-- AI 캐릭터 크리에이터 기능 최소 연결 운영 DB 반영 SQL
-- MySQL 기준. 운영 반영 전 백업과 트랜잭션/락 영향을 점검한다.

-- 1. member.member_kind 추가
SET @member_kind_column_exists := (
    SELECT COUNT(*)
    FROM information_schema.columns
    WHERE table_schema = DATABASE()
      AND table_name = 'member'
      AND column_name = 'member_kind'
);

SET @add_member_kind_sql := IF(
    @member_kind_column_exists = 0,
    'ALTER TABLE member ADD COLUMN member_kind VARCHAR(30) NOT NULL DEFAULT ''HUMAN'' COMMENT ''Member 주체 종류: HUMAN, AI_CHARACTER'' AFTER role',
    'SELECT ''member.member_kind already exists'' AS message'
);

PREPARE add_member_kind_stmt FROM @add_member_kind_sql;
EXECUTE add_member_kind_stmt;
DEALLOCATE PREPARE add_member_kind_stmt;

-- 2. chat_character.creator_member_id nullable 컬럼 추가
SET @creator_member_column_exists := (
    SELECT COUNT(*)
    FROM information_schema.columns
    WHERE table_schema = DATABASE()
      AND table_name = 'chat_character'
      AND column_name = 'creator_member_id'
);

SET @add_creator_member_sql := IF(
    @creator_member_column_exists = 0,
    'ALTER TABLE chat_character ADD COLUMN creator_member_id BIGINT NULL COMMENT ''크리에이터 기능 주체 Member ID''',
    'SELECT ''chat_character.creator_member_id already exists'' AS message'
);

PREPARE add_creator_member_stmt FROM @add_creator_member_sql;
EXECUTE add_creator_member_stmt;
DEALLOCATE PREPARE add_creator_member_stmt;

-- 3. 기존 chat_character별 AI 캐릭터용 Member 생성 및 매핑
DROP TEMPORARY TABLE IF EXISTS tmp_chat_character_creator_member;
CREATE TEMPORARY TABLE tmp_chat_character_creator_member (
    chat_character_id BIGINT NOT NULL PRIMARY KEY,
    creator_member_id BIGINT NULL
) COMMENT 'chat_character와 backfill member.id 임시 매핑';

INSERT INTO tmp_chat_character_creator_member (chat_character_id)
SELECT c.id
FROM chat_character c
WHERE c.creator_member_id IS NULL;

DROP PROCEDURE IF EXISTS backfill_chat_character_creator_member;

DELIMITER //
CREATE PROCEDURE backfill_chat_character_creator_member()
BEGIN
    DECLARE done BOOLEAN DEFAULT FALSE;
    DECLARE v_chat_character_id BIGINT;
    DECLARE v_name VARCHAR(255);
    DECLARE v_description TEXT;
    DECLARE v_image_path VARCHAR(255);

    DECLARE character_cursor CURSOR FOR
        SELECT c.id, c.name, c.description, c.image_path
        FROM chat_character c
        INNER JOIN tmp_chat_character_creator_member m
            ON m.chat_character_id = c.id
        WHERE m.creator_member_id IS NULL
        ORDER BY c.id;

    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN character_cursor;

    read_loop: LOOP
        FETCH character_cursor INTO v_chat_character_id, v_name, v_description, v_image_path;

        IF done THEN
            LEAVE read_loop;
        END IF;

        INSERT INTO member (
            email,
            password,
            nickname,
            profile_image,
            provider,
            gender,
            role,
            member_kind,
            is_visible_donation_rank,
            donation_ranking_period,
            is_active,
            container,
            introduce,
            instagram_url,
            fancimm_url,
            x_url,
            youtube_url,
            website_url,
            blog_url,
            pg_charge_can,
            pg_reward_can,
            google_charge_can,
            google_reward_can,
            apple_charge_can,
            apple_reward_can,
            created_at,
            updated_at
        ) VALUES (
            NULL,
            '',
            v_name,
            v_image_path,
            'EMAIL',
            'NONE',
            'CREATOR',
            'AI_CHARACTER',
            TRUE,
            'CUMULATIVE',
            TRUE,
            'web',
            COALESCE(v_description, ''),
            '',
            '',
            '',
            '',
            '',
            '',
            0,
            0,
            0,
            0,
            0,
            0,
            CURRENT_TIMESTAMP,
            CURRENT_TIMESTAMP
        );

