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# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from datetime import datetime
from typing import Optional

from superset.db_engine_specs.base import LimitMethod
from superset.db_engine_specs.postgres import PostgresBaseEngineSpec


class OracleEngineSpec(PostgresBaseEngineSpec):
    engine = "oracle"
    limit_method = LimitMethod.WRAP_SQL
    force_column_alias_quotes = True
    max_column_name_length = 30

    _time_grain_functions = {
        None: "{col}",
        "PT1S": "CAST({col} as DATE)",
        "PT1M": "TRUNC(CAST({col} as DATE), 'MI')",
        "PT1H": "TRUNC(CAST({col} as DATE), 'HH')",
        "P1D": "TRUNC(CAST({col} as DATE), 'DDD')",
        "P1W": "TRUNC(CAST({col} as DATE), 'WW')",
        "P1M": "TRUNC(CAST({col} as DATE), 'MONTH')",
        "P0.25Y": "TRUNC(CAST({col} as DATE), 'Q')",
        "P1Y": "TRUNC(CAST({col} as DATE), 'YEAR')",
    }

    @classmethod
    def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]:
        tt = target_type.upper()
        if tt == "DATE":
            return f"TO_DATE('{dttm.date().isoformat()}', 'YYYY-MM-DD')"
        if tt == "TIMESTAMP":
            return f"""TO_TIMESTAMP('{dttm.isoformat(timespec="microseconds")}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')"""  # pylint: disable=line-too-long
        return None
