import { mkdir } from 'node:fs/promises';
import { dirname, join, resolve } from 'node:path';
import { mysqlSchema, sqliteSchema } from './src/database/schema.mjs';
import { createSqliteAdapter } from './src/database/sqlite-adapter.mjs';
import { createMysqlAdapter } from './src/database/mysql-adapter.mjs';

export const relationalTables = [
  'schema_metadata',
  'organization',
  'schools',
  'school_classes',
  'users',
  'candidate_profiles',
  'notices',
  'exams',
  'exam_subjects',
  'registrations',
  'registration_subjects',
  'admit_cards',
  'results',
  'test_centers',
  'test_rooms',
  'center_change_requests',
  'center_change_rooms',
  'number_rules',
  'number_rule_segments',
  'candidate_account_batches',
  'candidate_account_batch_items',
  'workflow_definitions',
  'workflow_steps',
  'workflow_instances',
  'workflow_actions',
  'audit_logs'
];

function validateState(state, source = '数据库') {
  const collections = [
    'schools', 'classes', 'users', 'candidateProfiles', 'notices', 'exams', 'registrations', 'results',
    'testCenters', 'testRooms', 'centerChangeRequests', 'centerChangeRooms',
    'numberRules', 'candidateAccountBatches', 'candidateAccountBatchItems',
    'workflows', 'workflowInstances', 'workflowActions', 'auditLogs'
  ];
  if (!state || typeof state !== 'object' || collections.some(name => !Array.isArray(state[name]))) {
    throw new Error(`${source}中的应用数据格式无效`);
  }
  return state;
}

function buildSeedOperations(state) {
  validateState(state);
  const operations = [];
  const add = (sql, ...params) => operations.push({ sql, params });
  const nullable = value => value == null || value === '' ? null : value;

  add(
    'UPDATE schema_metadata SET schema_version = 6, app_version = ?, self_registration_enabled = ?, created_at = ? WHERE id = 1',
    Number(state.meta?.version || 1), state.settings?.selfRegistrationEnabled ? 1 : 0,
    state.meta?.createdAt || new Date().toISOString()
  );
  add(
    'INSERT INTO organization (id, name, code, phone, address) VALUES (1, ?, ?, ?, ?)',
    state.organization?.name || '', state.organization?.code || '', state.organization?.phone || '', state.organization?.address || ''
  );

  for (const school of state.schools) {
    add(
      'INSERT INTO schools (id, name, code, address, active) VALUES (?, ?, ?, ?, ?)',
      school.id, school.name, school.code, nullable(school.address), school.active === false ? 0 : 1
    );
  }

  for (const schoolClass of state.classes) {
    add(
      'INSERT INTO school_classes (id, school_id, name, grade, active) VALUES (?, ?, ?, ?, ?)',
      schoolClass.id, schoolClass.schoolId, schoolClass.name, schoolClass.grade, schoolClass.active === false ? 0 : 1
    );
  }

  for (const user of state.users) {
    add(
      `INSERT INTO users (
        id, username, candidate_number, password_hash, role, admin_level, school_id, class_id, active,
        must_change_password, display_name, created_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      user.id, user.username, nullable(user.candidateNumber), user.passwordHash, user.role, nullable(user.adminLevel), nullable(user.schoolId),
      nullable(user.classId), user.active === false ? 0 : 1, user.mustChangePassword ? 1 : 0, user.displayName, user.createdAt
    );
  }

  for (const profile of state.candidateProfiles) {
    add(
      `INSERT INTO candidate_profiles (
        id, user_id, name, gender, id_number, phone, email, school, grade, school_id, class_id, address,
        emergency_contact, emergency_phone, native_place, birth_date, ethnicity, postal_code, guardian_name,
        guardian_phone, profile_completed, status, review_note, reviewed_at, reviewer_id, updated_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      profile.id, profile.userId, profile.name, nullable(profile.gender), profile.idNumber, profile.phone,
      nullable(profile.email), nullable(profile.school), nullable(profile.grade), nullable(profile.schoolId),
      nullable(profile.classId), nullable(profile.address),
      nullable(profile.emergencyContact), nullable(profile.emergencyPhone), nullable(profile.nativePlace), nullable(profile.birthDate),
      nullable(profile.ethnicity), nullable(profile.postalCode), nullable(profile.guardianName), nullable(profile.guardianPhone),
      profile.profileCompleted ? 1 : 0, profile.status, nullable(profile.reviewNote),
      nullable(profile.reviewedAt), nullable(profile.reviewerId), profile.updatedAt
    );
  }

  for (const notice of state.notices) {
    add(
      `INSERT INTO notices (
        id, title, summary, content, category, pinned, status, publish_at, created_at, author
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      notice.id, notice.title, notice.summary, notice.content, notice.category, notice.pinned ? 1 : 0,
      notice.status, nullable(notice.publishAt), nullable(notice.createdAt), notice.author
    );
  }

  for (const exam of state.exams) {
    add(
      `INSERT INTO exams (
        id, code, name, description, registration_start, registration_end, exam_start, exam_end,
        admit_download_start, admit_download_end, location, pass_policy, pass_value, status, created_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      exam.id, exam.code, exam.name, exam.description || '', exam.registrationStart, exam.registrationEnd,
      exam.examStart, exam.examEnd, exam.admitDownloadStart, exam.admitDownloadEnd, exam.location || '',
      exam.passPolicy || 'score_ratio', Number(exam.passValue ?? 60), exam.status, exam.createdAt
    );
    exam.subjects.forEach((subject, index) => add(
      `INSERT INTO exam_subjects (
        id, exam_id, name, subject_date, start_time, end_time, fee, full_score, pass_score, position
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      subject.id, exam.id, subject.name, subject.date || String(exam.examStart).slice(0, 10),
      subject.start || '', subject.end || '', Number(subject.fee || 0), Number(subject.fullScore || 150),
      Number(subject.passScore ?? Number(subject.fullScore || 150) * .6), Number(subject.order || index + 1)
    ));
  }

  for (const registration of state.registrations) {
    add(
      `INSERT INTO registrations (
        id, user_id, exam_id, status, payment_status, created_at, reviewed_at, review_note,
        registration_number, number_rule_id
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      registration.id, registration.userId, registration.examId, registration.status,
      registration.paymentStatus, registration.createdAt, nullable(registration.reviewedAt), nullable(registration.reviewNote),
      nullable(registration.registrationNumber), nullable(registration.numberRuleId)
    );
    for (const subjectId of registration.subjectIds) {
      add('INSERT INTO registration_subjects (registration_id, subject_id) VALUES (?, ?)', registration.id, subjectId);
    }
    if (registration.admitCard) {
      add(
        `INSERT INTO admit_cards (
          registration_id, card_number, test_center, room, seat, generated_at
        ) VALUES (?, ?, ?, ?, ?, ?)`,
        registration.id, registration.admitCard.number, registration.admitCard.testCenter,
        registration.admitCard.room, registration.admitCard.seat, registration.admitCard.generatedAt
      );
    }
  }

