const adminHealthText = document.querySelector("#adminHealthText");
const refreshBtn = document.querySelector("#refreshBtn");
const panels = {
  accounts: document.querySelector("#accountsPanel"),
  teachers: document.querySelector("#teachersPanel"),
  reviews: document.querySelector("#reviewsPanel"),
  summaries: document.querySelector("#summariesPanel"),
  summarySearch: document.querySelector("#summarySearchPanel"),
  logs: document.querySelector("#logsPanel"),
  register: document.querySelector("#registerPanel"),
};
const accountForm = document.querySelector("#accountForm");
const accountQuery = document.querySelector("#accountQuery");
const accountStatus = document.querySelector("#accountStatus");
const accountMeta = document.querySelector("#accountMeta");
const accountRows = document.querySelector("#accountRows");
const accountEditor = document.querySelector("#accountEditor");
const accountEditorTitle = document.querySelector("#accountEditorTitle");
const accountEditForm = document.querySelector("#accountEditForm");
const accountEditError = document.querySelector("#accountEditError");
const cancelAccountEditBtn = document.querySelector("#cancelAccountEditBtn");
const newAccountBtn = document.querySelector("#newAccountBtn");
const teacherForm = document.querySelector("#teacherForm");
const teacherQuery = document.querySelector("#teacherQuery");
const teacherStatus = document.querySelector("#teacherStatus");
const teacherMeta = document.querySelector("#teacherMeta");
const teacherRows = document.querySelector("#teacherRows");
const teacherEditor = document.querySelector("#teacherEditor");
const teacherEditorTitle = document.querySelector("#teacherEditorTitle");
const teacherEditForm = document.querySelector("#teacherEditForm");
const teacherEditError = document.querySelector("#teacherEditError");
const cancelTeacherEditBtn = document.querySelector("#cancelTeacherEditBtn");
const newTeacherBtn = document.querySelector("#newTeacherBtn");
const editTeacherId = document.querySelector("#editTeacherId");
const editTeacherName = document.querySelector("#editTeacherName");
const editTeacherAlias = document.querySelector("#editTeacherAlias");
const editTeacherStatus = document.querySelector("#editTeacherStatus");
const editTeacherSubjects = document.querySelector("#editTeacherSubjects");
const editTeacherNote = document.querySelector("#editTeacherNote");
const editStudentId = document.querySelector("#editStudentId");
const editStudent = document.querySelector("#editStudent");
const editRemaining = document.querySelector("#editRemaining");
const editStatus = document.querySelector("#editStatus");
const editPayments = document.querySelector("#editPayments");
const editNote = document.querySelector("#editNote");
const reviewStatus = document.querySelector("#reviewStatus");
const reviewMeta = document.querySelector("#reviewMeta");
const reviewRows = document.querySelector("#reviewRows");
const summaryReviewStatus = document.querySelector("#summaryReviewStatus");
const summaryReviewMeta = document.querySelector("#summaryReviewMeta");
const summaryReviewRows = document.querySelector("#summaryReviewRows");
const summaryReviewDrawerBackdrop = document.querySelector("#summaryReviewDrawerBackdrop");
const summaryReviewDrawerClose = document.querySelector("#summaryReviewDrawerClose");
const summaryReviewDrawerTitle = document.querySelector("#summaryReviewDrawerTitle");
const summaryReviewDrawerMeta = document.querySelector("#summaryReviewDrawerMeta");
const summaryReviewDrawerStatus = document.querySelector("#summaryReviewDrawerStatus");
const summaryReviewDrawerCourse = document.querySelector("#summaryReviewDrawerCourse");
const summaryReviewDrawerLine = document.querySelector("#summaryReviewDrawerLine");
const summaryReviewDrawerReasons = document.querySelector("#summaryReviewDrawerReasons");
const summaryReviewDrawerBody = document.querySelector("#summaryReviewDrawerBody");
const summaryReviewDrawerSource = document.querySelector("#summaryReviewDrawerSource");
const summaryReviewDrawerApprove = document.querySelector("#summaryReviewDrawerApprove");
const summaryReviewDrawerReject = document.querySelector("#summaryReviewDrawerReject");
const summarySearchForm = document.querySelector("#summarySearchForm");
const summarySearchQuery = document.querySelector("#summarySearchQuery");
const summarySearchStudent = document.querySelector("#summarySearchStudent");
const summarySearchTeacher = document.querySelector("#summarySearchTeacher");
const summarySearchSubject = document.querySelector("#summarySearchSubject");
const summarySearchDateFrom = document.querySelector("#summarySearchDateFrom");
const summarySearchDateTo = document.querySelector("#summarySearchDateTo");
const summarySearchMissingTime = document.querySelector("#summarySearchMissingTime");
const summarySearchMeta = document.querySelector("#summarySearchMeta");
const summarySearchRows = document.querySelector("#summarySearchRows");
const logOperation = document.querySelector("#logOperation");
const logStatus = document.querySelector("#logStatus");
const logFilterForm = document.querySelector("#logFilterForm");
const logStudent = document.querySelector("#logStudent");
const logMeta = document.querySelector("#logMeta");
const logRows = document.querySelector("#logRows");
const classRegisterForm = document.querySelector("#classRegisterForm");
const classRegisterLines = document.querySelector("#classRegisterLines");
const classRegisterPreview = document.querySelector("#classRegisterPreview");
const classRegisterStatus = document.querySelector("#classRegisterStatus");
const classRegisterConfirm = document.querySelector("#classRegisterConfirm");
const paymentRegisterForm = document.querySelector("#paymentRegisterForm");
const paymentRegisterLines = document.querySelector("#paymentRegisterLines");
const paymentRegisterPreview = document.querySelector("#paymentRegisterPreview");
const paymentRegisterStatus = document.querySelector("#paymentRegisterStatus");
const paymentRegisterConfirm = document.querySelector("#paymentRegisterConfirm");
const summaryRegisterForm = document.querySelector("#summaryRegisterForm");
const summaryRegisterText = document.querySelector("#summaryRegisterText");
const summaryRegisterPreview = document.querySelector("#summaryRegisterPreview");
const summaryRegisterStatus = document.querySelector("#summaryRegisterStatus");
const summaryRegisterConfirm = document.querySelector("#summaryRegisterConfirm");

