# Automated AMI and Snapshot Deletion
#
# @author Bobby Kozora
#
# This script will search for all instances having a tag named "Backup" with a value of "Backup".
# As soon as we have the instances list, we loop through each instance
# and reference the AMIs of that instance. We check that the latest daily backup
# succeeded then we store every image that's reached its DeleteOn tag's date for
# deletion. We then loop through the AMIs, deregister them and remove all the
# snapshots associated with that AMI.

import boto3
import collections
import datetime
import time
import sys

ec = boto3.client('ec2', 'us-east-1')
ec2 = boto3.resource('ec2', 'us-east-1')
images = ec2.images.filter(Owners=["self"])


def lambda_handler(event, context):

    reservations = ec.describe_instances(Filters=[
        {
            'Name': 'tag-key',
            'Values': ['backup', 'Backup']
        },
    ]).get('Reservations', [])

    instances = sum([[i for i in r['Instances']] for r in reservations], [])

    print("Found %d instances that need evaluated" % len(instances))

    to_tag = collections.defaultdict(list)

    date = datetime.datetime.now()
    date_fmt = date.strftime('%Y-%m-%d')

    imagesList = []

    # Set to true once we confirm we have a backup taken today
    backupSuccess = False

    # Loop through all of our instances with a tag named "Backup"
    for instance in instances:
        imagecount = 0

        # Loop through each image of our current instance
        for image in images:

            # Our other Lambda Function names its AMIs Lambda - i-instancenumber.
            # We now know these images are auto created
            if image.name.startswith('Lambda - ' + instance['InstanceId']):

                # print "FOUND IMAGE " + image.id + " FOR INSTANCE " + instance['InstanceId']

                # Count this image's occcurance
                imagecount = imagecount + 1

                try:
                    if image.tags is not None:
                        deletion_date = [
                            t.get('Value') for t in image.tags
                            if t['Key'] == 'DeleteOn'
                        ][0]
                        delete_date = time.strptime(deletion_date, "%m-%d-%Y")
                except IndexError:
                    deletion_date = False
                    delete_date = False

                today_time = datetime.datetime.now().strftime('%m-%d-%Y')
                # today_fmt = today_time.strftime('%m-%d-%Y')
                today_date = time.strptime(today_time, '%m-%d-%Y')

                # If image's DeleteOn date is less than or equal to today,
                # add this image to our list of images to process later
                if delete_date <= today_date:
                    imagesList.append(image.id)

                # Make sure we have an AMI from today and mark backupSuccess as true
                if image.name.endswith(date_fmt):
                    # Our latest backup from our other Lambda Function succeeded
                    backupSuccess = True
                    print("Latest backup from " + date_fmt + " was a success")

        print("instance " + instance['InstanceId'] + " has " +
              str(imagecount) + " AMIs")

    print("=============")

    print("About to process the following AMIs:")
    print(imagesList)

    if backupSuccess == True:

        myAccount = boto3.client('sts').get_caller_identity()['Account']
        snapshots = ec.describe_snapshots(MaxResults=1000,
                                          OwnerIds=[myAccount])['Snapshots']

        # loop through list of image IDs
        for image in imagesList:
            print("deregistering image %s" % image)
            amiResponse = ec.deregister_image(
                DryRun=False,
                ImageId=image,
            )

            for snapshot in snapshots:
                if snapshot['Description'].find(image) > 0:
                    snap = ec.delete_snapshot(
                        SnapshotId=snapshot['SnapshotId'])
                    print("Deleting snapshot " + snapshot['SnapshotId'])
                    print("-------------")

    else:
        print("No current backup found. Termination suspended.")