import sys
import time
import utils
import longvideo_config
import logging

logging.basicConfig(level=logging.INFO,
                    format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
                    datefmt='%a, %d %b %Y %H:%M:%S')


def remove_instances(create_client, slb_client, instance_ids):
    """
    停止并释放机器
    :param create_client:
    :param slb_client:
    :param instance_ids: instanceId type-list
    :return: None
    """
    # 1. 摘流量
    utils.set_instance_weight_process_with_slbs(client=slb_client,
                                                slb_id_list=longvideo_config.slb_id_list,
                                                instance_id_list=instance_ids,
                                                weight_list=[(0, 20)])
    logging.info(f"set weight = 0 finished, instances: {instance_ids}")
    time.sleep(10)
    # 2.移除slb
    utils.remove_backend_servers_with_slbs(client=slb_client,
                                           slb_id_list=longvideo_config.slb_id_list,
                                           instances=instance_ids)
    # 3. 停止机器
    utils.stop_instances(client=create_client, instance_ids=instance_ids)
    logging.info(f"instances stop finished, instances: {instance_ids}")
    # 4. 判断机器运行状态是否为Stopped
    while True:
        response = utils.get_instances_status(client=create_client, instance_ids=instance_ids)
        if response.get('Code') is None:
            instances_list = response.get('InstanceStatuses').get('InstanceStatus')
            # logging.info(instances_list)
            stopped_instances = [instance.get('InstanceId') for instance in instances_list
                                 if instance.get('Status') == 'Stopped']
            if len(stopped_instances) == len(instance_ids):
                logging.info(f"instances stopped status set success, instances: {stopped_instances}")
                break
            else:
                logging.info(f"stopped instances count = {len(stopped_instances)}, instances: {stopped_instances}")
                time.sleep(5)
        else:
            logging.error(response)
            sys.exit()
    # 5. 释放机器
    response = utils.release_instances(client=create_client, instance_ids=stopped_instances)
    if response.get('Code') is None:
        logging.info(f"release instances finished, instances: {stopped_instances}")
    else:
        logging.error(f"release instances fail!!!")
        sys.exit()


def main():
    try:
        slb_client = utils.connect_client(
            access_key_id=longvideo_config.slb_client_params['access_key_id'],
            access_key_secret=longvideo_config.slb_client_params['access_key_secret'],
            region_id=longvideo_config.slb_client_params['region_id']
        )
        create_client = utils.connect_client(
            access_key_id=longvideo_config.create_client_params['access_key_id'],
            access_key_secret=longvideo_config.create_client_params['access_key_secret'],
            region_id=longvideo_config.create_client_params['region_id']
        )

        # 获取指定释放的机器数量
        reduce_count = int(sys.argv[1])
        logging.info(f"reduce instances count: {reduce_count}")

        # 获取slb下所有机器
        online_instance_ids = utils.get_instance_ids(client=slb_client, slb_id=longvideo_config.slb_id_list[0])
        online_instance_count = len(online_instance_ids)
        logging.info(f"online instance count: {online_instance_count}.")
        logging.info(f"online instance ids: {online_instance_ids}")

        # 获取前count台机器进行释放
        reduce_instance_ids = online_instance_ids[:reduce_count]
        logging.info(f"reduce instances: {reduce_instance_ids}")

        # 停止并释放机器
        remove_instances(create_client=create_client, slb_client=slb_client, instance_ids=reduce_instance_ids)
        logging.info(f"stop & release instances end!")
    except Exception as e:
        logging.error(e)
        sys.exit()


if __name__ == '__main__':
    main()