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# encoding:utf-8

import boto3
import json
import os
from datetime import datetime, timedelta, timezone

def lambda_handler(event, context):
    # 現在時刻
    UTC = timezone(timedelta(hours=+0), 'UTC')
    now = datetime.now(UTC)

    # 期限
    limit_hour = int(os.environ["limit_hour"])

    # 対象インスタンスの取得
    ec2 = boto3.resource("ec2")
    result = ec2.instances.filter(
        Filters=[{
            "Name": "tag:limit_instance",
            "Values": ["true"]
        }]
    )

    # 起動中のインスタンスがあればチェック
    for i in [i for i in result if i.state["Name"] == "running"]:
        print("Instance ID [{0}] Launch Time [{1}]".format(i.instance_id, i.launch_time)) 

        # 予定時間を過ぎている場合は削除
        if (i.launch_time + timedelta(hours=limit_hour)) < now:
            print("Instance ID [{0}] Limit".format(i.instance_id))
            print(ec2.instances.filter(InstanceIds=[i.instance_id]).terminate())
        else:
            print("Instance ID [{0}] Not Limit".format(i.instance_id))

    return "success"