-- 为学生扩展表补充监护人手机号集合，并兼容已经存在学生、用户关系的历史环境。
-- guardian_phones 保存当前未逻辑删除的 GUARDIAN_WARD 关系中全部监护人手机号，按关系创建顺序去重并使用英文逗号分隔。

SET @guardian_phones_column_exists = (
    SELECT COUNT(*)
    FROM information_schema.columns
    WHERE table_schema = DATABASE()
      AND table_name = 'sys_user_student'
      AND column_name = 'guardian_phones'
);

SET @guardian_phones_ddl = IF(
    @guardian_phones_column_exists = 0,
    'ALTER TABLE `sys_user_student` ADD COLUMN `guardian_phones` text DEFAULT NULL COMMENT ''监护人手机号集合，按监护关系创建顺序去重并使用英文逗号分隔'' AFTER `class_name`',
    'SELECT ''sys_user_student.guardian_phones already exists'''
);

PREPARE guardian_phones_statement FROM @guardian_phones_ddl;
EXECUTE guardian_phones_statement;
DEALLOCATE PREPARE guardian_phones_statement;

SET @previous_group_concat_max_len = @@SESSION.group_concat_max_len;
SET SESSION group_concat_max_len = 65535;

UPDATE `sys_user_student` AS student
LEFT JOIN (
    SELECT relation.tenant_id,
           relation.object_user_id AS student_user_id,
           GROUP_CONCAT(DISTINCT TRIM(guardian.phone) ORDER BY relation.relation_id SEPARATOR ',') AS guardian_phones
    FROM `sys_user_relation` AS relation
    INNER JOIN `sys_user_relation_type` AS relation_type
            ON relation_type.relation_type_id = relation.relation_type_id
           AND relation_type.tenant_id = relation.tenant_id
           AND COALESCE(relation_type.del_flag, '0') = '0'
           AND relation_type.relation_code = 'GUARDIAN_WARD'
    INNER JOIN `sys_user` AS guardian
            ON guardian.user_id = relation.subject_user_id
           AND guardian.tenant_id = relation.tenant_id
           AND COALESCE(guardian.del_flag, '0') = '0'
           AND guardian.phone IS NOT NULL
           AND TRIM(guardian.phone) <> ''
    WHERE COALESCE(relation.del_flag, '0') = '0'
    GROUP BY relation.tenant_id, relation.object_user_id
) AS guardian_relation
        ON guardian_relation.student_user_id = student.user_id
       AND guardian_relation.tenant_id = student.tenant_id
SET student.guardian_phones = guardian_relation.guardian_phones;

SET SESSION group_concat_max_len = @previous_group_concat_max_len;