  for (const result of state.results) {
    add(
      `INSERT INTO results (
        id, registration_id, subject_id, score, grade, published, updated_at, published_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
      result.id, result.registrationId, result.subjectId, Number(result.score), result.grade,
      result.published ? 1 : 0, nullable(result.updatedAt), nullable(result.publishedAt)
    );
  }

  for (const center of state.testCenters) {
    add(
      `INSERT INTO test_centers (
        id, school_id, code, name, address, contact, manager_name, manager_phone, emergency_phone,
        gate_open_time, transport, status, notes, rooms, updated_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      center.id, center.schoolId, center.code, center.name, center.address, nullable(center.contact),
      nullable(center.managerName), nullable(center.managerPhone), nullable(center.emergencyPhone),
      nullable(center.gateOpenTime), nullable(center.transport), center.status || 'active', nullable(center.notes),
      center.rooms || '', center.updatedAt
    );
  }

  for (const room of state.testRooms) {
    add(
      `INSERT INTO test_rooms (
        id, center_id, code, name, building, floor, capacity, seat_plan, seat_start, seat_end, room_type, status, notes
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      room.id, room.centerId, room.code, room.name, room.building, nullable(room.floor), Number(room.capacity),
      nullable(room.seatPlan), Number(room.seatStart || 1), Number(room.seatEnd || room.capacity), room.roomType, room.status || 'active', nullable(room.notes)
    );
  }

  for (const request of state.centerChangeRequests) {
    add(
      `INSERT INTO center_change_requests (
        id, center_id, school_id, request_type, code, name, address, contact, manager_name, manager_phone,
        emergency_phone, gate_open_time, transport, center_status, notes, status, review_note,
        requested_by, created_at, reviewed_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      request.id, nullable(request.centerId), request.schoolId, request.requestType, request.code, request.name,
      request.address, nullable(request.contact), nullable(request.managerName), nullable(request.managerPhone),
      nullable(request.emergencyPhone), nullable(request.gateOpenTime), nullable(request.transport),
      request.centerStatus || 'active', nullable(request.notes), request.status, nullable(request.reviewNote),
      nullable(request.requestedBy), request.createdAt, nullable(request.reviewedAt)
    );
  }

  for (const room of state.centerChangeRooms) {
    add(
      `INSERT INTO center_change_rooms (
        id, request_id, room_id, code, name, building, floor, capacity, seat_plan, seat_start, seat_end, room_type, status, notes
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      room.id, room.requestId, nullable(room.roomId), room.code, room.name, room.building, nullable(room.floor),
      Number(room.capacity), nullable(room.seatPlan), Number(room.seatStart || 1), Number(room.seatEnd || room.capacity), room.roomType,
      room.status || 'active', nullable(room.notes)
    );
  }

  for (const rule of state.numberRules) {
    add(
      'INSERT INTO number_rules (id, name, separator, active, created_by, updated_at) VALUES (?, ?, ?, ?, ?, ?)',
      rule.id, rule.name, rule.separator || '', rule.active ? 1 : 0, nullable(rule.createdBy), rule.updatedAt
    );
    rule.segments.forEach((segment, index) => add(
      'INSERT INTO number_rule_segments (id, rule_id, position, type, value, width) VALUES (?, ?, ?, ?, ?, ?)',
      segment.id, rule.id, Number(segment.position || index + 1), segment.type, nullable(segment.value), Number(segment.width || 0)
    ));
  }

  for (const batch of state.candidateAccountBatches) {
    add(
      `INSERT INTO candidate_account_batches (
        id, school_id, requested_by, status, review_note, created_at, reviewed_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?)`,
      batch.id, batch.schoolId, nullable(batch.requestedBy), batch.status, nullable(batch.reviewNote),
      batch.createdAt, nullable(batch.reviewedAt)
    );
  }

  for (const item of state.candidateAccountBatchItems) {
    add(
      `INSERT INTO candidate_account_batch_items (
        id, batch_id, class_id, position, candidate_number, initial_password, user_id, created_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
      item.id, item.batchId, item.classId, Number(item.position), nullable(item.candidateNumber),
      nullable(item.initialPassword), nullable(item.userId), nullable(item.createdAt)
    );
  }

  for (const workflow of state.workflows) {
    add(
      `INSERT INTO workflow_definitions (
        id, business_type, name, active, updated_by, updated_at
      ) VALUES (?, ?, ?, ?, ?, ?)`,
      workflow.id, workflow.businessType, workflow.name, workflow.active === false ? 0 : 1,
      nullable(workflow.updatedBy), workflow.updatedAt
    );
    workflow.steps.forEach((step, index) => add(
      `INSERT INTO workflow_steps (
        id, workflow_id, position, name, admin_level
      ) VALUES (?, ?, ?, ?, ?)`,
      step.id, workflow.id, Number(step.position || index + 1), step.name, step.adminLevel
    ));
  }

  for (const instance of state.workflowInstances) {
    add(
      `INSERT INTO workflow_instances (
        id, workflow_id, business_type, business_id, status, current_step, assignee_id, created_at, completed_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      instance.id, instance.workflowId, instance.businessType, instance.businessId, instance.status,
      Number(instance.currentStep || 1), nullable(instance.assigneeId), instance.createdAt, nullable(instance.completedAt)
    );
  }

  for (const action of state.workflowActions) {
    add(
      `INSERT INTO workflow_actions (
        id, instance_id, actor_id, action, note, from_assignee_id, to_assignee_id, created_at
      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
      action.id, action.instanceId, nullable(action.actorId), action.action, nullable(action.note),
      nullable(action.fromAssigneeId), nullable(action.toAssigneeId), action.createdAt
    );
  }

  for (const log of state.auditLogs) {
    add(
      'INSERT INTO audit_logs (id, actor_id, action, detail, created_at) VALUES (?, ?, ?, ?, ?)',
      log.id, nullable(log.actorId), log.action, log.detail, log.createdAt
    );
  }

  return operations;
}

function stateFromRows(rows) {
  const subjectsByExam = new Map();
  for (const row of rows.subjects) {
    const subject = {
      id: row.id,
      name: row.name,
      date: row.subject_date,
      start: row.start_time,
      end: row.end_time,
      fee: Number(row.fee),
      fullScore: Number(row.full_score ?? 150),
      passScore: Number(row.pass_score ?? 90),
      order: Number(row.position)
    };
    const subjects = subjectsByExam.get(row.exam_id) || [];
    subjects.push(subject);
    subjectsByExam.set(row.exam_id, subjects);
  }

