/* Select confirmed local answers. This module never submits forms or changes pages. */
const QBAuto = (() => {
  'use strict';
  const tidy = value => String(value == null ? '' : value).replace(/\u00a0/g, ' ').trim();
  const flat = value => tidy(value).replace(/\s+/gu, '');
  const stemKey = value => flat(tidy(value).replace(/^(?:第\s*\d+\s*题[\s、.．:：]*|\d+\s*[、．]\s*|\d+\.\s+)/u, ''));
  const judgeText = value => /^(正确|对|是|√|true)$/i.test(tidy(value)) ? '正确' : /^(错误|错|否|×|false)$/i.test(tidy(value)) ? '错误' : tidy(value);
  const optionKey = (value, type) => flat(type === 'judge' ? judgeText(value) : value);
  const sorted = values => [...values].sort();
  const optionSet = question => JSON.stringify(sorted(question.options.map(option => optionKey(option.text, question.type))));
  const localCore = supplied => supplied || (typeof QBCore !== 'undefined' ? QBCore : typeof require === 'function' ? require('./core.js') : null);
  const richText = value => {
    const adapter = typeof QBAdapter !== 'undefined' ? QBAdapter : typeof require === 'function' ? require('./adapter.js') : null;
    return adapter ? adapter.richText(value) : tidy(value && typeof value === 'object' ? value.textContent : value);
  };
  const recordIndexes = new WeakMap();
  function candidateRecords(records, question, core) {
    let index = recordIndexes.get(records);
    if (!index || index.core !== core) {
      index = { core, entries: [], byQuestion: new Map(), normalized: new WeakMap() };
      recordIndexes.set(records, index);
    }
    let changed = index.entries.length !== records.length;
    const entries = records.map((record, position) => {
      const rawStem = record && typeof record.stem === 'string' ? record.stem : '';
      const type = record && typeof record.type === 'string' ? record.type : '';
      const old = index.entries[position];
      if (old?.record === record && old.rawStem === rawStem && old.type === type) return old;
      changed = true;
      return { record, rawStem, type, key: rawStem ? JSON.stringify([type, stemKey(rawStem)]) : '' };
    });
    if (changed) {
      index.entries = entries;
      index.byQuestion = new Map();
      for (const entry of entries) {
        if (!entry.key || !entry.record || typeof entry.record !== 'object') continue;
        if (!index.byQuestion.has(entry.key)) index.byQuestion.set(entry.key, []);
        index.byQuestion.get(entry.key).push(entry.record);
      }
    }
    const matches = index.byQuestion.get(JSON.stringify([question.type, stemKey(question.stem)])) || [];
    return matches.map(input => {
      // Only exact-stem candidates need full answer validation. This signature
      // also detects in-place edits to answers/options, not just array replacement.
      let signature;
      try {
        signature = JSON.stringify([input.bankId, input.bankName, input.questionId, input.type, input.stem,
          input.options, input.correctOptionIds, input.answerTexts, input.answerStatus, input.conflicts,
          input.questionIndex, input.contentOccurrence, input.questionIdAliases]);
      } catch (_) { return null; }
      const saved = index.normalized.get(input);
      if (saved && saved.signature === signature) return saved.record;
      try {
        const record = core.normalizeRecord(input);
        index.normalized.set(input, { signature, record });
        return record;
      } catch (_) { return null; }
    }).filter(Boolean);
  }

  function planAnswer(records, current, suppliedCore) {
    const result = (status, message, more = {}) => ({ status, message, labels: [], answerTexts: [], ...more });
    const core = localCore(suppliedCore);
    if (!core || !current || !Array.isArray(records)) return result('unsupported', '当前网页未识别到可自动选择的题目。');
    let question;
    try { question = core.normalizeRecord({ ...current, answerStatus: 'missing' }); }
    catch (_) { return result('unsupported', '当前题目结构不完整，已跳过。'); }
    if (!['single', 'multiple', 'judge'].includes(question.type) || question.options.length < 2 || question.options.length > 100) return result('unsupported', '当前题型暂不支持自动选择。');
    // Repeated text requires mapAnswers to prove the complete option identity or correct set.
