/**
 * 작업 중 문제 신고 모델
 * 부적합/안전 신고 관련 DB 쿼리
 */

const { getDb } = require('../dbPool');

// ==================== 신고 카테고리 관리 ====================

/**
 * 모든 신고 카테고리 조회
 */
const getAllCategories = async (callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT category_id, category_type, category_name, description, display_order, is_active, created_at
       FROM issue_report_categories
       ORDER BY category_type, display_order, category_id`
    );
    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * 타입별 활성 카테고리 조회 (nonconformity/safety)
 */
const getCategoriesByType = async (categoryType, callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT category_id, category_type, category_name, description, display_order
       FROM issue_report_categories
       WHERE category_type = ? AND is_active = TRUE
       ORDER BY display_order, category_id`,
      [categoryType]
    );
    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * 카테고리 생성
 */
const createCategory = async (categoryData, callback) => {
  try {
    const db = await getDb();
    const { category_type, category_name, description = null, display_order = 0 } = categoryData;

    const [result] = await db.query(
      `INSERT INTO issue_report_categories (category_type, category_name, description, display_order)
       VALUES (?, ?, ?, ?)`,
      [category_type, category_name, description, display_order]
    );

    callback(null, result.insertId);
  } catch (err) {
    callback(err);
  }
};

/**
 * 카테고리 수정
 */
const updateCategory = async (categoryId, categoryData, callback) => {
  try {
    const db = await getDb();
    const { category_name, description, display_order, is_active } = categoryData;

    const [result] = await db.query(
      `UPDATE issue_report_categories
       SET category_name = ?, description = ?, display_order = ?, is_active = ?
       WHERE category_id = ?`,
      [category_name, description, display_order, is_active, categoryId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 카테고리 삭제
 */
const deleteCategory = async (categoryId, callback) => {
  try {
    const db = await getDb();
    const [result] = await db.query(
      `DELETE FROM issue_report_categories WHERE category_id = ?`,
      [categoryId]
    );
    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

// ==================== 사전 정의 신고 항목 관리 ====================

/**
 * 카테고리별 활성 항목 조회
 */
const getItemsByCategory = async (categoryId, callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT item_id, category_id, item_name, description, severity, display_order
       FROM issue_report_items
       WHERE category_id = ? AND is_active = TRUE
       ORDER BY display_order, item_id`,
      [categoryId]
    );
    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * 모든 항목 조회 (관리용)
 */
const getAllItems = async (callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT iri.item_id, iri.category_id, iri.item_name, iri.description,
              iri.severity, iri.display_order, iri.is_active, iri.created_at,
              irc.category_name, irc.category_type
       FROM issue_report_items iri
       INNER JOIN issue_report_categories irc ON iri.category_id = irc.category_id
       ORDER BY irc.category_type, irc.display_order, iri.display_order, iri.item_id`
    );
    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * 항목 생성
 */
const createItem = async (itemData, callback) => {
  try {
    const db = await getDb();
    const { category_id, item_name, description = null, severity = 'medium', display_order = 0 } = itemData;

    const [result] = await db.query(
      `INSERT INTO issue_report_items (category_id, item_name, description, severity, display_order)
       VALUES (?, ?, ?, ?, ?)`,
      [category_id, item_name, description, severity, display_order]
    );

    callback(null, result.insertId);
  } catch (err) {
    callback(err);
  }
};

/**
 * 항목 수정
 */
const updateItem = async (itemId, itemData, callback) => {
  try {
    const db = await getDb();
    const { item_name, description, severity, display_order, is_active } = itemData;

    const [result] = await db.query(
      `UPDATE issue_report_items
       SET item_name = ?, description = ?, severity = ?, display_order = ?, is_active = ?
       WHERE item_id = ?`,
      [item_name, description, severity, display_order, is_active, itemId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 항목 삭제
 */
const deleteItem = async (itemId, callback) => {
  try {
    const db = await getDb();
    const [result] = await db.query(
      `DELETE FROM issue_report_items WHERE item_id = ?`,
      [itemId]
    );
    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 카테고리 ID로 단건 조회
 */
const getCategoryById = async (categoryId, callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT category_id, category_type, category_name, description
       FROM issue_report_categories
       WHERE category_id = ?`,
      [categoryId]
    );
    callback(null, rows[0] || null);
  } catch (err) {
    callback(err);
  }
};