let currentAccounts = [];
let editingAccountId = "";
let currentTeachers = [];
let editingTeacherId = "";
let currentSummaryReviews = [];
let activeSummaryReview = null;
const registerPreviewState = {
  class_record: null,
  payment: null,
  course_summary: null,
};

function fmtHours(value) {
  const totalMinutes = Math.round(Number(value || 0) * 60);
  const hours = Math.floor(totalMinutes / 60);
  const minutes = totalMinutes % 60;
  return `${hours}小时${minutes}分`;
}

function displayHours(value, fallback) {
  return fallback || fmtHours(value);
}

function fmtTime(seconds) {
  if (!seconds) return "未知";
  return new Date(seconds * 1000).toLocaleString("zh-CN", { hour12: false });
}

function escapeHtml(value) {
  return String(value ?? "")
    .replaceAll("&", "&")
    .replaceAll("<", "&lt;")
    .replaceAll(">", "&gt;")
    .replaceAll('"', "&quot;")
    .replaceAll("'", "&#039;");
}

function metric(label, value) {
  return `<div class="metric"><span>${escapeHtml(label)}</span><strong>${escapeHtml(value)}</strong></div>`;
}

function statusClass(status) {
  if (status === "欠费") return "debt";
  if (status === "预警") return "warning";
  if (status === "正常") return "normal";
  return "closed";
}

function taskStatusClass(status) {
  if (["approved", "auto_registered", "已批准", "自动入账", "完成", "已更新", "已删除"].includes(status)) return "normal";
  if (["rejected", "duplicate", "已驳回", "重复"].includes(status)) return "closed";
  if (status === "conflict" || status === "冲突") return "debt";
  return "warning";
}

function renderPayments(payments) {
  if (!payments.length) return "暂无";
  return payments.map((item) => `${escapeHtml(item.date)}：${escapeHtml(displayHours(item.hours, item.duration))}`).join("<br>");
}

async function fetchJson(url, options = {}) {
  const response = await fetch(url, { cache: "no-store", ...options });
  if (!response.ok) {
    let detail = `${response.status} ${response.statusText}`;
    try {
      const payload = await response.json();
      detail = payload.detail || detail;
    } catch (_error) {
      detail = response.statusText || detail;
    }
    throw new Error(detail);
  }
  return response.json();
}

function setActiveTab(tabName) {
  document.querySelectorAll("[data-admin-tab]").forEach((button) => {
    button.classList.toggle("is-active", button.dataset.adminTab === tabName);
  });
  Object.entries(panels).forEach(([name, panel]) => {
    panel.hidden = name !== tabName;
  });
  if (tabName === "accounts") loadAccounts();
  if (tabName === "teachers") loadTeachers();
  if (tabName === "reviews") loadReviews();
  if (tabName === "summaries") loadSummaryReviews();
  if (tabName === "summarySearch") loadSummarySearch();
  if (tabName === "logs") loadOperationLogs();
}

async function loadAdminHealth() {
  try {
    const data = await fetchJson("/api/account-health");
    const teacherText = data.teachers_count === undefined ? "" : `；老师 ${data.teachers_count} 位`;
    adminHealthText.textContent = `账户 ${data.accounts_count} 人${teacherText}；数据更新时间 ${fmtTime(data.accounts.mtime)}`;
  } catch (error) {
    adminHealthText.textContent = `读取失败：${error.message}`;
  }
}

function renderAccountSummary(summary, count) {
  accountMeta.innerHTML = [
    metric("当前结果", `${count} 人`),
    metric("欠费", summary.debt),
    metric("预警", summary.warning),
    metric("正常", summary.normal),
  ].join("");
}

async function loadAccounts() {
  accountRows.innerHTML = `<tr><td colspan="6" class="empty">正在读取</td></tr>`;
  const params = new URLSearchParams();
  if (accountQuery.value.trim()) params.set("q", accountQuery.value.trim());
  if (accountStatus.value) params.set("status", accountStatus.value);
  try {
    const data = await fetchJson(`/api/accounts?${params.toString()}`);
    currentAccounts = data.accounts;
    renderAccountSummary(data.summary, data.count);
    accountRows.innerHTML = data.accounts
      .map(
        (row) => `<tr>
          <td>${escapeHtml(row.student)}<br><small>${escapeHtml(row.student_id)}</small></td>
          <td><span class="status ${statusClass(row.account_status)}">${escapeHtml(row.account_status)}</span></td>
          <td class="num">${escapeHtml(displayHours(row.remaining, row.remaining_duration))}</td>
          <td>${renderPayments(row.payments)}</td>
          <td class="note-cell">${escapeHtml(row.note || "")}</td>
          <td><button class="small-button account-edit" type="button" data-student-id="${escapeHtml(row.student_id)}">编辑</button></td>
        </tr>`,
      )
      .join("");
    if (!data.accounts.length) {
      accountRows.innerHTML = `<tr><td colspan="6" class="empty">没有符合条件的账户</td></tr>`;
    }
  } catch (error) {
    accountRows.innerHTML = `<tr><td colspan="6" class="empty">读取失败：${escapeHtml(error.message)}</td></tr>`;
  }
}

function paymentsToText(payments) {
  return payments.map((item) => `${item.date}:${displayHours(item.hours, item.duration)}`).join("\n");
}

function parseHoursInput(value) {
  const text = String(value || "").trim();
  const match = text.match(/^(\d+)小时(?:(\d+)分)?$/);
  if (match) return Number(match[1]) + Number(match[2] || 0) / 60;
  const minuteMatch = text.match(/^(\d+)分$/);
  if (minuteMatch) return Number(minuteMatch[1]) / 60;
  return Number(text);
}

