#!/usr/bin/env python
# encoding: utf-8
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#    http://www.apache.org/licenses/LICENSE-2.0
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"""This module provides functions to register AWSAccessKeyIds and AWSSecretKeys.
"""

import argparse
from xml.dom.minidom import parseString as xmlparse

import requests


def _generate_args(description):
    """
    Generates the base application with required parameters.

    @param description: Description of the command.
    @return: The args associated with the command.
    """
    parser = argparse.ArgumentParser(
        description=description
    )

    parser.add_argument(
        'ec2stack_server_address',
        help='The address of the ec2stack server http://localhost:5000'
    )

    parser.add_argument(
        'AWSAccessKeyId',
        help='Your Cloudstack API Key'
    )

    parser.add_argument(
        'AWSSecretKey',
        help='Your Cloudstack Secret Key'
    )

    args = parser.parse_args()

    return vars(args)


def register():
    """
    Entry point for registering an api key and secret key.

    """
    args = _generate_args(
        'Command line utility for registering a secret key with ec2stack'
    )
    args['Action'] = 'RegisterSecretKey'
    _execute_request(args)


def remove():
    """
    Entry point for removing an api key and secret key.

    """
    args = _generate_args(
        'Command line utility for removing a secret key from ec2stack'
    )
    args['Action'] = 'RemoveSecretKey'
    _execute_request(args)


def _execute_request(args):
    """
    Executes the register/remove request.

    @param args: Request payload.
    """
    host = args.pop('ec2stack_server_address')
    response = requests.post(host, args)
    response = xmlparse(response.text)
    message = response.getElementsByTagName('Message')[0].firstChild.nodeValue
    print message