// ==================== 문제 신고 관리 ====================

// 한국 시간 유틸리티 import
const { getKoreaDatetime } = require('../utils/dateUtils');

/**
 * 신고 생성
 */
const createReport = async (reportData, callback) => {
  try {
    const db = await getDb();
    const {
      reporter_id,
      factory_category_id = null,
      workplace_id = null,
      project_id = null,
      custom_location = null,
      tbm_session_id = null,
      visit_request_id = null,
      issue_category_id,
      issue_item_id = null,
      additional_description = null,
      photo_path1 = null,
      photo_path2 = null,
      photo_path3 = null,
      photo_path4 = null,
      photo_path5 = null
    } = reportData;

    // 한국 시간 기준으로 신고 일시 설정
    const reportDate = getKoreaDatetime();

    const [result] = await db.query(
      `INSERT INTO work_issue_reports
       (reporter_id, report_date, factory_category_id, workplace_id, project_id, custom_location,
        tbm_session_id, visit_request_id, issue_category_id, issue_item_id,
        additional_description, photo_path1, photo_path2, photo_path3, photo_path4, photo_path5)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      [reporter_id, reportDate, factory_category_id, workplace_id, project_id, custom_location,
       tbm_session_id, visit_request_id, issue_category_id, issue_item_id,
       additional_description, photo_path1, photo_path2, photo_path3, photo_path4, photo_path5]
    );

    // 상태 변경 로그 기록
    await db.query(
      `INSERT INTO work_issue_status_logs (report_id, previous_status, new_status, changed_by)
       VALUES (?, NULL, 'reported', ?)`,
      [result.insertId, reporter_id]
    );

    callback(null, result.insertId);
  } catch (err) {
    callback(err);
  }
};

/**
 * 신고 목록 조회 (필터 옵션 포함)
 */
const getAllReports = async (filters = {}, callback) => {
  try {
    const db = await getDb();
    let query = `
      SELECT
        wir.report_id, wir.reporter_id, wir.report_date,
        wir.factory_category_id, wir.workplace_id, wir.custom_location,
        wir.tbm_session_id, wir.visit_request_id,
        wir.issue_category_id, wir.issue_item_id, wir.additional_description,
        wir.photo_path1, wir.photo_path2, wir.photo_path3, wir.photo_path4, wir.photo_path5,
        wir.status, wir.assigned_department, wir.assigned_user_id, wir.assigned_at,
        wir.resolution_notes, wir.resolved_at,
        wir.created_at, wir.updated_at,
        u.username as reporter_name, u.name as reporter_full_name,
        wc.category_name as factory_name,
        w.workplace_name,
        irc.category_type, irc.category_name as issue_category_name,
        iri.item_name as issue_item_name, iri.severity,
        assignee.username as assigned_user_name, assignee.name as assigned_full_name
      FROM work_issue_reports wir
      INNER JOIN users u ON wir.reporter_id = u.user_id
      LEFT JOIN workplace_categories wc ON wir.factory_category_id = wc.category_id
      LEFT JOIN workplaces w ON wir.workplace_id = w.workplace_id
      INNER JOIN issue_report_categories irc ON wir.issue_category_id = irc.category_id
      LEFT JOIN issue_report_items iri ON wir.issue_item_id = iri.item_id
      LEFT JOIN users assignee ON wir.assigned_user_id = assignee.user_id
      WHERE 1=1
    `;

    const params = [];