function parsePaymentsInput(value) {
  return value
    .split(/[\n,]+/)
    .map((item) => item.trim())
    .filter(Boolean)
    .map((item) => {
      const [date, hoursText] = item.split(":");
      if (!date || hoursText === undefined) {
        throw new Error(`缴费记录格式错误：${item}`);
      }
      const hours = parseHoursInput(hoursText);
      if (!Number.isFinite(hours)) {
        throw new Error(`缴费课时格式错误：${item}`);
      }
      return { date: date.trim(), hours };
    });
}

function openNewAccountEditor() {
  editingAccountId = "";
  accountEditorTitle.textContent = "新增账户";
  editStudentId.value = "";
  editStudentId.placeholder = "保存时自动生成";
  editStudent.value = "";
  editRemaining.value = "0";
  editStatus.value = "正常";
  editPayments.value = "";
  editNote.value = "";
  accountEditError.hidden = true;
  accountEditor.hidden = false;
  editStudent.focus();
}

function openEditAccountEditor(studentId) {
  const account = currentAccounts.find((item) => item.student_id === studentId);
  if (!account) return;
  editingAccountId = account.student_id;
  accountEditorTitle.textContent = `编辑账户：${account.student}`;
  editStudentId.value = account.student_id;
  editStudentId.placeholder = "";
  editStudent.value = account.student;
  editRemaining.value = account.remaining;
  editStatus.value = account.account_status;
  editPayments.value = paymentsToText(account.payments);
  editNote.value = account.note || "";
  accountEditError.hidden = true;
  accountEditor.hidden = false;
  editStudent.focus();
}

function buildAccountPayload() {
  const remaining = Number(editRemaining.value);
  if (!Number.isFinite(remaining)) {
    throw new Error("剩余课时必须是数字");
  }
  return {
    student_id: editStudentId.value.trim(),
    student: editStudent.value.trim(),
    payments: parsePaymentsInput(editPayments.value),
    remaining,
    account_status: editStatus.value,
    note: editNote.value.trim(),
  };
}

async function saveAccount(event) {
  event.preventDefault();
  try {
    const payload = buildAccountPayload();
    const url = editingAccountId
      ? `/api/admin/accounts/${encodeURIComponent(editingAccountId)}`
      : "/api/admin/accounts";
    const method = editingAccountId ? "PUT" : "POST";
    await fetchJson(url, {
      method,
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    });
    accountEditor.hidden = true;
    await loadAdminHealth();
    await loadAccounts();
  } catch (error) {
    accountEditError.textContent = error.message;
    accountEditError.hidden = false;
  }
}

function renderTeacherSummary(rows) {
  const activeCount = rows.filter((item) => item.status === "在岗").length;
  const aliasCount = rows.filter((item) => String(item.alias || "").trim()).length;
  teacherMeta.innerHTML = [
    metric("当前结果", `${rows.length} 位`),
    metric("在岗", activeCount),
    metric("已配置别名", aliasCount),
  ].join("");
}

function teacherMatches(row) {
  const keyword = teacherQuery.value.trim();
  if (teacherStatus.value && row.status !== teacherStatus.value) return false;
  if (!keyword) return true;
  const haystack = [
    row.teacher_id,
    row.name,
    row.alias,
    row.display_name,
    ...(row.subjects || []),
    row.status,
    row.note,
  ].join("\n");
  return haystack.includes(keyword);
}

async function loadTeachers() {
  teacherRows.innerHTML = `<tr><td colspan="6" class="empty">正在读取</td></tr>`;
  try {
    const data = await fetchJson("/api/admin/teachers");
    currentTeachers = data.teachers || [];
    const rows = currentTeachers.filter(teacherMatches);
    renderTeacherSummary(rows);
    teacherRows.innerHTML = rows
      .map(
        (row) => `<tr>
          <td>${escapeHtml(row.name)}<br><small>${escapeHtml(row.teacher_id)}</small></td>
          <td>${escapeHtml(row.alias || "")}</td>
          <td>${escapeHtml((row.subjects || []).join("、"))}</td>
          <td><span class="status ${row.status === "在岗" ? "normal" : "closed"}">${escapeHtml(row.status)}</span></td>
          <td class="note-cell">${escapeHtml(row.note || "")}</td>
          <td><button class="small-button teacher-edit" type="button" data-teacher-id="${escapeHtml(row.teacher_id)}">编辑</button></td>
        </tr>`,
      )
      .join("");
    if (!rows.length) {
      teacherRows.innerHTML = `<tr><td colspan="6" class="empty">没有符合条件的老师档案</td></tr>`;
    }
  } catch (error) {
    teacherRows.innerHTML = `<tr><td colspan="6" class="empty">读取失败：${escapeHtml(error.message)}</td></tr>`;
  }
}

function openNewTeacherEditor() {
  editingTeacherId = "";
  teacherEditorTitle.textContent = "新增老师";
  editTeacherId.value = "";
  editTeacherId.placeholder = "保存时自动生成";
  editTeacherName.value = "";
  editTeacherAlias.value = "";
  editTeacherSubjects.value = "";
  editTeacherStatus.value = "在岗";
  editTeacherNote.value = "";
  teacherEditError.hidden = true;
  teacherEditor.hidden = false;
  editTeacherName.focus();
}

function openEditTeacherEditor(teacherId) {
  const teacher = currentTeachers.find((item) => item.teacher_id === teacherId);
  if (!teacher) return;
  editingTeacherId = teacher.teacher_id;
  teacherEditorTitle.textContent = `编辑老师：${teacher.name}`;
  editTeacherId.value = teacher.teacher_id;
  editTeacherId.placeholder = "";
  editTeacherName.value = teacher.name;
  editTeacherAlias.value = teacher.alias || "";
  editTeacherSubjects.value = (teacher.subjects || []).join("、");
  editTeacherStatus.value = teacher.status;
  editTeacherNote.value = teacher.note || "";
  teacherEditError.hidden = true;
  teacherEditor.hidden = false;
  editTeacherName.focus();
}

