// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.

#include <type_traits>

#include <stout/hashmap.hpp>

#include "resource_provider/local.hpp"

#include "resource_provider/storage/provider.hpp"

namespace http = process::http;

using std::string;

using process::Owned;

using process::http::authentication::Principal;

namespace mesos {
namespace internal {

struct ProviderAdaptor
{
  decltype(LocalResourceProvider::create)* const create;
  decltype(LocalResourceProvider::validate)* const validate;
};


// TODO(jieyu): Document the built-in local resource providers.
static const hashmap<string, ProviderAdaptor> adaptors = {
#ifdef __linux__
  {"org.apache.mesos.rp.local.storage",
   {&StorageLocalResourceProvider::create,
    &StorageLocalResourceProvider::validate}},
#endif
};


Try<Owned<LocalResourceProvider>> LocalResourceProvider::create(
    const http::URL& url,
    const string& workDir,
    const ResourceProviderInfo& info,
    const SlaveID& slaveId,
    const Option<string>& authToken,
    bool strict)
{
  if (!adaptors.contains(info.type())) {
    return Error("Unknown local resource provider type '" + info.type() + "'");
  }

  return adaptors.at(info.type()).create(
      url, workDir, info, slaveId, authToken, strict);
}


Option<Error> LocalResourceProvider::validate(const ResourceProviderInfo& info)
{
  if (!adaptors.contains(info.type())) {
    return Error("Unknown local resource provider type '" + info.type() + "'");
  }

  return adaptors.at(info.type()).validate(info);
}


Principal LocalResourceProvider::principal(const ResourceProviderInfo& info)
{
  // The 'cid_prefix' for the resource provider is of the following format:
  //     <rp_type>-<rp_name>--
  // where <rp_type> and <rp_name> are the type and name of the resource
  // provider, with dots replaced by dashes. We use a double-dash at the end to
  // explicitly mark the end of the prefix.
  const string cidPrefix = strings::join(
      "-",
      strings::replace(info.type(), ".", "-"),
      info.name(),
      "-");

  return Principal(
      Option<string>::none(),
      {{"cid_prefix", cidPrefix}});
}

} // namespace internal {
} // namespace mesos {