# All files / models attendanceModel.js

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

    class AttendanceModel {
      // 일일 근태 기록 조회
      static async getDailyAttendanceRecords(date, workerId = null) {
        const db = await getDb();
        let query = `
          SELECT
            dar.*,
            w.worker_name,
            w.job_type,
            wat.type_name as attendance_type_name,
            wat.type_code as attendance_type_code,
            vt.type_name as vacation_type_name,
            vt.type_code as vacation_type_code,
            vt.hours_deduction as vacation_hours
          FROM daily_attendance_records dar
          LEFT JOIN workers w ON dar.worker_id = w.worker_id
          LEFT JOIN work_attendance_types wat ON dar.attendance_type_id = wat.id
          LEFT JOIN vacation_types vt ON dar.vacation_type_id = vt.id
          WHERE dar.record_date = ?
        `;

        const params = [date];

        if (workerId) {
          query += ' AND dar.worker_id = ?';
          params.push(workerId);
        }

        query += ' ORDER BY w.worker_name';

        const [rows] = await db.execute(query, params);
        return rows;
      }

      // 근태 기록 생성 또는 업데이트
      static async upsertAttendanceRecord(recordData) {
        const db = await getDb();

        const {
          record_date,
          worker_id,
          total_work_hours,
          work_attendance_type_id,
          vacation_type_id,
          is_overtime_approved,
          created_by
        } = recordData;

        // 기존 기록 확인
        const [existing] = await db.execute(
          'SELECT id FROM daily_attendance_records WHERE worker_id = ? AND record_date = ?',
          [worker_id, record_date]
        );

        if (existing.length > 0) {
          // 업데이트
          const [result] = await db.execute(`
            UPDATE daily_attendance_records
            SET
              total_work_hours = ?,
              work_attendance_type_id = ?,
              vacation_type_id = ?,
              is_overtime_approved = ?,
              updated_at = CURRENT_TIMESTAMP
            WHERE id = ?
          `, [
            total_work_hours,
            work_attendance_type_id,
            vacation_type_id,
            is_overtime_approved,
            existing[0].id
          ]);

          return { id: existing[0].id, affected: result.affectedRows };
        } else {
          // 생성
          const [result] = await db.execute(`
            INSERT INTO daily_attendance_records (
              record_date, worker_id, total_work_hours, work_attendance_type_id,
              vacation_type_id, is_overtime_approved, created_by
            ) VALUES (?, ?, ?, ?, ?, ?, ?)
          `, [
            record_date,
            worker_id,
            total_work_hours,
            work_attendance_type_id,
            vacation_type_id,
            is_overtime_approved,
            created_by
          ]);

          return { id: result.insertId, affected: result.affectedRows };
        }
      }

      // 작업자별 근태 현황 조회 (대시보드용)
      static async getWorkerAttendanceStatus(date) {
        const db = await getDb();

        // 모든 작업자와 해당 날짜의 근태 기록을 조회
        const [rows] = await db.execute(`
          SELECT
            w.worker_id,
            w.worker_name,
            w.job_type,
            COALESCE(dar.total_work_hours, 0) as total_work_hours,
            COALESCE(dar.status, 'incomplete') as status,
            dar.is_vacation_processed,
            dar.overtime_approved,
            wat.type_name as attendance_type_name,
            wat.type_code as attendance_type_code,
            vt.type_name as vacation_type_name,
            vt.type_code as vacation_type_code,
            dar.notes,
            -- 작업 건수 계산
            (SELECT COUNT(*) FROM daily_work_reports dwr
             WHERE dwr.worker_id = w.worker_id AND dwr.report_date = ?) as work_count,
            -- 오류 건수 계산
            (SELECT COUNT(*) FROM daily_work_reports dwr
             WHERE dwr.worker_id = w.worker_id AND dwr.report_date = ? AND dwr.work_status_id = 2) as error_count
          FROM workers w
          LEFT JOIN daily_attendance_records dar ON w.worker_id = dar.worker_id AND dar.record_date = ?
          LEFT JOIN work_attendance_types wat ON dar.attendance_type_id = wat.id
          LEFT JOIN vacation_types vt ON dar.vacation_type_id = vt.id
          WHERE w.is_active = TRUE
          ORDER BY w.worker_name
        `, [date, date, date]);

        return rows;
      }

      // 휴가 처리
      static async processVacation(workerId, date, vacationType, createdBy) {
        const db = await getDb();

        // 휴가 유형 정보 조회
        const [vacationTypes] = await db.execute(
          'SELECT * FROM vacation_types WHERE type_code = ?',
          [vacationType]
        );

        if (vacationTypes.length === 0) {
          throw new Error('유효하지 않은 휴가 유형입니다.');
        }

        const vacationTypeInfo = vacationTypes[0];

