/*

 Copyright (c) 2018, Ford Motor Company
 All rights reserved.

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 modification, are permitted provided that the following conditions are met:

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 list of conditions and the following disclaimer.

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 this list of conditions and the following
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 may be used to endorse or promote products derived from this software
 without specific prior written permission.

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 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

#include "vehicle_info_plugin/commands/mobile/unsubscribe_vehicle_data_request.h"
#include "application_manager/commands/command_impl.h"

#include "application_manager/application_impl.h"
#include "application_manager/message_helper.h"
#include "interfaces/MOBILE_API.h"
#include "interfaces/HMI_API.h"
#include "application_manager/smart_object_keys.h"
#include "utils/helpers.h"
#include "vehicle_info_plugin/vehicle_info_app_extension.h"

namespace vehicle_info_plugin {
using namespace application_manager;
namespace commands {

UnsubscribeVehicleDataRequest::UnsubscribeVehicleDataRequest(
    const application_manager::commands::MessageSharedPtr& message,
    ApplicationManager& application_manager,
    app_mngr::rpc_service::RPCService& rpc_service,
    app_mngr::HMICapabilities& hmi_capabilities,
    policy::PolicyHandlerInterface& policy_handler)
    : CommandRequestImpl(message,
                         application_manager,
                         rpc_service,
                         hmi_capabilities,
                         policy_handler) {}

UnsubscribeVehicleDataRequest::~UnsubscribeVehicleDataRequest() {}

void UnsubscribeVehicleDataRequest::Run() {
  LOG4CXX_AUTO_TRACE(logger_);

  ApplicationSharedPtr app = application_manager_.application(connection_key());

  if (!app) {
    LOG4CXX_ERROR(logger_, "NULL pointer");
    SendResponse(false, mobile_apis::Result::APPLICATION_NOT_REGISTERED);
    return;
  }

  int32_t items_to_unsubscribe = 0;
  int32_t unsubscribed_items = 0;

  const VehicleData& vehicle_data = MessageHelper::vehicle_data();
  VehicleData::const_iterator it = vehicle_data.begin();

  smart_objects::SmartObject msg_params =
      smart_objects::SmartObject(smart_objects::SmartType_Map);

  smart_objects::SmartObject response_params =
      smart_objects::SmartObject(smart_objects::SmartType_Map);

  for (; vehicle_data.end() != it; ++it) {
    const std::string& key_name = it->first;
    if ((*message_)[strings::msg_params].keyExists(key_name)) {
      bool is_key_enabled = (*message_)[strings::msg_params][key_name].asBool();
      if (is_key_enabled) {
        ++items_to_unsubscribe;

        mobile_apis::VehicleDataType::eType key_type = it->second;
        const auto is_subscribed =
            VehicleInfoAppExtension::ExtractVIExtension(*app)
                .isSubscribedToVehicleInfo(key_type);
        if (!is_subscribed) {
          ++unsubscribed_items;
          vi_already_unsubscribed_by_this_app_.insert(key_type);
          response_params[key_name][strings::data_type] = key_type;
          response_params[key_name][strings::result_code] =
              mobile_apis::VehicleDataResultCode::VDRC_DATA_NOT_SUBSCRIBED;
          continue;
        }

        if (!VehicleInfoAppExtension::ExtractVIExtension(*app)
                 .unsubscribeFromVehicleInfo(it->second)) {
          LOG4CXX_ERROR(logger_,
                        "Unable to unsubscribe from "
                        "VehicleDataType: "
                            << key_type);
          continue;
        }

        LOG4CXX_DEBUG(logger_,
                      "Unsubscribed app with connection key "
                          << connection_key()
                          << " from VehicleDataType: " << key_type);

        ++unsubscribed_items;

        if (IsSomeoneSubscribedFor(key_type)) {
          LOG4CXX_DEBUG(logger_,
                        "There are another apps still subscribed for "
                        "VehicleDataType: "
                            << key_type);

          vi_still_subscribed_by_another_apps_.insert(key_type);
          response_params[key_name][strings::data_type] = key_type;
          response_params[key_name][strings::result_code] =
              mobile_apis::VehicleDataResultCode::VDRC_SUCCESS;
          continue;
        }

        msg_params[key_name] = is_key_enabled;
      }
    }
  }

  bool is_everything_already_unsubscribed =
      static_cast<uint32_t>(items_to_unsubscribe) ==
      vi_still_subscribed_by_another_apps_.size() +
          vi_already_unsubscribed_by_this_app_.size();

  if (0 == items_to_unsubscribe) {
    if (HasDisallowedParams()) {
      SendResponse(false, mobile_apis::Result::DISALLOWED);
    } else {
      SendResponse(
          false, mobile_apis::Result::INVALID_DATA, "No data in the request.");
    }
    return;
  }

  if (0 == unsubscribed_items) {
    SendResponse(false,
                 mobile_apis::Result::IGNORED,
                 "Was not subscribed on any VehicleData.",
                 &response_params);
    return;
  }

  if (is_everything_already_unsubscribed) {
    if (!vi_already_unsubscribed_by_this_app_.empty()) {
      SendResponse(false,
                   mobile_apis::Result::IGNORED,
                   "Some provided VehicleData was not subscribed.",
                   &response_params);
    } else {
      SendResponse(true, mobile_apis::Result::SUCCESS, NULL, &response_params);
    }
    return;
  }

