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from typing import Dict, Iterable, Mapping, Optional, Union

from airflow.models import BaseOperator
from airflow.providers.mysql.hooks.mysql import MySqlHook
from airflow.utils.decorators import apply_defaults


class MySqlOperator(BaseOperator):
    """
    Executes sql code in a specific MySQL database

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

    :param sql: the sql code to be executed. Can receive a str representing a
        sql statement, a list of str (sql statements), or reference to a template file.
        Template reference are recognized by str ending in '.sql'
        (templated)
    :type sql: str or list[str]
    :param mysql_conn_id: reference to a specific mysql database
    :type mysql_conn_id: str
    :param parameters: (optional) the parameters to render the SQL query with.
    :type parameters: dict or iterable
    :param autocommit: if True, each command is automatically committed.
        (default value: False)
    :type autocommit: bool
    :param database: name of database which overwrite defined one in connection
    :type database: str
    """

    template_fields = ("sql",)
    template_ext = (".sql",)
    ui_color = "#ededed"

    @apply_defaults
    def __init__(
        self,
        *,
        sql: str,
        mysql_conn_id: str = "mysql_default",
        parameters: Optional[Union[Mapping, Iterable]] = None,
        autocommit: bool = False,
        database: Optional[str] = None,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.mysql_conn_id = mysql_conn_id
        self.sql = sql
        self.autocommit = autocommit
        self.parameters = parameters
        self.database = database

    def execute(self, context: Dict) -> None:
        self.log.info("Executing: %s", self.sql)
        hook = MySqlHook(mysql_conn_id=self.mysql_conn_id, schema=self.database)
        hook.run(self.sql, autocommit=self.autocommit, parameters=self.parameters)