import psutil
import shutil
import os
import argparse
import sys

# Validating arguments
parser = argparse.ArgumentParser()
parser.add_argument('--maximum-backup-size-percent', type=int, dest='maximum_backup_size_percent',required=True, choices=range(0,100), help="The directory from which the data should be encrypted.")
parser.add_argument('--backups-folder-path',type=str,dest='backups_folder_path',required=True, help="The folder in which the backups are stored")
args = parser.parse_args()

def print_used_disc_space():
    print("%d %% of disk %s are used" % (psutil.disk_usage(args.backups_folder_path).percent,args.backups_folder_path))  
    
warning_counter=0

for host_backup_directory_name in os.listdir(args.backups_folder_path):
    host_backup_directory_path = os.path.join(args.backups_folder_path, host_backup_directory_name)
    for application_directory in os.listdir(host_backup_directory_path):
        
        # The directory which contains all backup versions of the application
        versions_directory = os.path.join(host_backup_directory_path, application_directory) + "/"
                    
        versions = os.listdir(versions_directory)
        versions.sort(reverse=False)
        versions_counter=len(versions)
        
        print_used_disc_space()  
        for version in versions:
            version_path=os.path.join(versions_directory, version)
            version_status_pulling_path=os.path.join(versions_directory, version, ".pulling")
            print("Checking directory %s ..." % (version_path))
            if psutil.disk_usage(args.backups_folder_path).percent > args.maximum_backup_size_percent:
                if versions_counter >= 1:
                    print("Deleting %s to free space" % (version_path))
                    shutil.rmtree(version_path)
                    versions_counter-=1
                else:
                    print("Deletion not possible. There needs to be at least one backup version")
                    warning_counter+=1
            elif os.path.exists(version_status_pulling_path):
                last_version=versions[-1]
                if last_version != version:
                    print("Deleting %s due to unfinished pull" % (version_path))
                    shutil.rmtree(version_path)
                    versions_counter-=1
print_used_disc_space()            
print("Cleaning up finished.")
sys.exit(warning_counter)