    if (new Set(question.options.map(option => option.label)).size !== question.options.length) return result('ambiguous', '当前选项标记重复，无法唯一对应，已跳过。');
    const relevant = [];
    for (const record of candidateRecords(records, question, core)) {
      if (record.type !== question.type || stemKey(record.stem) !== stemKey(question.stem) || optionSet(record) !== optionSet(question)) continue;
      if (question.bankId && record.bankId && question.bankId !== record.bankId) continue;
      if (!record.bankId && question.bankName && question.bankName !== '未命名题库' && record.bankName !== '未命名题库' && flat(record.bankName) !== flat(question.bankName)) continue;
      relevant.push(record);
    }
    let candidates = relevant;
    if (question.bankId) {
      const exactBank = relevant.filter(record => record.bankId === question.bankId);
      if (exactBank.length) candidates = relevant.filter(record => record.bankId === question.bankId || !record.bankId);
    } else if (question.bankName && question.bankName !== '未命名题库') {
      const sameName = relevant.filter(record => flat(record.bankName) === flat(question.bankName));
      if (sameName.length) candidates = sameName;
    }
    if (candidates.some(record => record.answerStatus === 'conflict')) return result('ambiguous', '本地题库存在该题的冲突答案，已跳过。');
    const confirmed = candidates.filter(record => record.answerStatus === 'confirmed');
    if (!confirmed.length) return result('missing', '未找到题干、题型和全部选项一致的已确认答案。');
    const signatures = new Set(confirmed.map(record => JSON.stringify(sorted(record.answerTexts.map(value => optionKey(value, record.type))))));
    if (signatures.size !== 1) return result('ambiguous', '相同题目对应多个不同标准答案，已跳过。');
    const mapped = confirmed.map(record => ({ record, mapping: core.mapAnswers(record, question) }));
    if (mapped.some(item => item.mapping.status !== 'matched' || !item.mapping.labels.length)) return result('ambiguous', '标准答案无法安全对应当前选项，已跳过。');
    const labelSets = new Set(mapped.map(item => JSON.stringify(sorted(item.mapping.labels))));
    if (labelSets.size !== 1) return result('ambiguous', '标准答案对应的选项位置不一致，已跳过。');
    return result('ready', '已找到唯一对应的标准答案。', { labels: [...mapped[0].mapping.labels], answerTexts: [...mapped[0].mapping.answerTexts], record: mapped[0].record });
  }

  function create({ window: win, document: doc, core: suppliedCore, getRecords = () => [], getQuestion = () => null, getBank = () => null, onStatus = () => {}, onChange = () => {} }) {
    const core = localCore(suppliedCore);
    const SITE_FORM = '.yxtulcdsdk-pc-marking-main .yxtulcdsdk-form';
    const GENERIC = 'fieldset, .question, .question-item, [data-question]';
    let state = { enabled: false, busy: false, status: 'idle', message: '自动答题未开启。', answeredCount: 0, skippedCount: 0, lastStem: '' };
    let observer = null, timer = null, interval = null, generation = 0, destroyed = false;
    let attempts = new WeakMap();
    const setTimer = (fn, delay) => win.setTimeout(fn, delay);
    function emit(patch) {
      const before = state;
      state = { ...state, ...patch };
      if (JSON.stringify(before) === JSON.stringify(state)) return;
      try { onChange({ ...state }); } catch (_) { /* UI failures must not affect a page. */ }
      if (before.message !== state.message) try { onStatus(state.message); } catch (_) { /* Ignore callback errors. */ }
    }
    function visible(element) {
      if (!element || !element.isConnected || element.closest('#huayi-qb-root')) return false;
      for (let at = element; at && at.nodeType === 1; at = at.parentElement) {
        if (at.hidden || at.getAttribute('aria-hidden') === 'true') return false;
        const style = win.getComputedStyle?.(at);
        if (style?.display === 'none' || style?.visibility === 'hidden' || style?.visibility === 'collapse') return false;
      }
      return true;
    }
    function labelText(input, container) {
      let label = input.labels && [...input.labels].find(item => container.contains(item));
      if (!label) label = input.closest('label');
      if (label) {
        const rich = label.querySelector('.yxtf-radio__label [data-rich-text], .yxtf-checkbox__label [data-rich-text]');
