-- =============================================
-- EETGW_Board 테이블 구조 변경: 댓글/답글 시스템 추가
-- 작성일: 2025-12-03
-- 설명: 계층형 댓글/답글을 효율적으로 관리하기 위한 컬럼 추가
-- =============================================

USE [EETGW]
GO

PRINT '=== Starting EETGW_Board structure update ===';
PRINT 'Timestamp: ' + CONVERT(VARCHAR(20), GETDATE(), 120);
GO

-- 1. 기존 테이블 백업
IF NOT EXISTS (SELECT * FROM sys.tables WHERE name = 'EETGW_Board_Backup_20251203')
BEGIN
    SELECT * INTO EETGW_Board_Backup_20251203 FROM EETGW_Board;
    PRINT '✓ Backup created: EETGW_Board_Backup_20251203';
END
ELSE
BEGIN
    PRINT '⚠ Backup already exists: EETGW_Board_Backup_20251203';
END
GO

-- 2. 새로운 컬럼 추가
PRINT '';
PRINT '--- Adding new columns ---';

-- root_idx: 최상위 원글의 idx (답글/댓글이 어느 글에 속하는지)
IF NOT EXISTS (SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('EETGW_Board') AND name = 'root_idx')
BEGIN
    ALTER TABLE EETGW_Board ADD root_idx INT NULL;
    PRINT '✓ Added column: root_idx (최상위 원글 idx)';
END
ELSE
BEGIN
    PRINT '⊙ Column already exists: root_idx';
END
GO

-- depth: 댓글 깊이 (0=원글, 1=1차댓글, 2=2차댓글...)
IF NOT EXISTS (SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('EETGW_Board') AND name = 'depth')
BEGIN
    ALTER TABLE EETGW_Board ADD depth INT NOT NULL DEFAULT 0;
    PRINT '✓ Added column: depth (댓글 깊이)';
END
ELSE
BEGIN
    PRINT '⊙ Column already exists: depth';
END
GO

-- sort_order: 같은 레벨에서의 정렬 순서
IF NOT EXISTS (SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('EETGW_Board') AND name = 'sort_order')
BEGIN
    ALTER TABLE EETGW_Board ADD sort_order INT NOT NULL DEFAULT 0;
    PRINT '✓ Added column: sort_order (정렬 순서)';
END
ELSE
BEGIN
    PRINT '⊙ Column already exists: sort_order';
END
GO

-- thread_path: 계층 경로 (예: "1/5/12" - 빠른 정렬과 조회용)
IF NOT EXISTS (SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('EETGW_Board') AND name = 'thread_path')
BEGIN
    ALTER TABLE EETGW_Board ADD thread_path VARCHAR(1000) NULL;
    PRINT '✓ Added column: thread_path (계층 경로)';
END
ELSE
BEGIN
    PRINT '⊙ Column already exists: thread_path';
END
GO

-- is_comment: 댓글 여부 (true=댓글형식, false=답글형식)
IF NOT EXISTS (SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('EETGW_Board') AND name = 'is_comment')
BEGIN
    ALTER TABLE EETGW_Board ADD is_comment BIT NOT NULL DEFAULT 0;
    PRINT '✓ Added column: is_comment (댓글/답글 구분)';
END
ELSE
BEGIN
    PRINT '⊙ Column already exists: is_comment';
END
GO

-- reply_count: 하위 댓글/답글 개수 (캐시용)
IF NOT EXISTS (SELECT * FROM sys.columns WHERE object_id = OBJECT_ID('EETGW_Board') AND name = 'reply_count')
BEGIN
    ALTER TABLE EETGW_Board ADD reply_count INT NOT NULL DEFAULT 0;
    PRINT '✓ Added column: reply_count (댓글 개수 캐시)';
END
ELSE
BEGIN
    PRINT '⊙ Column already exists: reply_count';
END
GO

-- 3. 기존 데이터 마이그레이션
PRINT '';
PRINT '--- Migrating existing data ---';

-- 원글(pidx가 0이거나 NULL인 경우)
UPDATE EETGW_Board
SET 
    root_idx = idx,
    depth = 0,
    thread_path = CAST(idx AS VARCHAR(20)),
    sort_order = 0,
    is_comment = 0
WHERE ISNULL(pidx, 0) = 0 AND (root_idx IS NULL OR thread_path IS NULL);

