-- 근로 및 휴가 관리를 위한 테이블 확장
-- 작성일: 2025-11-03

-- 1. 근로 유형 테이블 생성
CREATE TABLE IF NOT EXISTS work_attendance_types (
    id INT PRIMARY KEY AUTO_INCREMENT,
    type_code VARCHAR(20) NOT NULL UNIQUE COMMENT '근로 유형 코드',
    type_name VARCHAR(50) NOT NULL COMMENT '근로 유형명',
    description TEXT COMMENT '설명',
    is_active BOOLEAN DEFAULT TRUE COMMENT '활성 상태',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) COMMENT='근로 유형 관리 테이블';

-- 2. 휴가 유형 테이블 생성
CREATE TABLE IF NOT EXISTS vacation_types (
    id INT PRIMARY KEY AUTO_INCREMENT,
    type_code VARCHAR(20) NOT NULL UNIQUE COMMENT '휴가 유형 코드',
    type_name VARCHAR(50) NOT NULL COMMENT '휴가 유형명',
    hours_deduction DECIMAL(4,2) NOT NULL COMMENT '차감 시간',
    description TEXT COMMENT '설명',
    is_active BOOLEAN DEFAULT TRUE COMMENT '활성 상태',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) COMMENT='휴가 유형 관리 테이블';

-- 3. 일일 근태 기록 테이블 생성
CREATE TABLE IF NOT EXISTS daily_attendance_records (
    id INT PRIMARY KEY AUTO_INCREMENT,
    record_date DATE NOT NULL COMMENT '기록 날짜',
    worker_id INT NOT NULL COMMENT '작업자 ID',
    total_work_hours DECIMAL(4,2) DEFAULT 0 COMMENT '총 작업 시간',
    attendance_type_id INT COMMENT '근로 유형 ID',
    vacation_type_id INT NULL COMMENT '휴가 유형 ID',
    is_vacation_processed BOOLEAN DEFAULT FALSE COMMENT '휴가 처리 여부',
    overtime_approved BOOLEAN DEFAULT FALSE COMMENT '초과근무 승인 여부',
    overtime_approved_by INT NULL COMMENT '초과근무 승인자 ID',
    overtime_approved_at TIMESTAMP NULL COMMENT '초과근무 승인 시간',
    status ENUM('incomplete', 'partial', 'complete', 'overtime', 'vacation', 'error') DEFAULT 'incomplete' COMMENT '상태',
    notes TEXT COMMENT '비고',
    created_by INT NOT NULL COMMENT '생성자 ID',
    updated_by INT NULL COMMENT '수정자 ID',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    
    -- 외래키 제약조건
    FOREIGN KEY (worker_id) REFERENCES workers(worker_id) ON DELETE CASCADE,
    FOREIGN KEY (attendance_type_id) REFERENCES work_attendance_types(id),
    FOREIGN KEY (vacation_type_id) REFERENCES vacation_types(id),
    FOREIGN KEY (overtime_approved_by) REFERENCES users(user_id),
    FOREIGN KEY (created_by) REFERENCES users(user_id),
    FOREIGN KEY (updated_by) REFERENCES users(user_id),
    
    -- 유니크 제약조건 (작업자별 날짜별 하나의 기록)
    UNIQUE KEY unique_worker_date (worker_id, record_date),
    
    -- 인덱스
    INDEX idx_record_date (record_date),
    INDEX idx_worker_date (worker_id, record_date),
    INDEX idx_status (status)
) COMMENT='일일 근태 기록 테이블';

-- 4. 휴가 잔여 관리 테이블 생성
CREATE TABLE IF NOT EXISTS worker_vacation_balance (
    id INT PRIMARY KEY AUTO_INCREMENT,
    worker_id INT NOT NULL COMMENT '작업자 ID',
    year YEAR NOT NULL COMMENT '연도',
    total_annual_leave DECIMAL(4,2) DEFAULT 15.0 COMMENT '연간 총 연차 (일)',
    used_annual_leave DECIMAL(4,2) DEFAULT 0 COMMENT '사용한 연차 (일)',
    remaining_annual_leave DECIMAL(4,2) GENERATED ALWAYS AS (total_annual_leave - used_annual_leave) STORED COMMENT '잔여 연차 (일)',
    notes TEXT COMMENT '비고',
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    
    -- 외래키 제약조건
    FOREIGN KEY (worker_id) REFERENCES workers(worker_id) ON DELETE CASCADE,
    
