airbnb/caravel

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# 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 Any, Optional

from sqlalchemy import types

from superset.constants import TimeGrain
from superset.db_engine_specs.base import BaseEngineSpec, LimitMethod


class FirebirdEngineSpec(BaseEngineSpec):
    """Engine for Firebird"""

    engine = "firebird"
    engine_name = "Firebird"

    # Firebird uses FIRST to limit: `SELECT FIRST 10 * FROM table`
    limit_method = LimitMethod.FETCH_MANY

    _time_grain_expressions = {
        None: "{col}",
        TimeGrain.SECOND: (
            "CAST(CAST({col} AS DATE) "
            "|| ' ' "
            "|| EXTRACT(HOUR FROM {col}) "
            "|| ':' "
            "|| EXTRACT(MINUTE FROM {col}) "
            "|| ':' "
            "|| FLOOR(EXTRACT(SECOND FROM {col})) AS TIMESTAMP)"
        ),
        TimeGrain.MINUTE: (
            "CAST(CAST({col} AS DATE) "
            "|| ' ' "
            "|| EXTRACT(HOUR FROM {col}) "
            "|| ':' "
            "|| EXTRACT(MINUTE FROM {col}) "
            "|| ':00' AS TIMESTAMP)"
        ),
        TimeGrain.HOUR: (
            "CAST(CAST({col} AS DATE) "
            "|| ' ' "
            "|| EXTRACT(HOUR FROM {col}) "
            "|| ':00:00' AS TIMESTAMP)"
        ),
        TimeGrain.DAY: "CAST({col} AS DATE)",
        TimeGrain.MONTH: (
            "CAST(EXTRACT(YEAR FROM {col}) "
            "|| '-' "
            "|| EXTRACT(MONTH FROM {col}) "
            "|| '-01' AS DATE)"
        ),
        TimeGrain.YEAR: "CAST(EXTRACT(YEAR FROM {col}) || '-01-01' AS DATE)",
    }

    @classmethod
    def epoch_to_dttm(cls) -> str:
        return "DATEADD(second, {col}, CAST('00:00:00' AS TIMESTAMP))"

    @classmethod
    def convert_dttm(
        cls, target_type: str, dttm: datetime, db_extra: Optional[dict[str, Any]] = None
    ) -> Optional[str]:
        sqla_type = cls.get_sqla_column_type(target_type)

        if isinstance(sqla_type, types.Date):
            return f"CAST('{dttm.date().isoformat()}' AS DATE)"
        if isinstance(sqla_type, types.DateTime):
            dttm_formatted = dttm.isoformat(sep=" ")
            dttm_valid_precision = dttm_formatted[: len("YYYY-MM-DD HH:MM:SS.MMMM")]
            return f"CAST('{dttm_valid_precision}' AS TIMESTAMP)"
        if isinstance(sqla_type, types.Time):
            return f"CAST('{dttm.time().isoformat()}' AS TIME)"
        return None