#!/usr/bin/python

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# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
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import logging
import json
import sys
import dlab.fab
import dlab.actions_lib
import dlab.meta_lib
import os
import uuid
import traceback


def terminate_nb(resource_group_name, notebook_name):
    print("Terminating data engine cluster")
    try:
        for vm in AzureMeta.compute_client.virtual_machines.list(resource_group_name):
            if "notebook_name" in vm.tags:
                if notebook_name == vm.tags['notebook_name']:
                    AzureActions.remove_instance(resource_group_name, vm.name)
                    print("Instance {} has been terminated".format(vm.name))
    except Exception as err:
        dlab.fab.append_result("Failed to terminate clusters", str(err))
        sys.exit(1)

    print("Terminating notebook")
    try:
        for vm in AzureMeta.compute_client.virtual_machines.list(resource_group_name):
            if "Name" in vm.tags:
                if notebook_name == vm.tags["Name"]:
                    AzureActions.remove_instance(resource_group_name, vm.name)
                    print("Instance {} has been terminated".format(vm.name))
    except Exception as err:
        dlab.fab.append_result("Failed to terminate instance", str(err))
        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
    AzureMeta = dlab.meta_lib.AzureMeta()
    AzureActions = dlab.actions_lib.AzureActions()
    print('Generating infrastructure names and tags')
    notebook_config = dict()
    if 'exploratory_name' in os.environ:
        notebook_config['exploratory_name'] = os.environ['exploratory_name']
    else:
        notebook_config['exploratory_name'] = ''
    if 'computational_name' in os.environ:
        notebook_config['computational_name'] = os.environ['computational_name']
    else:
        notebook_config['computational_name'] = ''
    notebook_config['resource_group_name'] = os.environ['azure_resource_group_name']
    notebook_config['notebook_name'] = os.environ['notebook_instance_name']

    try:
        logging.info('[TERMINATE NOTEBOOK]')
        print('[TERMINATE NOTEBOOK]')
        try:
            terminate_nb(notebook_config['resource_group_name'], notebook_config['notebook_name'])
        except Exception as err:
            traceback.print_exc()
            dlab.fab.append_result("Failed to terminate notebook.", str(err))
            raise Exception
    except:
        sys.exit(1)

    try:
        with open("/root/result.json", 'w') as result:
            res = {"notebook_name": notebook_config['notebook_name'],
                   "Action": "Terminate 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)