    -- 유니크 제약조건 (작업자별 연도별 하나의 기록)
    UNIQUE KEY unique_worker_year (worker_id, year),
    
    -- 인덱스
    INDEX idx_worker_year (worker_id, year)
) COMMENT='작업자별 휴가 잔여 관리 테이블';

-- 5. 기본 데이터 삽입

-- 근로 유형 기본 데이터
INSERT INTO work_attendance_types (type_code, type_name, description) VALUES
('REGULAR', '정시근로', '8시간 정규 근무'),
('OVERTIME', '연장근로', '8시간 초과 근무'),
('PARTIAL', '부분근로', '8시간 미만 근무'),
('VACATION', '휴가근로', '휴가와 함께하는 부분 근무')
ON DUPLICATE KEY UPDATE 
    type_name = VALUES(type_name),
    description = VALUES(description);

-- 휴가 유형 기본 데이터
INSERT INTO vacation_types (type_code, type_name, hours_deduction, description) VALUES
('ANNUAL_FULL', '연차', 8.0, '하루 전체 연차'),
('ANNUAL_HALF', '반차', 4.0, '반일 연차'),
('ANNUAL_QUARTER', '반반차', 2.0, '1/4일 연차'),
('SICK_FULL', '병가', 8.0, '하루 전체 병가'),
('SICK_HALF', '반일병가', 4.0, '반일 병가'),
('PERSONAL_FULL', '개인사유', 8.0, '개인사유로 인한 휴가'),
('PERSONAL_HALF', '반일개인사유', 4.0, '반일 개인사유 휴가')
ON DUPLICATE KEY UPDATE 
    type_name = VALUES(type_name),
    hours_deduction = VALUES(hours_deduction),
    description = VALUES(description);

-- 6. daily_work_reports 테이블에 근태 기록 연결 컬럼 추가
ALTER TABLE daily_work_reports 
ADD COLUMN attendance_record_id INT NULL COMMENT '근태 기록 ID' AFTER updated_by,
ADD INDEX idx_attendance_record (attendance_record_id);

-- 외래키 제약조건 추가 (나중에 데이터 정리 후)
-- ALTER TABLE daily_work_reports 
-- ADD FOREIGN KEY (attendance_record_id) REFERENCES daily_attendance_records(id);

-- 7. 휴가 전용 작업 유형 추가 (work_types 테이블에)
INSERT INTO work_types (name, description, is_active) VALUES
('휴가', '연차, 반차, 병가 등 휴가 처리용', TRUE)
ON DUPLICATE KEY UPDATE 
    description = VALUES(description),
    is_active = VALUES(is_active);

-- 8. 뷰 생성 - 일일 근태 현황 조회용
CREATE OR REPLACE VIEW v_daily_attendance_summary AS
SELECT 
    dar.id,
    dar.record_date,
    dar.worker_id,
    w.worker_name,
    w.job_type,
    dar.total_work_hours,
    wat.type_name as attendance_type,
    vt.type_name as vacation_type,
    dar.is_vacation_processed,
    dar.overtime_approved,
    dar.status,
    CASE 
        WHEN dar.status = 'incomplete' THEN '미입력'
        WHEN dar.status = 'partial' THEN '부분입력'
        WHEN dar.status = 'complete' THEN '정시근로'
        WHEN dar.status = 'overtime' THEN '연장근로'
        WHEN dar.status = 'vacation' THEN '휴가'
        WHEN dar.status = 'error' THEN '오류'
        ELSE '알수없음'
    END as status_text,
    dar.notes,
    dar.created_at,
    dar.updated_at
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
ORDER BY dar.record_date DESC, w.worker_name;

