import boto3
import io

from typing import Union
from lib.application_configs import ApplicationConfigs

session = boto3.Session(
    aws_access_key_id=ApplicationConfigs.aws_access_key_id,
    aws_secret_access_key=ApplicationConfigs.aws_secret_key)

# ToDo: Figure out a much better way of doing this.
# LocalStack wants endpoint_url, while prod doesnt :(
if ApplicationConfigs.local_dev_env:
    s3 = session.client('s3', region_name=ApplicationConfigs.region_name, endpoint_url=ApplicationConfigs.endpoint_url)
    sqs = session.client('sqs', region_name=ApplicationConfigs.region_name, endpoint_url=ApplicationConfigs.endpoint_url)
else:
    s3 = session.client('s3', region_name=ApplicationConfigs.region_name)
    sqs = session.client('sqs', region_name=ApplicationConfigs.region_name)

def get_key_from_message(body: dict) -> str:
    return body['Records'][0]['s3']['object']['key']

def get_bucket_from_message(body: dict) -> str:
    return body['Records'][0]['s3']['bucket']['name']

def get_object(key: str, bucket: str) -> bytes:
    return s3.get_object(
        Bucket=bucket,
        Key=key,
    )['Body'].read()

def get_object_tag(key: str, bucket: str, tag_key: str) -> Union[str, None]:
    tags = get_object_tags(key, bucket)
    return next((tag for tag in tags if tag['Key'] == tag_key), None)

def get_object_tags(key: str, bucket: str) -> list:
    tags = s3.get_object_tagging(Bucket=bucket, Key=key)['TagSet']
    return tags

def file_stream_upload(buffer: io.BytesIO, name: str, bucket: str, action: str = None):
    return s3.upload_fileobj(buffer, bucket, name, ExtraArgs={'Tagging': f'action={action}'})