/*
 * $Id: world.cpp,v 1.9 2002/07/18 23:05:31 msell Exp $
 *
 *
 * $Log: world.cpp,v $
 * Revision 1.9  2002/07/18 23:05:31  msell
 * Partikkelit ja kakkospelaajan liike
 *
 * Revision 1.8  2002/07/15 20:32:36  msell
 * Uudet valot ja ulkoasun parantelua
 *
 * Revision 1.7  2002/07/15 15:22:08  msell
 * Parantelua
 *
 * Revision 1.6  2002/07/14 21:40:43  msell
 * Conflictit pois, liikkumiset (hyppy, kävely, lyönti), uusi areena
 *
 * Revision 1.5  2002/07/10 17:13:44  msell
 * Törmäystarkastelun parantelua
 *
 * Revision 1.4  2002/07/08 18:28:47  msell
 * Törmäystä ja ukkoja
 *
 * Revision 1.3  2002/07/07 23:05:22  msell
 * Osien liimaaminen toisiinsa (kesken)
 *
 * Revision 1.2  2002/07/07 15:29:07  msell
 * Törmäyksien parantelua
 *
 * Revision 1.1  2002/07/04 21:05:41  msell
 * Se toimii!! =)
 * Törmäystarkistukset siis
 *
 *
 *
 * $Date: 2002/07/18 23:05:31 $
 *
 */

#include "world.h"

#include "object.h"
#include "collision.h"
#include "vector.h"

World::World(void){
	childlist = NULL;
	linklist = NULL;
	maxparticles = 500;
	particles = new Particle *[maxparticles];
	particlecount = 0;
}

void World::prepare(void){
	objectlist *node = childlist;
	childcount = 0;
	while (node != NULL){
		Object *child = node->object;
		child->prepare();
		node = node->next;
		childcount++;
	}

	childs = new Object *[childcount];
	node = childlist;
	int i = 0;
	while (node != NULL){
		Object *child = node->object;
		childs[i] = child;
		node = node->next;
		i++;
	}

	contacts = new Contact[MAXCONTACTS];//childcount*childcount];
}

#define GRAVITY 9.81
//#define GRAVITY 15

void World::move(void){
	int i, j;


	//Gravity
	float gravity[3];
	vectorSet(gravity, 0, 0, 0);
	for (i = 0; i < childcount; i++){
		Object *object = childs[i];
		if (object->gravity){
			gravity[1] = -object->getMass()*GRAVITY;
			object->addExternalForce(gravity);
		}
	}

	/*for (i = 0; i < particlecount; i++){
		Particle *object = particles[i];
		if (object->gravity){
			gravity[1] = -object->getMass()*GRAVITY;
			object->addExternalForce(gravity);
		}
	}*/


	//Collisions
	contactcount = 0;

	for (i = 0; i < childcount; i++){
		Object *object1 = childs[i];
		int group1 = object1->getCollisionGroup();
		for (j = i+1; j < childcount; j++){
			Object *object2 = childs[j];
			int group2 = object2->getCollisionGroup();

			if (isCollisionLink(group1, group2)){
				object2->geometry->checkCollision(object1);
			}
		}
	}

	/*for (i = 0; i < particlecount; i++){
		Particle *object1 = particles[i];
		int group1 = object1->getCollisionGroup();
		for (j = 0; j < childcount; j++){
			Object *object2 = childs[j];
			int group2 = object2->getCollisionGroup();

			if (isCollisionLink(group1, group2)){
				object2->geometry->checkCollision(object1);
			}
		}
	}*/

	//printf("Contacts: %i\n", contactcount);

	
	bool contactresponse;

	j = 0;
	do{
		contactresponse = false;

		//Links between objects
		objectlinklist *node = linklist;
		while (node != NULL){
			ObjectLink *link = node->link;
			if (handleLink(link)) contactresponse = true;
			node = node->next;
		}

		//Collision contact
		for (i = 0; i < contactcount; i++){
			Contact *contact = &contacts[i];
			if (handleCollision(contact)) contactresponse = true;
		}

		j++;
	} while (contactresponse && j < 10);
	
	/*j = 0;
	do{
		contactresponse = false;

		//Collision contact
		for (i = 0; i < contactcount; i++){
			Contact *contact = &contacts[i];
			if (handleCollision(contact)) contactresponse = true;
		}

		j++;
	} while (contactresponse && j < 10);*/

	/*j = 0;
	do{
		contactresponse = false;

		//Links between objects
		objectlinklist *node = linklist;
		while (node != NULL){
			ObjectLink *link = node->link;
			if (handleLink(link)) contactresponse = true;
			node = node->next;
		}

		j++;
	} while (contactresponse && j < 3);*/


	for (i = 0; i < childcount; i++){
		childs[i]->move();
	}
	for (i = 0; i < particlecount; i++){
		particles[i]->move();
	}
}

void World::draw(void){
	int i;
	for (i = 0; i < childcount; i++) childs[i]->draw();
	for (i = 0; i < particlecount; i++) particles[i]->draw();
}

void World::addChild(Object *child){
	objectlist *node = new objectlist;
	node->object = child;
	node->next = childlist;
	childlist = node;
}

void World::addParticle(Particle *particle){
	if (particlecount < maxparticles){
		particles[particlecount++] = particle;
	}
}

void World::removeParticle(Particle *particle){
	int i;
	for (i = 0; i < particlecount; i++){
		if (particles[i] == particle){
			particles[i] = particles[particlecount-1];
			particlecount--;
			break;
		}
	}
}

ObjectLink *World::addLink(Object *object1, Object *object2, float *point){
	ObjectLink *link = new ObjectLink();
	link->object1 = object1;
	link->object2 = object2;
	if (point != NULL){
		object1->unTransformPoint(link->point1, point);
		object2->unTransformPoint(link->point2, point);
		link->enabled = true;
	} else{
		link->enabled = false;
	}
	objectlinklist *node = new objectlinklist;
	node->link = link;
	node->next = linklist;
	linklist = node;
	return link;
}

void World::renewLink(ObjectLink *link, float *point){
	link->object1->unTransformPoint(link->point1, point);
	link->object2->unTransformPoint(link->point2, point);
	link->enabled = true;
}