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import json
import boto3
import re
import io
from io import StringIO
import pandas as pd
##add trigger window from extract bucket (on console?)
##suffix: must .csv --> reads only this file type that is uploaded to extract
##In-order to use PANDAS module in lambda function, a Lambda Layer needs to be attached to the AWS Lambda Function.
##need a function that normalises the data
s3_resource = boto3.resource('s3') ##need this for a way of reuploading data after transformation
def lambda_handler(event, context):
s3_client = boto3.client('s3')
# tables = ['sales_order',
# 'transaction',
# 'payment',
# 'counterparty',
# 'address',
# 'staff',
# 'purchase_order',
# 'department',
# 'currency',
# 'design',
# 'payment_type']
try:
s3_bucket_name = event["Records"][0]["s3"]["bucket"]["name"]
s3_file_name = event["Records"][0]["s3"]["object"]["key"]
## concatanating the file per table - most recent
## iterate through the subfolders
## table name prefix to iterate through the files written to that table
object = s3_client.get_object(Bucket=s3_bucket_name, Key=s3_file_name)
body = object['Body']
csv_string = body.read().decode('utf-8')
dataframe = pd.read_csv(StringIO(csv_string)) ##this is the streaming body
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