-- ============================================================================
-- Distribution Service Database Schema
-- ============================================================================
-- 목적: 이벤트 배포 상태 및 채널별 성과 추적
-- 작성일: 2025-10-29
-- 작성자: Backend Developer (최수연 "아키텍처")
-- 데이터베이스: PostgreSQL 14+
-- ============================================================================

-- ============================================================================
-- 1. 데이터베이스 및 스키마 생성
-- ============================================================================

-- 데이터베이스 생성 (필요시)
-- CREATE DATABASE distribution_db;

-- 스키마 생성
CREATE SCHEMA IF NOT EXISTS distribution;

-- 스키마를 기본 검색 경로로 설정
SET search_path TO distribution, public;

-- ============================================================================
-- 2. 기존 테이블 삭제 (개발 환경용 - 주의!)
-- ============================================================================

-- 주의: 운영 환경에서는 이 섹션을 주석 처리하거나 제거해야 합니다.
DROP TABLE IF EXISTS distribution.channel_status CASCADE;
DROP TABLE IF EXISTS distribution.distribution_status CASCADE;

-- ============================================================================
-- 3. distribution_status 테이블 생성
-- ============================================================================

CREATE TABLE distribution.distribution_status (
    -- 기본 키
    id                  BIGSERIAL PRIMARY KEY,

    -- 배포 정보
    event_id            VARCHAR(36) NOT NULL,
    overall_status      VARCHAR(20) NOT NULL,

    -- 시간 정보
    started_at          TIMESTAMP NOT NULL,
    completed_at        TIMESTAMP,

    -- 감사 정보
    created_at          TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at          TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,

    -- 제약 조건
    CONSTRAINT uk_distribution_event_id UNIQUE (event_id),
    CONSTRAINT ck_distribution_overall_status CHECK (
        overall_status IN ('IN_PROGRESS', 'COMPLETED', 'FAILED', 'PARTIAL_SUCCESS')
    )
);

-- 코멘트 추가
COMMENT ON TABLE distribution.distribution_status IS '이벤트별 배포 전체 상태 관리';
COMMENT ON COLUMN distribution.distribution_status.id IS '배포 상태 ID (PK)';
COMMENT ON COLUMN distribution.distribution_status.event_id IS '이벤트 ID (UUID)';
COMMENT ON COLUMN distribution.distribution_status.overall_status IS '전체 배포 상태 (IN_PROGRESS, COMPLETED, FAILED, PARTIAL_SUCCESS)';
COMMENT ON COLUMN distribution.distribution_status.started_at IS '배포 시작 시간';
COMMENT ON COLUMN distribution.distribution_status.completed_at IS '배포 완료 시간';
COMMENT ON COLUMN distribution.distribution_status.created_at IS '생성 시간';
COMMENT ON COLUMN distribution.distribution_status.updated_at IS '수정 시간';

-- 인덱스 생성
CREATE INDEX idx_distribution_status_event_id ON distribution.distribution_status(event_id);
CREATE INDEX idx_distribution_status_overall_status ON distribution.distribution_status(overall_status);
CREATE INDEX idx_distribution_status_started_at ON distribution.distribution_status(started_at DESC);

-- ============================================================================
-- 4. channel_status 테이블 생성
-- ============================================================================

CREATE TABLE distribution.channel_status (
    -- 기본 키
    id                      BIGSERIAL PRIMARY KEY,

    -- 외래 키
    distribution_status_id  BIGINT NOT NULL,

    -- 채널 정보
    channel                 VARCHAR(20) NOT NULL,
    status                  VARCHAR(20) NOT NULL,
    progress                INTEGER DEFAULT 0,

    -- 배포 결과 정보
    distribution_id         VARCHAR(100),
    estimated_views         INTEGER DEFAULT 0,

    -- 시간 정보
    update_timestamp        TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    completed_at            TIMESTAMP,

    -- 조회 최적화용
    event_id                VARCHAR(36) NOT NULL,

    -- 채널별 상세 정보
    impression_schedule     TEXT,
    post_url                VARCHAR(500),
    post_id                 VARCHAR(100),
    message_id              VARCHAR(100),

    -- 에러 정보
    error_message           TEXT,
    retries                 INTEGER DEFAULT 0,
    last_retry_at           TIMESTAMP,

    -- 감사 정보
    created_at              TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at              TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,

    -- 외래 키 제약 조건
    CONSTRAINT fk_channel_distribution_status FOREIGN KEY (distribution_status_id)
        REFERENCES distribution.distribution_status(id)
        ON DELETE CASCADE,

    -- 유니크 제약 조건
    CONSTRAINT uk_channel_status_distribution_channel
        UNIQUE (distribution_status_id, channel),

