import dagster as dg
from dagster_snowflake import SnowflakeResource
from src.utils.snowflake.constants import Warehouse
from src.utils.snowflake.query import load_query

USER_DELETE_REQUEST_TABLE_NAME = "RDS_USER_DELETE_REQUEST"
WAREHOUSE = Warehouse.SUNO_PROD_RDS_HOURLY_X_SMALL.value


def parse_daily_partition_key(partition_key: str) -> str:
    """
    Parse daily partition key to extract date.
    
    Args:
        partition_key: String in format "YYYY-MM-DD"
    
    Returns:
        String date in format "YYYY-MM-DD"
    """
    return partition_key


@dg.asset_check(asset="rds_user_delete_request", description="Verify ID uniqueness within partition", blocking=False)
def check_user_delete_request_id_uniqueness(context: dg.AssetCheckExecutionContext, snowflake: SnowflakeResource) -> dg.AssetCheckResult:
    """
    Checks for ID uniqueness within the current daily partition of the RDS_USER_DELETE_REQUEST table.
    """
    partition_key = context.op_execution_context.partition_key
    p_date = parse_daily_partition_key(partition_key)
    
    with snowflake.get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute(load_query("src/utils/snowflake/queries/use_warehouse.sql", params={"warehouse": WAREHOUSE}))
        
        query = f"""
            SELECT 
                COUNT(*), 
                COUNT(DISTINCT ID), 
                COUNT(*) - COUNT(DISTINCT ID)
            FROM {USER_DELETE_REQUEST_TABLE_NAME}
            WHERE P_DATE = '{p_date}'
        """
        cursor.execute(query)
        total, distinct, dupes = cursor.fetchone() or (0, 0, 0)
        
        return dg.AssetCheckResult(
            passed=dupes == 0,
            description=f"{'Unique' if dupes == 0 else f'{dupes} duplicates'}",
            metadata={
                "total_rows": total,
                "distinct_ids": distinct,
                "duplicates": dupes,
                "partition_key": partition_key,
            }
        )


@dg.asset_check(asset="rds_user_delete_request", description="Verify row count > 0 for the partition", blocking=False)
def check_user_delete_request_row_count(context: dg.AssetCheckExecutionContext, snowflake: SnowflakeResource) -> dg.AssetCheckResult:
    """
    Checks that the row count for the current daily partition of the RDS_USER_DELETE_REQUEST table is greater than 0.
    """
    partition_key = context.op_execution_context.partition_key
    p_date = parse_daily_partition_key(partition_key)
    
    with snowflake.get_connection() as conn:
        cursor = conn.cursor()
        cursor.execute(load_query("src/utils/snowflake/queries/use_warehouse.sql", params={"warehouse": WAREHOUSE}))
        
        query = f"""
            SELECT COUNT(*)
            FROM {USER_DELETE_REQUEST_TABLE_NAME}
            WHERE P_DATE = '{p_date}'
        """
        cursor.execute(query)
        row_count = cursor.fetchone()[0]
        
        return dg.AssetCheckResult(
            passed=row_count > 0,
            description=f"Table has {row_count} rows for partition {partition_key}",
            metadata={
                "row_count": row_count,
                "partition_key": partition_key,
            }
        )


asset_checks = [
    check_user_delete_request_id_uniqueness,
    check_user_delete_request_row_count,
]

__all__ = ["asset_checks"]