-- 9. 트리거 생성 - daily_work_reports 변경 시 근태 기록 자동 업데이트
DELIMITER //

CREATE OR REPLACE TRIGGER tr_update_attendance_on_work_report
AFTER INSERT ON daily_work_reports
FOR EACH ROW
BEGIN
    DECLARE total_hours DECIMAL(4,2);
    DECLARE attendance_type INT;
    DECLARE vacation_type INT;
    DECLARE record_status VARCHAR(20);
    DECLARE existing_record_id INT;
    
    -- 해당 작업자의 해당 날짜 총 작업시간 계산
    SELECT COALESCE(SUM(work_hours), 0) INTO total_hours
    FROM daily_work_reports 
    WHERE worker_id = NEW.worker_id 
    AND report_date = NEW.report_date;
    
    -- 휴가 처리 여부 확인 (work_type_id가 휴가용인지)
    SELECT id INTO vacation_type
    FROM vacation_types 
    WHERE (total_hours = 0 AND type_code = 'ANNUAL_FULL')
       OR (total_hours = 4 AND type_code = 'ANNUAL_HALF')
       OR (total_hours = 6 AND type_code = 'ANNUAL_QUARTER')
    LIMIT 1;
    
    -- 근로 유형 결정
    IF total_hours = 0 THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'PARTIAL';
        SET record_status = 'incomplete';
    ELSEIF total_hours < 8 THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'PARTIAL';
        SET record_status = 'partial';
    ELSEIF total_hours = 8 THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'REGULAR';
        SET record_status = 'complete';
    ELSE
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'OVERTIME';
        SET record_status = 'overtime';
    END IF;
    
    -- 휴가 처리된 경우 상태 조정
    IF vacation_type IS NOT NULL THEN
        SET record_status = 'vacation';
    END IF;
    
    -- 기존 근태 기록 확인
    SELECT id INTO existing_record_id
    FROM daily_attendance_records
    WHERE worker_id = NEW.worker_id AND record_date = NEW.report_date;
    
    -- 근태 기록 업데이트 또는 생성
    IF existing_record_id IS NOT NULL THEN
        UPDATE daily_attendance_records 
        SET 
            total_work_hours = total_hours,
            attendance_type_id = attendance_type,
            vacation_type_id = vacation_type,
            is_vacation_processed = (vacation_type IS NOT NULL),
            status = record_status,
            updated_by = NEW.created_by,
            updated_at = CURRENT_TIMESTAMP
        WHERE id = existing_record_id;
    ELSE
        INSERT INTO daily_attendance_records (
            record_date, worker_id, total_work_hours, attendance_type_id, 
            vacation_type_id, is_vacation_processed, status, created_by
        ) VALUES (
            NEW.report_date, NEW.worker_id, total_hours, attendance_type,
            vacation_type, (vacation_type IS NOT NULL), record_status, NEW.created_by
        );
    END IF;
END//

DELIMITER ;

-- 10. 기존 데이터 마이그레이션을 위한 프로시저
DELIMITER //

CREATE OR REPLACE PROCEDURE sp_migrate_existing_work_reports()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE v_worker_id INT;
    DECLARE v_report_date DATE;
    DECLARE cur CURSOR FOR 
        SELECT DISTINCT worker_id, report_date 
        FROM daily_work_reports 
        ORDER BY report_date DESC, worker_id;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    
    OPEN cur;
    
    read_loop: LOOP
        FETCH cur INTO v_worker_id, v_report_date;
        IF done THEN
            LEAVE read_loop;
        END IF;
        
        -- 각 작업자별 날짜별로 근태 기록 생성/업데이트
        CALL sp_update_attendance_record(v_worker_id, v_report_date);
    END LOOP;
    