  const registrationSubjects = new Map();
  for (const row of rows.registrationSubjects) {
    const subjectIds = registrationSubjects.get(row.registration_id) || [];
    subjectIds.push(row.subject_id);
    registrationSubjects.set(row.registration_id, subjectIds);
  }
  const admitCards = new Map(rows.admitCards.map(row => [row.registration_id, {
    number: row.card_number,
    testCenter: row.test_center,
    room: row.room,
    seat: row.seat,
    generatedAt: row.generated_at
  }]));
  const ruleSegments = new Map();
  for (const row of rows.numberRuleSegments) {
    const segments = ruleSegments.get(row.rule_id) || [];
    segments.push({
      id: row.id,
      type: row.type,
      value: row.value || '',
      width: Number(row.width || 0),
      position: Number(row.position)
    });
    ruleSegments.set(row.rule_id, segments);
  }
  const workflowSteps = new Map();
  for (const row of rows.workflowSteps) {
    const steps = workflowSteps.get(row.workflow_id) || [];
    steps.push({
      id: row.id,
      name: row.name,
      adminLevel: row.admin_level,
      position: Number(row.position)
    });
    workflowSteps.set(row.workflow_id, steps);
  }

  const organization = rows.organization;
  const state = {
    meta: { version: Number(rows.system.app_version), createdAt: rows.system.created_at },
    settings: { selfRegistrationEnabled: Boolean(rows.system.self_registration_enabled) },
    organization: {
      name: organization.name,
      code: organization.code,
      phone: organization.phone,
      address: organization.address
    },
    schools: rows.schools.map(row => ({
      id: row.id,
      name: row.name,
      code: row.code,
      address: row.address || '',
      active: Boolean(row.active)
    })),
    classes: rows.classes.map(row => ({
      id: row.id,
      schoolId: row.school_id,
      name: row.name,
      grade: row.grade,
      active: Boolean(row.active)
    })),
    users: rows.users.map(row => ({
      id: row.id,
      username: row.username,
      candidateNumber: row.candidate_number || '',
      passwordHash: row.password_hash,
      role: row.role,
      adminLevel: row.admin_level || (row.role === 'admin' ? 'super' : null),
      schoolId: row.school_id || null,
      classId: row.class_id || null,
      active: row.active == null ? true : Boolean(row.active),
      mustChangePassword: Boolean(row.must_change_password),
      displayName: row.display_name,
      createdAt: row.created_at
    })),
    candidateProfiles: rows.profiles.map(row => ({
      id: row.id,
      userId: row.user_id,
      name: row.name,
      gender: row.gender || '',
      idNumber: row.id_number,
      phone: row.phone,
      email: row.email || '',
      school: row.school || '',
      grade: row.grade || '',
      schoolId: row.school_id || null,
      classId: row.class_id || null,
      address: row.address || '',
      emergencyContact: row.emergency_contact || '',
      emergencyPhone: row.emergency_phone || '',
      nativePlace: row.native_place || '',
      birthDate: row.birth_date || '',
      ethnicity: row.ethnicity || '',
      postalCode: row.postal_code || '',
      guardianName: row.guardian_name || '',
      guardianPhone: row.guardian_phone || '',
      profileCompleted: Boolean(row.profile_completed),
      status: row.status,
      reviewNote: row.review_note || '',
      reviewedAt: row.reviewed_at,
      reviewerId: row.reviewer_id,
      updatedAt: row.updated_at
    })),
    notices: rows.notices.map(row => ({
      id: row.id,
      title: row.title,
      summary: row.summary,
      content: row.content,
      category: row.category,
      pinned: Boolean(row.pinned),
      status: row.status,
      publishAt: row.publish_at,
      createdAt: row.created_at,
      author: row.author
    })),
    exams: rows.exams.map(row => ({
      id: row.id,
      code: row.code,
      name: row.name,
      description: row.description,
      registrationStart: row.registration_start,
      registrationEnd: row.registration_end,
      examStart: row.exam_start,
      examEnd: row.exam_end,
      admitDownloadStart: row.admit_download_start,
      admitDownloadEnd: row.admit_download_end,
      location: row.location,
      passPolicy: row.pass_policy || 'score_ratio',
      passValue: Number(row.pass_value ?? 60),
      status: row.status,
      createdAt: row.created_at,
      subjects: subjectsByExam.get(row.id) || []
    })),
    registrations: rows.registrations.map(row => ({
      id: row.id,
      userId: row.user_id,
      examId: row.exam_id,
      subjectIds: registrationSubjects.get(row.id) || [],
      status: row.status,
      paymentStatus: row.payment_status,
      createdAt: row.created_at,
      reviewedAt: row.reviewed_at,
      reviewNote: row.review_note || '',
      registrationNumber: row.registration_number || '',
      numberRuleId: row.number_rule_id || null,
      admitCard: admitCards.get(row.id) || null
    })),
    results: rows.results.map(row => ({
      id: row.id,
      registrationId: row.registration_id,
      subjectId: row.subject_id,
      score: Number(row.score),
      grade: row.grade,
      published: Boolean(row.published),
      updatedAt: row.updated_at,
      publishedAt: row.published_at
    })),
    testCenters: rows.testCenters.map(row => ({
      id: row.id,
      schoolId: row.school_id,
      code: row.code || '',
      name: row.name,
      address: row.address,
      contact: row.contact || '',
      managerName: row.manager_name || '',
      managerPhone: row.manager_phone || '',
      emergencyPhone: row.emergency_phone || '',
      gateOpenTime: row.gate_open_time || '',
      transport: row.transport || '',
      status: row.status || 'active',
      notes: row.notes || '',
      rooms: row.rooms || '',
      updatedAt: row.updated_at
    })),
    testRooms: rows.testRooms.map(row => ({
      id: row.id,
      centerId: row.center_id,
      code: row.code,
      name: row.name,
      building: row.building,
      floor: row.floor || '',
      capacity: Number(row.capacity),
      seatPlan: row.seat_plan || '',
      seatStart: Number(row.seat_start),
      seatEnd: Number(row.seat_end),
      roomType: row.room_type,
      status: row.status,
      notes: row.notes || ''
    })),
    centerChangeRequests: rows.centerChangeRequests.map(row => ({
      id: row.id,
      centerId: row.center_id,
      schoolId: row.school_id,
      requestType: row.request_type,
      code: row.code,
      name: row.name,
      address: row.address,
      contact: row.contact || '',
      managerName: row.manager_name || '',
      managerPhone: row.manager_phone || '',
      emergencyPhone: row.emergency_phone || '',
      gateOpenTime: row.gate_open_time || '',
      transport: row.transport || '',
      centerStatus: row.center_status,
      notes: row.notes || '',
      status: row.status,
      reviewNote: row.review_note || '',
      requestedBy: row.requested_by,
      createdAt: row.created_at,
      reviewedAt: row.reviewed_at
    })),
    centerChangeRooms: rows.centerChangeRooms.map(row => ({
      id: row.id,
      requestId: row.request_id,
      roomId: row.room_id,
      code: row.code,
      name: row.name,
      building: row.building,
      floor: row.floor || '',
      capacity: Number(row.capacity),
      seatPlan: row.seat_plan || '',
      seatStart: Number(row.seat_start),
      seatEnd: Number(row.seat_end),
      roomType: row.room_type,
      status: row.status,
      notes: row.notes || ''
    })),
    numberRules: rows.numberRules.map(row => ({
      id: row.id,
      name: row.name,
      separator: row.separator,
      active: Boolean(row.active),
      createdBy: row.created_by,
      updatedAt: row.updated_at,
      segments: ruleSegments.get(row.id) || []
    })),
    candidateAccountBatches: rows.candidateAccountBatches.map(row => ({
      id: row.id,
      schoolId: row.school_id,
      requestedBy: row.requested_by,
      status: row.status,
      reviewNote: row.review_note || '',
      createdAt: row.created_at,
      reviewedAt: row.reviewed_at
    })),
    candidateAccountBatchItems: rows.candidateAccountBatchItems.map(row => ({
      id: row.id,
      batchId: row.batch_id,
      classId: row.class_id,
      position: Number(row.position),
      candidateNumber: row.candidate_number || '',
      initialPassword: row.initial_password || '',
      userId: row.user_id,
      createdAt: row.created_at
    })),
    workflows: rows.workflows.map(row => ({
      id: row.id,
      businessType: row.business_type,
      name: row.name,
      active: Boolean(row.active),
      updatedBy: row.updated_by,
      updatedAt: row.updated_at,
      steps: workflowSteps.get(row.id) || []
    })),
    workflowInstances: rows.workflowInstances.map(row => ({
      id: row.id,
      workflowId: row.workflow_id,
      businessType: row.business_type,
      businessId: row.business_id,
      status: row.status,
      currentStep: Number(row.current_step),
      assigneeId: row.assignee_id,
      createdAt: row.created_at,
      completedAt: row.completed_at
    })),
    workflowActions: rows.workflowActions.map(row => ({
      id: row.id,
      instanceId: row.instance_id,
      actorId: row.actor_id,
      action: row.action,
      note: row.note || '',
      fromAssigneeId: row.from_assignee_id,
      toAssigneeId: row.to_assignee_id,
      createdAt: row.created_at
    })),
    auditLogs: rows.auditLogs.map(row => ({
      id: row.id,
      actorId: row.actor_id,
      action: row.action,
      detail: row.detail,
      createdAt: row.created_at
    }))
  };
  return state;
}

