# Copyright 2013 Red Hat, Inc.
# All Rights Reserved.
#
# 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 json
import re
import urllib3

from six.moves import urllib

from config_tempest.constants import LOG
MULTIPLE_SLASH = re.compile(r'/+')


class ServiceError(Exception):
    pass


class Service(object):
    def __init__(self, name, service_url, token, disable_ssl_validation,
                 client=None):
        self.name = name
        self.service_url = service_url
        self.headers = {'Accept': 'application/json', 'X-Auth-Token': token}
        self.disable_ssl_validation = disable_ssl_validation
        self.client = client

        self.extensions = []
        self.versions = []

    def do_get(self, url, top_level=False, top_level_path=""):
        parts = list(urllib.parse.urlparse(url))
        # 2 is the path offset
        if top_level:
            parts[2] = '/' + top_level_path

        parts[2] = MULTIPLE_SLASH.sub('/', parts[2])
        url = urllib.parse.urlunparse(parts)

        try:
            if self.disable_ssl_validation:
                urllib3.disable_warnings()
                http = urllib3.PoolManager(cert_reqs='CERT_NONE')
            else:
                http = urllib3.PoolManager()
            r = http.request('GET', url, headers=self.headers)
        except Exception as e:
            LOG.error("Request on service '%s' with url '%s' failed",
                      (self.name, url))
            raise e
        if r.status >= 400:
            raise ServiceError("Request on service '%s' with url '%s' failed"
                               " with code %d" % (self.name, url, r.status))
        return r.data

    def set_extensions(self):
        self.extensions = []

    def set_versions(self):
        self.versions = []

    def get_extensions(self):
        return self.extensions

    def get_versions(self):
        return self.versions

    def set_default_tempest_options(self, conf):
        pass


class VersionedService(Service):
    def set_versions(self, top_level=True):
        body = self.do_get(self.service_url, top_level=top_level)
        body = json.loads(body)
        self.versions = self.deserialize_versions(body)

    def deserialize_versions(self, body):
        versions = []
        for version in body['versions']:
            if version['status'] != "DEPRECATED":
                versions.append(version)
        return map(lambda x: x['id'], versions)

    def no_port_cut_url(self):
        # if there is no port defined, cut the url from version to the end
        u = urllib3.util.parse_url(self.service_url)
        url = self.service_url
        if u.port is None:
            found = re.findall(r'v\d', url)
            if len(found) > 0:
                index = url.index(found[0])
                url = self.service_url[:index]
        return (url, u.port is not None)