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

void InitExplosion(VExplosion * e, VObject * o, float duration)
{
	int i;
	int iplusone;
	int NumVertices;
	
	switch(o->Model.PrimitiveType)
	{
		case GL_POINTS: NumVertices = 1; break;
		case GL_LINES: NumVertices = 2; break;
		case GL_TRIANGLES: NumVertices = 3; break;
		case GL_QUADS: NumVertices = 4; break;
	}
	
	duration *= 400;
	
	e->markedForRemoval = false;
	e->next = NULL;
	e->NumLines = o->Model.NumberOfVertices;
	e->NumQuads = 10;
	e->TimeLeft = duration;
	e->Duration = duration;
	e->lines = (VObject *) NewPtr(sizeof(VObject) * e->NumLines);
	e->quads = (VObject *) NewPtr(sizeof(VObject) * e->NumQuads);
	e->rotates = (Vector *) NewPtr(sizeof(Vector) * e->NumLines);
	
	for(i = 0; i < e->NumLines; i++)
	{
		/* Every NumVerices'th vertex, I have to create a line 
		connecting the first vertex to the last */
		iplusone = i + 1;
		if(iplusone % NumVertices == 0)
			iplusone = i - 3;
		InitObject(&e->lines[i]);
		
		e->lines[i].Model.NumberOfVertices = 2;
		AllocateVertices(&e->lines[i].Model, 2);
		
		e->lines[i].Position = o->Position;
		e->lines[i].Front = o->Front;
		e->lines[i].Right = o->Right;
		e->lines[i].Up = o->Up;
		e->lines[i].Model.PrimitiveType = GL_LINES;
		e->lines[i].Model.WireFrame = true;
		e->lines[i].Model.Vertices[0] = o->Model.Vertices[i];
		e->lines[i].Model.Vertices[1] = o->Model.Vertices[iplusone];
		memcpy(e->lines[i].Model.Color, o->Model.Color, sizeof(o->Model.Color));
		
		e->rotates[i].x = ((float)(Random() % 100) / 50000);
		e->rotates[i].y = ((float)(Random() % 100) / 50000);
		e->rotates[i].z = ((float)(Random() % 100) / 50000);
	}
	
	for(i = 0; i < e->NumQuads; i++)
	{
		InitObject(&e->quads[i]);
		BuildExplosionModel(&e->quads[i].Model);
		e->quads[i].Position = o->Position;
		
		switch(Random() % 3)
		{
			case 0:
				e->quads[i].Model.Color[0] = 1;
				e->quads[i].Model.Color[1] = 0.5;
				e->quads[i].Model.Color[2] = 0;
				break;
			case 1:
				e->quads[i].Model.Color[0] = 1;
				e->quads[i].Model.Color[1] = 0;
				e->quads[i].Model.Color[2] = 0;
				break;
			case 2:
				e->quads[i].Model.Color[0] = 1;
				e->quads[i].Model.Color[1] = 1;
				e->quads[i].Model.Color[2] = 0;
				break;
		}
	}
}

static void ProcessExplosionObject(VExplosion * e, VObject * o, float interval, int i)
{
	Quaternion QuatView;
	Vector NewRot;
	
	o->Model.Color[3] = (e->TimeLeft / e->Duration);
	
	NewRot = e->rotates[i];
	NormalizeVector(&NewRot);
	QuaternionRotateVector(VectorMagnitude(&e->rotates[i]), interval, &NewRot, 
		&o->Front, &QuatView);
	o->Front.x = QuatView.v.x;
	o->Front.y = QuatView.v.y;
	o->Front.z = QuatView.v.z;
	
	CrossProduct(&o->Front, &o->Right, &o->Up);
	CrossProduct(&o->Up, &o->Front, &o->Right);
	NormalizeVector(&o->Right);
	NormalizeVector(&o->Up);
	
	NewRot = e->rotates[i];
	NewRot.x *= EXPLOSIONSPEED;
	NewRot.y *= EXPLOSIONSPEED;
	NewRot.z *= EXPLOSIONSPEED;
	
	AddVector(&o->Position, &NewRot, &o->Position);
}

void RunExplosion(VExplosion * e, float interval)
{
	int i;
	e->TimeLeft -= (1.0 / interval);
	
	if(e->TimeLeft <= 0)
		e->markedForRemoval = true;
	
	for(i = 0; i < e->NumLines; i++)
	{
		ProcessExplosionObject(e, &e->lines[i], interval, i);
	}
	for(i = 0; i < e->NumQuads; i++)
	{
		ProcessExplosionObject(e, &e->quads[i], interval, i);
	}
}

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

void CleanUpExplosion(VExplosion * e)
{
	int i;
	
	for(i = 0; i < e->NumLines; i++)
	{
		DisposePtr((Ptr)e->lines[i].Model.Vertices);
		CleanUpObject(&e->lines[i]);
	}
	for(i = 0; i < e->NumQuads; i++)
	{
		CleanUpObject(&e->quads[i]);
	}
	DisposePtr((Ptr)e->lines);
	DisposePtr((Ptr)e->quads);
	DisposePtr((Ptr)e->rotates);
}