/*
 * Copyright 2015 Google 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.
 */

#ifndef COBALT_WEBDRIVER_UTIL_COMMAND_RESULT_H_
#define COBALT_WEBDRIVER_UTIL_COMMAND_RESULT_H_

#include <string>

#include "base/optional.h"
#include "cobalt/webdriver/protocol/response.h"

namespace cobalt {
namespace webdriver {
namespace util {

// Helper class for returning a status code and result pair.
template <typename T>
class CommandResult {
 public:
  CommandResult() : status_code_(protocol::Response::kUnknownError) {}
  explicit CommandResult(protocol::Response::StatusCode status)
      : status_code_(status) {}
  CommandResult(protocol::Response::StatusCode status,
                const std::string& message)
      : status_code_(status), error_message_(message) {}
  explicit CommandResult(const T& result)
      : status_code_(protocol::Response::kSuccess), result_(result) {}

  bool is_success() const {
    return status_code_ == protocol::Response::kSuccess;
  }
  protocol::Response::StatusCode status_code() const { return status_code_; }
  const T& result() const { return result_.value(); }
  std::string error_message() const { return error_message_.value_or(""); }

 private:
  protocol::Response::StatusCode status_code_;
  base::optional<T> result_;
  base::optional<std::string> error_message_;
};

template <>
class CommandResult<void> {
 public:
  CommandResult() : status_code_(protocol::Response::kUnknownError) {}
  explicit CommandResult(protocol::Response::StatusCode status)
      : status_code_(status) {}
  CommandResult(protocol::Response::StatusCode status,
                const std::string& message)
      : status_code_(status), error_message_(message) {}

  bool is_success() const {
    return status_code_ == protocol::Response::kSuccess;
  }
  protocol::Response::StatusCode status_code() const { return status_code_; }
  std::string error_message() const { return error_message_.value_or(""); }

 private:
  protocol::Response::StatusCode status_code_;
  base::optional<std::string> error_message_;
};

}  // namespace util
}  // namespace webdriver
}  // namespace cobalt

#endif  // COBALT_WEBDRIVER_UTIL_COMMAND_RESULT_H_