        if (rich) return richText(rich);
        const clone = (label.querySelector('.yxtf-radio__label, .yxtf-checkbox__label') || label).cloneNode(true);
        clone.querySelectorAll('input,button,script,style').forEach(node => node.remove());
        return richText(clone).replace(/^(?:[A-Z][.、．):：]|\[[A-Z]\])\s*/u, '');
      }
      const labelled = tidy(input.getAttribute('aria-labelledby')).split(/\s+/u).filter(Boolean).map(id => doc.getElementById(id)).filter(node => node && container.contains(node));
      return tidy(labelled.length ? labelled.map(node => richText(node)).join(' ') : input.getAttribute('aria-label'));
    }
    function controls(container, site) {
      const selector = site ? '.yxtulcdsdk-ques-radio input[type="radio"],.yxtulcdsdk-ques-checkbox input[type="checkbox"]' : 'input[type="radio"],input[type="checkbox"]';
      const inputs = [...container.querySelectorAll(selector)].filter(input => site || input.closest(GENERIC) === container);
      if (inputs.length < 2 || inputs.length > 100) return null;
      const types = new Set(inputs.map(input => input.type));
      if (types.size !== 1 || inputs.some(input => input.disabled || input.matches(':disabled') || input.closest('[aria-disabled="true"]'))) return null;
      if (inputs.some(input => !visible(input) && !visible(input.closest('label')))) return null;
      if (!site && inputs[0].type === 'radio' && new Set(inputs.map(input => input.name)).size > 1) return null;
      const texts = inputs.map(input => labelText(input, container));
      if (texts.some(value => !value)) return null;
      return { inputs, texts, type: inputs[0].type === 'checkbox' ? 'multiple' : 'single' };
    }
    function readSite(container) {
      if (!visible(container)) return null;
      const current = getQuestion();
      const bank = getBank();
      if (!current || bank?.loading) return null;
      const set = controls(container, true);
      if (!set || set.inputs.length !== current.options?.length || set.texts.some((value, index) => optionKey(value, current.type) !== optionKey(current.options[index].text, current.type))) return null;
      return { container, inputs: set.inputs, question: current, site: true, bankIdentity: JSON.stringify([bank?.taskId || '', bank?.bankId || '']) };
    }
    function readGeneric(container) {
      if (!visible(container)) return null;
      const set = controls(container, false);
      if (!set) return null;
      const titles = [...container.querySelectorAll(':scope > legend, :scope > .question-title, :scope > [data-question-title], :scope > .question-stem, :scope > .stem, :scope > h2, :scope > h3, :scope > p')].filter(node => visible(node) && !node.querySelector('input'));
      if (titles.length !== 1) return null;
      const stem = richText(titles[0]);
      if (!stem || stem.length > 100000) return null;
      const judged = set.type === 'single' && set.texts.length === 2 && set.texts.map(judgeText).includes('正确') && set.texts.map(judgeText).includes('错误');
      const type = judged ? 'judge' : set.type;
      const question = {
        bankId: tidy(container.getAttribute('data-bank-id')), bankName: tidy(container.getAttribute('data-bank-name')),
        questionId: tidy(container.getAttribute('data-question-id') || container.getAttribute('data-ques-id')), stem, type, options: set.inputs.map((input, index) => ({ id: input.value || input.id || '', text: judged ? judgeText(set.texts[index]) : set.texts[index], label: judged ? judgeText(set.texts[index]) : String.fromCharCode(65 + index) })),
        answerStatus: 'missing', answerTexts: [], correctOptionIds: []
      };
      return { container, inputs: set.inputs, question, site: false };
    }
    function allCandidates() {
      const siteForms = [...doc.querySelectorAll(SITE_FORM)].filter(visible);
      if (siteForms.length) return siteForms.length === 1 ? [readSite(siteForms[0])].filter(Boolean) : [];
      return [...doc.querySelectorAll(GENERIC)].map(readGeneric).filter(Boolean);
    }
    function fingerprint(candidate) {
