/**

GDevelop - Draggable Behavior Extension
Copyright (c) 2014-2016 Florian Rival (Florian.Rival@gmail.com)
This project is released under the MIT License.
*/

#include "DraggableRuntimeBehavior.h"
#include <SFML/Graphics.hpp>
#include <iostream>
#include <memory>
#include "GDCpp/Runtime/CommonTools.h"
#include "GDCpp/Runtime/Project/Layout.h"
#include "GDCpp/Runtime/RuntimeLayer.h"
#include "GDCpp/Runtime/RuntimeObject.h"
#include "GDCpp/Runtime/RuntimeScene.h"
#include "GDCpp/Runtime/Serialization/SerializerElement.h"

bool DraggableRuntimeBehavior::somethingDragged = false;
bool DraggableRuntimeBehavior::leftPressedLastFrame = false;

DraggableRuntimeBehavior::DraggableRuntimeBehavior(
    const gd::SerializerElement& behaviorContent)
    : RuntimeBehavior(behaviorContent), dragged(false) {}

void DraggableRuntimeBehavior::DoStepPreEvents(RuntimeScene& scene) {
  // Begin drag ?
  if (!dragged && scene.GetInputManager().IsMouseButtonPressed("Left") &&
      !leftPressedLastFrame && !somethingDragged) {
    RuntimeLayer& theLayer = scene.GetRuntimeLayer(object->GetLayer());
    for (std::size_t cameraIndex = 0; cameraIndex < theLayer.GetCameraCount();
         ++cameraIndex) {
      sf::Vector2f mousePos = scene.renderWindow->mapPixelToCoords(
          scene.GetInputManager().GetMousePosition(),
          theLayer.GetCamera(cameraIndex).GetSFMLView());

      if (object->GetDrawableX() <= mousePos.x &&
          object->GetDrawableX() + object->GetWidth() >= mousePos.x &&
          object->GetDrawableY() <= mousePos.y &&
          object->GetDrawableY() + object->GetHeight() >= mousePos.y) {
        dragged = true;
        somethingDragged = true;
        xOffset = mousePos.x - object->GetX();
        yOffset = mousePos.y - object->GetY();
        dragCameraIndex = cameraIndex;
        break;
      }
    }
  }
  // End dragging ?
  else if (!scene.GetInputManager().IsMouseButtonPressed("Left")) {
    dragged = false;
    somethingDragged = false;
  }

  // Being dragging ?
  if (dragged) {
    RuntimeLayer& theLayer = scene.GetRuntimeLayer(object->GetLayer());
    sf::Vector2f mousePos = scene.renderWindow->mapPixelToCoords(
        scene.GetInputManager().GetMousePosition(),
        theLayer.GetCamera(dragCameraIndex).GetSFMLView());

    object->SetX(mousePos.x - xOffset);
    object->SetY(mousePos.y - yOffset);
  }
}

void DraggableRuntimeBehavior::DoStepPostEvents(RuntimeScene& scene) {
  leftPressedLastFrame = scene.GetInputManager().IsMouseButtonPressed("Left");
}

void DraggableRuntimeBehavior::OnDeActivate() {
  if (dragged) somethingDragged = false;
  dragged = false;
}