    // 필터 적용
    if (filters.status) {
      query += ` AND wir.status = ?`;
      params.push(filters.status);
    }

    if (filters.category_type) {
      query += ` AND irc.category_type = ?`;
      params.push(filters.category_type);
    }

    if (filters.issue_category_id) {
      query += ` AND wir.issue_category_id = ?`;
      params.push(filters.issue_category_id);
    }

    if (filters.factory_category_id) {
      query += ` AND wir.factory_category_id = ?`;
      params.push(filters.factory_category_id);
    }

    if (filters.workplace_id) {
      query += ` AND wir.workplace_id = ?`;
      params.push(filters.workplace_id);
    }

    if (filters.reporter_id) {
      query += ` AND wir.reporter_id = ?`;
      params.push(filters.reporter_id);
    }

    if (filters.assigned_user_id) {
      query += ` AND wir.assigned_user_id = ?`;
      params.push(filters.assigned_user_id);
    }

    if (filters.start_date && filters.end_date) {
      query += ` AND DATE(wir.report_date) BETWEEN ? AND ?`;
      params.push(filters.start_date, filters.end_date);
    }

    if (filters.search) {
      query += ` AND (wir.additional_description LIKE ? OR iri.item_name LIKE ? OR wir.custom_location LIKE ?)`;
      const searchTerm = `%${filters.search}%`;
      params.push(searchTerm, searchTerm, searchTerm);
    }

    query += ` ORDER BY wir.report_date DESC, wir.report_id DESC`;

    // 페이지네이션
    if (filters.limit) {
      query += ` LIMIT ?`;
      params.push(parseInt(filters.limit));

      if (filters.offset) {
        query += ` OFFSET ?`;
        params.push(parseInt(filters.offset));
      }
    }

    const [rows] = await db.query(query, params);
    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * 신고 상세 조회
 */
const getReportById = async (reportId, callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT
        wir.report_id, wir.reporter_id, wir.report_date,
        wir.factory_category_id, wir.workplace_id, wir.custom_location,
        wir.tbm_session_id, wir.visit_request_id,
        wir.issue_category_id, wir.issue_item_id, wir.additional_description,
        wir.photo_path1, wir.photo_path2, wir.photo_path3, wir.photo_path4, wir.photo_path5,
        wir.status, wir.assigned_department, wir.assigned_user_id, wir.assigned_at, wir.assigned_by,
        wir.resolution_notes, wir.resolution_photo_path1, wir.resolution_photo_path2,
        wir.resolved_at, wir.resolved_by,
        wir.modification_history,
        wir.created_at, wir.updated_at,
        u.username as reporter_name, u.name as reporter_full_name,
        wc.category_name as factory_name,
        w.workplace_name,
        irc.category_type, irc.category_name as issue_category_name,
        iri.item_name as issue_item_name, iri.severity,
        assignee.username as assigned_user_name, assignee.name as assigned_full_name,
        assigner.username as assigned_by_name,
        resolver.username as resolved_by_name
      FROM work_issue_reports wir
      INNER JOIN users u ON wir.reporter_id = u.user_id
      LEFT JOIN workplace_categories wc ON wir.factory_category_id = wc.category_id
      LEFT JOIN workplaces w ON wir.workplace_id = w.workplace_id
      INNER JOIN issue_report_categories irc ON wir.issue_category_id = irc.category_id
      LEFT JOIN issue_report_items iri ON wir.issue_item_id = iri.item_id
      LEFT JOIN users assignee ON wir.assigned_user_id = assignee.user_id
      LEFT JOIN users assigner ON wir.assigned_by = assigner.user_id
      LEFT JOIN users resolver ON wir.resolved_by = resolver.user_id
      WHERE wir.report_id = ?`,
      [reportId]
    );

    callback(null, rows[0]);
  } catch (err) {
    callback(err);
  }
};

/**
 * 신고 수정
 */
const updateReport = async (reportId, reportData, userId, callback) => {
  try {
    const db = await getDb();

    // 기존 데이터 조회
    const [existing] = await db.query(
      `SELECT * FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    if (existing.length === 0) {
      return callback(new Error('신고를 찾을 수 없습니다.'));
    }

    const current = existing[0];

    // 수정 이력 생성
    const modifications = [];
    const now = new Date().toISOString();

    for (const key of Object.keys(reportData)) {
      if (current[key] !== reportData[key] && reportData[key] !== undefined) {
        modifications.push({
          field: key,
          old_value: current[key],
          new_value: reportData[key],
          modified_at: now,
          modified_by: userId
        });
      }
    }

