#!/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
import projectlib.aws
import jmespath

def getVolumeSize(region_name: str, id: str) -> int:
    client = boto3.client('ec2', region_name=region_name)
    response = client.describe_volumes(VolumeIds=[id])
    return response['Volumes'][0]['Size']

def getResources(region_name: str) -> list[list[str | int]]:
    return_data = []
    client = boto3.client('ec2', region_name=region_name)
    paginator = client.get_paginator('describe_instances')
    for page in paginator.paginate():
        for r in page['Reservations']:
            for i in r['Instances']:
                name_tag = jmespath.search("Tags[?Key=='Name'] | [0].Value", i)
                rootVolSize = getVolumeSize(region_name=region_name, id=i['BlockDeviceMappings'][0]['Ebs']['VolumeId'])
                return_data.append([i['InstanceId'], name_tag, i.get('PlatformDetails'), i['InstanceType'], i['PrivateIpAddress'], rootVolSize, i['Placement']['AvailabilityZone']])
    return return_data

# Main function
def main() -> None:
    # Open spreadsheet and add a sheet
    wb = load_workbook('aws-inventory.xlsx')
    ws = wb.create_sheet("Ec2")

    ws.append(["InstanceId","NameTag","Platform","InstanceType","PrivateIpAddress","RootVolumeSize", "AZ"])
    with concurrent.futures.ThreadPoolExecutor(max_workers=8) as executor:
        results = executor.map(getResources, projectlib.aws.getRegions())
        for region_rows in results:
            # append to worksheet only if resources are found in the region
            if region_rows:
                for row in region_rows:
                    ws.append(row)

    wb.save('aws-inventory.xlsx')
    
# Call main function
if __name__ == '__main__':
    main()