USE baiyue_firstleg;
CREATE TABLE IF NOT EXISTS fl_container_exception_history (
 id BIGINT UNSIGNED NOT NULL COMMENT '货柜异常历史ID', container_booking_id BIGINT UNSIGNED NOT NULL COMMENT '物理货柜ID',
 action VARCHAR(16) NOT NULL COMMENT '操作类型：MARK标记异常、CANCEL取消异常', reason VARCHAR(500) NOT NULL COMMENT '异常原因',
 operator_id BIGINT UNSIGNED NOT NULL COMMENT '操作人ID', operator_name VARCHAR(64) COMMENT '操作人名称快照',
 operation_id VARCHAR(128) NOT NULL COMMENT '同一操作人幂等键', request_hash CHAR(64) NOT NULL COMMENT '请求摘要',
 occurred_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) COMMENT '操作发生时间',
 PRIMARY KEY(id), UNIQUE KEY uk_container_exception_operation(container_booking_id,operator_id,operation_id),
 KEY idx_container_exception_history(container_booking_id,occurred_at,id),
 CONSTRAINT fk_container_exception_booking FOREIGN KEY(container_booking_id) REFERENCES fl_container_booking(id),
 CONSTRAINT chk_container_exception_action CHECK(action IN ('MARK','CANCEL'))
) ENGINE=InnoDB COMMENT='货柜异常标记及取消历史';

DROP PROCEDURE IF EXISTS phase3_container_exception_add_column;
DELIMITER $$
CREATE PROCEDURE phase3_container_exception_add_column(IN p_name VARCHAR(64),IN p_definition TEXT)
BEGIN
 IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_schema=DATABASE() AND table_name='fl_container_exception_history' AND column_name=p_name) THEN
  SET @ddl=CONCAT('ALTER TABLE fl_container_exception_history ADD COLUMN ',p_name,' ',p_definition);
  PREPARE statement FROM @ddl; EXECUTE statement; DEALLOCATE PREPARE statement;
 END IF;
END$$
DELIMITER ;
CALL phase3_container_exception_add_column('operation_id',"VARCHAR(128) NULL COMMENT '同一操作人幂等键' AFTER operator_name");
CALL phase3_container_exception_add_column('request_hash',"CHAR(64) NULL COMMENT '请求摘要' AFTER operation_id");
DROP PROCEDURE phase3_container_exception_add_column;
UPDATE fl_container_exception_history SET operation_id=CONCAT('LEGACY-',id) WHERE operation_id IS NULL OR operation_id='';
UPDATE fl_container_exception_history SET request_hash=SHA2(CONCAT(action,'|',container_booking_id,'|',id,'|',reason),256) WHERE request_hash IS NULL OR request_hash='';
ALTER TABLE fl_container_exception_history MODIFY operation_id VARCHAR(128) NOT NULL, MODIFY request_hash CHAR(64) NOT NULL;
SET @has_exception_operation_index=(SELECT COUNT(*) FROM information_schema.statistics WHERE table_schema=DATABASE() AND table_name='fl_container_exception_history' AND index_name='uk_container_exception_operation');
SET @ddl=IF(@has_exception_operation_index=0,'ALTER TABLE fl_container_exception_history ADD UNIQUE KEY uk_container_exception_operation(container_booking_id,operator_id,operation_id)','SELECT 1');
PREPARE statement FROM @ddl; EXECUTE statement; DEALLOCATE PREPARE statement;

DROP TRIGGER IF EXISTS trg_container_exception_history_before_update;
DROP TRIGGER IF EXISTS trg_container_exception_history_before_delete;
DELIMITER $$
CREATE TRIGGER trg_container_exception_history_before_update BEFORE UPDATE ON fl_container_exception_history FOR EACH ROW
BEGIN SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT='货柜异常历史不可修改'; END$$
CREATE TRIGGER trg_container_exception_history_before_delete BEFORE DELETE ON fl_container_exception_history FOR EACH ROW
BEGIN SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT='货柜异常历史不可删除'; END$$
DELIMITER ;