// ==UserScript==
// @name         无用之脚本，没有任何作用
// @version      3.2
// @description  自动填入答案、自动提交、自动翻页，全流程自动化（带悬浮面板+倒计时）
// @author       Claude Code With DeepSeek-v4
// @match        https://welearn.sflep.com/student/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function() {
  'use strict';

  // ============================================================
  // 默认配置
  // ============================================================
  const DEFAULTS = {
    pageDelay: 3,
    submitDelay: 1.5,
    noAnswerDelay: 1.5,
    betweenCycleDelay: 2,
  };

  function loadConfig() {
    try {
      var saved = localStorage.getItem('autofill_config');
      if (saved) return JSON.parse(saved);
    } catch (e) {}
    return Object.assign({}, DEFAULTS);
  }

  function saveConfig(cfg) {
    try {
      localStorage.setItem('autofill_config', JSON.stringify(cfg));
    } catch (e) {}
  }

  var CONFIG = loadConfig();

  // ============================================================
  // 运行时状态
  // ============================================================
  var STATE = 'idle';
  var currentCycle = 0;
  var stopRequested = false;

  // ============================================================
  // 工具函数
  // ============================================================

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

  function cleanAnswer(raw) {
    if (!raw) return '';
    return raw.replace(/\s+/g, ' ').trim();
  }

  function getIframeDoc(iframe) {
    try {
      return iframe.contentDocument || iframe.contentWindow.document;
    } catch (e) {
      return null;
    }
  }

  function waitForIframeLoad(iframe) {
    return new Promise(function(resolve) {
      var doc = getIframeDoc(iframe);
      if (doc && doc.readyState === 'complete') {
        var body = doc.querySelector('body');
        if (body && body.innerHTML.trim().length > 0) {
          resolve();
          return;
        }
      }
      iframe.addEventListener('load', function handler() {
        iframe.removeEventListener('load', handler);
        resolve();
      });
    });
  }

  function hasAnswers(doc) {
    if (!doc) return false;
    return doc.querySelectorAll(
      'input[data-solution], textarea[data-solution], [data-controltype="choice"] li[data-solution]'
    ).length > 0;
  }

  function setupAutoConfirm(iframe) {
    try {
      var win = iframe.contentWindow;
      if (win) {
        win['CONFIRM_AUTO_CALL'] = [
          { title: '您确定现在提交吗？', action: true },
          { title: '习题答案只能提交一次', action: true },
          { title: '确认继续提交？', action: true },
        ];
      }
    } catch (e) {}
  }

  /**
   * 带倒计时显示的等待
   * @param {number} seconds - 等待秒数
   * @param {string} icon - 图标
   * @param {string} prefix - 文字前缀
   * @param {string} badge - 角标文字
   */
  async function waitWithCountdown(seconds, icon, prefix, badge) {
    var step = (seconds % 1 === 0) ? 1 : 0.5;
    for (var remaining = seconds; remaining > 0; remaining -= step) {
      if (remaining < step) remaining = step; // 防止最后一步变成负数
      updateUI(icon, prefix + remaining.toFixed(1).replace(/\.0$/, '') + 's', badge);
      await sleep(step * 1000);
      if (stopRequested) break;
    }
  }

  // ============================================================
  // 填答案函数
  // ============================================================

  function clickOption(li) {
    var span = li.querySelector('span');
    if (span) { span.click(); } else { li.click(); }
    li.dispatchEvent(new MouseEvent('mousedown', { bubbles: true }));
    li.dispatchEvent(new MouseEvent('mouseup', { bubbles: true }));
  }

  function fillInputs(doc) {
    var inputs = doc.querySelectorAll('input[data-solution]');
    var count = 0;
    inputs.forEach(function(inp) {
      var cleaned = cleanAnswer(inp.getAttribute('data-solution'));
      if (cleaned) {
        inp.value = cleaned;
        inp.dispatchEvent(new Event('input', { bubbles: true }));
        inp.dispatchEvent(new Event('change', { bubbles: true }));
        count++;
      }
    });
    return count;
  }

