/*
 * GDevelop Core
 * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
 * reserved. This project is released under the MIT License.
 */

#include "GDCore/Events/Event.h"

#include "GDCore/Events/Builtin/AsyncEvent.h"
#include "GDCore/Events/CodeGeneration/EventsCodeGenerator.h"
#include "GDCore/Events/EventsList.h"
#include "GDCore/Events/EventVisitor.h"
#include "GDCore/Extensions/Metadata/MetadataProvider.h"
#include "GDCore/Extensions/Platform.h"
#include "GDCore/Extensions/PlatformExtension.h"

namespace gd {

EventsList BaseEvent::badSubEvents;
std::vector<gd::String> BaseEvent::emptyDependencies;
gd::String BaseEvent::emptySourceFile;

BaseEvent::BaseEvent()
    : totalTimeDuringLastSession(0),
      percentDuringLastSession(0),
      disabled(false),
      folded(false) {}

bool BaseEvent::HasSubEvents() const { return !GetSubEvents().IsEmpty(); }

gd::String BaseEvent::GenerateEventCode(
    gd::EventsCodeGenerator& codeGenerator,
    gd::EventsCodeGenerationContext& context) {
  if (IsDisabled()) return "";

  try {
    if (type.empty()) return "";

    const gd::Platform& platform = codeGenerator.GetPlatform();

    // First try to guess the extension used
    gd::String eventNamespace = type.substr(0, type.find("::"));
    std::shared_ptr<gd::PlatformExtension> guessedExtension =
        platform.GetExtension(eventNamespace);
    if (guessedExtension) {
      std::map<gd::String, gd::EventMetadata>& allEvents =
          guessedExtension->GetAllEvents();
      if (allEvents.find(type) != allEvents.end())
        return allEvents[type].codeGeneration(*this, codeGenerator, context);
    }

    // Else make a search in all the extensions
    for (std::size_t i = 0; i < platform.GetAllPlatformExtensions().size();
         ++i) {
      std::shared_ptr<gd::PlatformExtension> extension =
          platform.GetAllPlatformExtensions()[i];
      if (!extension) continue;

      std::map<gd::String, gd::EventMetadata>& allEvents =
          extension->GetAllEvents();
      if (allEvents.find(type) != allEvents.end())
        return allEvents[type].codeGeneration(*this, codeGenerator, context);
    }
  } catch (...) {
    std::cout << "ERROR: Exception caught during code generation for event \""
              << type << "\"." << std::endl;
  }

  return "";
}

void BaseEvent::PreprocessAsyncActions(const gd::Platform& platform) {
  if (!CanHaveSubEvents()) return;
  for (const auto& actionsList : GetAllActionsVectors())
    for (std::size_t aId = 0; aId < actionsList->size(); ++aId) {
      const auto& action = actionsList->at(aId);
      const gd::InstructionMetadata& actionMetadata =
          gd::MetadataProvider::GetActionMetadata(platform, action.GetType());
      if (actionMetadata.IsAsync() &&
          (!actionMetadata.IsOptionallyAsync() || action.IsAwaited())) {
        gd::InstructionsList remainingActions;
        remainingActions.InsertInstructions(
            *actionsList, aId + 1, actionsList->size() - 1);
        gd::AsyncEvent asyncEvent(action, remainingActions, GetSubEvents());

        // Ensure that the local event no longer has any of the actions/subevent
        // after the async function
        actionsList->RemoveAfter(aId);
        GetSubEvents().Clear();

        GetSubEvents().InsertEvent(asyncEvent);

        // We just moved all the rest, there's nothing left to do in this event.
        return;
      }
    }
};

void BaseEvent::Preprocess(gd::EventsCodeGenerator& codeGenerator,
                           gd::EventsList& eventList,
                           std::size_t indexOfTheEventInThisList) {
  if (IsDisabled()) return;

  PreprocessAsyncActions(codeGenerator.GetPlatform());

  if (!MustBePreprocessed()) return;

  try {
    if (type.empty()) return;

    const gd::Platform& platform = codeGenerator.GetPlatform();

    // First try to guess the extension used
    gd::String eventNamespace = type.substr(0, type.find("::"));
    std::shared_ptr<gd::PlatformExtension> guessedExtension =
        platform.GetExtension(eventNamespace);
    if (guessedExtension) {
      std::map<gd::String, gd::EventMetadata>& allEvents =
          guessedExtension->GetAllEvents();
      if (allEvents.find(type) != allEvents.end())
        return allEvents[type].preprocessing(
            *this, codeGenerator, eventList, indexOfTheEventInThisList);
    }

    // Else make a search in all the extensions
    for (std::size_t i = 0; i < platform.GetAllPlatformExtensions().size();
         ++i) {
      std::shared_ptr<gd::PlatformExtension> extension =
          platform.GetAllPlatformExtensions()[i];
      if (!extension) continue;

      std::map<gd::String, gd::EventMetadata>& allEvents =
          extension->GetAllEvents();
      if (allEvents.find(type) != allEvents.end())
        return allEvents[type].preprocessing(
            *this, codeGenerator, eventList, indexOfTheEventInThisList);
    }
  } catch (...) {
    std::cout << "ERROR: Exception caught during preprocessing of event \""
              << type << "\"." << std::endl;
  }
}

bool BaseEvent::AcceptVisitor(gd::EventVisitor& eventVisitor) {
  return eventVisitor.VisitEvent(*this);
}

void BaseEvent::AcceptVisitor(gd::ReadOnlyEventVisitor& eventVisitor) const {
  eventVisitor.VisitEvent(*this);
}

BaseEventSPtr GD_CORE_API CloneRememberingOriginalEvent(BaseEventSPtr event) {
  gd::BaseEventSPtr copy(event->Clone());
  // Original event is either the original event of the copied event, or the
  // event copied.
  copy->originalEvent =
      event->originalEvent.expired() ? event : event->originalEvent;

  return copy;
}

}  // namespace gd