#!/usr/bin/env python3
r"""
Documentation

License: This program is released under the MIT License
"""

# Imports
import boto3
import concurrent.futures
from openpyxl import load_workbook
from openpyxl.worksheet.worksheet import Worksheet


def getRegions(all_regions=False):
    ec2 = boto3.client('ec2')
    response = ec2.describe_regions(AllRegions=all_regions)
    return [region['RegionName'] for region in response['Regions']]

def printResources(region_name: str) -> list[list[str | int]]:
    return_data = []
    client = boto3.client('rds', region_name=region_name)
    response = client.describe_db_instances()
    for i in response['DBInstances']:
        return_data.append([i['DBInstanceIdentifier'], i['DBInstanceClass'], i['Engine'], i['EngineVersion'], i['MultiAZ'], region_name])
    return return_data

# Main function
def main() -> None:
    # Open spreadsheet and add a sheet
    wb = load_workbook('aws-inventory.xlsx')
    ws = wb.create_sheet("RDS")

    final_data = []
    ws.append(["DBInstanceIdentifier", "DBInstanceClass", "Engine", "EngineVersion", "MultiAZ", "Region"])
    with concurrent.futures.ProcessPoolExecutor(max_workers=6) as executor:
        futures = [executor.submit(printResources, region_name=r) for r in getRegions()]
        for future in concurrent.futures.as_completed(futures):
            region_data = future.result()
            final_data.extend(region_data)

    clean_data = [row for row in final_data if row]
    for row in clean_data:
        ws.append(row)

    wb.save('aws-inventory.xlsx')

# Call main function
if __name__ == '__main__':
    main()