function parseTeacherSubjects(value) {
  return value
    .split(/[、,，\s]+/)
    .map((item) => item.trim())
    .filter(Boolean);
}

function buildTeacherPayload() {
  return {
    teacher_id: editTeacherId.value.trim(),
    name: editTeacherName.value.trim(),
    alias: editTeacherAlias.value.trim(),
    subjects: parseTeacherSubjects(editTeacherSubjects.value),
    status: editTeacherStatus.value,
    note: editTeacherNote.value.trim(),
  };
}

async function saveTeacher(event) {
  event.preventDefault();
  try {
    const payload = buildTeacherPayload();
    const url = editingTeacherId
      ? `/api/admin/teachers/${encodeURIComponent(editingTeacherId)}`
      : "/api/admin/teachers";
    const method = editingTeacherId ? "PUT" : "POST";
    await fetchJson(url, {
      method,
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(payload),
    });
    teacherEditor.hidden = true;
    await loadTeachers();
  } catch (error) {
    teacherEditError.textContent = error.message;
    teacherEditError.hidden = false;
  }
}

function renderReviewLine(line) {
  return `<code class="line-code">${escapeHtml(line)}</code>`;
}

function reviewTaskTypeLabel(item) {
  if (item.type === "class_record_deletion") return "删除";
  return "纠错";
}

function renderReviewTarget(item) {
  if (item.type === "class_record_deletion") {
    const restored = item.original && item.original.duration_hours ? `通过后恢复 ${fmtHours(item.original.duration_hours)}` : "通过后恢复课时";
    return `<span class="status closed">删除</span><br><small>${escapeHtml(restored)}</small>`;
  }
  return renderReviewLine(item.corrected_line);
}

async function loadReviews() {
  reviewRows.innerHTML = `<tr><td colspan="7" class="empty">正在读取</td></tr>`;
  try {
    const [correctionData, deletionData] = await Promise.all([
      fetchJson(`/api/admin/tasks?${new URLSearchParams({ type: "class_record_correction", ...(reviewStatus.value ? { status: reviewStatus.value } : {}) }).toString()}`),
      fetchJson(`/api/admin/tasks?${new URLSearchParams({ type: "class_record_deletion", ...(reviewStatus.value ? { status: reviewStatus.value } : {}) }).toString()}`),
    ]);
    const items = [...(correctionData.items || []), ...(deletionData.items || [])].sort((a, b) => Number(b.id || 0) - Number(a.id || 0));
    reviewMeta.innerHTML = [metric("当前结果", `${items.length} 条`)].join("");
    reviewRows.innerHTML = items
      .map((item) => {
        const canReview = item.status === "pending" || item.status === "conflict";
        return `<tr>
          <td>#${escapeHtml(item.id)}</td>
          <td><span class="status ${item.status === "approved" ? "normal" : item.status === "rejected" ? "closed" : item.status === "conflict" ? "debt" : "warning"}">${escapeHtml(item.status)}</span>${item.message ? `<br><small>${escapeHtml(item.message)}</small>` : ""}</td>
          <td>${escapeHtml(reviewTaskTypeLabel(item))}</td>
          <td>${renderReviewLine(item.original_line)}</td>
          <td>${renderReviewTarget(item)}</td>
          <td>${escapeHtml(item.created_at || "")}</td>
          <td class="record-action-cell">
            <div class="record-actions">
              <button class="small-button review-approve" type="button" data-task-id="${escapeHtml(item.id)}" ${canReview ? "" : "disabled"}>批准</button>
              <button class="small-button review-reject" type="button" data-task-id="${escapeHtml(item.id)}" ${canReview ? "" : "disabled"}>驳回</button>
            </div>
          </td>
        </tr>`;
      })
      .join("");
    if (!items.length) {
      reviewRows.innerHTML = `<tr><td colspan="7" class="empty">没有符合条件的审核项</td></tr>`;
    }
  } catch (error) {
    reviewRows.innerHTML = `<tr><td colspan="7" class="empty">读取失败：${escapeHtml(error.message)}</td></tr>`;
  }
}

function summaryReviewKind(item) {
  const sourceId = String(item.source_id || "");
  const reasons = Array.isArray(item.reasons) ? item.reasons.join(" ") : "";
  if (sourceId.startsWith("history-missing:") || reasons.includes("历史 classnotes缺失")) {
    return "历史缺失";
  }
  return "";
}

function renderReviewTag(label) {
  if (!label) return "";
  return `<span class="review-tag history">${escapeHtml(label)}</span>`;
}

function renderSummaryInfo(summary, item = {}) {
  const parts = [
    summary.student,
    summary.date_iso,
    summary.time_range,
    summary.teacher,
    summary.subject,
  ].filter(Boolean);
  return `${renderReviewTag(summaryReviewKind(item))}${parts.map(escapeHtml).join("<br>")}<br><small>${escapeHtml(summary.group || "")}</small>`;
}

function renderSummaryPreview(summary) {
  const body = String(summary.body || "");
  const preview = body.length > 140 ? `${body.slice(0, 140)}...` : body;
  return `<div class="summary-body summary-preview">${escapeHtml(preview || "暂无原文")}</div>`;
}

function findSummaryReview(taskId) {
  return currentSummaryReviews.find((item) => String(item.id) === String(taskId));
}

function canReviewSummary(item) {
  return item && (item.status === "pending" || item.status === "conflict");
}

function courseInfoLines(summary) {
  return [
    summary.student ? `学生：${summary.student}` : "",
    summary.date_iso ? `日期：${summary.date_iso}` : "",
    summary.time_range ? `时间：${summary.time_range}` : "",
    summary.teacher || summary.subject ? `老师/科目：${summary.teacher || ""} ${summary.subject || ""}`.trim() : "",
    summary.group ? `班级/分组：${summary.group}` : "",
  ].filter(Boolean);
}