    -- CHECK 제약 조건
    CONSTRAINT ck_channel_status_channel CHECK (
        channel IN ('URIDONGNETV', 'RINGOBIZ', 'GINITV', 'INSTAGRAM', 'NAVER', 'KAKAO')
    ),
    CONSTRAINT ck_channel_status_status CHECK (
        status IN ('PENDING', 'IN_PROGRESS', 'SUCCESS', 'FAILED')
    ),
    CONSTRAINT ck_channel_status_progress CHECK (
        progress BETWEEN 0 AND 100
    )
);

-- 코멘트 추가
COMMENT ON TABLE distribution.channel_status IS '채널별 세부 배포 상태 및 성과 추적';
COMMENT ON COLUMN distribution.channel_status.id IS '채널 상태 ID (PK)';
COMMENT ON COLUMN distribution.channel_status.distribution_status_id IS '배포 상태 ID (FK)';
COMMENT ON COLUMN distribution.channel_status.channel IS '채널 타입 (URIDONGNETV, RINGOBIZ, GINITV, INSTAGRAM, NAVER, KAKAO)';
COMMENT ON COLUMN distribution.channel_status.status IS '채널 배포 상태 (PENDING, IN_PROGRESS, SUCCESS, FAILED)';
COMMENT ON COLUMN distribution.channel_status.progress IS '진행률 (0-100)';
COMMENT ON COLUMN distribution.channel_status.distribution_id IS '채널별 배포 ID (외부 시스템 ID)';
COMMENT ON COLUMN distribution.channel_status.estimated_views IS '예상 도달률 (조회수)';
COMMENT ON COLUMN distribution.channel_status.update_timestamp IS '상태 업데이트 시간';
COMMENT ON COLUMN distribution.channel_status.event_id IS '이벤트 ID (조회 최적화용)';
COMMENT ON COLUMN distribution.channel_status.impression_schedule IS '노출 일정 (JSON 배열)';
COMMENT ON COLUMN distribution.channel_status.post_url IS '게시물 URL';
COMMENT ON COLUMN distribution.channel_status.post_id IS '게시물 ID';
COMMENT ON COLUMN distribution.channel_status.message_id IS '메시지 ID (카카오톡)';
COMMENT ON COLUMN distribution.channel_status.completed_at IS '채널 배포 완료 시간';
COMMENT ON COLUMN distribution.channel_status.error_message IS '에러 메시지';
COMMENT ON COLUMN distribution.channel_status.retries IS '재시도 횟수';
COMMENT ON COLUMN distribution.channel_status.last_retry_at IS '마지막 재시도 시간';
COMMENT ON COLUMN distribution.channel_status.created_at IS '생성 시간';
COMMENT ON COLUMN distribution.channel_status.updated_at IS '수정 시간';

-- 인덱스 생성
CREATE INDEX idx_channel_status_event_id ON distribution.channel_status(event_id);
CREATE INDEX idx_channel_status_event_channel ON distribution.channel_status(event_id, channel);
CREATE INDEX idx_channel_status_status ON distribution.channel_status(status);
CREATE INDEX idx_channel_status_distribution_status_id ON distribution.channel_status(distribution_status_id);

-- ============================================================================
-- 5. 트리거 생성 (updated_at 자동 업데이트)
-- ============================================================================

-- updated_at 자동 업데이트 함수
CREATE OR REPLACE FUNCTION distribution.update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

-- distribution_status 테이블 트리거
CREATE TRIGGER trg_distribution_status_updated_at
    BEFORE UPDATE ON distribution.distribution_status
    FOR EACH ROW
    EXECUTE FUNCTION distribution.update_updated_at_column();

-- channel_status 테이블 트리거
CREATE TRIGGER trg_channel_status_updated_at
    BEFORE UPDATE ON distribution.channel_status
    FOR EACH ROW
    EXECUTE FUNCTION distribution.update_updated_at_column();

-- ============================================================================
-- 6. 샘플 데이터 삽입 (개발 환경용)
-- ============================================================================

-- 주의: 운영 환경에서는 이 섹션을 제거해야 합니다.

