-- 价格套餐版本中间表 + 版本附加费
-- 关系:
--   prc_price_set
--     -> prc_price_set_version          (步骤2: 版本号自动生成, 生效时间)
--          -> prc_price_set_detail      (步骤3: 产品价格, 通过 psv_id)
--               -> prc_price_set_version_surcharge  (psd_id 关联明细)
-- 可重复执行
SET NAMES utf8mb4;
SET @db := DATABASE();

CREATE TABLE IF NOT EXISTS prc_price_set_version (
  psv_id           BIGINT(20)      NOT NULL AUTO_INCREMENT COMMENT '套餐版本id',
  price_set_id     BIGINT(20)      NOT NULL                COMMENT '价格套餐id',
  version_no       VARCHAR(20)     NOT NULL                COMMENT '版本号 V1/V2，自动+1',
  version_seq      INT(11)         NOT NULL                COMMENT '版本序号，用于自动+1',
  effective_time   DATETIME                 DEFAULT NULL    COMMENT 'version start time (null until activate)',
  expire_time      DATETIME                 DEFAULT NULL    COMMENT '失效时间（空=长期；下一版本启动时写入该启动时间）',
  status           CHAR(1)         NOT NULL DEFAULT '0'    COMMENT '0草稿 1生效 2失效',
  created_by       VARCHAR(64)              DEFAULT ''     COMMENT '创建人',
  create_time      DATETIME                 DEFAULT NULL    COMMENT '创建时间',
  updated_by       VARCHAR(64)              DEFAULT ''     COMMENT '更新人',
  update_time      DATETIME                 DEFAULT NULL    COMMENT '更新时间',
  PRIMARY KEY (psv_id),
  UNIQUE KEY uk_psv_set_no (price_set_id, version_no),
  UNIQUE KEY uk_psv_set_seq (price_set_id, version_seq),
  INDEX idx_psv_set_eff (price_set_id, effective_time),
  INDEX idx_psv_status (status),
  CONSTRAINT fk_psv_set FOREIGN KEY (price_set_id) REFERENCES prc_price_set (price_set_id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='价格套餐版本';

CREATE TABLE IF NOT EXISTS prc_price_set_version_surcharge (
  psvs_id          BIGINT(20)      NOT NULL AUTO_INCREMENT COMMENT '版本附加费id',
  psv_id           BIGINT(20)      NOT NULL                COMMENT '套餐版本id',
  psd_id           BIGINT(20)      NOT NULL                COMMENT '套餐明细id',
  sc_id            BIGINT(20)               DEFAULT NULL    COMMENT '来源附加费配置id',
  product_code     VARCHAR(20)              DEFAULT NULL    COMMENT '产品代码(与明细一致)',
  sc_name          VARCHAR(100)    NOT NULL                COMMENT '附加费名称快照',
  fee_type         VARCHAR(30)     NOT NULL DEFAULT 'SURCHARGE' COMMENT '费用类型(字典bms_fee_type)',
  charge_type      VARCHAR(20)     NOT NULL                COMMENT '计费方式 FIXED固定金额/WEIGHT按重量/RATE按比例',
  charge_value     DECIMAL(18,6)   NOT NULL                COMMENT '计费数值快照',
  currency         CHAR(3)         NOT NULL DEFAULT 'CNY'  COMMENT '币种',
  round_mode       VARCHAR(20)     NOT NULL DEFAULT 'HALF_UP' COMMENT '取值方式(字典bms_round_mode)',
  country_code     CHAR(2)                  DEFAULT NULL    COMMENT '适用国家ISO2(空=全部)',
  sc_note          VARCHAR(500)             DEFAULT NULL    COMMENT '备注',
  created_by       VARCHAR(64)              DEFAULT ''     COMMENT '创建人',
  create_time      DATETIME                 DEFAULT NULL    COMMENT '创建时间',
  updated_by       VARCHAR(64)              DEFAULT ''     COMMENT '更新人',
  update_time      DATETIME                 DEFAULT NULL    COMMENT '更新时间',
  PRIMARY KEY (psvs_id),
  INDEX idx_psvs_psv (psv_id),
  INDEX idx_psvs_psd (psd_id),
  INDEX idx_psvs_product (psv_id, product_code),
  INDEX idx_psvs_sc (sc_id),
  CONSTRAINT fk_psvs_psv FOREIGN KEY (psv_id) REFERENCES prc_price_set_version (psv_id) ON DELETE CASCADE,
  CONSTRAINT fk_psvs_psd FOREIGN KEY (psd_id) REFERENCES prc_price_set_detail (psd_id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='价格套餐版本附加费快照';