function openSummaryReviewDrawer(taskId) {
  const item = findSummaryReview(taskId);
  if (!item) return;
  const summary = item.summary || {};
  const reasons = Array.isArray(item.reasons) ? item.reasons : [];
  const kind = summaryReviewKind(item);
  const canReview = canReviewSummary(item);
  activeSummaryReview = item;

  summaryReviewDrawerTitle.textContent = `课程小结详情 #${item.id}`;
  summaryReviewDrawerMeta.innerHTML = [
    item.created_at ? `提交时间：${escapeHtml(item.created_at)}` : "",
    kind ? renderReviewTag(kind) : "",
  ].filter(Boolean).join(" ");
  summaryReviewDrawerStatus.innerHTML = `<span class="status ${taskStatusClass(item.status)}">${escapeHtml(item.status || "")}</span>${item.message ? ` <small>${escapeHtml(item.message)}</small>` : ""}`;
  summaryReviewDrawerCourse.innerHTML = courseInfoLines(summary).map(escapeHtml).join("<br>") || "暂无课程信息";
  summaryReviewDrawerLine.innerHTML = item.proposed_line ? renderReviewLine(item.proposed_line) : "<span class=\"muted\">暂无</span>";
  summaryReviewDrawerReasons.innerHTML = reasons.length ? reasons.map(escapeHtml).join("<br>") : "待人工复核";
  summaryReviewDrawerBody.textContent = summary.body || "暂无原文";
  summaryReviewDrawerSource.innerHTML = [
    item.source_id ? `来源ID：${escapeHtml(item.source_id)}` : "",
    item.saved_path ? `保存文件：${escapeHtml(item.saved_path)}` : "",
    item.batch_id ? `批次：${escapeHtml(item.batch_id)}` : "",
  ].filter(Boolean).join("<br>") || "暂无来源信息";
  summaryReviewDrawerApprove.disabled = !canReview;
  summaryReviewDrawerReject.disabled = !canReview;
  summaryReviewDrawerBackdrop.hidden = false;
}

function closeSummaryReviewDrawer() {
  activeSummaryReview = null;
  summaryReviewDrawerBackdrop.hidden = true;
}

async function loadSummaryReviews() {
  summaryReviewRows.innerHTML = `<tr><td colspan="7" class="empty">正在读取</td></tr>`;
  const params = new URLSearchParams({ type: "course_summary_review" });
  if (summaryReviewStatus.value) params.set("status", summaryReviewStatus.value);
  try {
    const data = await fetchJson(`/api/admin/tasks?${params.toString()}`);
    currentSummaryReviews = data.items || [];
    summaryReviewMeta.innerHTML = [metric("当前结果", `${data.count} 条`)].join("");
    summaryReviewRows.innerHTML = currentSummaryReviews
      .map((item) => {
        const canReview = canReviewSummary(item);
        const summary = item.summary || {};
        const reasons = Array.isArray(item.reasons) ? item.reasons : [];
        return `<tr>
          <td>#${escapeHtml(item.id)}</td>
          <td><span class="status ${taskStatusClass(item.status)}">${escapeHtml(item.status)}</span>${item.message ? `<br><small>${escapeHtml(item.message)}</small>` : ""}</td>
          <td>${renderSummaryInfo(summary, item)}</td>
          <td>${item.proposed_line ? renderReviewLine(item.proposed_line) : "<span class=\"muted\">暂无</span>"}</td>
          <td>${renderSummaryPreview(summary)}</td>
          <td>${reasons.map(escapeHtml).join("<br>") || "待人工复核"}</td>
          <td class="record-action-cell">
            <div class="record-actions">
              <button class="small-button summary-detail" type="button" data-task-id="${escapeHtml(item.id)}">查看详情</button>
              <button class="small-button summary-approve" type="button" data-task-id="${escapeHtml(item.id)}" ${canReview ? "" : "disabled"}>批准</button>
              <button class="small-button summary-reject" type="button" data-task-id="${escapeHtml(item.id)}" ${canReview ? "" : "disabled"}>驳回</button>
            </div>
          </td>
        </tr>`;
      })
      .join("");
    if (!currentSummaryReviews.length) {
      summaryReviewRows.innerHTML = `<tr><td colspan="7" class="empty">没有符合条件的课程小结审核项</td></tr>`;
    }
  } catch (error) {
    currentSummaryReviews = [];
    summaryReviewRows.innerHTML = `<tr><td colspan="7" class="empty">读取失败：${escapeHtml(error.message)}</td></tr>`;
  }
}

function summarySearchParams() {
  const params = new URLSearchParams({ limit: "200" });
  if (summarySearchQuery.value.trim()) params.set("q", summarySearchQuery.value.trim());
  if (summarySearchStudent.value.trim()) params.set("student", summarySearchStudent.value.trim());
  if (summarySearchTeacher.value.trim()) params.set("teacher", summarySearchTeacher.value.trim());
  if (summarySearchSubject.value.trim()) params.set("subject", summarySearchSubject.value.trim());
  if (summarySearchDateFrom.value) params.set("date_from", summarySearchDateFrom.value);
  if (summarySearchDateTo.value) params.set("date_to", summarySearchDateTo.value);
  if (summarySearchMissingTime.value) params.set("missing_time", "true");
  return params;
}

function renderSummarySearchBody(item) {
  const fullId = `summary-full-${item.id}`;
  const hasFull = String(item.body || "") !== String(item.body_preview || "");
  return `<div class="summary-body">${escapeHtml(item.body_preview || "")}</div>
    <div id="${escapeHtml(fullId)}" class="summary-body summary-full" hidden>${escapeHtml(item.body || "")}</div>
    <button class="small-button summary-toggle" type="button" data-target="${escapeHtml(fullId)}" ${hasFull ? "" : "hidden"}>展开</button>`;
}