    // 기존 이력과 병합
    const existingHistory = current.modification_history ? JSON.parse(current.modification_history) : [];
    const newHistory = [...existingHistory, ...modifications];

    const {
      factory_category_id,
      workplace_id,
      custom_location,
      issue_category_id,
      issue_item_id,
      additional_description,
      photo_path1,
      photo_path2,
      photo_path3,
      photo_path4,
      photo_path5
    } = reportData;

    const [result] = await db.query(
      `UPDATE work_issue_reports
       SET factory_category_id = COALESCE(?, factory_category_id),
           workplace_id = COALESCE(?, workplace_id),
           custom_location = COALESCE(?, custom_location),
           issue_category_id = COALESCE(?, issue_category_id),
           issue_item_id = COALESCE(?, issue_item_id),
           additional_description = COALESCE(?, additional_description),
           photo_path1 = COALESCE(?, photo_path1),
           photo_path2 = COALESCE(?, photo_path2),
           photo_path3 = COALESCE(?, photo_path3),
           photo_path4 = COALESCE(?, photo_path4),
           photo_path5 = COALESCE(?, photo_path5),
           modification_history = ?,
           updated_at = NOW()
       WHERE report_id = ?`,
      [factory_category_id, workplace_id, custom_location,
       issue_category_id, issue_item_id, additional_description,
       photo_path1, photo_path2, photo_path3, photo_path4, photo_path5,
       JSON.stringify(newHistory), reportId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 신고 삭제
 */
const deleteReport = async (reportId, callback) => {
  try {
    const db = await getDb();

    // 먼저 사진 경로 조회 (삭제용)
    const [photos] = await db.query(
      `SELECT photo_path1, photo_path2, photo_path3, photo_path4, photo_path5,
              resolution_photo_path1, resolution_photo_path2
       FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    const [result] = await db.query(
      `DELETE FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    // 삭제할 사진 경로 반환
    callback(null, { result, photos: photos[0] });
  } catch (err) {
    callback(err);
  }
};

// ==================== 상태 관리 ====================

/**
 * 신고 접수 (reported → received)
 */
const receiveReport = async (reportId, userId, callback) => {
  try {
    const db = await getDb();

    // 현재 상태 확인
    const [current] = await db.query(
      `SELECT status FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    if (current.length === 0) {
      return callback(new Error('신고를 찾을 수 없습니다.'));
    }

    if (current[0].status !== 'reported') {
      return callback(new Error('접수 대기 상태가 아닙니다.'));
    }

    const [result] = await db.query(
      `UPDATE work_issue_reports
       SET status = 'received', updated_at = NOW()
       WHERE report_id = ?`,
      [reportId]
    );

    // 상태 변경 로그
    await db.query(
      `INSERT INTO work_issue_status_logs (report_id, previous_status, new_status, changed_by)
       VALUES (?, 'reported', 'received', ?)`,
      [reportId, userId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 담당자 배정
 */
const assignReport = async (reportId, assignData, callback) => {
  try {
    const db = await getDb();
    const { assigned_department, assigned_user_id, assigned_by } = assignData;

    // 현재 상태 확인
    const [current] = await db.query(
      `SELECT status FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    if (current.length === 0) {
      return callback(new Error('신고를 찾을 수 없습니다.'));
    }

    // 접수 상태 이상이어야 배정 가능
    const validStatuses = ['received', 'in_progress'];
    if (!validStatuses.includes(current[0].status)) {
      return callback(new Error('접수된 상태에서만 담당자 배정이 가능합니다.'));
    }

    const [result] = await db.query(
      `UPDATE work_issue_reports
       SET assigned_department = ?, assigned_user_id = ?,
           assigned_at = NOW(), assigned_by = ?, updated_at = NOW()
       WHERE report_id = ?`,
      [assigned_department, assigned_user_id, assigned_by, reportId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 처리 시작 (received → in_progress)
 */
const startProcessing = async (reportId, userId, callback) => {
  try {
    const db = await getDb();