  function fillTextareas(doc) {
    var textareas = doc.querySelectorAll('textarea[data-solution]');
    var count = 0;
    textareas.forEach(function(ta) {
      var cleaned = cleanAnswer(ta.getAttribute('data-solution'));
      if (cleaned) {
        ta.value = cleaned;
        ta.dispatchEvent(new Event('input', { bubbles: true }));
        ta.dispatchEvent(new Event('change', { bubbles: true }));
        count++;
      }
    });
    return count;
  }

  function fillChoices(doc) {
    var choices = doc.querySelectorAll('[data-controltype="choice"]');
    var count = 0;
    choices.forEach(function(choice) {
      var targetLi = choice.querySelector('li[data-solution]');
      if (targetLi) {
        clickOption(targetLi);
        count++;
      } else {
        var firstLi = choice.querySelector('ul[data-itemtype="options"] li:first-child');
        if (firstLi) {
          clickOption(firstLi);
          count++;
        }
      }
    });
    return count;
  }

  function fillAllAnswers(doc) {
    return fillInputs(doc) + fillTextareas(doc) + fillChoices(doc);
  }

  function clickSubmit(doc) {
    var submitBtn = doc.querySelector('[data-controltype="submit"]');
    if (submitBtn) { submitBtn.click(); return true; }
    return false;
  }

  // ============================================================
  // 悬浮面板 UI
  // ============================================================
  var ui = {};

  function injectUI() {
    var style = document.createElement('style');
    style.textContent = [
      '#autofill-float {',
      '  position: fixed; bottom: 16px; right: 16px; z-index: 2147483647;',
      '  font-family: "Microsoft YaHei", "PingFang SC", sans-serif; font-size: 13px;',
      '  background: rgba(30,30,30,0.92); color: #e0e0e0;',
      '  border-radius: 10px; box-shadow: 0 4px 20px rgba(0,0,0,0.45);',
      '  min-width: 200px; max-width: 280px;',
      '  user-select: none; transition: background 0.3s;',
      '}',
      '#autofill-bar {',
      '  display: flex; align-items: center; justify-content: space-between;',
      '  padding: 8px 12px; cursor: pointer; border-radius: 10px;',
      '}',
      '#autofill-bar:hover { background: rgba(255,255,255,0.06); }',
      '#autofill-icon { font-size: 16px; margin-right: 6px; }',
      '#autofill-msg { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }',
      '#autofill-badge {',
      '  background: #4caf50; color: #fff; font-size: 11px;',
      '  padding: 1px 7px; border-radius: 10px; margin-left: 8px;',
      '  display: none;',
      '}',
      '#autofill-panel {',
      '  display: none; padding: 4px 12px 12px 12px; border-top: 1px solid rgba(255,255,255,0.1);',
      '}',
      '#autofill-panel hr { border: none; border-top: 1px solid rgba(255,255,255,0.08); margin: 6px 0; }',
      '#autofill-panel .row {',
      '  display: flex; justify-content: space-between; align-items: center; padding: 5px 0;',
      '}',
      '#autofill-panel .row span.label { flex: 1; }',
      '#autofill-panel .row input[type=number] {',
      '  width: 52px; padding: 2px 4px; text-align: center;',
      '  border: 1px solid rgba(255,255,255,0.2); border-radius: 4px;',
      '  background: rgba(255,255,255,0.08); color: #81c784; font-size: 13px;',
      '  margin: 0 4px;',
      '}',
      '#autofill-panel .row input[type=number]:focus {',
      '  outline: none; border-color: #4caf50;',
      '}',
      '#autofill-panel .row span.unit { color: #999; font-size: 12px; }',
      '#autofill-panel button {',
      '  width: 100%; padding: 7px 0; margin-top: 4px; border: none; border-radius: 6px;',
      '  font-size: 13px; cursor: pointer; font-weight: bold;',
      '}',
      '#autofill-btn-start { background: #4caf50; color: #fff; }',
      '#autofill-btn-start:hover { background: #43a047; }',
      '#autofill-btn-stop  { background: #f44336; color: #fff; }',
      '#autofill-btn-stop:hover  { background: #e53935; }',
    ].join('\n');
    document.head.appendChild(style);

