  // ============ 进度检查 ============
  function getCurrentProgress() {
    var progs = document.querySelectorAll('[data-progress]');
    var max = 0;
    for (var i = 0; i < progs.length; i++) {
      var p = parseFloat(progs[i].dataset.progress);
      if (p > max) max = p;
    }
    return max;
  }

  function isLessonComplete() {
    return getCurrentProgress() >= 99;
  }

  // ============ 获取Video.js播放器 ============
  function getPlayer() {
    var playerEl = document.querySelector('.video-js');
    if (!playerEl || !window.videojs) return null;
    try {
      return window.videojs.getPlayer(playerEl.id);
    } catch (e) {
      return null;
    }
  }

  // ============ 核心：播放视频 ============
  function startPlayback() {
    var v = document.querySelector('video');
    var player = getPlayer();
    if (!v || !player) {
      log('未找到视频播放器，等待重试...', 'warn');
      return false;
    }

    log('启动' + CONFIG.speed + '倍速播放...');

    // 从上次进度位置继续播放（跳过已看部分）
    var progress = getCurrentProgress();
    if (progress > 5 && progress < 99) {
      var skipTo = Math.round(videoDuration * progress / 100);
      log('从进度' + progress + '%处继续播放 (跳转到' + skipTo + 's)');
      try { player.currentTime(skipTo); } catch (e) { }
    }

    v.muted = true;
    try { player.playbackRate(CONFIG.speed); } catch (e) { }
    player.play().catch(function (e) {
      log('播放失败: ' + e.message + '，3秒后重试...', 'warn');
      setTimeout(startPlayback, 3000);
    });

    return true;
  }

  // ============ 后台保活 + 自动恢复播放 ============
  function startKeepAlive() {
    if (keepAliveTimer) clearInterval(keepAliveTimer);

    keepAliveTimer = setInterval(function () {
      var state = getState();
      if (!state.active) {
        clearInterval(keepAliveTimer);
        return;
      }

      var v = document.querySelector('video');
      var player = getPlayer();
      if (!v || !player) return;

      // 如果视频暂停了但没结束，自动恢复播放
      if (v.paused && !v.ended && !isLessonComplete()) {
        log('检测到视频暂停，自动恢复播放...');
        v.muted = true;
        try { player.playbackRate(CONFIG.speed); } catch (e) { }
        player.play().catch(function () {
          // 如果play()被浏览器策略阻止，尝试先mute再play
          v.muted = true;
          setTimeout(function () { player.play().catch(function () { }); }, 500);
        });
      }

      // 确保倍速保持
      if (player.playbackRate() !== CONFIG.speed) {
        try { player.playbackRate(CONFIG.speed); } catch (e) { }
        log('恢复倍速为' + CONFIG.speed + 'x');
      }
    }, CONFIG.keepAliveInterval);
  }

  // ============ 监听播放完成 ============
  function startCompletionChecker() {
    if (checkTimer) clearInterval(checkTimer);

    checkTimer = setInterval(function () {
      var state = getState();
      if (!state.active) {
        clearInterval(checkTimer);
        return;
      }

      var v = document.querySelector('video');
      if (!v) return;

      // 视频播放结束 或 进度达到100%
      if (v.ended || isLessonComplete()) {
        clearInterval(checkTimer);
        if (keepAliveTimer) clearInterval(keepAliveTimer);
        log('当前课程播放完成!', 'success');
        navigateToNextLesson();
      } else {
        // 定期输出进度
        var progress = getCurrentProgress();
        var timeStr = Math.round(v.currentTime) + '/' + videoDuration + 's';
        log('播放中: ' + timeStr + ' | 进度: ' + progress + '%');
      }
    }, CONFIG.checkInterval);
  }

  // ============ 课程导航 ============
  function getAllLessons() {
    var menuItems = document.querySelectorAll('.menu-list li, [class*=menu] li');
    var lessons = [];
    for (var i = 0; i < menuItems.length; i++) {
      var link = menuItems[i].querySelector('a');
      if (link && link.href.indexOf('/lesson/') > -1) {
        var progressEl = menuItems[i].querySelector('[data-progress]');
        var p = progressEl ? parseFloat(progressEl.dataset.progress) : 0;
        lessons.push({
          url: link.href,
          progress: p,
          title: menuItems[i].textContent.trim().substring(0, 50),
          active: menuItems[i].classList.contains('active') || menuItems[i].classList.contains('is-active')
        });
      }
    }
    return lessons;
  }

  function findNextLesson() {
    var lessons = getAllLessons();
    var currentUrl = window.location.href;

    // 找当前课程位置
    var currentIdx = -1;
    for (var i = 0; i < lessons.length; i++) {
      if (lessons[i].url === currentUrl || lessons[i].active) {
        currentIdx = i;
        break;
      }
    }