    // 현재 상태 확인
    const [current] = await db.query(
      `SELECT status FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    if (current.length === 0) {
      return callback(new Error('신고를 찾을 수 없습니다.'));
    }

    if (current[0].status !== 'received') {
      return callback(new Error('접수된 상태에서만 처리를 시작할 수 있습니다.'));
    }

    const [result] = await db.query(
      `UPDATE work_issue_reports
       SET status = 'in_progress', updated_at = NOW()
       WHERE report_id = ?`,
      [reportId]
    );

    // 상태 변경 로그
    await db.query(
      `INSERT INTO work_issue_status_logs (report_id, previous_status, new_status, changed_by)
       VALUES (?, 'received', 'in_progress', ?)`,
      [reportId, userId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 처리 완료 (in_progress → completed)
 */
const completeReport = async (reportId, completionData, callback) => {
  try {
    const db = await getDb();
    const { resolution_notes, resolution_photo_path1, resolution_photo_path2, resolved_by } = completionData;

    // 현재 상태 확인
    const [current] = await db.query(
      `SELECT status FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    if (current.length === 0) {
      return callback(new Error('신고를 찾을 수 없습니다.'));
    }

    if (current[0].status !== 'in_progress') {
      return callback(new Error('처리 중 상태에서만 완료할 수 있습니다.'));
    }

    const [result] = await db.query(
      `UPDATE work_issue_reports
       SET status = 'completed', resolution_notes = ?,
           resolution_photo_path1 = ?, resolution_photo_path2 = ?,
           resolved_at = NOW(), resolved_by = ?, updated_at = NOW()
       WHERE report_id = ?`,
      [resolution_notes, resolution_photo_path1, resolution_photo_path2, resolved_by, reportId]
    );

    // 상태 변경 로그
    await db.query(
      `INSERT INTO work_issue_status_logs (report_id, previous_status, new_status, changed_by, change_reason)
       VALUES (?, 'in_progress', 'completed', ?, ?)`,
      [reportId, resolved_by, resolution_notes]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 신고 종료 (completed → closed)
 */
const closeReport = async (reportId, userId, callback) => {
  try {
    const db = await getDb();

    // 현재 상태 확인
    const [current] = await db.query(
      `SELECT status FROM work_issue_reports WHERE report_id = ?`,
      [reportId]
    );

    if (current.length === 0) {
      return callback(new Error('신고를 찾을 수 없습니다.'));
    }

    if (current[0].status !== 'completed') {
      return callback(new Error('완료된 상태에서만 종료할 수 있습니다.'));
    }

    const [result] = await db.query(
      `UPDATE work_issue_reports
       SET status = 'closed', updated_at = NOW()
       WHERE report_id = ?`,
      [reportId]
    );

    // 상태 변경 로그
    await db.query(
      `INSERT INTO work_issue_status_logs (report_id, previous_status, new_status, changed_by)
       VALUES (?, 'completed', 'closed', ?)`,
      [reportId, userId]
    );

    callback(null, result);
  } catch (err) {
    callback(err);
  }
};

/**
 * 상태 변경 이력 조회
 */
const getStatusLogs = async (reportId, callback) => {
  try {
    const db = await getDb();
    const [rows] = await db.query(
      `SELECT wisl.log_id, wisl.report_id, wisl.previous_status, wisl.new_status,
              wisl.changed_by, wisl.change_reason, wisl.changed_at,
              u.username as changed_by_name, u.name as changed_by_full_name
       FROM work_issue_status_logs wisl
       INNER JOIN users u ON wisl.changed_by = u.user_id
       WHERE wisl.report_id = ?
       ORDER BY wisl.changed_at ASC`,
      [reportId]
    );
    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * m_project_id 업데이트 (System 3 연동 후)
 */
const updateMProjectId = async (reportId, mProjectId, callback) => {
  try {
    const db = await getDb();
    await db.query(
      `UPDATE work_issue_reports SET m_project_id = ? WHERE report_id = ?`,
      [mProjectId, reportId]
    );
    callback(null);
  } catch (err) {
    callback(err);
  }
};