        // 현재 작업 시간 조회
        const [workHours] = await db.execute(`
          SELECT COALESCE(SUM(work_hours), 0) as total_hours
          FROM daily_work_reports
          WHERE worker_id = ? AND report_date = ?
        `, [workerId, date]);

        const currentHours = parseFloat(workHours[0].total_hours);
        const vacationHours = parseFloat(vacationTypeInfo.hours_deduction);
        const totalHours = currentHours + vacationHours;

        // 근로 유형 결정
        let attendanceTypeCode = 'VACATION';
        let status = 'vacation';

        if (totalHours >= 8) {
          attendanceTypeCode = totalHours > 8 ? 'OVERTIME' : 'REGULAR';
          status = totalHours > 8 ? 'overtime' : 'complete';
        }

        const [attendanceTypes] = await db.execute(
          'SELECT id FROM work_attendance_types WHERE type_code = ?',
          [attendanceTypeCode]
        );

        // 휴가 작업 기록 생성 (프로젝트 ID 13 = "연차/휴무", work_type_id 1 = 기본)
        await db.execute(`
          INSERT INTO daily_work_reports (
            report_date, worker_id, project_id, work_type_id, work_status_id,
            work_hours, description, created_by
          ) VALUES (?, ?, 13, 1, 1, ?, ?, ?)
        `, [
          date,
          workerId,
          vacationHours,
          `${vacationTypeInfo.type_name} 처리`,
          createdBy
        ]);

        // 근태 기록 업데이트
        const attendanceData = {
          record_date: date,
          worker_id: workerId,
          total_work_hours: totalHours,
          work_attendance_type_id: attendanceTypes[0]?.id,
          vacation_type_id: vacationTypeInfo.id,
          is_overtime_approved: false,
          created_by: createdBy
        };

        return await this.upsertAttendanceRecord(attendanceData);
      }

      // 초과근무 승인
      static async approveOvertime(workerId, date, approvedBy) {
        const db = await getDb();

        const [result] = await db.execute(`
          UPDATE daily_attendance_records
          SET
            overtime_approved = TRUE,
            overtime_approved_by = ?,
            overtime_approved_at = CURRENT_TIMESTAMP,
            updated_by = ?,
            updated_at = CURRENT_TIMESTAMP
          WHERE worker_id = ? AND record_date = ?
        `, [approvedBy, approvedBy, workerId, date]);

        return result.affectedRows > 0;
      }

      // 근로 유형 목록 조회
      static async getAttendanceTypes() {
        const db = await getDb();
        const [rows] = await db.execute(
          'SELECT * FROM work_attendance_types WHERE is_active = TRUE ORDER BY id'
        );
        return rows;
      }

      // 휴가 유형 목록 조회
      static async getVacationTypes() {
        const db = await getDb();
        const [rows] = await db.execute(
          'SELECT * FROM vacation_types WHERE is_active = TRUE ORDER BY hours_deduction DESC'
        );
        return rows;
      }

      // 작업자 휴가 잔여 조회
      static async getWorkerVacationBalance(workerId, year = null) {
        const db = await getDb();
        const currentYear = year || new Date().getFullYear();

        const [rows] = await db.execute(`
          SELECT * FROM worker_vacation_balance
          WHERE worker_id = ? AND year = ?
        `, [workerId, currentYear]);

        if (rows.length === 0) {
          // 기본 연차 생성 (15일)
          await db.execute(`
            INSERT INTO worker_vacation_balance (worker_id, year, total_annual_leave)
            VALUES (?, ?, 15.0)
          `, [workerId, currentYear]);

          return {
            worker_id: workerId,
            year: currentYear,
            total_annual_leave: 15.0,
            used_annual_leave: 0,
            remaining_annual_leave: 15.0
          };
        }

        return rows[0];
      }

      // 월별 근태 통계
      static async getMonthlyAttendanceStats(year, month, workerId = null) {
        const db = await getDb();

        let query = `
          SELECT
            w.worker_id,
            w.worker_name,
            COUNT(CASE WHEN dar.status = 'complete' THEN 1 END) as regular_days,
            COUNT(CASE WHEN dar.status = 'overtime' THEN 1 END) as overtime_days,
            COUNT(CASE WHEN dar.status = 'vacation' THEN 1 END) as vacation_days,
            COUNT(CASE WHEN dar.status = 'partial' THEN 1 END) as partial_days,
            COUNT(CASE WHEN dar.status = 'incomplete' THEN 1 END) as incomplete_days,
            SUM(dar.total_work_hours) as total_work_hours,
            AVG(dar.total_work_hours) as avg_work_hours
          FROM workers w
          LEFT JOIN daily_attendance_records dar ON w.worker_id = dar.worker_id
            AND YEAR(dar.record_date) = ? AND MONTH(dar.record_date) = ?
          WHERE w.is_active = TRUE
        `;

        const params = [year, month];

        if (workerId) {
          query += ' AND w.worker_id = ?';
          params.push(workerId);
        }

        query += ' GROUP BY w.worker_id, w.worker_name ORDER BY w.worker_name';

        const [rows] = await db.execute(query, params);
        return rows;
      }
    }

    module.exports = AttendanceModel;