DECLARE @originalCount INT = @@ROWCOUNT;
PRINT '✓ Updated ' + CAST(@originalCount AS VARCHAR(10)) + ' original posts (depth=0)';

-- 답글(pidx가 있는 경우) - 1depth만 처리
UPDATE b
SET 
    root_idx = ISNULL(p.root_idx, b.pidx),
    depth = CASE WHEN p.depth IS NULL THEN 1 ELSE p.depth + 1 END,
    thread_path = ISNULL(p.thread_path, CAST(b.pidx AS VARCHAR(20))) + '/' + CAST(b.idx AS VARCHAR(20)),
    sort_order = 0,
    is_comment = 0
FROM EETGW_Board b
LEFT JOIN EETGW_Board p ON b.pidx = p.idx
WHERE ISNULL(b.pidx, 0) > 0 AND (b.root_idx IS NULL OR b.thread_path IS NULL);

DECLARE @replyCount INT = @@ROWCOUNT;
PRINT '✓ Updated ' + CAST(@replyCount AS VARCHAR(10)) + ' reply posts';
GO

-- 4. 인덱스 추가 (성능 최적화)
PRINT '';
PRINT '--- Creating indexes ---';

IF NOT EXISTS (SELECT * FROM sys.indexes WHERE name = 'IX_EETGW_Board_root_idx_thread_path')
BEGIN
    CREATE INDEX IX_EETGW_Board_root_idx_thread_path 
    ON EETGW_Board(root_idx, thread_path);
    PRINT '✓ Created index: IX_EETGW_Board_root_idx_thread_path';
END
ELSE
BEGIN
    PRINT '⊙ Index already exists: IX_EETGW_Board_root_idx_thread_path';
END
GO

IF NOT EXISTS (SELECT * FROM sys.indexes WHERE name = 'IX_EETGW_Board_pidx')
BEGIN
    CREATE INDEX IX_EETGW_Board_pidx 
    ON EETGW_Board(pidx);
    PRINT '✓ Created index: IX_EETGW_Board_pidx';
END
ELSE
BEGIN
    PRINT '⊙ Index already exists: IX_EETGW_Board_pidx';
END
GO

IF NOT EXISTS (SELECT * FROM sys.indexes WHERE name = 'IX_EETGW_Board_bidx_wdate')
BEGIN
    CREATE INDEX IX_EETGW_Board_bidx_wdate 
    ON EETGW_Board(bidx, wdate DESC);
    PRINT '✓ Created index: IX_EETGW_Board_bidx_wdate';
END
ELSE
BEGIN
    PRINT '⊙ Index already exists: IX_EETGW_Board_bidx_wdate';
END
GO

-- 5. reply_count 업데이트 (기존 데이터 기준)
PRINT '';
PRINT '--- Updating reply counts ---';

UPDATE p
SET reply_count = (
    SELECT COUNT(*) 
    FROM EETGW_Board c 
    WHERE c.root_idx = p.idx AND c.depth > 0
)
FROM EETGW_Board p
WHERE p.depth = 0;

DECLARE @updatedRootPosts INT = @@ROWCOUNT;
PRINT '✓ Updated reply_count for ' + CAST(@updatedRootPosts AS VARCHAR(10)) + ' root posts';
GO

-- 6. 트리거 생성 (reply_count 자동 업데이트)
PRINT '';
PRINT '--- Creating triggers ---';

IF EXISTS (SELECT * FROM sys.triggers WHERE name = 'TR_EETGW_Board_AfterInsert')
BEGIN
    DROP TRIGGER TR_EETGW_Board_AfterInsert;
    PRINT '⊙ Dropped existing trigger: TR_EETGW_Board_AfterInsert';
END
GO

CREATE TRIGGER TR_EETGW_Board_AfterInsert
ON EETGW_Board
AFTER INSERT
AS
BEGIN
    SET NOCOUNT ON;
    
    -- 댓글/답글이 추가된 경우 root_idx의 reply_count 증가
    UPDATE b
    SET b.reply_count = b.reply_count + 1
    FROM EETGW_Board b
    INNER JOIN inserted i ON b.idx = i.root_idx
    WHERE i.root_idx IS NOT NULL AND i.depth > 0;
END
GO