-- 샘플 배포 상태 1: 진행 중
INSERT INTO distribution.distribution_status (
    event_id, overall_status, started_at, completed_at
) VALUES (
    '123e4567-e89b-12d3-a456-426614174000',
    'IN_PROGRESS',
    CURRENT_TIMESTAMP,
    NULL
);

-- 샘플 채널 상태 1: Instagram (성공)
INSERT INTO distribution.channel_status (
    distribution_status_id, channel, status, progress,
    distribution_id, estimated_views, event_id,
    post_url, post_id
) VALUES (
    1,
    'INSTAGRAM',
    'SUCCESS',
    100,
    'ig_post_12345',
    5000,
    '123e4567-e89b-12d3-a456-426614174000',
    'https://instagram.com/p/abc123',
    'abc123'
);

-- 샘플 채널 상태 2: 카카오톡 (진행 중)
INSERT INTO distribution.channel_status (
    distribution_status_id, channel, status, progress,
    distribution_id, estimated_views, event_id,
    message_id
) VALUES (
    1,
    'KAKAO',
    'IN_PROGRESS',
    75,
    'kakao_msg_67890',
    3000,
    '123e4567-e89b-12d3-a456-426614174000',
    'msg_67890'
);

-- 샘플 배포 상태 2: 완료
INSERT INTO distribution.distribution_status (
    event_id, overall_status, started_at, completed_at
) VALUES (
    '223e4567-e89b-12d3-a456-426614174001',
    'COMPLETED',
    CURRENT_TIMESTAMP - INTERVAL '2 hours',
    CURRENT_TIMESTAMP - INTERVAL '1 hour'
);

-- 샘플 채널 상태 3: 네이버 (성공)
INSERT INTO distribution.channel_status (
    distribution_status_id, channel, status, progress,
    distribution_id, estimated_views, event_id,
    post_url, post_id, completed_at
) VALUES (
    2,
    'NAVER',
    'SUCCESS',
    100,
    'naver_post_11111',
    8000,
    '223e4567-e89b-12d3-a456-426614174001',
    'https://blog.naver.com/post/11111',
    '11111',
    CURRENT_TIMESTAMP - INTERVAL '1 hour'
);

-- ============================================================================
-- 7. 권한 설정 (필요시)
-- ============================================================================

-- 애플리케이션 사용자 권한 부여 (예시)
-- CREATE USER distribution_app WITH PASSWORD 'secure_password';
-- GRANT USAGE ON SCHEMA distribution TO distribution_app;
-- GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA distribution TO distribution_app;
-- GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA distribution TO distribution_app;

-- ============================================================================
-- 8. 데이터 검증 쿼리
-- ============================================================================

-- 테이블 생성 확인
SELECT table_name, table_type
FROM information_schema.tables
WHERE table_schema = 'distribution'
ORDER BY table_name;

-- 제약 조건 확인
SELECT
    tc.constraint_name,
    tc.table_name,
    tc.constraint_type,
    kcu.column_name
FROM information_schema.table_constraints tc
JOIN information_schema.key_column_usage kcu
    ON tc.constraint_name = kcu.constraint_name
    AND tc.table_schema = kcu.table_schema
WHERE tc.table_schema = 'distribution'
ORDER BY tc.table_name, tc.constraint_type;

-- 인덱스 확인
SELECT
    schemaname,
    tablename,
    indexname,
    indexdef
FROM pg_indexes
WHERE schemaname = 'distribution'
ORDER BY tablename, indexname;

-- 샘플 데이터 확인
SELECT
    ds.event_id,
    ds.overall_status,
    COUNT(cs.id) AS channel_count,
    SUM(CASE WHEN cs.status = 'SUCCESS' THEN 1 ELSE 0 END) AS success_count,
    SUM(cs.estimated_views) AS total_estimated_views
FROM distribution.distribution_status ds
LEFT JOIN distribution.channel_status cs ON ds.id = cs.distribution_status_id
GROUP BY ds.event_id, ds.overall_status;

-- ============================================================================
-- 9. 성능 모니터링 쿼리 (운영용)
-- ============================================================================

-- 배포 상태별 통계
SELECT
    overall_status,
    COUNT(*) AS count,
    AVG(EXTRACT(EPOCH FROM (completed_at - started_at))) AS avg_duration_seconds
FROM distribution.distribution_status
WHERE completed_at IS NOT NULL
GROUP BY overall_status;

-- 채널별 성공률
SELECT
    channel,
    COUNT(*) AS total_distributions,
    SUM(CASE WHEN status = 'SUCCESS' THEN 1 ELSE 0 END) AS success_count,
    ROUND(100.0 * SUM(CASE WHEN status = 'SUCCESS' THEN 1 ELSE 0 END) / COUNT(*), 2) AS success_rate
FROM distribution.channel_status
GROUP BY channel
ORDER BY success_rate DESC;

-- 평균 재시도 횟수
SELECT
    channel,
    AVG(retries) AS avg_retries,
    MAX(retries) AS max_retries
FROM distribution.channel_status
WHERE retries > 0
GROUP BY channel
ORDER BY avg_retries DESC;

-- ============================================================================
-- 스키마 생성 완료
-- ============================================================================