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from __future__ import annotations

import os
import tempfile
import warnings
from collections.abc import Sequence
from typing import TYPE_CHECKING

from airflow.providers.google.cloud.hooks.gcs import GCSHook
from airflow.providers.google.version_compat import BaseOperator
from airflow.providers.salesforce.hooks.salesforce import SalesforceHook

if TYPE_CHECKING:
    from airflow.providers.common.compat.sdk import Context


class SalesforceToGcsOperator(BaseOperator):
    """
    Submits Salesforce query and uploads results to Google Cloud Storage.

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

    :param query: The query to make to Salesforce.
    :param bucket_name: The bucket to upload to.
    :param object_name: The object name to set when uploading the file.
    :param salesforce_conn_id: the name of the connection that has the parameters
        we need to connect to Salesforce.
    :param include_deleted: True if the query should include deleted records.
    :param query_params: Additional optional arguments
    :param export_format: Desired format of files to be exported.
    :param coerce_to_timestamp: True if you want all datetime fields to be converted into Unix timestamps.
        False if you want them to be left in the same format as they were in Salesforce.
        Leaving the value as False will result in datetimes being strings. Default: False
    :param record_time_added: True if you want to add a Unix timestamp field
        to the resulting data that marks when the data was fetched from Salesforce. Default: False
    :param gzip: Option to compress local file or file data for upload
    :param gcp_conn_id: the name of the connection that has the parameters we need to connect to GCS.
    :param unwrap_single: If True, unwrap a single-element result list into a plain string value
        for backward compatibility. If False, always return a list of GCS URIs.
        If not explicitly provided, defaults to True and emits a FutureWarning that
        the default will change to False in a future release.
    """

    template_fields: Sequence[str] = (
        "query",
        "bucket_name",
        "object_name",
    )
    template_ext: Sequence[str] = (".sql",)
    template_fields_renderers = {"sql": "sql"}

    def __init__(
        self,
        *,
        query: str,
        bucket_name: str,
        object_name: str,
        salesforce_conn_id: str,
        include_deleted: bool = False,
        query_params: dict | None = None,
        export_format: str = "csv",
        coerce_to_timestamp: bool = False,
        record_time_added: bool = False,
        gzip: bool = False,
        gcp_conn_id: str = "google_cloud_default",
        unwrap_single: bool | None = None,
        **kwargs,
    ):
        super().__init__(**kwargs)
        self.query = query
        self.bucket_name = bucket_name
        self.object_name = object_name
        self.salesforce_conn_id = salesforce_conn_id
        self.export_format = export_format
        self.coerce_to_timestamp = coerce_to_timestamp
        self.record_time_added = record_time_added
        self.gzip = gzip
        self.gcp_conn_id = gcp_conn_id
        self.include_deleted = include_deleted
        self.query_params = query_params
        if unwrap_single is None:
            warnings.warn(
                "Returning a list of Salesforce FileShare filenames from SalesforceToGcsOperator is deprecated and "
                "will change to list[str] of GCS URIs in a future release. Set unwrap_single=True to opt in.",
                FutureWarning,
                stacklevel=2,
            )
            unwrap_single = True
        else:
            self.unwrap_single = unwrap_single

    def execute(self, context: Context) -> str | list[str]:
        salesforce = SalesforceHook(salesforce_conn_id=self.salesforce_conn_id)
        response = salesforce.make_query(
            query=self.query, include_deleted=self.include_deleted, query_params=self.query_params
        )

        with tempfile.TemporaryDirectory() as tmp:
            path = os.path.join(tmp, "salesforce_temp_file")
            salesforce.write_object_to_file(
                query_results=response["records"],
                filename=path,
                fmt=self.export_format,
                coerce_to_timestamp=self.coerce_to_timestamp,
                record_time_added=self.record_time_added,
            )

            hook = GCSHook(gcp_conn_id=self.gcp_conn_id)
            hook.upload(
                bucket_name=self.bucket_name,
                object_name=self.object_name,
                filename=path,
                gzip=self.gzip,
            )

            gcs_uri = f"gs://{self.bucket_name}/{self.object_name}"
            self.log.info("%s uploaded to GCS", gcs_uri)

            if self.unwrap_single:
                return gcs_uri
            return [gcs_uri]
