#!/usr/bin/python

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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
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# 
#   http://www.apache.org/licenses/LICENSE-2.0
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import logging
import json
import sys
from dlab.fab import *
from dlab.meta_lib import *
from dlab.actions_lib import *
import os
import traceback


if __name__ == "__main__":
    instance_class = 'notebook'
    local_log_filename = "{}_{}_{}.log".format(os.environ['conf_resource'], os.environ['edge_user_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)

    notebook_config = dict()
    try:
        notebook_config['exploratory_name'] = (os.environ['exploratory_name']).lower().replace('_', '-')
    except:
        notebook_config['exploratory_name'] = ''
    notebook_config['service_base_name'] = (os.environ['conf_service_base_name']).lower().replace('_', '-')
    notebook_config['instance_type'] = os.environ['gcp_notebook_instance_size']
    notebook_config['key_name'] = os.environ['conf_key_name']
    notebook_config['edge_user_name'] = (os.environ['edge_user_name']).lower().replace('_', '-')
    notebook_config['instance_name'] = '{0}-{1}-nb-{2}'.format(notebook_config['service_base_name'],
                                                               notebook_config['edge_user_name'],
                                                               notebook_config['exploratory_name'])

    # generating variables regarding EDGE proxy on Notebook instance
    instance_hostname = GCPMeta().get_private_ip_address(notebook_config['instance_name'])
    edge_instance_name = '{0}-{1}-edge'.format(notebook_config['service_base_name'], notebook_config['edge_user_name'])
    notebook_config['ssh_key_path'] = '{0}{1}.pem'.format(os.environ['conf_key_dir'], os.environ['conf_key_name'])
    notebook_config['dlab_ssh_user'] = os.environ['conf_os_user']
    notebook_config['zone'] = os.environ['gcp_zone']

    try:
        if os.environ['conf_os_family'] == 'debian':
            initial_user = 'ubuntu'
            sudo_group = 'sudo'
        if os.environ['conf_os_family'] == 'redhat':
            initial_user = 'ec2-user'
            sudo_group = 'wheel'

        logging.info('[CREATING DLAB SSH USER]')
        print('[CREATING DLAB SSH USER]')
        params = "--hostname {} --keyfile {} --initial_user {} --os_user {} --sudo_group {}".format\
            (instance_hostname, notebook_config['ssh_key_path'], initial_user,
             notebook_config['dlab_ssh_user'], sudo_group)

        try:
            local("~/scripts/{}.py {}".format('create_ssh_user', params))
        except:
            traceback.print_exc()
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed creating ssh user 'dlab'.", str(err))
        GCPActions().remove_instance(notebook_config['instance_name'], notebook_config['zone'])
        sys.exit(1)

    # configuring proxy on Notebook instance
    try:
        logging.info('[CONFIGURE PROXY ON ZEPPELIN INSTANCE]')
        print('[CONFIGURE PROXY ON ZEPPELIN INSTANCE]')
        additional_config = {"proxy_host": edge_instance_name, "proxy_port": "3128"}
        params = "--hostname {} --instance_name {} --keyfile {} --additional_config '{}' --os_user {}" \
            .format(instance_hostname, notebook_config['instance_name'], notebook_config['ssh_key_path'],
                    json.dumps(additional_config), notebook_config['dlab_ssh_user'])
        try:
            local("~/scripts/{}.py {}".format('common_configure_proxy', params))
        except:
            traceback.print_exc()
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed to configure proxy.", str(err))
        GCPActions().remove_instance(notebook_config['instance_name'], notebook_config['zone'])
        sys.exit(1)

    # updating repositories & installing python packages
    try:
        logging.info('[INSTALLING PREREQUISITES TO ZEPPELIN NOTEBOOK INSTANCE]')
        print('[INSTALLING PREREQUISITES TO ZEPPELIN NOTEBOOK INSTANCE]')
        params = "--hostname {} --keyfile {} --user {} --region {}". \
            format(instance_hostname, notebook_config['ssh_key_path'], notebook_config['dlab_ssh_user'],
                   os.environ['gcp_region'])
        try:
            local("~/scripts/{}.py {}".format('install_prerequisites', params))
        except:
            traceback.print_exc()
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed installing apps: apt & pip.", str(err))
        GCPActions().remove_instance(notebook_config['instance_name'], notebook_config['zone'])
        sys.exit(1)