    // 找下一个未完成的课程
    if (currentIdx >= 0) {
      for (var j = currentIdx + 1; j < lessons.length; j++) {
        if (lessons[j].progress < 99) return lessons[j];
      }
    }

    // 从头找未完成的
    for (var k = 0; k < lessons.length; k++) {
      if (lessons[k].progress < 99) return lessons[k];
    }

    return null;
  }

  function navigateToNextLesson() {
    var next = findNextLesson();
    if (next) {
      log('导航到下一节: ' + next.title, 'success');
      window.location.href = next.url;
    } else {
      log('=== 所有课程已完成! ===', 'success');
      clearState();
    }
  }

  // ============ 主流程 ============
  function processCurrentLesson() {
    log('========== 处理当前课程 ==========');
    extractPageInfo();

    if (isLessonComplete()) {
      log('当前课程已完成，跳过', 'success');
      navigateToNextLesson();
      return;
    }

    log('视频时长: ' + videoDuration + 's | 当前进度: ' + getCurrentProgress() + '%');

    // 等待播放器就绪后启动播放
    setTimeout(function () {
      if (startPlayback()) {
        startKeepAlive();
        startCompletionChecker();
      }
    }, 2000);
  }

  function continueLearning() {
    var state = getState();
    if (!state.active) return;

    log('检测到自动学习任务，继续...');
    sleep(3000).then(function () {
      processCurrentLesson();
    });
  }

  function start() {
    var state = getState();
    if (state.active) {
      log('已有任务在运行中，继续执行...');
      continueLearning();
      return;
    }

    log('=== 市场监管教育在线 自动学习脚本启动 ===', 'success');
    log('配置: 倍速=' + CONFIG.speed + 'x | 后台保活=' + (CONFIG.keepAliveInterval / 1000) + '秒间隔');

    saveState({ active: true, startTime: Date.now() });
    continueLearning();
  }

  function stop() {
    clearState();
    if (keepAliveTimer) clearInterval(keepAliveTimer);
    if (checkTimer) clearInterval(checkTimer);
    log('脚本已停止', 'warn');
  }

  // ============ 自动续跑 ============
  var state = getState();
  if (state.active) {
    log('检测到自动学习任务，自动续跑...');
    setTimeout(continueLearning, 2000);
  }

  // ============ 页面可见性监听（回到前台时恢复播放） ============
  document.addEventListener('visibilitychange', function () {
    if (!document.hidden) {
      var state = getState();
      if (state.active) {
        log('页面回到前台，检查播放状态...');
        var v = document.querySelector('video');
        var player = getPlayer();
        if (v && player && v.paused && !v.ended && !isLessonComplete()) {
          v.muted = true;
          try { player.playbackRate(CONFIG.speed); } catch (e) { }
          player.play().catch(function () { });
          log('已恢复播放');
        }
      }
    }
  });

  // ============ 浮动控制面板 ============
  var panel = null;
  var panelTimer = null;

  function createPanel() {
    if (panel) return;
    panel = document.createElement('div');
    panel.id = 'mreln-auto-panel';
    panel.innerHTML =
      '<div style="position:fixed;top:15px;right:15px;z-index:999999;width:260px;' +
      'background:linear-gradient(135deg,#1a237e,#0d47a1);color:#fff;border-radius:12px;' +
      'box-shadow:0 4px 20px rgba(0,0,0,0.3);font-family:Microsoft YaHei,sans-serif;' +
      'overflow:hidden;font-size:13px;">' +
      '<div style="background:rgba(0,0,0,0.2);padding:10px 15px;display:flex;' +
      'justify-content:space-between;align-items:center;cursor:move;" id="mreln-drag">' +
      '<span style="font-weight:bold;font-size:14px;">📚 天府市场监管学习助手</span>' +
      '<span id="mreln-status-dot" style="width:10px;height:10px;border-radius:50%;' +
      'background:#f44336;display:inline-block;"></span>' +
      '</div>' +
      '<div style="padding:12px 15px;">' +
      '<div style="margin-bottom:10px;display:flex;justify-content:space-between;">' +
      '<span style="opacity:0.8;">状态</span>' +
      '<span id="mreln-status-text" style="font-weight:bold;">未启动</span>' +
      '</div>' +
      '<div style="margin-bottom:10px;display:flex;justify-content:space-between;">' +
      '<span style="opacity:0.8;">进度</span>' +
      '<span id="mreln-progress-text">--</span>' +
      '</div>' +
      '<div style="margin-bottom:10px;display:flex;justify-content:space-between;">' +
      '<span style="opacity:0.8;">倍速</span>' +
      '<span id="mreln-speed-text">2.5x</span>' +
      '</div>' +
      '<div style="display:flex;gap:8px;margin-top:12px;">' +
      '<button id="mreln-start-btn" style="flex:1;padding:8px;border:none;border-radius:6px;' +
      'background:#4CAF50;color:#fff;font-size:13px;font-weight:bold;cursor:pointer;">▶ 开始</button>' +
      '<button id="mreln-stop-btn" style="flex:1;padding:8px;border:none;border-radius:6px;' +
      'background:#f44336;color:#fff;font-size:13px;font-weight:bold;cursor:pointer;">⏹ 停止</button>' +
      '</div>' +
      '<div style="margin-top:8px;display:flex;gap:8px;">' +
      '<button id="mreln-hide-btn" style="flex:1;padding:6px;border:none;border-radius:6px;' +
      'background:rgba(255,255,255,0.2);color:#fff;font-size:12px;cursor:pointer;">收起 ▾</button>' +
      '</div>' +
      '</div>' +
      '</div>';
    document.body.appendChild(panel);

