# Copyright (c) 2013 Rackspace, Inc.
#
# Licensed 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
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import binascii
import json
import os
import string

from marconi.tests.system.common import config
from marconi.tests.system.common import http


CFG = config.Config()


def get_keystone_token():
    """Gets Keystone Auth token."""
    req_json = {
        'auth': {
        'passwordCredentials': {
        'username': CFG.username,
        'password': CFG.password
        }
        },
    }

    header = '{"Host":  "identity.api.rackspacecloud.com",'
    header += '"Content-Type": "application/json","Accept":"application/json"}'
    url = CFG.auth_url

    response = http.post(url=url, header=header, body=req_json)
    response_body = json.loads(response.text)

    auth_token = response_body['access']['token']['id']

    return auth_token


def get_auth_token():
    """Returns a valid auth token if auth is turned on."""
    if CFG.auth_enabled:
        auth_token = get_keystone_token()
    else:
        auth_token = 'notrealtoken'

    return auth_token


def create_marconi_headers():
    """Returns headers to be used for all Marconi requests."""
    auth_token = get_auth_token()

    headers = '{"Host": "$host","User-Agent": "$user_agent","Date":"DATE",'
    headers += '"Accept":  "application/json","Accept-Encoding":  "gzip",'
    headers += '"X-Project-ID": "$project_id",'
    headers += '"X-Auth-Token":  "$token","Client-ID":  "$uuid"}'
    headers = string.Template(headers)

    return headers.substitute(host=CFG.host, user_agent=CFG.user_agent,
                              project_id=CFG.project_id,
                              token=auth_token, uuid=CFG.uuid)


def invalid_auth_token_header():
    """Returns a header with invalid auth token."""
    headers = '{"Host":"$host","User-Agent":"$user_agent","Date":"DATE",'
    headers += '"Accept":  "application/json","Accept-Encoding":  "gzip",'
    headers += '"X-Project-ID": "$project_id",'
    headers += '"X-Auth-Token":  "InvalidToken"}'
    headers = string.Template(headers)

    return headers.substitute(host=CFG.host,
                              project_id=CFG.project_id,
                              user_agent=CFG.user_agent)


def missing_header_fields():
    """Returns a header with missing USER_AGENT & X-Project-ID."""
    auth_token = get_auth_token()

    headers = '{"Host":  "$host","Date":  "DATE",'
    headers += '"Accept":  "application/json","Accept-Encoding":  "gzip",'
    headers += '"X-Auth-Token":  "$token"}'
    headers = string.Template(headers)

    return headers.substitute(host=CFG.host, token=auth_token)


def plain_text_in_header():
    """Returns headers to be used for all Marconi requests."""
    auth_token = get_auth_token()

    headers = '{"Host":"$host","User-Agent":"$user_agent","Date":"DATE",'
    headers += '"Accept":  "text/plain","Accept-Encoding":  "gzip",'
    headers += '"X-Project-ID": "$project_id",'
    headers += '"X-Auth-Token":  "$token","Client-ID":  "$uuid"}'
    headers = string.Template(headers)

    return headers.substitute(host=CFG.host, user_agent=CFG.user_agent,
                              project_id=CFG.project_id,
                              token=auth_token, uuid=CFG.uuid)


def asterisk_in_header():
    """Returns headers to be used for all Marconi requests."""
    auth_token = get_auth_token()

    headers = '{"Host":"$host","User-Agent":"$user_agent","Date":"DATE",'
    headers += '"Accept":  "*/*","Accept-Encoding":  "gzip",'
    headers += '"X-Project-ID": "$project_id",'
    headers += '"X-Auth-Token":  "$token"}'
    headers = string.Template(headers)

    return headers.substitute(host=CFG.host, user_agent=CFG.user_agent,
                              project_id=CFG.project_id, token=auth_token)


def get_headers(input_header):
    """Creates http request headers.

    1. If header value is specified in the test_data.csv, that will be used.
    2. Headers can also be substituted in the Robot test case definition
    file (*_tests.txt)
    3. If 1. & 2. is not true -->
      Replaces the header data with generic Marconi headers.
    """
    if input_header:
        header = input_header
    else:
        header = create_marconi_headers()

    return header


def get_custom_body(kwargs):
    """Returns a custom request body."""
    req_body = {'data': '[DATA]'}
    if 'metadatasize' in kwargs.keys():
        random_data = binascii.b2a_hex(os.urandom(kwargs['metadatasize']))
        req_body['data'] = random_data

    return json.dumps(req_body)


def create_url_from_appender(appender):
    """Returns complete url using the appender (with a  a preceding '/')."""
    next_url = str(CFG.base_server + appender)
    return(next_url)


def get_url_from_location(header):
    """returns : the complete url referring to the location."""
    location = header['location']
    url = create_url_from_appender(location)
    return url


def verify_delete(url, header):
    """Verifies the DELETE was successful, with a GET on the deleted item."""
    test_result_flag = False

    getmsg = http.get(url, header)
    if getmsg.status_code == 404:
        test_result_flag = True
    else:
        print('GET after DELETE failed')
        print('URL')
        print url
        print('headers')
        print header
        print('Response Body')
        print getmsg.text
        print 'GET Code {}'.format(getmsg.status_code)

    return test_result_flag