      const question = candidate.question;
      return JSON.stringify([question.bankId || '', question.bankName || '', candidate.bankIdentity || '', question.questionId || '',
        question.questionIndex ?? null, question.contentOccurrence ?? null, question.type, stemKey(question.stem),
        question.options.map(option => [option.id || '', option.label, optionKey(option.text, question.type)]),
        candidate.inputs.map(input => [input.value, input.id, input.name, input.type])]);
    }
    function stillSame(candidate, mark) {
      if (!candidate.container.isConnected || candidate.inputs.some(input => !input.isConnected || input.disabled)) return false;
      const current = candidate.site ? readSite(candidate.container) : readGeneric(candidate.container);
      return current && fingerprint(current) === mark && current.inputs.length === candidate.inputs.length && current.inputs.every((input, index) => input === candidate.inputs[index]);
    }
    function attempted(candidate, plan) { return `${fingerprint(candidate)}\u001f${plan.status}\u001f${JSON.stringify(sorted(plan.answerTexts || []))}`; }
    function desired(candidate, plan) { return candidate.question.options.map(option => plan.labels.includes(option.label)); }
    function alreadyChosen(candidate, flags) { return candidate.inputs.every((input, index) => Boolean(input.checked) === flags[index]); }
    async function settled(candidate, mark, runGeneration, continuous) {
      // A single Promise only waits one microtask. Vue and native event handlers
      // can schedule further microtasks or a later render before changing values.
      // Observe two distinct task turns before selecting any next option.
      for (let check = 0; check < 2; check++) {
        await new Promise(resolve => globalThis.setTimeout(resolve, 50));
        if (destroyed || generation !== runGeneration || (continuous && !state.enabled)) return 'cancelled';
        if (!stillSame(candidate, mark)) return 'changed';
      }
      return 'stable';
    }
    function skipped(message, stem = '', count = true) {
      emit({ busy: false, status: 'skipped', message, lastStem: stem, skippedCount: state.skippedCount + (count ? 1 : 0) });
      return { status: 'skipped', message };
    }
    async function answerCurrent(options = {}) {
      const continuous = options.continuous === true;
      if (destroyed) return { status: 'cancelled', message: '自动答题已关闭。' };
      if (state.busy) return { status: 'busy', message: '正在处理当前题目。' };
      if (continuous && !state.enabled) return { status: 'cancelled', message: '连续自动选择已暂停。' };
      const candidates = allCandidates();
      if (!candidates.length) return continuous ? { status: 'idle', message: '等待可识别的选择题。' } : skipped('当前网页未识别到明确的题干和选项，已跳过。');
      const prioritized = [...candidates].sort((a, b) => Number(Boolean(b.container.matches('.current,.is-active,[aria-current="true"]'))) - Number(Boolean(a.container.matches('.current,.is-active,[aria-current="true"]'))));
      let candidate, plan, attempt;
      for (const item of prioritized) {
        const proposal = planAnswer(getRecords(), item.question, core);
        const key = attempted(item, proposal);
        if (continuous && attempts.get(item.container) === key) continue;
        candidate = item; plan = proposal; attempt = key; break;
      }
      if (!candidate) return { status: 'idle', message: '当前识别的题目已处理。' };
      const questionStem = candidate.question.stem;
      attempts.set(candidate.container, attempt);
      if (plan.status !== 'ready') return skipped(plan.message, questionStem);
      const flags = desired(candidate, plan);
      if (candidate.question.type !== 'multiple' && flags.filter(Boolean).length !== 1) return skipped('单选或判断题的目标选项不唯一，已跳过。', questionStem);
      if (alreadyChosen(candidate, flags)) {
        emit({ status: 'answered', message: '当前题已选择正确选项。', lastStem: questionStem });
        return { status: 'answered', alreadySelected: true, labels: plan.labels, answerTexts: plan.answerTexts };
      }
      const mark = fingerprint(candidate);
      const runGeneration = generation;
