# Copyright 2017 The Armada Authors.
#
# 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 yaml

from oslo_config import cfg
from oslo_log import log as logging

from armada.exceptions import api_exceptions as err
from armada.handlers.armada import Override

LOG = logging.getLogger(__name__)
CONF = cfg.CONF

API_VERSION = 'v{}/{}'


class ArmadaClient(object):

    def __init__(self, session):
        self.session = session

    def _set_endpoint(self, version, action):
        return API_VERSION.format(version, action)

    def get_status(self, query, timeout=None):

        endpoint = self._set_endpoint('1.0', 'status')
        resp = self.session.get(endpoint, query=query, timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def get_releases(self, query, timeout=None):

        endpoint = self._set_endpoint('1.0', 'releases')
        resp = self.session.get(endpoint, query=query, timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def post_validate(self, manifest=None, timeout=None):

        endpoint = self._set_endpoint('1.0', 'validatedesign')
        # TODO(sh8121att) Look to update the UCP convention to
        # allow a list of hrefs
        req_body = {'href': manifest}

        resp = self.session.post(
            endpoint,
            data=req_body,
            headers={'content-type': 'application/json'},
            timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def post_apply(self,
                   manifest=None,
                   manifest_ref=None,
                   values=None,
                   set=None,
                   query=None,
                   timeout=None):
        """Call the Armada API to apply a Manifest.

        If ``manifest`` is not None, then the request body will be a fully
        rendered set of YAML documents including overrides and
        values-files application.

        If ``manifest`` is None and ``manifest_ref`` is not, then the request
        body will be a JSON structure providing a list of references
        to Armada manifest documents and a list of overrides. Local
        values files are not supported when using the API with references.

        :param manifest: string of YAML formatted Armada manifests
        :param manifest_ref: valid file paths or URIs referring to Armada
                             manifests
        :param values: list of local files containing values.yaml overrides
        :param set: list of single-value overrides
        :param query: explicit query string parameters
        :param timeout: a tuple of connect, read timeout (x, y)
        """
        endpoint = self._set_endpoint('1.0', 'apply')

        if manifest:
            if values or set:
                override = Override(
                    manifest, overrides=set, values=values).update_manifests()
                manifest = yaml.dump(override)
            resp = self.session.post(
                endpoint,
                body=manifest,
                query=query,
                headers={'content-type': 'application/x-yaml'},
                timeout=timeout)
        elif manifest_ref:
            req_body = {
                'hrefs': manifest_ref,
                'overrides': set or [],
            }
            resp = self.session.post(
                endpoint,
                data=req_body,
                query=query,
                headers={'content-type': 'application/json'},
                timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def post_rollback_release(self, release, query=None, timeout=None):

        endpoint = self._set_endpoint('1.0', 'rollback/{}'.format(release))
        resp = self.session.get(endpoint, query=query, timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def get_test_release(self, release=None, query=None, timeout=None):

        endpoint = self._set_endpoint('1.0', 'test/{}'.format(release))
        resp = self.session.get(endpoint, query=query, timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def post_test_manifest(self, manifest=None, query=None, timeout=None):

        endpoint = self._set_endpoint('1.0', 'tests')
        resp = self.session.post(
            endpoint, body=manifest, query=query, timeout=timeout)

        self._check_response(resp)

        return resp.json()

    def _check_response(self, resp):
        if resp.status_code == 401:
            raise err.ClientUnauthorizedError(
                "Unauthorized access to %s, include valid token.".format(
                    resp.url))
        elif resp.status_code == 403:
            raise err.ClientForbiddenError("Forbidden access to %s" % resp.url)
        elif not resp.ok:
            raise err.ClientError(
                "Error - received %d: %s" % (resp.status_code, resp.text))