    var keys = ['pageDelay', 'submitDelay', 'noAnswerDelay', 'betweenCycleDelay'];
    var labels = ['填答案前等待', '提交后等待', '无答案页等待', '翻页后等待'];

    var rows = '';
    for (var i = 0; i < keys.length; i++) {
      rows += [
        '<div class="row">',
        '  <span class="label">' + labels[i] + '</span>',
        '  <input type="number" id="cfg-' + keys[i] + '" min="0" max="60" step="0.5" value="' + CONFIG[keys[i]] + '">',
        '  <span class="unit">秒</span>',
        '</div>',
      ].join('\n');
    }

    var html = [
      '<div id="autofill-float">',
      '  <div id="autofill-bar">',
      '    <span id="autofill-icon">💤</span>',
      '    <span id="autofill-msg">就绪</span>',
      '    <span id="autofill-badge"></span>',
      '  </div>',
      '  <div id="autofill-panel">',
           rows,
      '    <hr>',
      '    <button id="autofill-btn-start">▶ 开始自动</button>',
      '    <button id="autofill-btn-stop" style="display:none">⏹ 停止</button>',
      '  </div>',
      '</div>',
    ].join('\n');

    var container = document.createElement('div');
    container.innerHTML = html;
    document.body.appendChild(container.firstElementChild);

    // 缓存元素
    ui.float   = document.getElementById('autofill-float');
    ui.bar     = document.getElementById('autofill-bar');
    ui.icon    = document.getElementById('autofill-icon');
    ui.msg     = document.getElementById('autofill-msg');
    ui.badge   = document.getElementById('autofill-badge');
    ui.panel   = document.getElementById('autofill-panel');
    ui.btnStart = document.getElementById('autofill-btn-start');
    ui.btnStop  = document.getElementById('autofill-btn-stop');
    ui.inputs   = {};
    keys.forEach(function(k) { ui.inputs[k] = document.getElementById('cfg-' + k); });

    // 折叠/展开
    ui.bar.addEventListener('click', function() {
      ui.panel.style.display = ui.panel.style.display === 'none' ? 'block' : 'none';
    });

    // 输入变更 → 保存
    Object.keys(ui.inputs).forEach(function(k) {
      ui.inputs[k].addEventListener('input', function() {
        var v = parseFloat(this.value);
        if (!isNaN(v) && v >= 0) {
          CONFIG[k] = v;
          saveConfig(CONFIG);
        }
      });
    });

    ui.btnStart.addEventListener('click', function(e) { e.stopPropagation(); startAutomation(); });
    ui.btnStop.addEventListener('click',  function(e) { e.stopPropagation(); stopAutomation(); });
  }

  function updateUI(icon, msg, badge) {
    if (!ui.icon) return;
    ui.icon.textContent = icon || '💤';
    ui.msg.textContent = msg || '就绪';
    if (badge !== undefined && badge !== null && badge !== '') {
      ui.badge.style.display = 'inline-block';
      ui.badge.textContent = badge;
    } else {
      ui.badge.style.display = 'none';
    }
  }

  function setRunningUI(running) {
    if (!ui.btnStart) return;
    if (running) {
      ui.btnStart.style.display = 'none';
      ui.btnStop.style.display = 'block';
      ui.float.style.background = 'rgba(20,20,20,0.94)';
      // 运行时禁止修改配置
      Object.keys(ui.inputs).forEach(function(k) { ui.inputs[k].disabled = true; });
    } else {
      ui.btnStart.style.display = 'block';
      ui.btnStop.style.display = 'none';
      ui.float.style.background = 'rgba(30,30,30,0.92)';
      Object.keys(ui.inputs).forEach(function(k) { ui.inputs[k].disabled = false; });
    }
  }

