#include "Explosion.h"
#include <stdlib.h>

void InitExplosion(VExplosion * e, int NumLines, float duration, Vector * Position)
{
	int i;
	e->markedForRemoval = false;
	e->next = NULL;
	e->NumLines = NumLines;
	e->TimeLeft = duration;
	e->Duration = duration;
	e->lines = (VObject *) NewPtrClear(sizeof(VObject) * e->NumLines);
	e->rotates = (Vector *) NewPtrClear(sizeof(Vector) * e->NumLines);
	e->moves = (Vector *) NewPtrClear(sizeof(Vector) * e->NumLines);
	
	for(i = 0; i < e->NumLines; i++)
	{
		InitObject(&e->lines[i]);
		BuildExplosionModel(&e->lines[i].Model);
		e->lines[i].Position = *Position;
		e->rotates[i].x = ((float)(Random() % 200) - 100) / 1000;
		e->rotates[i].y = ((float)(Random() % 200) - 100) / 1000;
		e->rotates[i].z = ((float)(Random() % 200) - 100) / 1000;
		
		e->moves[i].x = ((float)(Random() % 200) - 100) / 10000;
		if (Random() % 2) e->moves[i].x *= -1;
		e->moves[i].y = ((float)(Random() % 200) - 100) / 10000;
		if (Random() % 2) e->moves[i].y *= -1;
		e->moves[i].z = ((float)(Random() % 200) - 100) / 10000;
		if (Random() % 2) e->moves[i].z *= -1;
		
		e->lines[i].Model.Color[0] = 100 / (float)((Random() % 100) + 100);
		e->lines[i].Model.Color[1] = 100 / (float)((Random() % 100) + 100);
		e->lines[i].Model.Color[2] = 100 / (float)((Random() % 100) + 100);
	}
}

void CleanUpExplosion(VExplosion * e) {
  while (e->NumLines > 0) {
    e->NumLines--;
    CleanUpObject(&e->lines[e->NumLines]);
  }
  DisposePtr((Ptr) e->lines);
  e->lines = NULL;
  DisposePtr((Ptr) e->moves);
  e->moves = NULL;
  DisposePtr((Ptr) e->rotates);
  e->rotates = NULL;
}

void RunExplosion(VExplosion * e, float interval)
{
	int i;
	e->TimeLeft -= interval;
	
	if(e->TimeLeft <= 0)
		e->markedForRemoval = true;
	
	for(i = 0; i < e->NumLines; i++)
	{
		e->lines[i].Model.Color[3] -= 1 / (e->Duration / interval);
		
		AddVector(&e->lines[i].Position, &e->moves[i], &e->lines[i].Position);
		AddVector(&e->lines[i].Front, &e->rotates[i], &e->lines[i].Front);
		NormalizeVector(&e->lines[i].Front);
		
		CrossProduct(&e->lines[i].Front, &e->lines[i].Right, &e->lines[i].Up);
		CrossProduct(&e->lines[i].Up, &e->lines[i].Front, &e->lines[i].Right);
		NormalizeVector(&e->lines[i].Right);
		NormalizeVector(&e->lines[i].Up);
	}
}

void DrawExplosion(VExplosion * e)
{
	int i;
	for(i = 0; i < e->NumLines; i++)
	{
		DrawObject(&e->lines[i]);
	}
}