// ==UserScript==
// @name         华医网-广西基层培训自动播放助手（纯免费）
// @namespace    https://local.hyw-assist/
// @version      1.0.1
// @description  自动关闭华医网课程播放页常见弹窗；视频正常播放结束后自动进入下一课。不读取登录凭据，不伪造学习进度。
// @match        *://*.91huayi.com/*
// @run-at       document-start
// @noframes
// @grant        none
// ==/UserScript==

(function () {
  'use strict';

  const CONFIG = {
    autoClosePopup: true,
    autoNext: true,
    autoPlay: true,
    nextDelayMs: 2500,
    popupIntervalMs: 800
  };

  const state = {
    courseList: [],
    currentCourseId: getQueryParam('courseware_id'),
    lastEndedAt: 0
  };

  const COURSE_PLAY_PAGE = /\/exercise\/exercisecourse\/courseplay/i;

  function getQueryParam(name) {
    try {
      return new URLSearchParams(location.search).get(name) || '';
    } catch (error) {
      return '';
    }
  }

  function log(...args) {
    console.log('[华医网学习助手]', ...args);
  }

  function isCoursePlayPage() {
    return COURSE_PLAY_PAGE.test(location.pathname);
  }

  function normalizeCourseList(data) {
    if (Array.isArray(data)) return data;
    if (data && Array.isArray(data.data)) return data.data;
    if (data && Array.isArray(data.list)) return data.list;
    return [];
  }

  function hookCourseListRequest() {
    const origOpen = XMLHttpRequest.prototype.open;
    const origSend = XMLHttpRequest.prototype.send;

    XMLHttpRequest.prototype.open = function (method, url) {
      this.__hywUrl = String(url || '');
      return origOpen.apply(this, arguments);
    };

    XMLHttpRequest.prototype.send = function () {
      this.addEventListener('load', function () {
        try {
          const url = this.__hywUrl || '';
          if (url.indexOf('/OtherCourserList') === -1) return;
          const list = normalizeCourseList(JSON.parse(this.responseText));
          if (list.length) {
            state.courseList = list;
            log('已读取课程列表：', list.length);
          }
        } catch (error) {
          // 忽略解析失败，不影响页面原有逻辑
        }
      });
      return origSend.apply(this, arguments);
    };

    if (window.fetch) {
      const origFetch = window.fetch;
      window.fetch = function (input, init) {
        return origFetch.call(this, input, init).then(function (response) {
          try {
            const url = typeof input === 'string' ? input : (input && input.url) || '';
            if (url.indexOf('/OtherCourserList') === -1) return response;
            response.clone().text().then(function (text) {
              try {
                const list = normalizeCourseList(JSON.parse(text));
                if (list.length) {
                  state.courseList = list;
                  log('已读取课程列表：', list.length);
                }
              } catch (error) {
                // 忽略解析失败
              }
            });
          } catch (error) {
            // 忽略钩子异常
          }
          return response;
        });
      };
    }
  }

  function getCurrentCourseItem() {
    const key = state.currentCourseId;
    return state.courseList.find(function (item) {
      return item.LearningPlan_Courseware_Id === key || item.Courseware_Id === key;
    }) || null;
  }

  function getNextCourseItem() {
    const current = getCurrentCourseItem();
    if (!current || !state.courseList.length) return null;

    const planId = current.LearningPlan_Id;
    const pool = planId
      ? state.courseList.filter(function (item) {
          return item.LearningPlan_Id === planId;
        })
      : state.courseList;
    const sorted = pool.slice().sort(function (a, b) {
      return (a.List_Order || 0) - (b.List_Order || 0);
    });
    const index = sorted.findIndex(function (item) {
      return item.LearningPlan_Courseware_Id === current.LearningPlan_Courseware_Id ||
        item.Courseware_Id === current.Courseware_Id;
    });

    if (index >= 0 && index + 1 < sorted.length) return sorted[index + 1];
    return null;
  }

  function isVisible(element) {
    if (!element) return false;
    const style = window.getComputedStyle(element);
    if (!style) return false;
    if (style.display === 'none' || style.visibility === 'hidden' || style.opacity === '0') return false;
    const rect = element.getBoundingClientRect();
    return rect.width > 0 || rect.height > 0;
  }

