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

// project headers
#include "game/game.h"
#include "game/ship.h"
#include "math/mathlib.h"

// C++ headers
#include <iostream>

using math::degrees360f;
using math::degrees180f;

namespace game {

Ship::Ship() : core::EntityControlable(0)
{
	type = ship_enttype;

	// ship specs
	acceleration = 1.5f;
	max_speed = 4.0f;
	turn_speed = 0.5f;
}

Ship::~Ship() 
{
}

void Ship::frame(float seconds) 
{

	if (target_thrust < 0) target_thrust = 0.0f;
	else if(target_thrust > 1) target_thrust = 1.0f;

	// update direction
	float direction_offset = degrees180f(target_direction - direction);
	float d = turn_speed * seconds * direction_offset;
	direction = degrees360f(direction + d);

	// update speed
	if (speed < target_thrust * max_speed) {
		speed += acceleration * seconds;
		if (speed > target_thrust * max_speed) {
			speed = target_thrust * max_speed;
		}
	} else if(speed > target_thrust * max_speed) {
		speed -= acceleration * seconds;
		if (speed < 0) speed = 0;
	}

	// location TODO avoid sin/cos calculations
	location.x += cosf(direction * M_PI / 180) * speed * seconds;
	location.z -= sinf(direction * M_PI / 180) * speed * seconds;
}

} // namespace game