  // ============================================================
  // 核心自动循环
  // ============================================================

  function stopAutomation() {
    if (STATE === 'idle') return;
    stopRequested = true;
    STATE = 'stopping';
    updateUI('🛑', '正在停止...');
  }

  async function startAutomation() {
    if (STATE === 'running') return;

    // 从输入框同步最新配置
    Object.keys(ui.inputs).forEach(function(k) {
      var v = parseFloat(ui.inputs[k].value);
      if (!isNaN(v) && v >= 0) CONFIG[k] = v;
    });
    saveConfig(CONFIG);

    STATE = 'running';
    stopRequested = false;
    setRunningUI(true);

    var iframe = document.getElementById('contentFrame');
    if (!iframe) {
      updateUI('❌', '未找到 contentFrame');
      setRunningUI(false);
      STATE = 'idle';
      return;
    }

    var reachedEnd = false;
    var origAlert = window.alert;
    window.alert = function(msg) {
      if (typeof msg === 'string' && msg.indexOf('已到达结尾') !== -1) reachedEnd = true;
      origAlert.apply(window, arguments);
    };

    updateUI('⏳', '等待页面加载...');
    await waitForIframeLoad(iframe);
    if (stopRequested) { cleanup(origAlert); return; }

    currentCycle = 0;
    while (!reachedEnd && !stopRequested) {
      currentCycle++;

      // --- 翻页后等待 ---
      await waitWithCountdown(CONFIG.betweenCycleDelay, '⏳', '翻页后等待: ', '#' + currentCycle);
      if (stopRequested) break;

      var iframeDoc = getIframeDoc(iframe);
      if (!iframeDoc) {
        updateUI('⚠️', '无法访问 iframe', '#' + currentCycle);
        await sleep(2000);
        continue;
      }

      setupAutoConfirm(iframe);

      if (hasAnswers(iframeDoc)) {
        // --- 填答案前等待 ---
        await waitWithCountdown(CONFIG.pageDelay, '⏱️', '倒计时: ', '#' + currentCycle);
        if (stopRequested) break;

        // --- 填入 ---
        updateUI('✍️', '正在填入答案...', '#' + currentCycle);
        var count = fillAllAnswers(iframeDoc);

        if (count > 0) {
          // --- 提交 ---
          updateUI('📤', '正在提交...', '#' + currentCycle);
          clickSubmit(iframeDoc);

          // --- 提交后等待 ---
          await waitWithCountdown(CONFIG.submitDelay, '⏱️', '提交后等待: ', '#' + currentCycle);
          if (stopRequested) break;
        }
      } else {
        // --- 无答案页等待 ---
        await waitWithCountdown(CONFIG.noAnswerDelay, '⏭️', '无答案页等待: ', '#' + currentCycle);
        if (stopRequested) break;
      }

      if (reachedEnd) break;

      // --- 翻页 ---
      updateUI('➡️', '前往下一页...', '#' + currentCycle);
      if (typeof NextSCO === 'function') {
        NextSCO();
      } else {
        updateUI('❌', 'NextSCO 不存在');
        break;
      }

      updateUI('⏳', '等待新页面加载...', '#' + currentCycle);
      await waitForIframeLoad(iframe);
    }

    cleanup(origAlert);
  }

  function cleanup(origAlert) {
    window.alert = origAlert;
    STATE = 'idle';
    setRunningUI(false);
    if (stopRequested) {
      updateUI('💤', '已停止', '共' + currentCycle + '页');
    } else {
      updateUI('🏁', '课程结尾', '共' + currentCycle + '页');
    }
    stopRequested = false;
    currentCycle = 0;
  }

  // ============================================================
  // 启动
  // ============================================================

  if (document.readyState === 'complete') {
    injectUI();
  } else {
    window.addEventListener('load', injectUI);
  }
})();