    # installing and configuring zeppelin and all dependencies
    try:
        logging.info('[CONFIGURE ZEPPELIN NOTEBOOK INSTANCE]')
        print('[CONFIGURE ZEPPELIN NOTEBOOK INSTANCE]')
        additional_config = {"frontend_hostname": edge_instance_name,
                             "backend_hostname": instance_hostname,
                             "backend_port": "8080",
                             "nginx_template_dir": "/root/templates/"}
        params = "--hostname {} --instance_name {} " \
                 "--keyfile {} --region {} " \
                 "--additional_config '{}' --os_user {} " \
                 "--spark_version {} --hadoop_version {} " \
                 "--edge_hostname {} --proxy_port {} " \
                 "--zeppelin_version {} --scala_version {} " \
                 "--livy_version {} --multiple_clusters {} " \
                 "--r_mirror {} --endpoint_url {} " \
                 "--exploratory_name {}" \
            .format(instance_hostname, notebook_config['instance_name'], notebook_config['ssh_key_path'], os.environ['gcp_region'],
                    json.dumps(additional_config), notebook_config['dlab_ssh_user'], os.environ['notebook_spark_version'],
                    os.environ['notebook_hadoop_version'], edge_instance_name, '3128',
                    os.environ['notebook_zeppelin_version'], os.environ['notebook_scala_version'],
                    os.environ['notebook_livy_version'], os.environ['notebook_multiple_clusters'],
                    os.environ['notebook_r_mirror'], 'null',
                    notebook_config['exploratory_name'])
        try:
            local("~/scripts/{}.py {}".format('configure_zeppelin_node', params))
        except:
            traceback.print_exc()
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed to configure zeppelin.", str(err))
        GCPActions().remove_instance(notebook_config['instance_name'], notebook_config['zone'])
        sys.exit(1)

    try:
        print('[INSTALLING USERs KEY]')
        logging.info('[INSTALLING USERs KEY]')
        additional_config = {"user_keyname": os.environ['edge_user_name'],
                             "user_keydir": os.environ['conf_key_dir']}
        params = "--hostname {} --keyfile {} --additional_config '{}' --user {}".format(
            instance_hostname, notebook_config['ssh_key_path'], json.dumps(additional_config),
            notebook_config['dlab_ssh_user'])
        try:
            local("~/scripts/{}.py {}".format('install_user_key', params))
        except:
            append_result("Failed installing users key")
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed installing users key.", str(err))
        GCPActions().remove_instance(notebook_config['instance_name'], notebook_config['zone'])
        sys.exit(1)

    try:
        print('[SETUP USER GIT CREDENTIALS]')
        logging.info('[SETUP USER GIT CREDENTIALS]')
        params = '--os_user {} --notebook_ip {} --keyfile "{}"' \
            .format(notebook_config['dlab_ssh_user'], instance_hostname, notebook_config['ssh_key_path'])
        try:
            local("~/scripts/{}.py {}".format('common_download_git_certfile', params))
            local("~/scripts/{}.py {}".format('manage_git_creds', params))
        except:
            append_result("Failed setup git credentials")
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed to setup git credentials.", str(err))
        GCPActions().remove_instance(notebook_config['instance_name'], notebook_config['zone'])
        sys.exit(1)

    # generating output information
    ip_address = GCPMeta().get_private_ip_address(notebook_config['instance_name'])
    zeppelin_ip_url = "http://" + ip_address + ":8080/"
    ungit_ip_url = "http://" + ip_address + ":8085/{}-ungit/".format(notebook_config['exploratory_name'])
    print('[SUMMARY]')
    logging.info('[SUMMARY]')
    print("Instance name: {}".format(notebook_config['instance_name']))
    print("Private IP: {}".format(ip_address))
    print("Instance type: {}".format(notebook_config['instance_type']))
    print("Key name: {}".format(notebook_config['key_name']))
    print("User key name: {}".format(os.environ['edge_user_name']))
    print("Zeppelin URL: {}".format(zeppelin_ip_url))
    print("Ungit URL: {}".format(ungit_ip_url))
    print('SSH access (from Edge node, via IP address): ssh -i {0}.pem {1}@{2}'.format(notebook_config['key_name'],
                                                                                       notebook_config['dlab_ssh_user'],
                                                                                       ip_address))

    with open("/root/result.json", 'w') as result:
        res = {"hostname": ip_address,
               "ip": ip_address,
               "instance_id": notebook_config['instance_name'],
               "master_keyname": os.environ['conf_key_name'],
               "notebook_name": notebook_config['instance_name'],
               "Action": "Create new notebook server",
               "exploratory_url": [
                   {"description": "Apache Zeppelin",
                    "url": zeppelin_ip_url},
                   {"description": "Ungit",
                    "url": ungit_ip_url}]}
        result.write(json.dumps(res))