/* W.P. van Paassen */

#include "Board.h"
#include "GameApp.h"
#include "Graphics.h"
#include "SexyVector.h"

// See the Draw method for more information on using the Color class.
#include "Color.h"

// We're going to add our own button widget, which requires knowing about the
// WidgetManager.
#include "WidgetManager.h"

// The SexyAppFramework resides in the "Sexy" namespace. As a convenience,
// you'll see in all the .cpp files "using namespace Sexy" to avoid
// having to prefix everything with Sexy::
using namespace Sexy;

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
Board::Board(GameApp* theApp)
{
  mApp = theApp;

  physics = new Physics();
  physics->SetPhysicsListener(this);
  physics->Init();

  InitDemo();
}

void Board::InitDemo() {

  physics->SetSteps(3);
  physics->ResizeStaticHash(50.0f,999);
  physics->ResizeActiveHash(50.0f,999);
  physics->SetGravity(SexyVector2(0,300));

  PhysicsObject* obj = physics->CreateStaticObject();
  obj->AddSegmentShape(SexyVector2(0,475), SexyVector2(625, 475), 0.0f, 1.0f, 1.0f);

  obj = physics->CreateStaticObject();
  obj->AddSegmentShape(SexyVector2(635,0), SexyVector2(635, 475), 0.0f,1.0f,1.0f);

  int num = 4;
  SexyVector2 verts[] = {
    SexyVector2(-7,-15),
    SexyVector2(-7, 15),
    SexyVector2( 7, 15),
    SexyVector2( 7,-15),
  };

  for(int i=0; i<47; i++){
    int j = i + 1;

    SexyVector2  a(i*10, i*10);
    SexyVector2 b(j*10, i*10);
    SexyVector2  c(j*10, j*10);
                
    PhysicsObject* obj = physics->CreateStaticObject();
    obj->AddSegmentShape(a, b, 0.0f,1.0f,1.0f);

    obj = physics->CreateStaticObject();
    obj->AddSegmentShape(b, c, 0.0f,1.0f,1.0f);
  }

  float moment = physics->ComputeMomentForPoly(1.0, num, verts, SexyVector2(0,-15));
  moment += physics->ComputeMomentForCircle(1.0, 0.0, 25.0, SexyVector2(0,15));

  obj = physics->CreateObject(1.0f, moment);
  obj->AddPolyShape(num, verts, SexyVector2(0.0f,-15.0f),0.0f,1.5f);
  obj->SetPosition(SexyVector2(40, 0));
  obj->SetAngularVelocity(-1.0f);          

  obj->AddCircleShape(25.0, SexyVector2(0,15),0.9f,1.5f);
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
Board::~Board()
{
  delete physics;
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
void Board::Update()
{
  // Let the parent class update as well. This will increment
  // the variable mUpdateCnt which is an integer that indicates 
  // how many times the Update() method has been called. Since our
  // Board class is updated 100 times per second, this variable will
  // increment 100 times per second. As you will see in later demos,
  // we will use this variable for animation since its value represents
  // hundredths of a second, which is for almost all games a good
  // enough timer value and doesn't rely on the system clock function
  // call.
  Widget::Update();

  physics->Update();
	
  // For this and most of the other demos, you will see the function
  // below called every Update() call. MarkDirty() tells the widget
  // manager that something has changed graphically in the widget and
  // that it needs to be repainted. All widgets follow this convention.
  //		In general, if you don't need
  // to update your drawing every time you call the Update method
  // (the most common case is when the game is paused) you should
  // NOT mark dirty. Why? If you aren't marking dirty every frame,
  // then you aren't drawing every frame and thus you use less CPU
  // time. Because people like to multitask, or they may be on a laptop
  // with limited battery life, using less CPU time lets people do
  // other things besides play your game. Of course, everyone
  // will want to play your game at all times, but it's good to be
  // nice to those rare people that might want to read email or
  // do other things at the same time. 
  //		In this particular demo, we
  // won't be nice, as the purpose is to bring you up to speed as
  // quickly as possible, and so we'll dispense with optimizations
  // for now, so you can concentrate on other core issues first.
  //		In general, this is the last method called in the Update
  // function, but that is not necessary. In fact, the MarkDirty
  // function can be called anywhere, in any method (although
  // calling it in the Draw method doesn't make sense since it is
  // already drawing) and even multiple times. Calling it multiple
  // times does not do anything: only the first call makes a difference.
  MarkDirty();
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
void Board::Draw(Graphics* g)
{
  // The Graphics object, "g", is 
  // automatically created and passed to this method by the 
  // WidgetManager and can be thought of as the main screen 
  // bitmap/canvas upon which all drawing will be done. This object
  // is double buffered automatically so you don't need to worry
  // about those details. All you need to do is instruct the object
  // that you would like to draw something to it, and when the
  // WidgetManager gets done letting all widgets draw to the
  // Graphics object, it will then blit everything to the screen
  // at once. 