function readSqliteRows(connection) {
  return {
    system: connection.prepare('SELECT * FROM schema_metadata WHERE id = 1').get(),
    organization: connection.prepare('SELECT * FROM organization WHERE id = 1').get(),
    schools: connection.prepare('SELECT * FROM schools ORDER BY name, id').all(),
    classes: connection.prepare('SELECT * FROM school_classes ORDER BY school_id, grade, name, id').all(),
    users: connection.prepare('SELECT * FROM users ORDER BY created_at, id').all(),
    profiles: connection.prepare('SELECT * FROM candidate_profiles ORDER BY updated_at, id').all(),
    notices: connection.prepare('SELECT * FROM notices ORDER BY publish_at, created_at, id').all(),
    exams: connection.prepare('SELECT * FROM exams ORDER BY created_at, id').all(),
    subjects: connection.prepare('SELECT * FROM exam_subjects ORDER BY exam_id, position, id').all(),
    registrations: connection.prepare('SELECT * FROM registrations ORDER BY created_at, id').all(),
    registrationSubjects: connection.prepare('SELECT * FROM registration_subjects ORDER BY registration_id, subject_id').all(),
    admitCards: connection.prepare('SELECT * FROM admit_cards ORDER BY registration_id').all(),
    results: connection.prepare('SELECT * FROM results ORDER BY id').all(),
    testCenters: connection.prepare('SELECT * FROM test_centers ORDER BY school_id, name, id').all(),
    testRooms: connection.prepare('SELECT * FROM test_rooms ORDER BY center_id, code, id').all(),
    centerChangeRequests: connection.prepare('SELECT * FROM center_change_requests ORDER BY created_at DESC, id').all(),
    centerChangeRooms: connection.prepare('SELECT * FROM center_change_rooms ORDER BY request_id, code, id').all(),
    numberRules: connection.prepare('SELECT * FROM number_rules ORDER BY updated_at DESC, id').all(),
    numberRuleSegments: connection.prepare('SELECT * FROM number_rule_segments ORDER BY rule_id, position, id').all(),
    candidateAccountBatches: connection.prepare('SELECT * FROM candidate_account_batches ORDER BY created_at DESC, id').all(),
    candidateAccountBatchItems: connection.prepare('SELECT * FROM candidate_account_batch_items ORDER BY batch_id, position, id').all(),
    workflows: connection.prepare('SELECT * FROM workflow_definitions ORDER BY business_type, id').all(),
    workflowSteps: connection.prepare('SELECT * FROM workflow_steps ORDER BY workflow_id, position, id').all(),
    workflowInstances: connection.prepare('SELECT * FROM workflow_instances ORDER BY created_at DESC, id').all(),
    workflowActions: connection.prepare('SELECT * FROM workflow_actions ORDER BY created_at, id').all(),
    auditLogs: connection.prepare('SELECT * FROM audit_logs ORDER BY created_at DESC, id DESC').all()
  };
}