    CLOSE cur;
END//

CREATE OR REPLACE PROCEDURE sp_update_attendance_record(
    IN p_worker_id INT,
    IN p_report_date DATE
)
BEGIN
    DECLARE total_hours DECIMAL(4,2);
    DECLARE attendance_type INT;
    DECLARE vacation_type INT;
    DECLARE record_status VARCHAR(20);
    DECLARE existing_record_id INT;
    DECLARE has_vacation_work INT DEFAULT 0;
    
    -- 해당 작업자의 해당 날짜 총 작업시간 계산
    SELECT COALESCE(SUM(work_hours), 0) INTO total_hours
    FROM daily_work_reports 
    WHERE worker_id = p_worker_id 
    AND report_date = p_report_date;
    
    -- 휴가 관련 작업이 있는지 확인 (work_type_id = 999 또는 휴가 관련)
    SELECT COUNT(*) INTO has_vacation_work
    FROM daily_work_reports dwr
    JOIN work_types wt ON dwr.work_type_id = wt.id
    WHERE dwr.worker_id = p_worker_id 
    AND dwr.report_date = p_report_date
    AND (wt.name LIKE '%휴가%' OR wt.name LIKE '%연차%' OR wt.name LIKE '%반차%');
    
    -- 휴가 유형 결정
    IF has_vacation_work > 0 THEN
        IF total_hours = 0 THEN
            SELECT id INTO vacation_type FROM vacation_types WHERE type_code = 'ANNUAL_FULL' LIMIT 1;
        ELSEIF total_hours = 4 THEN
            SELECT id INTO vacation_type FROM vacation_types WHERE type_code = 'ANNUAL_HALF' LIMIT 1;
        ELSEIF total_hours = 6 THEN
            SELECT id INTO vacation_type FROM vacation_types WHERE type_code = 'ANNUAL_QUARTER' LIMIT 1;
        END IF;
    END IF;
    
    -- 근로 유형 및 상태 결정
    IF vacation_type IS NOT NULL THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'VACATION';
        SET record_status = 'vacation';
    ELSEIF total_hours = 0 THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'PARTIAL';
        SET record_status = 'incomplete';
    ELSEIF total_hours < 8 THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'PARTIAL';
        SET record_status = 'partial';
    ELSEIF total_hours = 8 THEN
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'REGULAR';
        SET record_status = 'complete';
    ELSE
        SELECT id INTO attendance_type FROM work_attendance_types WHERE type_code = 'OVERTIME';
        SET record_status = 'overtime';
    END IF;
    
    -- 기존 근태 기록 확인
    SELECT id INTO existing_record_id
    FROM daily_attendance_records
    WHERE worker_id = p_worker_id AND record_date = p_report_date;
    
    -- 근태 기록 업데이트 또는 생성
    IF existing_record_id IS NOT NULL THEN
        UPDATE daily_attendance_records 
        SET 
            total_work_hours = total_hours,
            attendance_type_id = attendance_type,
            vacation_type_id = vacation_type,
            is_vacation_processed = (vacation_type IS NOT NULL),
            status = record_status,
            updated_by = 1,
            updated_at = CURRENT_TIMESTAMP
        WHERE id = existing_record_id;
    ELSE
        INSERT INTO daily_attendance_records (
            record_date, worker_id, total_work_hours, attendance_type_id, 
            vacation_type_id, is_vacation_processed, status, created_by
        ) VALUES (
            p_report_date, p_worker_id, total_hours, attendance_type,
            vacation_type, (vacation_type IS NOT NULL), record_status, 1
        );
    END IF;
END//

DELIMITER ;

-- 11. 권한 및 인덱스 최적화
-- 추가 인덱스 생성
CREATE INDEX idx_daily_work_reports_worker_date ON daily_work_reports(worker_id, report_date);
CREATE INDEX idx_daily_work_reports_work_type ON daily_work_reports(work_type_id);

-- 마이그레이션 실행 (주석 해제하여 실행)
-- CALL sp_migrate_existing_work_reports();

-- 완료 메시지
SELECT 'DB 확장 완료: 근로 및 휴가 관리 시스템이 성공적으로 구축되었습니다.' as message;