        UPDATE tmp_chat_character_creator_member
        SET creator_member_id = LAST_INSERT_ID()
        WHERE chat_character_id = v_chat_character_id;
    END LOOP;

    CLOSE character_cursor;
END //
DELIMITER ;

CALL backfill_chat_character_creator_member();
DROP PROCEDURE IF EXISTS backfill_chat_character_creator_member;

UPDATE chat_character c
INNER JOIN tmp_chat_character_creator_member m
    ON m.chat_character_id = c.id
SET c.creator_member_id = m.creator_member_id
WHERE c.creator_member_id IS NULL
  AND m.creator_member_id IS NOT NULL;

-- 4. unique index 추가
SET @creator_member_unique_exists := (
    SELECT COUNT(*)
    FROM information_schema.statistics
    WHERE table_schema = DATABASE()
      AND table_name = 'chat_character'
      AND index_name = 'uk_chat_character_creator_member'
);

SET @add_creator_member_unique_sql := IF(
    @creator_member_unique_exists = 0,
    'ALTER TABLE chat_character ADD UNIQUE INDEX uk_chat_character_creator_member (creator_member_id)',
    'SELECT ''uk_chat_character_creator_member already exists'' AS message'
);

PREPARE add_creator_member_unique_stmt FROM @add_creator_member_unique_sql;
EXECUTE add_creator_member_unique_stmt;
DEALLOCATE PREPARE add_creator_member_unique_stmt;

-- 5. foreign key 추가
SET @creator_member_fk_exists := (
    SELECT COUNT(*)
    FROM information_schema.table_constraints
    WHERE table_schema = DATABASE()
      AND table_name = 'chat_character'
      AND constraint_name = 'fk_chat_character_creator_member'
      AND constraint_type = 'FOREIGN KEY'
);

SET @add_creator_member_fk_sql := IF(
    @creator_member_fk_exists = 0,
    'ALTER TABLE chat_character ADD CONSTRAINT fk_chat_character_creator_member FOREIGN KEY (creator_member_id) REFERENCES member (id)',
    'SELECT ''fk_chat_character_creator_member already exists'' AS message'
);

PREPARE add_creator_member_fk_stmt FROM @add_creator_member_fk_sql;
EXECUTE add_creator_member_fk_stmt;
DEALLOCATE PREPARE add_creator_member_fk_stmt;

-- 6. 운영 반영 전 필수 검증. 두 결과 모두 0이어야 한다.
SELECT COUNT(*) AS invalid_ai_character_member_count
FROM member
WHERE member_kind = 'AI_CHARACTER'
  AND role <> 'CREATOR';

SELECT COUNT(*) AS missing_creator_member_count
FROM chat_character
WHERE creator_member_id IS NULL;

-- 7. 검증 완료 후 creator_member_id NOT NULL 전환
SET @missing_creator_member_count := (
    SELECT COUNT(*)
    FROM chat_character
    WHERE creator_member_id IS NULL
);

SET @creator_member_nullable := (
    SELECT is_nullable
    FROM information_schema.columns
    WHERE table_schema = DATABASE()
      AND table_name = 'chat_character'
      AND column_name = 'creator_member_id'
);

SET @modify_creator_member_not_null_sql := IF(
    @missing_creator_member_count = 0 AND @creator_member_nullable = 'YES',
    'ALTER TABLE chat_character MODIFY COLUMN creator_member_id BIGINT NOT NULL COMMENT ''크리에이터 기능 주체 Member ID''',
    'SELECT ''chat_character.creator_member_id not modified; verify missing_creator_member_count is 0 and column is nullable'' AS message'
);

PREPARE modify_creator_member_not_null_stmt FROM @modify_creator_member_not_null_sql;
EXECUTE modify_creator_member_not_null_stmt;
DEALLOCATE PREPARE modify_creator_member_not_null_stmt;

DROP TEMPORARY TABLE IF EXISTS tmp_chat_character_creator_member;