  StartAwaitForInterface(HmiInterfaces::HMI_INTERFACE_VehicleInfo);
  SendHMIRequest(hmi_apis::FunctionID::VehicleInfo_UnsubscribeVehicleData,
                 &msg_params,
                 true);
}

void UnsubscribeVehicleDataRequest::on_event(const event_engine::Event& event) {
  LOG4CXX_AUTO_TRACE(logger_);
  using namespace helpers;

  const smart_objects::SmartObject& message = event.smart_object();

  if (hmi_apis::FunctionID::VehicleInfo_UnsubscribeVehicleData != event.id()) {
    LOG4CXX_ERROR(logger_, "Received unknown event.");
    return;
  }
  EndAwaitForInterface(HmiInterfaces::HMI_INTERFACE_VehicleInfo);

  ApplicationSharedPtr app =
      application_manager_.application(CommandRequestImpl::connection_key());

  if (!app) {
    LOG4CXX_ERROR(logger_, "NULL pointer.");
    return;
  }

  hmi_apis::Common_Result::eType hmi_result =
      static_cast<hmi_apis::Common_Result::eType>(
          message[strings::params][hmi_response::code].asInt());
  std::string response_info;
  GetInfo(message, response_info);
  const bool result = PrepareResultForMobileResponse(
      hmi_result, HmiInterfaces::HMI_INTERFACE_VehicleInfo);

  mobile_apis::Result::eType result_code =
      MessageHelper::HMIToMobileResult(hmi_result);

  if (result) {
    if (vi_already_unsubscribed_by_this_app_.size()) {
      result_code = mobile_apis::Result::IGNORED;
      response_info = "Some provided VehicleData was not subscribed.";
    }
  }

  if (!vi_still_subscribed_by_another_apps_.empty() ||
      !vi_already_unsubscribed_by_this_app_.empty()) {
    AddAlreadyUnsubscribedVI(
        const_cast<smart_objects::SmartObject&>(message[strings::msg_params]));
  }

  if (result) {
    SetAllowedToTerminate(false);
  }
  SendResponse(result,
               result_code,
               response_info.empty() ? NULL : response_info.c_str(),
               &(message[strings::msg_params]));
  if (result) {
    application_manager_.TerminateRequest(
        connection_key(), correlation_id(), function_id());
  }
}

bool UnsubscribeVehicleDataRequest::Init() {
  hash_update_mode_ = HashUpdateMode::kDoHashUpdate;
  return true;
}

struct SubscribedToIVIPredicate {
  int32_t vehicle_info_;
  SubscribedToIVIPredicate(int32_t vehicle_info)
      : vehicle_info_(vehicle_info) {}
  bool operator()(const ApplicationSharedPtr app) const {
    DCHECK_OR_RETURN(app, false);
    auto& ext = VehicleInfoAppExtension::ExtractVIExtension(*app);
    return ext.isSubscribedToVehicleInfo(
        static_cast<mobile_apis::VehicleDataType::eType>(vehicle_info_));
  }
};

bool UnsubscribeVehicleDataRequest::IsSomeoneSubscribedFor(
    const uint32_t param_id) const {
  LOG4CXX_AUTO_TRACE(logger_);
  SubscribedToIVIPredicate finder(param_id);
  DataAccessor<ApplicationSet> accessor = application_manager_.applications();
  ApplicationSetConstIt it = std::find_if(
      accessor.GetData().begin(), accessor.GetData().end(), finder);
  return it != accessor.GetData().end();
}

void UnsubscribeVehicleDataRequest::AddAlreadyUnsubscribedVI(
    smart_objects::SmartObject& response) const {
  LOG4CXX_AUTO_TRACE(logger_);
  using namespace mobile_apis;
  VehicleInfoSubscriptions::const_iterator it_same_app =
      vi_already_unsubscribed_by_this_app_.begin();
  for (; vi_already_unsubscribed_by_this_app_.end() != it_same_app;
       ++it_same_app) {
    response[*it_same_app][strings::result_code] =
        VehicleDataResultCode::VDRC_DATA_NOT_SUBSCRIBED;
  }

  VehicleInfoSubscriptions::const_iterator it_another_app =
      vi_still_subscribed_by_another_apps_.begin();
  for (; vi_still_subscribed_by_another_apps_.end() != it_another_app;
       ++it_another_app) {
    response[*it_another_app][strings::result_code] =
        VehicleDataResultCode::VDRC_SUCCESS;
  }
}

}  // namespace commands
}  // namespace application_manager