AiAttackSystem

import com.artemis.Entity;
import com.badlogic.gdx.math.Vector2;
import conversion7.gdxg.engine.utils.MathUtilsExt;
import conversion7.spashole.game.artemis_odb.box2d.Box2dBodyComponent;
import conversion7.spashole.game.artemis_odb.box2d.Box2dBodySystem;
import conversion7.spashole.game.utils.SpasholeUtils;

public class AiAttackSystem {

    public static final Vector2 posDiff = new Vector2();

    public static final float CHASE_FROM_DISTANCE = SpasholeUtils.sceneToWorld(200);
    public static final float DELTA_STEP = AiStateMachineSystem.DELTA_STEP;
    public static final float MAKE_SHOT_ON_ANGLE = MathUtilsExt.toRadians(15);
    private static Vector2 moveDirectionWip = new Vector2();

    public static void eval(Entity attackerE, int targetE) {
        Position2dComponent attackerPos = Position2dSystem.components.get(attackerE);
        Position2dComponent targetPos = Position2dSystem.components.get(targetE);
        posDiff.set(targetPos.pos).sub(attackerPos.pos);

        float angleRadToTarget = MathUtilsExt.absRadians(posDiff.angleRad());
        Box2dBodyComponent attackerBody = Box2dBodySystem.components.get(attackerE);
        float attackerAngle = MathUtilsExt.absRadians(attackerBody.body.getAngle());

        float angleDiff = MathUtilsExt.diffAbsoluteRadians(attackerAngle, angleRadToTarget);
        if (Math.abs(angleDiff) < MAKE_SHOT_ON_ANGLE) {
            GunComponent gunComponent = GunSystem.components.get(attackerE);
            gunComponent.makeShot();
        } else {
            float torque;
            if (angleDiff < 0) {
                torque = -MovementConstant.SHIP_PARAMS.torqueForce;
            } else {
                torque = MovementConstant.SHIP_PARAMS.torqueForce;
            }
            // TODO movement constants as component
            Box2dBodySystem.rotate(attackerBody
                    , torque
                    , DELTA_STEP);
        }

        if (posDiff.len() > CHASE_FROM_DISTANCE) {
            // TODO movement constants as component
            MathUtilsExt.angleRadiansToVector(attackerBody.body.getAngle(), moveDirectionWip);
            Box2dBodySystem.move(attackerBody
                    , moveDirectionWip
                    , MovementConstant.SHIP_PARAMS.moveMltpl
                    , DELTA_STEP
                    , true);
        }
    }
}