async function readMysqlRows(connection) {
  const query = async sql => (await connection.execute(sql))[0];
  const one = async sql => (await query(sql))[0];
  return {
    system: await one('SELECT * FROM schema_metadata WHERE id = 1'),
    organization: await one('SELECT * FROM organization WHERE id = 1'),
    schools: await query('SELECT * FROM schools ORDER BY name, id'),
    classes: await query('SELECT * FROM school_classes ORDER BY school_id, grade, name, id'),
    users: await query('SELECT * FROM users ORDER BY created_at, id'),
    profiles: await query('SELECT * FROM candidate_profiles ORDER BY updated_at, id'),
    notices: await query('SELECT * FROM notices ORDER BY publish_at, created_at, id'),
    exams: await query('SELECT * FROM exams ORDER BY created_at, id'),
    subjects: await query('SELECT * FROM exam_subjects ORDER BY exam_id, position, id'),
    registrations: await query('SELECT * FROM registrations ORDER BY created_at, id'),
    registrationSubjects: await query('SELECT * FROM registration_subjects ORDER BY registration_id, subject_id'),
    admitCards: await query('SELECT * FROM admit_cards ORDER BY registration_id'),
    results: await query('SELECT * FROM results ORDER BY id'),
    testCenters: await query('SELECT * FROM test_centers ORDER BY school_id, name, id'),
    testRooms: await query('SELECT * FROM test_rooms ORDER BY center_id, code, id'),
    centerChangeRequests: await query('SELECT * FROM center_change_requests ORDER BY created_at DESC, id'),
    centerChangeRooms: await query('SELECT * FROM center_change_rooms ORDER BY request_id, code, id'),
    numberRules: await query('SELECT * FROM number_rules ORDER BY updated_at DESC, id'),
    numberRuleSegments: await query('SELECT * FROM number_rule_segments ORDER BY rule_id, position, id'),
    candidateAccountBatches: await query('SELECT * FROM candidate_account_batches ORDER BY created_at DESC, id'),
    candidateAccountBatchItems: await query('SELECT * FROM candidate_account_batch_items ORDER BY batch_id, position, id'),
    workflows: await query('SELECT * FROM workflow_definitions ORDER BY business_type, id'),
    workflowSteps: await query('SELECT * FROM workflow_steps ORDER BY workflow_id, position, id'),
    workflowInstances: await query('SELECT * FROM workflow_instances ORDER BY created_at DESC, id'),
    workflowActions: await query('SELECT * FROM workflow_actions ORDER BY created_at, id'),
    auditLogs: await query('SELECT * FROM audit_logs ORDER BY created_at DESC, id DESC')
  };
}

function operation(sql, ...params) {
  return { sql, params };
}

function optional(value) {
  return value == null || value === '' ? null : value;
}

function auditOperation(log) {
  return operation(
    'INSERT INTO audit_logs (id, actor_id, action, detail, created_at) VALUES (?, ?, ?, ?, ?)',
    log.id, optional(log.actorId), log.action, log.detail, log.createdAt
  );
}

function workflowInstanceOperation(instance) {
  return operation(
    `INSERT INTO workflow_instances (
      id, workflow_id, business_type, business_id, status, current_step, assignee_id, created_at, completed_at
    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
    instance.id, instance.workflowId, instance.businessType, instance.businessId, instance.status,
    Number(instance.currentStep || 1), optional(instance.assigneeId), instance.createdAt, optional(instance.completedAt)
  );
}

function workflowActionOperation(action) {
  return operation(
    `INSERT INTO workflow_actions (
      id, instance_id, actor_id, action, note, from_assignee_id, to_assignee_id, created_at
    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
    action.id, action.instanceId, optional(action.actorId), action.action, optional(action.note),
    optional(action.fromAssigneeId), optional(action.toAssigneeId), action.createdAt
  );
}

function workflowCreateOperations(instance, action) {
  return [workflowInstanceOperation(instance), workflowActionOperation(action)];
}