function renderSummaryActions(item) {
  if (item.time_range) {
    return `<span class="muted">已完整</span>`;
  }
  const inputId = `summary-time-${item.id}`;
  return `<div class="summary-time-actions">
    <input id="${escapeHtml(inputId)}" class="summary-time-input" data-summary-time-input="${escapeHtml(item.id)}" autocomplete="off" placeholder="08:00-10:00" />
    <button class="small-button summary-time-save" type="button" data-summary-id="${escapeHtml(item.id)}">补齐时间</button>
    <button class="small-button summary-delete" type="button" data-summary-id="${escapeHtml(item.id)}">删除</button>
  </div>`;
}

function renderMatchedFields(item) {
  const fields = Array.isArray(item.matched_fields) ? item.matched_fields : [];
  return fields.length ? `<br><small>命中：${fields.map(escapeHtml).join("、")}</small>` : "";
}

async function loadSummarySearch() {
  summarySearchRows.innerHTML = `<tr><td colspan="7" class="empty">正在读取</td></tr>`;
  try {
    const data = await fetchJson(`/api/admin/course-summaries?${summarySearchParams().toString()}`);
    summarySearchMeta.innerHTML = [
      metric("命中小结", `${data.count} 条`),
      metric("当前显示", `${data.returned} 条`),
    ].join("");
    summarySearchRows.innerHTML = data.items
      .map((item) => `<tr>
        <td>${escapeHtml(item.date_iso || "未识别")}</td>
        <td>${escapeHtml(item.time_range || "缺少时间")}</td>
        <td>${escapeHtml(item.student || "")}<br><small>${escapeHtml(item.group || "")}</small></td>
        <td>${escapeHtml(item.teacher || "待核对老师")}<br><small>${escapeHtml(item.subject || "待核对科目")}</small></td>
        <td>${escapeHtml(item.title || "")}${renderMatchedFields(item)}</td>
        <td>${renderSummarySearchBody(item)}</td>
        <td>${renderSummaryActions(item)}</td>
      </tr>`)
      .join("");
    if (!data.items.length) {
      summarySearchRows.innerHTML = `<tr><td colspan="7" class="empty">没有符合条件的课程小结</td></tr>`;
    }
  } catch (error) {
    summarySearchRows.innerHTML = `<tr><td colspan="7" class="empty">读取失败：${escapeHtml(error.message)}</td></tr>`;
  }
}

async function updateCourseSummaryTime(summaryId, timeRange) {
  await fetchJson(`/api/admin/course-summaries/${encodeURIComponent(summaryId)}/time`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ time_range: timeRange }),
  });
  await loadSummarySearch();
}

async function deleteCourseSummary(summaryId) {
  await fetchJson(`/api/admin/course-summaries/${encodeURIComponent(summaryId)}`, {
    method: "DELETE",
  });
  await loadSummarySearch();
}

function renderLogDetail(item) {
  const details = [];
  if (item.task_type) details.push(`类型：${item.task_type}`);
  if (item.source_id) details.push(`来源：${item.source_id}`);
  if (item.student_id) details.push(`学生ID：${item.student_id}`);
  if (item.teacher_id) details.push(`教师ID：${item.teacher_id}`);
  if (item.teacher || item.subject) details.push(`老师/科目：${item.teacher || ""} ${item.subject || ""}`.trim());
  if (item.time_range) details.push(`时间：${item.time_range}`);
  if (item.proposed_line) details.push(`记录：${item.proposed_line}`);
  if (Array.isArray(item.reasons) && item.reasons.length) details.push(`原因：${item.reasons.join("；")}`);
  if (item.error) details.push(`错误：${item.error}`);
  if (item.backup_id) details.push(`备份：${item.backup_id}`);
  if (item.target_log_id) details.push(`撤回记录：${item.target_log_id}`);
  if (item.target_backup_id) details.push(`撤回备份：${item.target_backup_id}`);
  if (Array.isArray(item.restored_files) && item.restored_files.length) details.push(`恢复文件：${item.restored_files.join("；")}`);
  if (item.saved_path) details.push(`文件：${item.saved_path}`);
  return `<div class="log-detail">${details.map(escapeHtml).join("<br>") || "暂无详情"}</div>`;
}

function renderLogActions(item) {
  if (item.can_rollback) {
    return `<button class="small-button log-rollback" type="button" data-log-id="${escapeHtml(item.id)}">撤回</button>`;
  }
  if (item.backup_id && item.rollback_block_reason) {
    return `<small class="muted">${escapeHtml(item.rollback_block_reason)}</small>`;
  }
  return `<span class="muted">-</span>`;
}

async function loadOperationLogs() {
  logRows.innerHTML = `<tr><td colspan="7" class="empty">正在读取</td></tr>`;
  const params = new URLSearchParams({ limit: "200" });
  if (logOperation.value) params.set("operation", logOperation.value);
  if (logStatus.value) params.set("status", logStatus.value);
  if (logStudent.value.trim()) params.set("student", logStudent.value.trim());
  try {
    const data = await fetchJson(`/api/admin/operation-logs?${params.toString()}`);
    logMeta.innerHTML = [metric("当前结果", `${data.count} 条`)].join("");
    logRows.innerHTML = data.items
      .map((item) => `<tr>
        <td>${escapeHtml(item.created_at || "")}</td>
        <td>${escapeHtml(item.operation || "")}</td>
        <td><span class="status ${taskStatusClass(item.status)}">${escapeHtml(item.status || "")}</span></td>
        <td>${escapeHtml(item.student || "")}</td>
        <td>${escapeHtml(item.batch_id || "")}${item.task_id ? `<br><small>任务 #${escapeHtml(item.task_id)}</small>` : ""}</td>
        <td>${renderLogDetail(item)}</td>
        <td class="record-action-cell">${renderLogActions(item)}</td>
      </tr>`)
      .join("");
    if (!data.items.length) {
      logRows.innerHTML = `<tr><td colspan="7" class="empty">没有符合条件的操作记录</td></tr>`;
    }
  } catch (error) {
    logRows.innerHTML = `<tr><td colspan="7" class="empty">读取失败：${escapeHtml(error.message)}</td></tr>`;
  }
}

