/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2018 Osimis S.A., Belgium
 *
 * This program is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include <boost/shared_ptr.hpp>
#include <json/json.h>

#include "IWebService.h"
#include "../Messages/IObservable.h"
#include "../Messages/Promise.h"

namespace OrthancStone
{
  class OrthancApiClient:
      public IObservable
  {
  public:

    struct JsonResponseReadyMessage : public BaseMessage<MessageType_OrthancApi_GenericGetJson_Ready>
    {
      Json::Value   Response;
      std::string   Uri;
      Orthanc::IDynamicObject*  Payload;

      JsonResponseReadyMessage(const std::string& uri,
                               const Json::Value& response,
                               Orthanc::IDynamicObject*  payload = NULL)
        : BaseMessage(),
          Response(response),
          Uri(uri),
          Payload(payload)
      {
      }
    };

    struct HttpErrorMessage : public BaseMessage<MessageType_OrthancApi_GenericHttpError_Ready>
    {
      std::string   Uri;
      Orthanc::IDynamicObject*  Payload;

      HttpErrorMessage(const std::string& uri,
                       Orthanc::IDynamicObject*  payload = NULL)
        : BaseMessage(),
          Uri(uri),
          Payload(payload)
      {
      }
    };

    struct BinaryResponseReadyMessage : public BaseMessage<MessageType_OrthancApi_GenericGetBinary_Ready>
    {
      const void* Answer;
      size_t AnswerSize;
      std::string   Uri;
      Orthanc::IDynamicObject*  Payload;

      BinaryResponseReadyMessage(const std::string& uri,
                                 const void* answer,
                                 size_t answerSize,
                                 Orthanc::IDynamicObject*  payload = NULL)
        : BaseMessage(),
          Answer(answer),
          AnswerSize(answerSize),
          Uri(uri),
          Payload(payload)
      {
      }
    };



  public:

    enum Mode
    {
      Mode_GetJson
    };

  protected:
    IWebService&                      orthanc_;

  public:
    OrthancApiClient(MessageBroker& broker,
                     IWebService& orthanc);
    virtual ~OrthancApiClient() {}

    // schedule a GET request expecting a JSON response.
    void GetJsonAsync(const std::string& uri,
                      MessageHandler<JsonResponseReadyMessage>* successCallback,
                      MessageHandler<HttpErrorMessage>* failureCallback = NULL,
                      Orthanc::IDynamicObject* payload = NULL);

    // schedule a GET request expecting a binary response.
    void GetBinaryAsync(const std::string& uri,
                        const std::string& contentType,
                        MessageHandler<BinaryResponseReadyMessage>* successCallback,
                        MessageHandler<HttpErrorMessage>* failureCallback = NULL,
                        Orthanc::IDynamicObject* payload = NULL)
    {
      IWebService::Headers headers;
      headers["Accept"] = contentType;
      GetBinaryAsync(uri, headers, successCallback, failureCallback, payload);
    }

    // schedule a GET request expecting a binary response.
    void GetBinaryAsync(const std::string& uri,
                        const IWebService::Headers& headers,
                        MessageHandler<BinaryResponseReadyMessage>* successCallback,
                        MessageHandler<HttpErrorMessage>* failureCallback = NULL,
                        Orthanc::IDynamicObject* payload = NULL);

    // schedule a POST request expecting a JSON response.
    void PostBinaryAsyncExpectJson(const std::string& uri,
                                   const std::string& body,
                                   MessageHandler<JsonResponseReadyMessage>* successCallback,
                                   MessageHandler<HttpErrorMessage>* failureCallback = NULL,
                                   Orthanc::IDynamicObject* payload = NULL);

    // schedule a POST request expecting a JSON response.
    void PostJsonAsyncExpectJson(const std::string& uri,
                                 const Json::Value& data,
                                 MessageHandler<JsonResponseReadyMessage>* successCallback,
                                 MessageHandler<HttpErrorMessage>* failureCallback = NULL,
                                 Orthanc::IDynamicObject* payload = NULL);

  };
}