// ==================== 통계 ====================

/**
 * 신고 통계 요약
 */
const getStatsSummary = async (filters = {}, callback) => {
  try {
    const db = await getDb();

    let whereClause = '1=1';
    const params = [];
    let joinClause = '';

    if (filters.category_type) {
      joinClause = ' INNER JOIN issue_report_categories irc ON wir.issue_category_id = irc.category_id';
      whereClause += ` AND irc.category_type = ?`;
      params.push(filters.category_type);
    }

    if (filters.start_date && filters.end_date) {
      whereClause += ` AND DATE(wir.report_date) BETWEEN ? AND ?`;
      params.push(filters.start_date, filters.end_date);
    }

    if (filters.factory_category_id) {
      whereClause += ` AND wir.factory_category_id = ?`;
      params.push(filters.factory_category_id);
    }

    const [rows] = await db.query(
      `SELECT
        COUNT(*) as total,
        SUM(CASE WHEN wir.status = 'reported' THEN 1 ELSE 0 END) as reported,
        SUM(CASE WHEN wir.status = 'received' THEN 1 ELSE 0 END) as received,
        SUM(CASE WHEN wir.status = 'in_progress' THEN 1 ELSE 0 END) as in_progress,
        SUM(CASE WHEN wir.status = 'completed' THEN 1 ELSE 0 END) as completed,
        SUM(CASE WHEN wir.status = 'closed' THEN 1 ELSE 0 END) as closed
       FROM work_issue_reports wir${joinClause}
       WHERE ${whereClause}`,
      params
    );

    callback(null, rows[0]);
  } catch (err) {
    callback(err);
  }
};

/**
 * 카테고리별 통계
 */
const getStatsByCategory = async (filters = {}, callback) => {
  try {
    const db = await getDb();

    let whereClause = '1=1';
    const params = [];

    if (filters.start_date && filters.end_date) {
      whereClause += ` AND DATE(wir.report_date) BETWEEN ? AND ?`;
      params.push(filters.start_date, filters.end_date);
    }

    const [rows] = await db.query(
      `SELECT
        irc.category_type, irc.category_name,
        COUNT(*) as count
       FROM work_issue_reports wir
       INNER JOIN issue_report_categories irc ON wir.issue_category_id = irc.category_id
       WHERE ${whereClause}
       GROUP BY irc.category_id
       ORDER BY irc.category_type, count DESC`,
      params
    );

    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

/**
 * 작업장별 통계
 */
const getStatsByWorkplace = async (filters = {}, callback) => {
  try {
    const db = await getDb();

    let whereClause = 'wir.workplace_id IS NOT NULL';
    const params = [];

    if (filters.start_date && filters.end_date) {
      whereClause += ` AND DATE(wir.report_date) BETWEEN ? AND ?`;
      params.push(filters.start_date, filters.end_date);
    }

    if (filters.factory_category_id) {
      whereClause += ` AND wir.factory_category_id = ?`;
      params.push(filters.factory_category_id);
    }

    const [rows] = await db.query(
      `SELECT
        wir.factory_category_id, wc.category_name as factory_name,
        wir.workplace_id, w.workplace_name,
        COUNT(*) as count
       FROM work_issue_reports wir
       INNER JOIN workplace_categories wc ON wir.factory_category_id = wc.category_id
       INNER JOIN workplaces w ON wir.workplace_id = w.workplace_id
       WHERE ${whereClause}
       GROUP BY wir.factory_category_id, wir.workplace_id
       ORDER BY count DESC`,
      params
    );

    callback(null, rows);
  } catch (err) {
    callback(err);
  }
};

module.exports = {
  // 카테고리
  getAllCategories,
  getCategoriesByType,
  getCategoryById,
  createCategory,
  updateCategory,
  deleteCategory,

  // 항목
  getItemsByCategory,
  getAllItems,
  createItem,
  updateItem,
  deleteItem,

  // 신고
  createReport,
  getAllReports,
  getReportById,
  updateReport,
  deleteReport,

  // System 3 연동
  updateMProjectId,

  // 상태 관리
  receiveReport,
  assignReport,
  startProcessing,
  completeReport,
  closeReport,
  getStatusLogs,

  // 통계
  getStatsSummary,
  getStatsByCategory,
  getStatsByWorkplace
};