function createRepository({ client, location, read, transaction, close }) {
  return {
    client,
    location,
    read,
    close,
    async createCandidate(user, profile, instance, action, log = null) {
      const operations = [
        operation(
          `INSERT INTO users (
            id, username, candidate_number, password_hash, role, admin_level, school_id, class_id, active,
            must_change_password, display_name, created_at
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
          user.id, user.username, optional(user.candidateNumber), user.passwordHash, user.role, optional(user.adminLevel), optional(user.schoolId),
          optional(user.classId), user.active === false ? 0 : 1, user.mustChangePassword ? 1 : 0, user.displayName, user.createdAt
        ),
        operation(
          `INSERT INTO candidate_profiles (
            id, user_id, name, gender, id_number, phone, email, school, grade, school_id, class_id, address,
            emergency_contact, emergency_phone, native_place, birth_date, ethnicity, postal_code, guardian_name,
            guardian_phone, profile_completed, status, review_note, reviewed_at, reviewer_id, updated_at
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
          profile.id, profile.userId, profile.name, optional(profile.gender), profile.idNumber, profile.phone,
          optional(profile.email), optional(profile.school), optional(profile.grade), optional(profile.schoolId),
          optional(profile.classId), optional(profile.address),
          optional(profile.emergencyContact), optional(profile.emergencyPhone), optional(profile.nativePlace), optional(profile.birthDate),
          optional(profile.ethnicity), optional(profile.postalCode), optional(profile.guardianName), optional(profile.guardianPhone),
          profile.profileCompleted ? 1 : 0, profile.status, optional(profile.reviewNote),
          optional(profile.reviewedAt), optional(profile.reviewerId), profile.updatedAt
        )
      ];
      if (instance && action) operations.push(...workflowCreateOperations(instance, action));
      if (log) operations.push(auditOperation(log));
      await transaction(operations);
    },
    async createCandidateAccountBatch(batch, items, instance, action, log) {
      const operations = [
        operation(
          `INSERT INTO candidate_account_batches (
            id, school_id, requested_by, status, review_note, created_at, reviewed_at
          ) VALUES (?, ?, ?, ?, ?, ?, ?)`,
          batch.id, batch.schoolId, optional(batch.requestedBy), batch.status, optional(batch.reviewNote),
          batch.createdAt, optional(batch.reviewedAt)
        )
      ];
      for (const item of items) operations.push(operation(
        `INSERT INTO candidate_account_batch_items (
          id, batch_id, class_id, position, candidate_number, initial_password, user_id, created_at
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
        item.id, item.batchId, item.classId, Number(item.position), optional(item.candidateNumber),
        optional(item.initialPassword), optional(item.userId), optional(item.createdAt)
      ));
      operations.push(...workflowCreateOperations(instance, action), auditOperation(log));
      await transaction(operations);
    },
    async updateCandidateProfile(profile, displayName, instance, action) {
      const operations = [
        operation(
          `UPDATE candidate_profiles SET
            name = ?, gender = ?, id_number = ?, phone = ?, email = ?, school = ?, grade = ?, address = ?,
            school_id = ?, class_id = ?, emergency_contact = ?, emergency_phone = ?, status = ?, review_note = ?,
            native_place = ?, birth_date = ?, ethnicity = ?, postal_code = ?, guardian_name = ?, guardian_phone = ?,
            profile_completed = ?, reviewed_at = ?, reviewer_id = ?, updated_at = ?
          WHERE id = ?`,
          profile.name, optional(profile.gender), profile.idNumber, profile.phone, optional(profile.email),
          optional(profile.school), optional(profile.grade), optional(profile.address), optional(profile.schoolId),
          optional(profile.classId), optional(profile.emergencyContact), optional(profile.emergencyPhone), profile.status,
          optional(profile.reviewNote), optional(profile.nativePlace), optional(profile.birthDate), optional(profile.ethnicity),
          optional(profile.postalCode), optional(profile.guardianName), optional(profile.guardianPhone), profile.profileCompleted ? 1 : 0, optional(profile.reviewedAt),
          optional(profile.reviewerId), profile.updatedAt, profile.id
        ),
        operation('UPDATE users SET display_name = ? WHERE id = ?', displayName, profile.userId)
      ];
      if (instance && action) operations.push(...workflowCreateOperations(instance, action));
      await transaction(operations);
    },
    async changePassword(user, log) {
      const operations = [operation(
        'UPDATE users SET password_hash = ?, must_change_password = ? WHERE id = ?',
        user.passwordHash, user.mustChangePassword ? 1 : 0, user.id
      )];
      if (log) operations.push(auditOperation(log));
      await transaction(operations);
    },
    async updateRegistrationSetting(enabled, log) {
      await transaction([
        operation('UPDATE schema_metadata SET self_registration_enabled = ? WHERE id = 1', enabled ? 1 : 0),
        auditOperation(log)
      ]);
    },
    async createRegistration(registration, instance, action) {
      const operations = [operation(
        `INSERT INTO registrations (
          id, user_id, exam_id, status, payment_status, created_at, reviewed_at, review_note,
          registration_number, number_rule_id
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
        registration.id, registration.userId, registration.examId, registration.status,
        registration.paymentStatus, registration.createdAt, optional(registration.reviewedAt), optional(registration.reviewNote),
        optional(registration.registrationNumber), optional(registration.numberRuleId)
      )];
      for (const subjectId of registration.subjectIds) {
        operations.push(operation(
          'INSERT INTO registration_subjects (registration_id, subject_id) VALUES (?, ?)',
          registration.id, subjectId
        ));
      }
      if (instance && action) operations.push(...workflowCreateOperations(instance, action));
      await transaction(operations);
    },
    async reviewCandidate(profile, log) {
      await transaction([
        operation(
          `UPDATE candidate_profiles SET status = ?, review_note = ?, reviewed_at = ?, reviewer_id = ? WHERE id = ?`,
          profile.status, optional(profile.reviewNote), profile.reviewedAt, profile.reviewerId, profile.id
        ),
        auditOperation(log)
      ]);
    },
    async reviewRegistration(registration, log) {
      await transaction([
        operation(
          `UPDATE registrations SET status = ?, payment_status = ?, reviewed_at = ?, review_note = ? WHERE id = ?`,
          registration.status, registration.paymentStatus, registration.reviewedAt,
          optional(registration.reviewNote), registration.id
        ),
        auditOperation(log)
      ]);
    },
    async processWorkflow(instance, action, business, log) {
      const operations = [
        operation(
          `UPDATE workflow_instances SET
            status = ?, current_step = ?, assignee_id = ?, completed_at = ? WHERE id = ?`,
          instance.status, Number(instance.currentStep), optional(instance.assigneeId),
          optional(instance.completedAt), instance.id
        ),
        workflowActionOperation(action)
      ];
      if (instance.businessType === 'profile_change') {
        operations.push(operation(
          `UPDATE candidate_profiles SET
            status = ?, review_note = ?, reviewed_at = ?, reviewer_id = ? WHERE id = ?`,
          business.status, optional(business.reviewNote), optional(business.reviewedAt),
          optional(business.reviewerId), business.id
        ));
      } else if (instance.businessType === 'registration_review') {
        operations.push(operation(
          `UPDATE registrations SET
            status = ?, payment_status = ?, reviewed_at = ?, review_note = ?,
            registration_number = ?, number_rule_id = ? WHERE id = ?`,
          business.status, business.paymentStatus, optional(business.reviewedAt), optional(business.reviewNote),
          optional(business.registrationNumber), optional(business.numberRuleId), business.id
        ));
      } else if (instance.businessType === 'center_change') {
        operations.push(operation(
          `UPDATE center_change_requests SET
            status = ?, review_note = ?, reviewed_at = ? WHERE id = ?`,
          business.status, optional(business.reviewNote), optional(business.reviewedAt), business.id
        ));
      } else if (instance.businessType === 'candidate_account_batch') {
        operations.push(operation(
          `UPDATE candidate_account_batches SET
            status = ?, review_note = ?, reviewed_at = ? WHERE id = ?`,
