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# 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
#
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# software distributed under the License is distributed on an
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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
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from datetime import datetime
from typing import Any, Dict, Optional
from urllib import parse

from sqlalchemy.engine.url import make_url, URL

from superset.db_engine_specs.base import BaseEngineSpec
from superset.utils import core as utils


class TrinoEngineSpec(BaseEngineSpec):
    engine = "trino"
    engine_name = "Trino"

    # pylint: disable=line-too-long
    _time_grain_expressions = {
        None: "{col}",
        "PT1S": "date_trunc('second', CAST({col} AS TIMESTAMP))",
        "PT1M": "date_trunc('minute', CAST({col} AS TIMESTAMP))",
        "PT1H": "date_trunc('hour', CAST({col} AS TIMESTAMP))",
        "P1D": "date_trunc('day', CAST({col} AS TIMESTAMP))",
        "P1W": "date_trunc('week', CAST({col} AS TIMESTAMP))",
        "P1M": "date_trunc('month', CAST({col} AS TIMESTAMP))",
        "P0.25Y": "date_trunc('quarter', CAST({col} AS TIMESTAMP))",
        "P1Y": "date_trunc('year', CAST({col} AS TIMESTAMP))",
        # "1969-12-28T00:00:00Z/P1W",  # Week starting Sunday
        # "1969-12-29T00:00:00Z/P1W",  # Week starting Monday
        # "P1W/1970-01-03T00:00:00Z",  # Week ending Saturday
        # "P1W/1970-01-04T00:00:00Z",  # Week ending Sunday
    }

    @classmethod
    def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]:
        tt = target_type.upper()
        if tt == utils.TemporalType.DATE:
            value = dttm.date().isoformat()
            return f"from_iso8601_date('{value}')"
        if tt == utils.TemporalType.TIMESTAMP:
            value = dttm.isoformat(timespec="microseconds")
            return f"from_iso8601_timestamp('{value}')"
        return None

    @classmethod
    def epoch_to_dttm(cls) -> str:
        return "from_unixtime({col})"

    @classmethod
    def adjust_database_uri(
        cls, uri: URL, selected_schema: Optional[str] = None
    ) -> None:
        database = uri.database
        if selected_schema and database:
            selected_schema = parse.quote(selected_schema, safe="")
            database = database.split("/")[0] + "/" + selected_schema
            uri.database = database

    @classmethod
    def update_impersonation_config(
        cls, connect_args: Dict[str, Any], uri: str, username: Optional[str],
    ) -> None:
        """
        Update a configuration dictionary
        that can set the correct properties for impersonating users
        :param connect_args: config to be updated
        :param uri: URI string
        :param impersonate_user: Flag indicating if impersonation is enabled
        :param username: Effective username
        :return: None
        """
        url = make_url(uri)
        backend_name = url.get_backend_name()

        # Must be Trino connection, enable impersonation, and set optional param
        # auth=LDAP|KERBEROS
        # Set principal_username=$effective_username
        if backend_name == "trino" and username is not None:
            connect_args["user"] = username

    @classmethod
    def modify_url_for_impersonation(
        cls, url: URL, impersonate_user: bool, username: Optional[str]
    ) -> None:
        """
        Modify the SQL Alchemy URL object with the user to impersonate if applicable.
        :param url: SQLAlchemy URL object
        :param impersonate_user: Flag indicating if impersonation is enabled
        :param username: Effective username
        """
        # Do nothing and let update_impersonation_config take care of impersonation