async function rollbackOperationLog(logId) {
  if (!confirm("确认撤回这条操作记录？系统只会在没有后续相关改动时恢复备份。")) return;
  try {
    await fetchJson(`/api/admin/operation-logs/${encodeURIComponent(logId)}/rollback`, { method: "POST" });
    await loadOperationLogs();
    await loadAdminHealth();
    await loadAccounts();
  } catch (error) {
    alert(error.message);
  }
}

async function runTaskAction(taskId, action, reload) {
  try {
    await fetchJson(`/api/admin/tasks/${encodeURIComponent(taskId)}/${action}`, { method: "POST" });
  } catch (error) {
    alert(error.message);
  }
  reload();
}

async function reviewTask(taskId, action) {
  runTaskAction(taskId, action, loadReviews);
}

async function summaryReviewTask(taskId, action) {
  await runTaskAction(taskId, action, loadSummaryReviews);
  closeSummaryReviewDrawer();
}

function linesFromTextarea(textarea) {
  return textarea.value
    .split("\n")
    .map((line) => line.trim())
    .filter(Boolean);
}

function clearRegisterPreview(type, resetState = true) {
  const previewNode = {
    class_record: classRegisterPreview,
    payment: paymentRegisterPreview,
    course_summary: summaryRegisterPreview,
  }[type];
  const confirmButton = {
    class_record: classRegisterConfirm,
    payment: paymentRegisterConfirm,
    course_summary: summaryRegisterConfirm,
  }[type];
  if (resetState) registerPreviewState[type] = null;
  if (previewNode) {
    previewNode.hidden = true;
    previewNode.innerHTML = "";
  }
  if (confirmButton) confirmButton.hidden = true;
}

function renderRegisterPreview(type, data, statusNode) {
  const previewNode = {
    class_record: classRegisterPreview,
    payment: paymentRegisterPreview,
    course_summary: summaryRegisterPreview,
  }[type];
  const confirmButton = {
    class_record: classRegisterConfirm,
    payment: paymentRegisterConfirm,
    course_summary: summaryRegisterConfirm,
  }[type];
  previewNode.hidden = false;
  if (data.status === "ready") {
    const warning = data.warning ? `<p>${escapeHtml(data.warning)}</p>` : "";
    previewNode.innerHTML = `${warning}<strong>标准登记内容</strong><pre>${escapeHtml((data.standard_lines || []).join("\n\n"))}</pre>`;
    confirmButton.hidden = false;
    registerPreviewState[type] = {
      conversationId: data.conversation_id,
      standardLines: data.standard_lines || [],
    };
    statusNode.textContent = data.ai_used ? "模型已生成预览，请确认后写入" : "已通过本地标准格式校验，请确认后写入";
    return;
  }
  if (data.status === "needs_info") {
    const questions = (data.questions || []).map((item) => `<li>${escapeHtml(item)}</li>`).join("");
    previewNode.innerHTML = `<strong>需要补充信息</strong><ul>${questions}</ul><textarea data-ai-answer rows="3" placeholder="在这里补充缺失信息后再次生成预览"></textarea>`;
    confirmButton.hidden = true;
    registerPreviewState[type] = {
      conversationId: data.conversation_id,
      standardLines: [],
    };
    statusNode.textContent = "请补充信息后再次生成预览";
    return;
  }
  const questions = (data.questions || []).map((item) => `<li>${escapeHtml(item)}</li>`).join("");
  previewNode.innerHTML = `<strong>无法生成预览</strong>${questions ? `<ul>${questions}</ul>` : ""}`;
  confirmButton.hidden = true;
  registerPreviewState[type] = {
    conversationId: data.conversation_id,
    standardLines: [],
  };
  statusNode.textContent = `预览失败：${data.error || "请修改原文后重试"}`;
}

async function previewRegister(event, type, lines, statusNode) {
  event.preventDefault();
  if (!lines.length) {
    clearRegisterPreview(type);
    statusNode.textContent = "请先填写登记内容";
    return;
  }
  const previewNode = {
    class_record: classRegisterPreview,
    payment: paymentRegisterPreview,
    course_summary: summaryRegisterPreview,
  }[type];
  const answerNode = previewNode ? previewNode.querySelector("[data-ai-answer]") : null;
  const state = registerPreviewState[type] || {};
  const answers = answerNode && answerNode.value.trim() ? { followup: answerNode.value.trim() } : {};
  clearRegisterPreview(type, !state.conversationId);
  statusNode.textContent = "正在生成预览";
  try {
    const data = await fetchJson("/api/ai/register/preview", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        type,
        lines,
        answers,
        conversation_id: state.conversationId || null,
      }),
    });
    renderRegisterPreview(type, data, statusNode);
  } catch (error) {
    statusNode.textContent = `预览失败：${error.message}`;
  }
}

async function confirmRegister(type, statusNode, url, onSuccess) {
  const state = registerPreviewState[type];
  if (!state || !state.standardLines || !state.standardLines.length) {
    statusNode.textContent = "请先生成可确认的预览";
    return;
  }
  statusNode.textContent = "正在写入";
  try {
    const data = await fetchJson(url, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ lines: state.standardLines }),
    });
    if (type === "course_summary") {
      statusNode.textContent = `已接收 ${data.received} 条；自动登记 ${data.auto_registered} 条；重复 ${data.duplicates} 条；舍弃 ${data.rejected} 条`;
    } else {
      statusNode.textContent = `已登记 ${data.registered} 条；备份 ${data.backup_id}`;
    }
    clearRegisterPreview(type);
    onSuccess();
    await loadAdminHealth();
    await loadAccounts();
  } catch (error) {
    statusNode.textContent = `写入失败：${error.message}`;
  }
}

document.querySelectorAll("[data-admin-tab]").forEach((button) => {
  button.addEventListener("click", () => setActiveTab(button.dataset.adminTab));
});