    // 按钮事件
    document.getElementById('mreln-start-btn').addEventListener('click', function () {
      start();
    });
    document.getElementById('mreln-stop-btn').addEventListener('click', function () {
      stop();
    });
    document.getElementById('mreln-hide-btn').addEventListener('click', function () {
      var content = panel.querySelector('div:nth-child(2)');
      var btn = document.getElementById('mreln-hide-btn');
      if (content.style.display === 'none') {
        content.style.display = '';
        btn.textContent = '收起 ▾';
      } else {
        content.style.display = 'none';
        btn.textContent = '展开 ▴';
      }
    });

    // 拖动功能
    var dragEl = document.getElementById('mreln-drag');
    var isDragging = false, offsetX = 0, offsetY = 0;
    dragEl.addEventListener('mousedown', function (e) {
      isDragging = true;
      offsetX = e.clientX - panel.offsetLeft;
      offsetY = e.clientY - panel.offsetTop;
      panel.style.transition = 'none';
    });
    document.addEventListener('mousemove', function (e) {
      if (!isDragging) return;
      panel.style.left = (e.clientX - offsetX) + 'px';
      panel.style.top = (e.clientY - offsetY) + 'px';
      panel.style.right = 'auto';
    });
    document.addEventListener('mouseup', function () {
      isDragging = false;
      panel.style.transition = '';
    });

    // 状态更新定时器
    updatePanel();
    panelTimer = setInterval(updatePanel, 2000);
  }

  function updatePanel() {
    if (!panel) return;
    var state = getState();
    var v = document.querySelector('video');
    var dot = document.getElementById('mreln-status-dot');
    var statusText = document.getElementById('mreln-status-text');
    var progressText = document.getElementById('mreln-progress-text');
    var speedText = document.getElementById('mreln-speed-text');

    if (state.active) {
      dot.style.background = '#4CAF50';
      dot.style.boxShadow = '0 0 6px #4CAF50';
      statusText.textContent = v ? (v.paused ? '暂停中(恢复中)' : '播放中') : '运行中';
      statusText.style.color = '#81C784';
    } else {
      dot.style.background = '#f44336';
      dot.style.boxShadow = 'none';
      statusText.textContent = '未启动';
      statusText.style.color = '#fff';
    }

    // 显示视频实际播放进度（实时变化）+ 服务端记录进度
    if (v && v.duration) {
      var playPct = (v.currentTime / v.duration * 100).toFixed(1);
      var cur = Math.round(v.currentTime);
      var dur = Math.round(v.duration);
      var mm = Math.floor(cur / 60), ss = cur % 60;
      var dm = Math.floor(dur / 60), ds = dur % 60;
      var timeStr = mm + ':' + (ss < 10 ? '0' + ss : ss) + '/' + dm + ':' + (ds < 10 ? '0' + ds : ds);
      var serverPct = getCurrentProgress();
      progressText.textContent = playPct + '% | ' + timeStr + ' (记录' + serverPct + '%)';
    } else {
      progressText.textContent = '--';
    }
    speedText.textContent = v ? v.playbackRate + 'x' : CONFIG.speed + 'x';
  }

  // 创建面板（确保DOM就绪）
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', createPanel);
  } else {
    createPanel();
  }

  // ============ 暴露接口 ============
  window.mrelnAuto = {
    start: start,
    stop: stop,
    status: function () {
      var s = getState();
      var v = document.querySelector('video');
      return {
        active: s.active,
        progress: getCurrentProgress(),
        videoTime: v ? Math.round(v.currentTime) + '/' + videoDuration + 's' : 'no video',
        playing: v ? !v.paused : false,
        speed: v ? v.playbackRate : 0
      };
    }
  };

  log('脚本已加载！点击右上角控制面板的"开始"按钮启动');
})();