# -*- encoding: utf-8 -*-
# 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 pecan
from wsme import types as wtypes

from watcher.api.controllers import base


def build_url(resource, resource_args, bookmark=False, base_url=None):
    if base_url is None:
        base_url = pecan.request.application_url

    template = '%(url)s/%(res)s' if bookmark else '%(url)s/v1/%(res)s'
    # FIXME(lucasagomes): I'm getting a 404 when doing a GET on
    # a nested resource that the URL ends with a  '/'.
    # https://groups.google.com/forum/#!topic/pecan-dev/QfSeviLg5qs
    template += '%(args)s' if resource_args.startswith('?') else '/%(args)s'
    return template % {'url': base_url, 'res': resource, 'args': resource_args}


class Link(base.APIBase):
    """A link representation."""

    href = wtypes.text
    """The url of a link."""

    rel = wtypes.text
    """The name of a link."""

    type = wtypes.text
    """Indicates the type of document/link."""

    @staticmethod
    def make_link(rel_name, url, resource, resource_args,
                  bookmark=False, type=wtypes.Unset):
        href = build_url(resource, resource_args,
                         bookmark=bookmark, base_url=url)
        return Link(href=href, rel=rel_name, type=type)

    @classmethod
    def sample(cls):
        sample = cls(href="http://localhost:6385/chassis/"
                          "eaaca217-e7d8-47b4-bb41-3f99f20eed89",
                     rel="bookmark")
        return sample
