#!/usr/bin/python

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# to you under the Apache License, Version 2.0 (the
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import logging
import json
import sys
import dlab.fab
import dlab.actions_lib
import dlab.meta_lib
from fabric.api import *
import traceback
import os
import uuid
import boto3
import argparse
import sys


def stop_notebook(nb_tag_value, bucket_name, tag_name, ssh_user, key_path):
    print('Terminating EMR cluster and cleaning EMR config from S3 bucket')
    try:
        clusters_list = dlab.meta_lib.get_emr_list(nb_tag_value, 'Value')
        if clusters_list:
            for cluster_id in clusters_list:
                computational_name = ''
                client = boto3.client('emr')
                cluster = client.describe_cluster(ClusterId=cluster_id)
                cluster = cluster.get("Cluster")
                emr_name = cluster.get('Name')
                emr_version = cluster.get('ReleaseLabel')
                for tag in cluster.get('Tags'):
                    if tag.get('Key') == 'ComputationalName':
                        computational_name = tag.get('Value')
                dlab.actions_lib.s3_cleanup(bucket_name, emr_name, os.environ['project_name'])
                print("The bucket {} has been cleaned successfully".format(bucket_name))
                dlab.actions_lib.terminate_emr(cluster_id)
                print("The EMR cluster {} has been terminated successfully".format(emr_name))
                dlab.actions_lib.remove_kernels(emr_name, tag_name, nb_tag_value, ssh_user, key_path, emr_version,
                                                computational_name)
                print("{} kernels have been removed from notebook successfully".format(emr_name))
        else:
            print("There are no EMR clusters to terminate.")
    except:
        sys.exit(1)

    print("Stopping data engine cluster")
    try:
        cluster_list = []
        master_ids = []
        cluster_instances_list = dlab.meta_lib.get_ec2_list('dataengine_notebook_name', nb_tag_value)
        for instance in cluster_instances_list:
            for tag in instance.tags:
                if tag['Key'] == 'Type' and tag['Value'] == 'master':
                    master_ids.append(instance.id)
        for id in master_ids:
            for tag in dlab.meta_lib.get_instance_attr(id, 'tags'):
                if tag['Key'] == 'Name':
                    cluster_list.append(tag['Value'].replace(' ', '')[:-2])
        dlab.actions_lib.stop_ec2('dataengine_notebook_name', nb_tag_value)
    except:
        sys.exit(1)

    print("Stopping notebook")
    try:
        dlab.actions_lib.stop_ec2(tag_name, nb_tag_value)
    except:
        sys.exit(1)


if __name__ == "__main__":
    local_log_filename = "{}_{}_{}.log".format(os.environ['conf_resource'], os.environ['project_name'],
                                               os.environ['request_id'])
    local_log_filepath = "/logs/" + os.environ['conf_resource'] + "/" + local_log_filename
    logging.basicConfig(format='%(levelname)-8s [%(asctime)s]  %(message)s',
                        level=logging.DEBUG,
                        filename=local_log_filepath)

    # generating variables dictionary
    dlab.actions_lib.create_aws_config_files()
    print('Generating infrastructure names and tags')
    notebook_config = dict()
    notebook_config['service_base_name'] = (os.environ['conf_service_base_name'])
    notebook_config['notebook_name'] = os.environ['notebook_instance_name']
    notebook_config['project_name'] = os.environ['project_name']
    notebook_config['endpoint_name'] = os.environ['endpoint_name']
    notebook_config['bucket_name'] = '{0}-{1}-{2}-bucket'.format(notebook_config['service_base_name'],
                                                                  notebook_config['project_name'],
                                                                  notebook_config['endpoint_name']
                                                                 ).lower().replace('_', '-')
    notebook_config['tag_name'] = notebook_config['service_base_name'] + '-tag'
    notebook_config['key_path'] = os.environ['conf_key_dir'] + '/' + os.environ['conf_key_name'] + '.pem'

    logging.info('[STOP NOTEBOOK]')
    print('[STOP NOTEBOOK]')
    try:
        stop_notebook(notebook_config['notebook_name'], notebook_config['bucket_name'], notebook_config['tag_name'],
                      os.environ['conf_os_user'], notebook_config['key_path'])
    except Exception as err:
        print('Error: {0}'.format(err))
        dlab.fab.append_result("Failed to stop notebook.", str(err))
        sys.exit(1)


    try:
        with open("/root/result.json", 'w') as result:
            res = {"notebook_name": notebook_config['notebook_name'],
                   "Tag_name": notebook_config['tag_name'],
                   "user_own_bucket_name": notebook_config['bucket_name'],
                   "Action": "Stop notebook server"}
            print(json.dumps(res))
            result.write(json.dumps(res))
    except Exception as err:
        dlab.fab.append_result("Error with writing results", str(err))
        sys.exit(1)