#!/usr/bin/env python3

import requests
import argparse
import jwt
import sys
import json
import time


def get_installation_id(jwt_token):
    headers = {
        "Authorization": f"Bearer {jwt_token}",
        "Accept": "application/vnd.github.v3+json",
    }
    response = requests.get("https://api.github.com/app/installations", headers=headers)
    response.raise_for_status()
    data = response.json()
    for installation in data:
        if installation["account"]["login"] == "ClickHouse":
            installation_id = installation["id"]
    return installation_id


def get_access_token(jwt_token, installation_id):
    headers = {
        "Authorization": f"Bearer {jwt_token}",
        "Accept": "application/vnd.github.v3+json",
    }
    response = requests.post(
        f"https://api.github.com/app/installations/{installation_id}/access_tokens",
        headers=headers,
    )
    response.raise_for_status()
    data = response.json()
    return data["token"]


def get_runner_registration_token(access_token):
    headers = {
        "Authorization": f"token {access_token}",
        "Accept": "application/vnd.github.v3+json",
    }
    response = requests.post(
        "https://api.github.com/orgs/ClickHouse/actions/runners/registration-token",
        headers=headers,
    )
    response.raise_for_status()
    data = response.json()
    return data["token"]


def get_key_and_app_from_aws():
    import boto3

    secret_name = "clickhouse_github_secret_key"
    session = boto3.session.Session()
    client = session.client(
        service_name="secretsmanager",
    )
    get_secret_value_response = client.get_secret_value(SecretId=secret_name)
    data = json.loads(get_secret_value_response["SecretString"])
    return data["clickhouse-app-key"], int(data["clickhouse-app-id"])


def main(github_secret_key, github_app_id, push_to_ssm, ssm_parameter_name):
    payload = {
        "iat": int(time.time()) - 60,
        "exp": int(time.time()) + (10 * 60),
        "iss": github_app_id,
    }

    encoded_jwt = jwt.encode(payload, github_secret_key, algorithm="RS256")
    installation_id = get_installation_id(encoded_jwt)
    access_token = get_access_token(encoded_jwt, installation_id)
    runner_registration_token = get_runner_registration_token(access_token)

    if push_to_ssm:
        import boto3

        print("Trying to put params into ssm manager")
        client = boto3.client("ssm")
        client.put_parameter(
            Name=ssm_parameter_name,
            Value=runner_registration_token,
            Type="SecureString",
            Overwrite=True,
        )
    else:
        print(
            "Not push token to AWS Parameter Store, just print:",
            runner_registration_token,
        )


def handler(event, context):
    private_key, app_id = get_key_and_app_from_aws()
    main(private_key, app_id, True, "github_runner_registration_token")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description="Get new token from github to add runners"
    )
    parser.add_argument(
        "-p", "--private-key-path", help="Path to file with private key"
    )
    parser.add_argument("-k", "--private-key", help="Private key")
    parser.add_argument(
        "-a", "--app-id", type=int, help="GitHub application ID", required=True
    )
    parser.add_argument(
        "--push-to-ssm",
        action="store_true",
        help="Store received token in parameter store",
    )
    parser.add_argument(
        "--ssm-parameter-name",
        default="github_runner_registration_token",
        help="AWS paramater store parameter name",
    )

    args = parser.parse_args()

    if not args.private_key_path and not args.private_key:
        print(
            "Either --private-key-path or --private-key must be specified",
            file=sys.stderr,
        )

    if args.private_key_path and args.private_key:
        print(
            "Either --private-key-path or --private-key must be specified",
            file=sys.stderr,
        )

    if args.private_key:
        private_key = args.private_key
    else:
        with open(args.private_key_path, "r") as key_file:
            private_key = key_file.read()

    main(private_key, args.app_id, args.push_to_ssm, args.ssm_parameter_name)