/*
   base/collision.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2.
*/

#include "base/collision.h"
#include "base/game.h"
#include "base/planet.h"
#include "core/zone.h"
#include "math/functions.h"
#include "math/vector3f.h"

namespace game
{

void Collision::distance_test(core::EntityControlable *first, core::Entity *second)
{
	if (!first->owner())
		return;

	if (first->state() == core::Entity::Docked)
		return;

	// FIXME - use distancesquared
	const float d = math::distance(first->location(), second->location());
	const float r = first->radius() + second->radius();

	if (second->type() == core::Entity::Globe) {
		// collision with a star or a planet

		if ((d - r) < 0.0f) {
			// crash zone
			if ((first->moduletype() == ship_enttype) && (first->state() != core::Entity::Destroyed)) {
				first->owner()->send_warning("^RBOOM!^N");
				static_cast<Ship *>(first)->explode();
				first->entity_speed = 0;
			}
		} else 	if (first->owner()->last_warning() + 5.0f < core::application()->time()) {
			// warning zone: star corona or planet atmosphere
			if ((second->moduletype() == star_enttype)  && (d - r < 50.0f)) {
				first->owner()->send_warning("^3Warning: entering star corona!^N");
			} else if ((second->moduletype() == planet_enttype)   && (d - r < Planet::safe_distance)) {
				first->owner()->send_warning("^3Warning: entering planet gravity well!^N");
			}
		}
	}
}

void Collision::frame_zone(core::Zone *zone)
{
	core::Zone::Content::iterator first;
	core::Zone::Content::iterator second;

	for (first = zone->content().begin(); first != zone->content().end(); first ++) {
		second = first;
		for (second++; second != zone->content().end(); second++) {
			if ((*first)->type() == core::Entity::Controlable) {
				distance_test(static_cast<core::EntityControlable *>((*first)), (*second));
			} else if ((*second)->type() == core::Entity::Controlable) {
				distance_test(static_cast<core::EntityControlable *>((*second)), (*first));
			}
		}
	}
}

void Collision::frame(const float elapsed)
{
	for (core::Zone::Registry::iterator it = core::Zone::registry().begin(); it != core::Zone::registry().end(); it++) {
		frame_zone((*it).second);
	}
}

} // namespace game