  // First, let's start by clearing the screen to black. 
  // As you'll recall from Demo1, we set the color with SetColor
  // and pass in a Color object that contains either 3 or 4 parameters,
  // that represent the r,g,b,a values (alpha is 255 if only 3 specified).

  g->SetColor(Color(255, 255, 255));
  g->FillRect(0, 0, mWidth, mHeight);

  // Now let's try drawing a stretched image. We'll draw the original image
  // stretched to twice its size. Drawing a stretched image is exactly like
  // drawing a normal image, except that you have two extra parameters:
  // the stretched width and height. You can use this to draw a shrunk version
  // of the image as well (which we'll do second)	

  physics->Draw(g);
}

void Board::DrawPhysicsObject(PhysicsObject* object, Graphics* g) {
  
  g->SetColor(Color(128,128,128)); 
  SexyVector2 pos = object->GetPosition();

  int shape_index = object->GetCollidingShapeIndex();

    if (object->GetShapeType(shape_index) == object->CIRCLE_SHAPE) {

    float radius =  object->GetCircleShapeRadius(shape_index);
    SexyVector2 center = object->GetCircleShapeCenter(shape_index);
    float angle = object->GetAngle();

    const int segs = 15;
    const float coef = 2.0f*M_PI/(float)segs;        

    for(int n = 0; n < segs - 1; n++){
      float rads_begin = n*coef;
      float rads_end = (n+1)*coef;

      g->DrawLine((int)(radius*cosf(rads_begin + angle) + center.x), (int)(radius*sinf(rads_begin + angle) + center.y),
                  (int)(radius*cosf(rads_end + angle) + center.x), (int)(radius*sinf(rads_end + angle) + center.y));
    }

    float rads_begin = (segs-1)*coef;
    g->DrawLine((int)(radius*cosf(rads_begin + angle) + center.x), (int)(radius*sinf(rads_begin + angle) + center.y),
                (int)(radius*cosf(angle) + center.x), (int)(radius*sinf(angle) + center.y));
    g->DrawLine((int)(radius*cosf(angle) + center.x), (int)(radius*sinf(angle) + center.y),
                (int)pos.x, (int)pos.y);

  }
  else  if (object->GetShapeType(shape_index) == object->SEGMENT_SHAPE) {

    SexyVector2 startpos = object->GetSegmentShapeBegin(shape_index); 
    SexyVector2 endpos = object->GetSegmentShapeEnd(shape_index);
    g->DrawLine((int)startpos.x, (int)startpos.y, (int)endpos.x,(int)endpos.y);

  }
  else if (object->GetShapeType(shape_index) == object->POLY_SHAPE) {

    int num = object->GetNumberVertices(shape_index);

    for (int i = 0; i < num - 1; ++i) {
      SexyVector2 startpos = object->GetVertex(i,shape_index); 
      SexyVector2 endpos = object->GetVertex(i + 1,shape_index);
      g->DrawLine((int)startpos.x, (int)startpos.y, (int)endpos.x,(int)endpos.y);
    }

    SexyVector2 startpos = object->GetVertex(num - 1,shape_index);
    SexyVector2 endpos = object->GetVertex(0,shape_index);
    g->DrawLine((int)startpos.x, (int)startpos.y, (int)endpos.x,(int)endpos.y);
  }

  g->SetColor(Color(0,0,255));
  g->DrawLine((int)pos.x, (int)pos.y, (int)pos.x + 1,(int)pos.y);
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
void Board::AddedToManager(WidgetManager* theWidgetManager)
{
	// At this point, the Board class has already been added to the
	// widget manager. We should call our parent class' method
	// so that it can be sure to perform any needed tasks, first.
	Widget::AddedToManager(theWidgetManager);
}

//////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////
void Board::RemovedFromManager(WidgetManager* theWidgetManager)
{
	// This is called after we've been removed from the widget manager.
	// Again, we should let our base class do anything it needs to, first.
	Widget::RemovedFromManager(theWidgetManager);
}

void Board::KeyDown(KeyCode theKey) {
  if (theKey == KEYCODE_SPACE) {
    physics->Clear();
    physics->Init();
    InitDemo();
  }
}