#pragma once
#include "WorldManager.h"

void InitWorld(VWorld * world) {
	world->cameraPos.x = 0.0;
	world->cameraPos.y = 0.0;
	world->cameraPos.z = 0.0;
	world->view.x = 0.0;
	world->view.y = 0.0;
	world->view.z = -1.0;
	world->up.x = 0.0;
	world->up.y = 1.0;
	world->up.z = 0.0;
}

void CleanUpWorld(VWorld * world) {
	#pragma unused(world) /* Nothing necessary to do here yet */
}

void OffsetCamera(VWorld * world, Vector * offset, float interval) {
	world->cameraPos.x += offset->x / interval;
	world->cameraPos.y += offset->y / interval;
	world->cameraPos.z += offset->z / interval;
	
	world->view.x += offset->x / interval;
	world->view.y += offset->y / interval;
	world->view.z += offset->z / interval;
}

void RotateCamera(VWorld * world, Vector * rotate, float interval)
{
	Vector Look;
	Vector NewRotate;
	
	NewRotate = *rotate;
	NewRotate.x /= interval;
	NewRotate.y /= interval;
	NewRotate.z /= interval;
	
	ForwardsVector(world, 1, &Look);
	NormalizeVector(&Look);
	
	RotateVector(&Look, &NewRotate);
	
	AddVector(&world->cameraPos, &Look, &world->view);
}

void ForwardsVector(VWorld * w, float Distance, Vector * Forwards)
{
	Forwards->x = (w->view.x - w->cameraPos.x) * Distance;
	Forwards->y = (w->view.y - w->cameraPos.y) * Distance;
	Forwards->z = (w->view.z - w->cameraPos.z) * Distance;
}

void ApplyCamera(VWorld * world)
{
	gluLookAt
		(world->cameraPos.x, world->cameraPos.y, world->cameraPos.z, 
		world->view.x, world->view.y, world->view.z, 
		world->up.x, world->up.y, world->up.z);
}