      emit({ busy: true, status: 'matched', message: `正在选择：${plan.answerTexts.join('；')}`, lastStem: questionStem });
      try {
        const initial = await settled(candidate, mark, runGeneration, continuous);
        if (initial === 'cancelled') return { status: 'cancelled', message: '自动选择已暂停。' };
        if (initial !== 'stable') return skipped('题目仍在切换或选项身份变化，已停止本次选择。', questionStem);
        const actions = candidate.question.type === 'multiple'
          ? candidate.inputs.map((input, index) => ({ input, index })).filter(({ input, index }) => Boolean(input.checked) !== flags[index])
          : candidate.inputs.map((input, index) => ({ input, index })).filter(({ index }) => flags[index]);
        for (const { input } of actions) {
          if (destroyed || generation !== runGeneration || (continuous && !state.enabled)) {
            emit({ busy: false, status: 'idle', message: '自动选择已暂停。' });
            return { status: 'cancelled', message: '自动选择已暂停。' };
          }
          if (!stillSame(candidate, mark)) return skipped('点击前题目或选项已变化，已停止本次选择。', questionStem);
          input.click();
          const next = await settled(candidate, mark, runGeneration, continuous);
          if (destroyed || generation !== runGeneration || (continuous && !state.enabled)) {
            emit({ busy: false, status: 'idle', message: '自动选择已暂停。' });
            return { status: 'cancelled', message: '自动选择已暂停。' };
          }
          if (next !== 'stable') return skipped('页面在选择过程中换题或替换控件，已停止后续点击。', questionStem);
        }
        if (!alreadyChosen(candidate, flags)) return skipped('网页未保留预期的选中状态，请人工核对。', questionStem);
        emit({ busy: false, status: 'answered', message: `已选择正确选项：${plan.labels.join('、')}`, answeredCount: state.answeredCount + 1, lastStem: questionStem });
        return { status: 'answered', labels: plan.labels, answerTexts: plan.answerTexts };
      } catch (error) {
        return skipped(`自动选择未完成：${error.message || '控件操作失败'}`, questionStem);
      } finally { if (state.busy) emit({ busy: false }); }
    }
    function schedule() {
      if (!state.enabled || destroyed) return;
      win.clearTimeout(timer);
      timer = setTimer(() => { timer = null; void answerCurrent({ continuous: true }); }, 160);
    }
    function stopObservers() {
      win.clearTimeout(timer); win.clearInterval(interval); timer = null; interval = null;
      if (observer) observer.disconnect(); observer = null;
    }
    function setEnabled(value) {
      if (destroyed) return;
      const enabled = Boolean(value);
      if (state.enabled === enabled) {
        // A page can be hidden while a one-shot selection is awaiting a UI
        // microtask. Calling false must cancel that run even without continuous mode.
        if (!enabled) {
          generation++;
          stopObservers();
          if (state.busy) emit({ busy: false, status: 'idle', message: '自动选择已暂停。' });
        }
        return;
      }
      generation++;
      stopObservers();
      emit({ enabled, busy: false, status: 'idle', message: enabled ? '连续自动选择已开启，仅处理明确匹配的题目。' : '连续自动选择已暂停。' });
      if (!enabled) return;
      attempts = new WeakMap();
      if (win.MutationObserver) {
        observer = new win.MutationObserver(mutations => {
          if (mutations.some(mutation => {
            const element = mutation.target.nodeType === 1 ? mutation.target : mutation.target.parentElement;
            return element && !element.closest('#huayi-qb-root');
          })) schedule();
        });
        observer.observe(doc, { subtree: true, childList: true, characterData: true, attributes: true,
          attributeFilter: ['class', 'hidden', 'disabled', 'aria-disabled', 'value', 'data-question-id', 'data-ques-id', 'data-bank-id'] });
      }
      interval = win.setInterval(schedule, 1500);
      schedule();
    }
    function destroy() { setEnabled(false); stopObservers(); destroyed = true; generation++; }
    return { answerCurrent, setEnabled, isEnabled: () => state.enabled, getState: () => ({ ...state }), destroy };
  }
  return { planAnswer, create };
})();
if (typeof module !== 'undefined' && module.exports) module.exports = QBAuto;