from sqlalchemy import Column, BigInteger, String, DateTime

class MeasurementData:
    """量测数据表结构定义 - 动态分表"""
    
    @staticmethod
    def get_table_name(account_id: int) -> str:
        return f"measurement_data_{account_id}"
    
    @staticmethod
    def get_create_sql(account_id: int) -> str:
        table_name = MeasurementData.get_table_name(account_id)
        return f"""
        CREATE TABLE IF NOT EXISTS `{table_name}` (
            `id` bigint NOT NULL AUTO_INCREMENT,
            `monitoring_time` datetime DEFAULT NULL COMMENT '监测时间',
            `upload_time` datetime DEFAULT NULL COMMENT '上传时间',
            `monitoring_value` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '监测值(m)',
            `deformation_value` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '变形值(mm)',
            `time_interval` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '时间间隔(h)',
            `cumulative_deformation` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '累计变形量(mm)',
            `deformation_rate` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '变形速率(mm/d)',
            `distance_working_face` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '距掌子面距离(m)',
            `point_id` varchar(100) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '测点id',
            PRIMARY KEY (`id`),
            KEY `idx_point_id` (`point_id`),
            KEY `idx_monitoring_time` (`monitoring_time`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='量测数据';
        """