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"""This module contains the Trino operator."""

from typing import TYPE_CHECKING, Any, Callable, List, Optional, Sequence, Union

from airflow.models import BaseOperator
from airflow.providers.trino.hooks.trino import TrinoHook

if TYPE_CHECKING:
    from airflow.utils.context import Context


class TrinoOperator(BaseOperator):
    """
    Executes sql code using a specific Trino query Engine.

    .. seealso::
        For more information on how to use this operator, take a look at the guide:
        :ref:`howto/operator:TrinoOperator`

    :param sql: the SQL code to be executed as a single string, or
        a list of str (sql statements), or a reference to a template file.
    :param trino_conn_id: id of the connection config for the target Trino
        environment
    :param autocommit: What to set the connection's autocommit setting to
        before executing the query
    :param handler: The result handler which is called with the result of each statement.
    :param parameters: (optional) the parameters to render the SQL query with.
    """

    template_fields: Sequence[str] = ('sql',)
    template_fields_renderers = {'sql': 'sql'}
    template_ext: Sequence[str] = ('.sql',)
    ui_color = '#ededed'

    def __init__(
        self,
        *,
        sql: Union[str, List[str]],
        trino_conn_id: str = "trino_default",
        autocommit: bool = False,
        parameters: Optional[tuple] = None,
        handler: Optional[Callable] = None,
        **kwargs: Any,
    ) -> None:
        super().__init__(**kwargs)
        self.sql = sql
        self.trino_conn_id = trino_conn_id
        self.hook: Optional[TrinoHook] = None
        self.autocommit = autocommit
        self.parameters = parameters
        self.handler = handler

    def get_hook(self) -> TrinoHook:
        """Get Trino hook"""
        return TrinoHook(
            trino_conn_id=self.trino_conn_id,
        )

    def execute(self, context: 'Context') -> None:
        """Execute Trino SQL"""
        self.hook = self.get_hook()
        self.hook.run(
            sql=self.sql, autocommit=self.autocommit, parameters=self.parameters, handler=self.handler
        )
