import os
import boto3
from PIL import Image
from io import BytesIO

class AwsService:
  def session():
    return boto3.Session(
      aws_access_key_id = os.environ.get('AWS_ACCESS_KEY_ID'),
      aws_secret_access_key = os.environ.get('AWS_SECRET_ACCESS_KEY'),
      region_name=os.environ.get('AWS_REGION')
    )
  
  def s3_client():
    return AwsService.session().client('s3')     

  def get_files_from_s3(bucket, prefix):
    results = AwsService.s3_client().list_objects(Bucket=bucket, Prefix=prefix)
    if 'Contents' in results:
      return results['Contents']
    else:
      return []
  
  def get_image_from_s3(bucket, key):
    file_byte_string = AwsService.s3_client().get_object(Bucket=bucket, Key=key)['Body'].read()
    return {
      'key': key.split('/')[-1].split('.')[0],
      'pil': Image.open(BytesIO(file_byte_string))
    }
  
  def send_image_to_s3(file, bucket, key):
    return AwsService.s3_client().upload_file(file, bucket, key, ExtraArgs={'ACL':'public-read', 'ContentType': 'image/png'})