-- expire_time: previous version expire = next version effective_time (start)
SET @has := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_version' AND COLUMN_NAME = 'expire_time'
);
SET @sql := IF(@has = 0,
  'ALTER TABLE prc_price_set_version ADD COLUMN expire_time DATETIME DEFAULT NULL COMMENT ''失效时间（空=长期；下一版本启动时写入该启动时间）'' AFTER effective_time',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- backfill: expire_time = next version start time (by version_seq)
UPDATE prc_price_set_version cur
INNER JOIN prc_price_set_version nxt
  ON nxt.price_set_id = cur.price_set_id
 AND nxt.version_seq = cur.version_seq + 1
SET cur.expire_time = nxt.effective_time;

-- prc_price_set_detail.psv_id
SET @has := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_detail' AND COLUMN_NAME = 'psv_id'
);
SET @sql := IF(@has = 0,
  'ALTER TABLE prc_price_set_detail ADD COLUMN psv_id BIGINT(20) DEFAULT NULL COMMENT ''套餐版本id'' AFTER price_set_id',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @has := (
  SELECT COUNT(*) FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_detail' AND INDEX_NAME = 'idx_psd_psv'
);
SET @sql := IF(@has = 0,
  'ALTER TABLE prc_price_set_detail ADD INDEX idx_psd_psv (psv_id)',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @has := (
  SELECT COUNT(*) FROM information_schema.TABLE_CONSTRAINTS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_detail' AND CONSTRAINT_NAME = 'fk_psd_psv'
);
SET @sql := IF(@has = 0,
  'ALTER TABLE prc_price_set_detail ADD CONSTRAINT fk_psd_psv FOREIGN KEY (psv_id) REFERENCES prc_price_set_version (psv_id) ON DELETE CASCADE',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- 已建表补关联: 附加费.psd_id -> 套餐明细
DELETE FROM prc_price_set_version_surcharge
WHERE psd_id IS NULL
   OR NOT EXISTS (
     SELECT 1 FROM prc_price_set_detail d WHERE d.psd_id = prc_price_set_version_surcharge.psd_id
   );

SET @sql := CONCAT(
  'ALTER TABLE prc_price_set_version_surcharge MODIFY COLUMN psd_id BIGINT(20) NOT NULL COMMENT ''套餐明细id'''
);
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

SET @has := (
  SELECT COUNT(*) FROM information_schema.TABLE_CONSTRAINTS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_price_set_version_surcharge' AND CONSTRAINT_NAME = 'fk_psvs_psd'
);
SET @sql := IF(@has = 0,
  'ALTER TABLE prc_price_set_version_surcharge ADD CONSTRAINT fk_psvs_psd FOREIGN KEY (psd_id) REFERENCES prc_price_set_detail (psd_id) ON DELETE CASCADE',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- 回填: 每个已有套餐生成一条 V1
INSERT INTO prc_price_set_version (
  price_set_id, version_no, version_seq, effective_time, status, created_by, create_time
)
SELECT
  s.price_set_id,
  'V1',
  1,
  COALESCE(CAST(s.effective_date AS DATETIME), s.create_time, NOW()),
  CASE
    WHEN s.status = 'S' THEN '2'
    WHEN s.expire_date IS NOT NULL AND s.expire_date <= CURDATE() THEN '2'
    WHEN s.status = 'E' AND (s.effective_date IS NULL OR s.effective_date <= CURDATE()) THEN '1'
    ELSE '0'
  END,
  IFNULL(s.created_by, ''),
  NOW()
FROM prc_price_set s
WHERE NOT EXISTS (
  SELECT 1 FROM prc_price_set_version v WHERE v.price_set_id = s.price_set_id
);

-- 将已有明细绑定到同一套餐的 V1
UPDATE prc_price_set_detail d
INNER JOIN prc_price_set_version v
  ON v.price_set_id = d.price_set_id AND v.version_seq = 1
SET d.psv_id = v.psv_id
WHERE d.psv_id IS NULL;