# -*- coding: utf-8 -*-
#
# Licensed 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 airflow.contrib.hooks.gcs_hook import GoogleCloudStorageHook
from airflow.models import BaseOperator
import os


class FileToGoogleCloudStorageOperator(BaseOperator):
    """
    Uploads a file to Google Cloud Storage
    """

    def __init__(self,
                 src,
                 dst,
                 bucket,
                 google_cloud_storage_conn_id='google_cloud_storage_default',
                 mime_type='application/octet-stream',
                 delegate_to=None,
                 *args,
                 **kwargs):
        """
        :param src: Path to the local file
        :type src: string
        :param dst: Destination path within the specified bucket
        :type dst: string
        :param bucket: The bucket to upload to
        :type bucket: string
        :param google_cloud_storage_conn_id: The Airflow connection ID to upload with
        :type google_cloud_storage_conn_id: string
        :param mime_type: The mime-type string
        :type mime_type: string
        :param delegate_to: The account to impersonate, if any
        :type delegate_to: string
        """
        super(FileToGoogleCloudStorageOperator, self).__init__(*args, **kwargs)
        self.src = src
        self.dst = dst
        self.bucket = bucket
        self.google_cloud_storage_conn_id = google_cloud_storage_conn_id
        self.mime_type = mime_type
        self.delegate_to = delegate_to

    def execute(self, context):
        """
        Uploads the file to Google cloud storage
        """
        hook = GoogleCloudStorageHook(
                google_cloud_storage_conn_id=self.google_cloud_storage_conn_id,
                delegate_to=self.delegate_to)

        hook.upload(
            bucket=self.bucket,
            object=self.dst,
            mime_type=self.mime_type,
            filename=self.src)

Add file to GCS operator
[AIRFLOW-125] Add file to GCS operator

Adds an operator to upload a file to Google Cloud Storage. Used as follows:
```py
from airflow.contrib.operators.file_to_gcs import FileToGoogleCloudStorageOperator
gcs = FileToGoogleCloudStorageOperator(
        bucket='a-bucket-i-have-access-to-on-gcs',
        dag=dag,
        task_id='upload_stuff',
        google_cloud_storage_conn_id='an-airflow-bigquery-connection',
        src=os.path.join(os.path.dirname(__file__), 'csv/some_file.csv'),
        dst='project/some_file.csv')
```