          business.status, optional(business.reviewNote), optional(business.reviewedAt), business.id
        ));
      }
      if (log) operations.push(auditOperation(log));
      await transaction(operations);
    },
    async completeCandidateAccountBatch(batch, items, users, profiles, instance, action, log) {
      const operations = [
        operation(
          `UPDATE workflow_instances SET
            status = ?, current_step = ?, assignee_id = ?, completed_at = ? WHERE id = ?`,
          instance.status, Number(instance.currentStep), optional(instance.assigneeId), optional(instance.completedAt), instance.id
        ),
        workflowActionOperation(action),
        operation(
          `UPDATE candidate_account_batches SET status = ?, review_note = ?, reviewed_at = ? WHERE id = ?`,
          batch.status, optional(batch.reviewNote), optional(batch.reviewedAt), batch.id
        )
      ];
      for (let index = 0; index < users.length; index += 1) {
        const user = users[index];
        const profile = profiles[index];
        const item = items[index];
        operations.push(
          operation(
            `INSERT INTO users (
              id, username, candidate_number, password_hash, role, admin_level, school_id, class_id, active,
              must_change_password, display_name, created_at
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
            user.id, user.username, user.candidateNumber, user.passwordHash, user.role, optional(user.adminLevel),
            user.schoolId, user.classId, 1, 1, user.displayName, user.createdAt
          ),
          operation(
            `INSERT INTO candidate_profiles (
              id, user_id, name, gender, id_number, phone, email, school, grade, school_id, class_id, address,
              emergency_contact, emergency_phone, native_place, birth_date, ethnicity, postal_code, guardian_name,
              guardian_phone, profile_completed, status, review_note, reviewed_at, reviewer_id, updated_at
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
            profile.id, profile.userId, profile.name, optional(profile.gender), profile.idNumber, profile.phone,
            optional(profile.email), profile.school, profile.grade, profile.schoolId, profile.classId,
            optional(profile.address), optional(profile.emergencyContact), optional(profile.emergencyPhone),
            optional(profile.nativePlace), optional(profile.birthDate), optional(profile.ethnicity), optional(profile.postalCode),
            optional(profile.guardianName), optional(profile.guardianPhone), 0, profile.status, optional(profile.reviewNote),
            optional(profile.reviewedAt), optional(profile.reviewerId), profile.updatedAt
          ),
          operation(
            `UPDATE candidate_account_batch_items SET
              candidate_number = ?, initial_password = ?, user_id = ?, created_at = ? WHERE id = ?`,
            item.candidateNumber, item.initialPassword, item.userId, item.createdAt, item.id
          )
        );
      }
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async transferWorkflow(instance, action, log) {
      const operations = [
        operation('UPDATE workflow_instances SET assignee_id = ? WHERE id = ?', optional(instance.assigneeId), instance.id),
        workflowActionOperation(action)
      ];
      if (log) operations.push(auditOperation(log));
      await transaction(operations);
    },
    async saveWorkflow(workflow, log) {
      const operations = [
        operation(
          `UPDATE workflow_definitions SET name = ?, active = ?, updated_by = ?, updated_at = ? WHERE id = ?`,
          workflow.name, workflow.active ? 1 : 0, optional(workflow.updatedBy), workflow.updatedAt, workflow.id
        ),
        operation('DELETE FROM workflow_steps WHERE workflow_id = ?', workflow.id)
      ];
      workflow.steps.forEach((step, index) => operations.push(operation(
        `INSERT INTO workflow_steps (id, workflow_id, position, name, admin_level) VALUES (?, ?, ?, ?, ?)`,
        step.id, workflow.id, Number(step.position || index + 1), step.name, step.adminLevel
      )));
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async saveNumberRule(rule, isNew, log) {
      const operations = [operation('UPDATE number_rules SET active = 0 WHERE active = 1')];
      if (isNew) {
        operations.push(operation(
          'INSERT INTO number_rules (id, name, separator, active, created_by, updated_at) VALUES (?, ?, ?, ?, ?, ?)',
          rule.id, rule.name, rule.separator, rule.active ? 1 : 0, optional(rule.createdBy), rule.updatedAt
        ));
      } else {
        operations.push(
          operation(
            'UPDATE number_rules SET name = ?, separator = ?, active = ?, created_by = ?, updated_at = ? WHERE id = ?',
            rule.name, rule.separator, rule.active ? 1 : 0, optional(rule.createdBy), rule.updatedAt, rule.id
          ),
          operation('DELETE FROM number_rule_segments WHERE rule_id = ?', rule.id)
        );
      }
      rule.segments.forEach((segment, index) => operations.push(operation(
        `INSERT INTO number_rule_segments (id, rule_id, position, type, value, width) VALUES (?, ?, ?, ?, ?, ?)`,
        segment.id, rule.id, Number(segment.position || index + 1), segment.type,
        optional(segment.value), Number(segment.width || 0)
      )));
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async createAdmin(user, log) {
      await transaction([
        operation(
          `INSERT INTO users (
            id, username, password_hash, role, admin_level, school_id, class_id, active, display_name, created_at
          ) VALUES (?, ?, ?, 'admin', ?, ?, ?, ?, ?, ?)`,
          user.id, user.username, user.passwordHash, user.adminLevel, optional(user.schoolId), optional(user.classId),
          user.active === false ? 0 : 1, user.displayName, user.createdAt
        ),
        auditOperation(log)
      ]);
    },
    async saveSchoolClass(schoolClass, isNew, log) {
      const change = isNew
        ? operation(
            'INSERT INTO school_classes (id, school_id, name, grade, active) VALUES (?, ?, ?, ?, ?)',
            schoolClass.id, schoolClass.schoolId, schoolClass.name, schoolClass.grade, schoolClass.active ? 1 : 0
          )
        : operation(
            'UPDATE school_classes SET name = ?, grade = ?, active = ? WHERE id = ?',
            schoolClass.name, schoolClass.grade, schoolClass.active ? 1 : 0, schoolClass.id
          );
      await transaction([change, auditOperation(log)]);
    },
    async updateAdmin(user, passwordChanged, log) {
      const sql = passwordChanged
        ? 'UPDATE users SET display_name = ?, class_id = ?, active = ?, password_hash = ? WHERE id = ?'
        : 'UPDATE users SET display_name = ?, class_id = ?, active = ? WHERE id = ?';
      const params = passwordChanged
        ? [user.displayName, optional(user.classId), user.active ? 1 : 0, user.passwordHash, user.id]
        : [user.displayName, optional(user.classId), user.active ? 1 : 0, user.id];
      await transaction([operation(sql, ...params), auditOperation(log)]);
    },
    async saveTestCenter(center, isNew, log) {
      const centerOperation = isNew
        ? operation(
            `INSERT INTO test_centers (
              id, school_id, name, address, contact, rooms, updated_at
            ) VALUES (?, ?, ?, ?, ?, ?, ?)`,
            center.id, center.schoolId, center.name, center.address, optional(center.contact), center.rooms, center.updatedAt
          )
        : operation(
            `UPDATE test_centers SET
              name = ?, address = ?, contact = ?, rooms = ?, updated_at = ? WHERE id = ?`,
            center.name, center.address, optional(center.contact), center.rooms, center.updatedAt, center.id
          );
      await transaction([centerOperation, auditOperation(log)]);
    },
    async createCenterChangeRequest(request, rooms, instance, action, log) {
      const operations = [
        operation(
          `INSERT INTO center_change_requests (
            id, center_id, school_id, request_type, code, name, address, contact, manager_name, manager_phone,
            emergency_phone, gate_open_time, transport, center_status, notes, status, review_note,
            requested_by, created_at, reviewed_at
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
          request.id, optional(request.centerId), request.schoolId, request.requestType, request.code, request.name,
          request.address, optional(request.contact), optional(request.managerName), optional(request.managerPhone),
          optional(request.emergencyPhone), optional(request.gateOpenTime), optional(request.transport),
          request.centerStatus, optional(request.notes), request.status, optional(request.reviewNote),
          optional(request.requestedBy), request.createdAt, optional(request.reviewedAt)
        ),
        ...workflowCreateOperations(instance, action)
      ];
      for (const room of rooms) operations.push(operation(
        `INSERT INTO center_change_rooms (