  function findVisible(selector) {
    const nodes = document.querySelectorAll(selector);
    for (const node of nodes) {
      if (isVisible(node)) return node;
    }
    return null;
  }

  function clickTextButton(root, texts) {
    const candidates = root.querySelectorAll('button, a, label, div, span');
    for (const candidate of candidates) {
      const text = (candidate.innerText || candidate.textContent || '').trim();
      if (texts.indexOf(text) !== -1 && isVisible(candidate)) {
        candidate.click();
        return true;
      }
    }
    return false;
  }

  function looksLikeOverlay(element) {
    const style = window.getComputedStyle(element);
    const rect = element.getBoundingClientRect();
    return (style.position === 'fixed' || style.position === 'absolute') &&
      rect.width > 0 && rect.height > 0 && (parseInt(style.zIndex, 10) || 0) >= 1000;
  }

  function closePopups() {
    if (!CONFIG.autoClosePopup) return;

    const facePopup = findVisible('.popup_box');
    if (facePopup) {
      if (clickTextButton(facePopup, ['进入课程学习', '继续学习'])) return;
      const faceClose = facePopup.querySelector('.content_close img, .content_close');
      if (faceClose && isVisible(faceClose)) {
        faceClose.click();
        return;
      }
      facePopup.style.display = 'none';
    }

    const reviewPopup = findVisible('.dialog_box_pj');
    if (reviewPopup) {
      const reviewClose = reviewPopup.querySelector('.diaheader_box_pj img, .diaheader_box_pj');
      if (reviewClose && isVisible(reviewClose)) {
        reviewClose.click();
        return;
      }
      reviewPopup.style.display = 'none';
    }

    const mask = findVisible('.mask');
    if (mask) mask.style.display = 'none';

    const tipOk = document.getElementById('TipMsgOk');
    if (tipOk && isVisible(tipOk)) {
      const tipBox = tipOk.closest('[class*="dialog"],[class*="popup"],.mask');
      if (tipBox && isVisible(tipBox)) tipOk.click();
    }

    const overlays = document.querySelectorAll(
      '[class*="popup"],[class*="dialog"],[class*="modal"],[class*="layer"],[class*="mask"]'
    );
    for (const overlay of overlays) {
      if (!isVisible(overlay) || !looksLikeOverlay(overlay)) continue;
      if (overlay.classList.contains('popup_box') ||
          overlay.classList.contains('dialog_box_pj') ||
          overlay.classList.contains('mask')) continue;
      const closeButton = overlay.querySelector('[class*="close"], .layui-layer-close');
      if (closeButton && isVisible(closeButton)) {
        closeButton.click();
        continue;
      }
      overlay.style.display = 'none';
    }
  }

  function clickCourseById(courseId) {
    if (!courseId) return false;
    const nodes = document.querySelectorAll('[onclick]');
    for (const node of nodes) {
      const onclick = node.getAttribute('onclick') || '';
      if (onclick.indexOf('VideoPlay') !== -1 && onclick.indexOf(courseId) !== -1) {
        node.click();
        return true;
      }
    }
    return false;
  }

  function clickNextFromDom() {
    const nodes = Array.prototype.slice.call(document.querySelectorAll('[onclick*="VideoPlay"]'));
    if (!nodes.length || !state.currentCourseId) return false;
    const index = nodes.findIndex(function (node) {
      return (node.getAttribute('onclick') || '').indexOf(state.currentCourseId) !== -1;
    });
    if (index < 0 || index + 1 >= nodes.length) return false;
    nodes[index + 1].click();
    return true;
  }

  function navigateToCourse(courseId) {
    if (!courseId) return;
    location.href = '/exercise/ExerciseCourse/CoursePlay?courseware_id=' + encodeURIComponent(courseId);
  }

  function goToNextCourse() {
    if (!CONFIG.autoNext) return;

