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/*
Minetest-c55
Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "collision.h"
#include "mapblock.h"
#include "map.h"

collisionMoveResult collisionMoveSimple(Map *map, f32 pos_max_d,
		const core::aabbox3d<f32> &box_0,
		f32 dtime, v3f &pos_f, v3f &speed_f)
{
	collisionMoveResult result;

	v3f oldpos_f = pos_f;
	v3s16 oldpos_i = floatToInt(oldpos_f, BS);

	/*
		Calculate new position
	*/
	pos_f += speed_f * dtime;

	/*
		Collision detection
	*/
	
	// position in nodes
	v3s16 pos_i = floatToInt(pos_f, BS);
	
	/*
		Collision uncertainty radius
		Make it a bit larger than the maximum distance of movement
	*/
	f32 d = pos_max_d * 1.1;
	// A fairly large value in here makes moving smoother
	//f32 d = 0.15*BS;

	// This should always apply, otherwise there are glitches
	assert(d > pos_max_d);
	
	/*
		Calculate collision box
	*/
	core::aabbox3d<f32> box = box_0;
	box.MaxEdge += pos_f;
	box.MinEdge += pos_f;
	core::aabbox3d<f32> oldbox = box_0;
	oldbox.MaxEdge += oldpos_f;
	oldbox.MinEdge += oldpos_f;

	/*
		If the object lies on a walkable node, this is set to true.
	*/
	result.touching_ground = false;
	
	/*
		Go through every node around the object
		TODO: Calculate the range of nodes that need to be checked
	*/
	for(s16 y = oldpos_i.Y - 1; y <= oldpos_i.Y + 2; y++)
	for(s16 z = oldpos_i.Z - 1; z <= oldpos_i.Z + 1; z++)