# Copyright (c) 2014 ITOCHU Techno-Solutions Corporation.
#
#    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 copy
import json
import logging
import requests
from rackclient import exceptions
from rackclient.openstack.common import importutils


class HTTPClient(object):

    def __init__(self, rack_url=None, http_log_debug=False):
        self.rack_url = rack_url.rstrip('/')
        self.http_log_debug = http_log_debug
        self._logger = logging.getLogger(__name__)

        if self.http_log_debug and not self._logger.handlers:
            ch = logging.StreamHandler()
            self._logger.addHandler(ch)
            self._logger.propagate = False

    def http_log_req(self, method, url, kwargs):
        if not self.http_log_debug:
            return

        string_parts = ['curl -i']
        string_parts.append(" '%s'" % url)
        string_parts.append(' -X %s' % method)

        headers = copy.deepcopy(kwargs['headers'])
        keys = sorted(headers.keys())
        for name in keys:
            value = headers[name]
            header = ' -H "%s: %s"' % (name, value)
            string_parts.append(header)

        if 'data' in kwargs:
            data = json.loads(kwargs['data'])
            string_parts.append(" -d '%s'" % json.dumps(data))
        self._logger.debug("REQ: %s" % "".join(string_parts))

    def http_log_resp(self, resp):
        if not self.http_log_debug:
            return

        if resp.text and resp.status_code != 400:
            try:
                body = json.loads(resp.text)
            except ValueError:
                body = None
        else:
            body = None

        self._logger.debug("RESP: [%(status)s] %(headers)s\nRESP BODY: "
                           "%(text)s\n", {'status': resp.status_code,
                                          'headers': resp.headers,
                                          'text': json.dumps(body)})

    def request(self, url, method, **kwargs):
        kwargs.setdefault('headers', {})
        kwargs['headers']['User-Agent'] = 'python-rackclient'
        kwargs['headers']['Accept'] = 'application/json'
        if 'body' in kwargs:
            kwargs['headers']['Content-Type'] = 'application/json'
            kwargs['data'] = json.dumps(kwargs['body'])
            del kwargs['body']

        url = self.rack_url + url

        self.http_log_req(method, url, kwargs)

        request_func = requests.request
        resp = request_func(
            method,
            url,
            **kwargs)

        self.http_log_resp(resp)

        if resp.text:
            try:
                body = json.loads(resp.text)
            except ValueError:
                body = None
        else:
            body = None

        if resp.status_code >= 400:
            raise exceptions.from_response(resp, body, url, method)

        return resp, body

    def get(self, url, **kwargs):
        return self.request(url, 'GET', **kwargs)

    def post(self, url, **kwargs):
        return self.request(url, 'POST', **kwargs)

    def put(self, url, **kwargs):
        return self.request(url, 'PUT', **kwargs)

    def delete(self, url, **kwargs):
        return self.request(url, 'DELETE', **kwargs)


def get_client_class(version):
    version_map = {
        '1': 'rackclient.v1.client.Client',
    }
    try:
        client_path = version_map[str(version)]
    except (KeyError, ValueError):
        msg = ("Invalid client version '%(version)s'. must be one of: "
               "%(keys)s") % {'version': version,
                              'keys': ', '.join(version_map.keys())}
        raise exceptions.UnsupportedVersion(msg)

    return importutils.import_class(client_path)


def Client(version, *args, **kwargs):
    client_class = get_client_class(version)
    return client_class(*args, **kwargs)