    const next = getNextCourseItem();
    if (next && clickCourseById(next.LearningPlan_Courseware_Id || next.Courseware_Id)) {
      log('已点击下一课：', next.Courseware_Name || next.LearningPlan_Courseware_Id);
      return;
    }
    if (clickNextFromDom()) {
      log('已点击下一课（DOM）');
      return;
    }
    if (next) {
      log('正在跳转下一课：', next.Courseware_Name || next.LearningPlan_Courseware_Id);
      navigateToCourse(next.LearningPlan_Courseware_Id || next.Courseware_Id);
    } else {
      log('未找到下一课，可能需要先刷新课程列表');
    }
  }

  function tryPlay(video) {
    if (!video || !video.paused) return;
    const promise = video.play();
    if (promise && promise.catch) promise.catch(function () {});
  }

  function handleVideoEnded() {
    const now = Date.now();
    if (now - state.lastEndedAt < 5000) return;
    state.lastEndedAt = now;
    log('当前视频播放完成，稍后进入下一课');
    setTimeout(goToNextCourse, CONFIG.nextDelayMs);
  }

  function watchVideoPlayer() {
    let currentVideo = null;

    function bindVideo(video) {
      video.addEventListener('ended', handleVideoEnded);
      video.addEventListener('loadedmetadata', function () {
        if (CONFIG.autoPlay) tryPlay(video);
      });
      video.addEventListener('timeupdate', function () {
        if (video.duration && video.currentTime >= video.duration - 1 && video.readyState >= 3) {
          handleVideoEnded();
        }
      });
    }

    function scan() {
      const playerBox = document.getElementById('ccVideo-box') || document;
      const video = playerBox.querySelector('video');
      if (video && video !== currentVideo) {
        currentVideo = video;
        bindVideo(video);
        if (CONFIG.autoPlay) tryPlay(video);
      }
    }

    scan();
    new MutationObserver(scan).observe(document.body, { childList: true, subtree: true });
  }

  function createUI() {
    const box = document.createElement('div');
    box.id = 'hyw-course-assist';
    box.innerHTML =
      '<div class="hyw-assist-title">华医网学习助手</div>' +
      '<label><input type="checkbox" id="hyw-close-popup" checked> 自动关弹窗</label>' +
      '<label><input type="checkbox" id="hyw-auto-next" checked> 自动下一课</label>' +
      '<label><input type="checkbox" id="hyw-auto-play" checked> 自动播放</label>';

    const style = document.createElement('style');
    style.textContent = [
      '#hyw-course-assist{position:fixed;top:80px;right:10px;z-index:2147483646;background:rgba(20,20,20,.88);',
      'color:#fff;padding:10px 12px;border-radius:8px;font:13px/1.6 "Microsoft YaHei",sans-serif;',
      'box-shadow:0 4px 16px rgba(0,0,0,.3);user-select:none;display:flex;flex-direction:column;gap:4px;}',
      '#hyw-course-assist .hyw-assist-title{font-weight:700;margin-bottom:2px;color:#ffd54f;}',
      '#hyw-course-assist label{display:flex;align-items:center;gap:6px;cursor:pointer;white-space:nowrap;}',
      '#hyw-course-assist input{accent-color:#4caf50;}'
    ].join('');
    document.head.appendChild(style);
    document.body.appendChild(box);

    box.querySelector('#hyw-close-popup').addEventListener('change', function (event) {
      CONFIG.autoClosePopup = event.target.checked;
    });
    box.querySelector('#hyw-auto-next').addEventListener('change', function (event) {
      CONFIG.autoNext = event.target.checked;
    });
    box.querySelector('#hyw-auto-play').addEventListener('change', function (event) {
      CONFIG.autoPlay = event.target.checked;
    });
  }

  function start() {
    hookCourseListRequest();
    if (!isCoursePlayPage()) return;

    function init() {
      setInterval(closePopups, CONFIG.popupIntervalMs);
      new MutationObserver(closePopups).observe(document.body, { childList: true, subtree: true });
      watchVideoPlayer();
      createUI();
      log('已启动');
    }

    if (document.body) {
      init();
    } else {
      document.addEventListener('DOMContentLoaded', init, { once: true });
    }
  }

  start();
})();