          id, request_id, room_id, code, name, building, floor, capacity, seat_plan, seat_start, seat_end, room_type, status, notes
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
        room.id, request.id, optional(room.roomId), room.code, room.name, room.building, optional(room.floor),
        Number(room.capacity), optional(room.seatPlan), 1, Number(room.capacity), room.roomType, room.status,
        optional(room.notes)
      ));
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async applyCenterChange(request, instance, action, center, rooms, log) {
      const operations = [
        operation(
          `UPDATE workflow_instances SET
            status = ?, current_step = ?, assignee_id = ?, completed_at = ? WHERE id = ?`,
          instance.status, Number(instance.currentStep), optional(instance.assigneeId), optional(instance.completedAt), instance.id
        ),
        workflowActionOperation(action),
        operation(
          `UPDATE center_change_requests SET status = ?, review_note = ?, reviewed_at = ? WHERE id = ?`,
          request.status, optional(request.reviewNote), optional(request.reviewedAt), request.id
        )
      ];
      if (request.status === 'approved' && center) {
        if (request.requestType === 'create') {
          operations.push(operation(
            `INSERT INTO test_centers (
              id, school_id, code, name, address, contact, manager_name, manager_phone, emergency_phone,
              gate_open_time, transport, status, notes, rooms, updated_at
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
            center.id, center.schoolId, center.code, center.name, center.address, optional(center.contact),
            optional(center.managerName), optional(center.managerPhone), optional(center.emergencyPhone),
            optional(center.gateOpenTime), optional(center.transport), center.status, optional(center.notes),
            center.rooms || '', center.updatedAt
          ));
        } else {
          operations.push(operation(
            `UPDATE test_centers SET
              code = ?, name = ?, address = ?, contact = ?, manager_name = ?, manager_phone = ?,
              emergency_phone = ?, gate_open_time = ?, transport = ?, status = ?, notes = ?, rooms = ?, updated_at = ?
            WHERE id = ?`,
            center.code, center.name, center.address, optional(center.contact), optional(center.managerName),
            optional(center.managerPhone), optional(center.emergencyPhone), optional(center.gateOpenTime),
            optional(center.transport), center.status, optional(center.notes), center.rooms || '', center.updatedAt, center.id
          ));
        }
        operations.push(operation('DELETE FROM test_rooms WHERE center_id = ?', center.id));
        for (const room of rooms) operations.push(operation(
          `INSERT INTO test_rooms (
            id, center_id, code, name, building, floor, capacity, seat_plan, seat_start, seat_end, room_type, status, notes
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
          room.id, center.id, room.code, room.name, room.building, optional(room.floor), Number(room.capacity),
          optional(room.seatPlan), 1, Number(room.capacity), room.roomType, room.status, optional(room.notes)
        ));
      }
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async createAdmitCard(registrationId, admitCard, log) {
      await transaction([
        operation(
          `INSERT INTO admit_cards (
            registration_id, card_number, test_center, room, seat, generated_at
          ) VALUES (?, ?, ?, ?, ?, ?)`,
          registrationId, admitCard.number, admitCard.testCenter, admitCard.room, admitCard.seat, admitCard.generatedAt
        ),
        auditOperation(log)
      ]);
    },
    async createExam(exam, log) {
      const operations = [operation(
        `INSERT INTO exams (
          id, code, name, description, registration_start, registration_end, exam_start, exam_end,
          admit_download_start, admit_download_end, location, pass_policy, pass_value, status, created_at
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
        exam.id, exam.code, exam.name, exam.description || '', exam.registrationStart, exam.registrationEnd,
        exam.examStart, exam.examEnd, exam.admitDownloadStart, exam.admitDownloadEnd,
        exam.location || '', exam.passPolicy, exam.passValue, exam.status, exam.createdAt
      )];
      exam.subjects.forEach((subject, index) => operations.push(operation(
        `INSERT INTO exam_subjects (
          id, exam_id, name, subject_date, start_time, end_time, fee, full_score, pass_score, position
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
        subject.id, exam.id, subject.name, subject.date || String(exam.examStart).slice(0, 10),
        subject.start || '', subject.end || '', Number(subject.fee || 0), Number(subject.fullScore),
        Number(subject.passScore), Number(subject.order || index + 1)
      )));
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async updateExam(exam, log, replaceSubjects = false) {
      const operations = [
        operation(
          `UPDATE exams SET
            code = ?, name = ?, description = ?, registration_start = ?, registration_end = ?,
            exam_start = ?, exam_end = ?, admit_download_start = ?, admit_download_end = ?,
            location = ?, pass_policy = ?, pass_value = ?, status = ? WHERE id = ?`,
          exam.code, exam.name, exam.description || '', exam.registrationStart, exam.registrationEnd,
          exam.examStart, exam.examEnd, exam.admitDownloadStart, exam.admitDownloadEnd,
          exam.location || '', exam.passPolicy, exam.passValue, exam.status, exam.id
        )
      ];
      if (replaceSubjects) {
        operations.push(operation('DELETE FROM exam_subjects WHERE exam_id = ?', exam.id));
        exam.subjects.forEach((subject, index) => operations.push(operation(
          `INSERT INTO exam_subjects (
            id, exam_id, name, subject_date, start_time, end_time, fee, full_score, pass_score, position
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
          subject.id, exam.id, subject.name, subject.date || String(exam.examStart).slice(0, 10),
          subject.start || '', subject.end || '', Number(subject.fee || 0), Number(subject.fullScore),
          Number(subject.passScore), Number(subject.order || index + 1)
        )));
      }
      operations.push(auditOperation(log));
      await transaction(operations);
    },
    async createNotice(notice, log) {
      await transaction([
        operation(
          `INSERT INTO notices (
            id, title, summary, content, category, pinned, status, publish_at, created_at, author
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
          notice.id, notice.title, notice.summary, notice.content, notice.category, notice.pinned ? 1 : 0,
          notice.status, optional(notice.publishAt), optional(notice.createdAt), notice.author
        ),
        auditOperation(log)
      ]);
    },
    async updateNotice(notice, log) {
      await transaction([
        operation(
          `UPDATE notices SET title = ?, summary = ?, content = ?, category = ?, pinned = ?, status = ?, publish_at = ? WHERE id = ?`,
          notice.title, notice.summary, notice.content, notice.category, notice.pinned ? 1 : 0,
          notice.status, optional(notice.publishAt), notice.id
        ),
        auditOperation(log)
      ]);
    },
    async saveResult(result, isNew, log) {
      const resultOperation = isNew
        ? operation(
            `INSERT INTO results (
              id, registration_id, subject_id, score, grade, published, updated_at, published_at
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
            result.id, result.registrationId, result.subjectId, result.score, result.grade,
            result.published ? 1 : 0, optional(result.updatedAt), optional(result.publishedAt)
          )
        : operation(
            `UPDATE results SET score = ?, grade = ?, published = ?, updated_at = ?, published_at = ? WHERE id = ?`,
            result.score, result.grade, result.published ? 1 : 0,
            optional(result.updatedAt), optional(result.publishedAt), result.id
          );
      await transaction([resultOperation, auditOperation(log)]);
    }
  };
}

const adapterContext = {
  mkdir,
  dirname,
  sqliteSchema,
  mysqlSchema,
  optional,
  buildSeedOperations,
  stateFromRows,
  readSqliteRows,
  readMysqlRows,
  createRepository
};
const createSqliteStore = createSqliteAdapter(adapterContext);
const createMysqlStore = createMysqlAdapter(adapterContext);

export async function createDatabase({ root, seed }) {
  const client = String(process.env.DATABASE_CLIENT || (process.env.NODE_ENV === 'production' ? 'mysql' : 'sqlite')).toLowerCase();
  if (!['sqlite', 'mysql'].includes(client)) {
    throw new Error(`不支持的 DATABASE_CLIENT：${client}（可选 sqlite 或 mysql）`);
  }

  if (client === 'mysql') return createMysqlStore({ seed });

  const path = resolve(process.env.SQLITE_PATH || join(root, 'data', 'exam.sqlite'));
  return createSqliteStore({ path, seed });
}