PRINT '✓ Created trigger: TR_EETGW_Board_AfterInsert';
GO

IF EXISTS (SELECT * FROM sys.triggers WHERE name = 'TR_EETGW_Board_AfterDelete')
BEGIN
    DROP TRIGGER TR_EETGW_Board_AfterDelete;
    PRINT '⊙ Dropped existing trigger: TR_EETGW_Board_AfterDelete';
END
GO

CREATE TRIGGER TR_EETGW_Board_AfterDelete
ON EETGW_Board
AFTER DELETE
AS
BEGIN
    SET NOCOUNT ON;
    
    -- 댓글/답글이 삭제된 경우 root_idx의 reply_count 감소
    UPDATE b
    SET b.reply_count = b.reply_count - 1
    FROM EETGW_Board b
    INNER JOIN deleted d ON b.idx = d.root_idx
    WHERE d.root_idx IS NOT NULL AND d.depth > 0 AND b.reply_count > 0;
END
GO

PRINT '✓ Created trigger: TR_EETGW_Board_AfterDelete';
GO

-- 7. 조회용 뷰 생성 (옵션)
PRINT '';
PRINT '--- Creating views ---';

IF EXISTS (SELECT * FROM sys.views WHERE name = 'vEETGW_Board_WithReplies')
BEGIN
    DROP VIEW vEETGW_Board_WithReplies;
    PRINT '⊙ Dropped existing view: vEETGW_Board_WithReplies';
END
GO

CREATE VIEW vEETGW_Board_WithReplies
AS
SELECT 
    b.idx,
    b.bidx,
    b.header,
    b.cate,
    b.title,
    b.contents,
    b.[file],
    b.guid,
    b.url,
    b.wuid,
    b.wdate,
    b.project,
    b.pidx,
    b.gcode,
    b.[close],
    b.remark,
    b.root_idx,
    b.depth,
    b.sort_order,
    b.thread_path,
    b.is_comment,
    b.reply_count,
    dbo.getUserName(b.wuid) AS wuid_name,
    CASE WHEN b.depth = 0 THEN b.idx ELSE b.root_idx END AS display_root_idx
FROM EETGW_Board b;
GO

PRINT '✓ Created view: vEETGW_Board_WithReplies';
GO

-- 8. 검증 쿼리
PRINT '';
PRINT '--- Verification ---';

DECLARE @totalPosts INT = (SELECT COUNT(*) FROM EETGW_Board);
DECLARE @rootPosts INT = (SELECT COUNT(*) FROM EETGW_Board WHERE depth = 0);
DECLARE @replyPosts INT = (SELECT COUNT(*) FROM EETGW_Board WHERE depth > 0);

PRINT 'Total posts: ' + CAST(@totalPosts AS VARCHAR(10));
PRINT 'Root posts (depth=0): ' + CAST(@rootPosts AS VARCHAR(10));
PRINT 'Reply posts (depth>0): ' + CAST(@replyPosts AS VARCHAR(10));
GO

PRINT '';
PRINT '=== EETGW_Board structure update completed successfully ===';
PRINT '';
PRINT '📋 New columns added:';
PRINT '  • root_idx: 최상위 원글 idx';
PRINT '  • depth: 댓글 깊이 (0=원글, 1=1차댓글, 2=2차댓글...)';
PRINT '  • sort_order: 같은 레벨에서 정렬 순서';
PRINT '  • thread_path: 계층 경로 (빠른 정렬용)';
PRINT '  • is_comment: 댓글 타입 (0=답글, 1=댓글)';
PRINT '  • reply_count: 하위 댓글 개수';
PRINT '';
PRINT '📝 Usage examples:';
PRINT '  -- 원글 목록 (댓글 개수 포함)';
PRINT '  SELECT * FROM EETGW_Board WHERE bidx = 5 AND depth = 0 ORDER BY wdate DESC;';
PRINT '';
PRINT '  -- 특정 글의 전체 댓글 (계층 구조 유지)';
PRINT '  SELECT * FROM EETGW_Board WHERE root_idx = 123 ORDER BY thread_path, wdate;';
PRINT '';
PRINT '  -- 1depth 댓글만 조회';
PRINT '  SELECT * FROM EETGW_Board WHERE root_idx = 123 AND depth = 1 ORDER BY wdate;';
PRINT '';
PRINT '✅ Migration completed at: ' + CONVERT(VARCHAR(20), GETDATE(), 120);
GO