package vsa.game.framework.impl;

import vsa.game.framework.Action;
import vsa.game.framework.Configuration;
import vsa.game.framework.Looper;
import vsa.game.framework.State;
import vsa.game.framework.StateDriver;

public class StateManager<GameData> implements Looper
{
    private boolean running = true;;
    private State<GameData> currentState;
    private Configuration<GameData> conf;
    private GameData context;

    public StateManager(Configuration<GameData> conf, GameData context)
    {
        this.conf = conf;
        this.context = context;
    }

    @Override
    public void runEventLoop()
    {
        currentState.initialize(conf, context);
        while (running)
        {
            if (!(transition(currentState)))
            {
                Action<GameData> a = conf.getActionSelector().selectAction(conf, currentState, context);
                a.execute(conf, context);
                transition(a);
            }
        }
    }

    private boolean transition(StateDriver<GameData> driver)
    {
        State<GameData> next = driver.getNextState();
        if (next != null)
        {
            currentState = next;
            currentState.initialize(conf, context);
            return true;
        }
        return false;
    }

    public void setStartState(State<GameData> state)
    {
        currentState = state;
    }

    @Override
    public void stopEventLoop()
    {
        running = false;
    }

}