accountForm.addEventListener("submit", (event) => {
  event.preventDefault();
  loadAccounts();
});
accountStatus.addEventListener("change", loadAccounts);
newAccountBtn.addEventListener("click", openNewAccountEditor);
cancelAccountEditBtn.addEventListener("click", () => {
  accountEditor.hidden = true;
});
accountEditForm.addEventListener("submit", saveAccount);
accountRows.addEventListener("click", (event) => {
  const button = event.target.closest(".account-edit");
  if (!button) return;
  openEditAccountEditor(button.dataset.studentId);
});
teacherForm.addEventListener("submit", (event) => {
  event.preventDefault();
  loadTeachers();
});
teacherStatus.addEventListener("change", loadTeachers);
newTeacherBtn.addEventListener("click", openNewTeacherEditor);
cancelTeacherEditBtn.addEventListener("click", () => {
  teacherEditor.hidden = true;
});
teacherEditForm.addEventListener("submit", saveTeacher);
teacherRows.addEventListener("click", (event) => {
  const button = event.target.closest(".teacher-edit");
  if (!button) return;
  openEditTeacherEditor(button.dataset.teacherId);
});
reviewStatus.addEventListener("change", loadReviews);
reviewRows.addEventListener("click", (event) => {
  const approve = event.target.closest(".review-approve");
  const reject = event.target.closest(".review-reject");
  if (approve) reviewTask(approve.dataset.taskId, "approve");
  if (reject) reviewTask(reject.dataset.taskId, "reject");
});
summaryReviewStatus.addEventListener("change", loadSummaryReviews);
summaryReviewRows.addEventListener("click", (event) => {
  const detail = event.target.closest(".summary-detail");
  const approve = event.target.closest(".summary-approve");
  const reject = event.target.closest(".summary-reject");
  if (detail) {
    openSummaryReviewDrawer(detail.dataset.taskId);
    return;
  }
  if (approve) {
    summaryReviewTask(approve.dataset.taskId, "approve");
    return;
  }
  if (reject) summaryReviewTask(reject.dataset.taskId, "reject");
});
summaryReviewDrawerClose.addEventListener("click", closeSummaryReviewDrawer);
summaryReviewDrawerBackdrop.addEventListener("click", (event) => {
  if (event.target === summaryReviewDrawerBackdrop) closeSummaryReviewDrawer();
});
summaryReviewDrawerApprove.addEventListener("click", () => {
  if (activeSummaryReview) summaryReviewTask(activeSummaryReview.id, "approve");
});
summaryReviewDrawerReject.addEventListener("click", () => {
  if (activeSummaryReview) summaryReviewTask(activeSummaryReview.id, "reject");
});
document.addEventListener("keydown", (event) => {
  if (event.key === "Escape" && !summaryReviewDrawerBackdrop.hidden) closeSummaryReviewDrawer();
});
summarySearchForm.addEventListener("submit", (event) => {
  event.preventDefault();
  loadSummarySearch();
});
summarySearchMissingTime.addEventListener("change", loadSummarySearch);
summarySearchRows.addEventListener("click", (event) => {
  const button = event.target.closest(".summary-toggle");
  const saveTime = event.target.closest(".summary-time-save");
  const deleteSummary = event.target.closest(".summary-delete");
  if (saveTime) {
    const input = summarySearchRows.querySelector(`[data-summary-time-input='${saveTime.dataset.summaryId}']`);
    const timeRange = input ? input.value.trim() : "";
    if (!timeRange) {
      alert("请输入时间段");
      return;
    }
    updateCourseSummaryTime(saveTime.dataset.summaryId, timeRange).catch((error) => alert(error.message));
    return;
  }
  if (deleteSummary) {
    if (!confirm("确认删除这条课程小结？")) return;
    deleteCourseSummary(deleteSummary.dataset.summaryId).catch((error) => alert(error.message));
    return;
  }
  if (!button) return;
  const target = document.getElementById(button.dataset.target);
  if (!target) return;
  target.hidden = !target.hidden;
  button.textContent = target.hidden ? "展开" : "收起";
});
logOperation.addEventListener("change", loadOperationLogs);
logStatus.addEventListener("change", loadOperationLogs);
logFilterForm.addEventListener("submit", (event) => {
  event.preventDefault();
  loadOperationLogs();
});
logRows.addEventListener("click", (event) => {
  const rollback = event.target.closest(".log-rollback");
  if (rollback) rollbackOperationLog(rollback.dataset.logId);
});
classRegisterForm.addEventListener("submit", (event) => {
  previewRegister(event, "class_record", linesFromTextarea(classRegisterLines), classRegisterStatus);
});
paymentRegisterForm.addEventListener("submit", (event) => {
  previewRegister(event, "payment", linesFromTextarea(paymentRegisterLines), paymentRegisterStatus);
});
classRegisterConfirm.addEventListener("click", () => {
  confirmRegister("class_record", classRegisterStatus, "/api/register/class-records", () => {
    classRegisterLines.value = "";
  });
});
paymentRegisterConfirm.addEventListener("click", () => {
  confirmRegister("payment", paymentRegisterStatus, "/api/register/payments", () => {
    paymentRegisterLines.value = "";
  });
});
summaryRegisterForm.addEventListener("submit", (event) => {
  previewRegister(event, "course_summary", linesFromTextarea(summaryRegisterText), summaryRegisterStatus);
});
summaryRegisterConfirm.addEventListener("click", () => {
  confirmRegister("course_summary", summaryRegisterStatus, "/api/register/course-summaries", () => {
    summaryRegisterText.value = "";
  });
});
refreshBtn.addEventListener("click", () => {
  loadAdminHealth();
  if (!panels.accounts.hidden) loadAccounts();
  if (!panels.reviews.hidden) loadReviews();
  if (!panels.summaries.hidden) loadSummaryReviews();
  if (!panels.summarySearch.hidden) loadSummarySearch();
  if (!panels.logs.hidden) loadOperationLogs();
});

loadAdminHealth();
addSummaryRegisterItem();
loadAccounts();