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/*******************************************************************************
 * Copyright (C) 2007, 2015:
 * 
 * - Ferdinando Villa  - integratedmodelling.org - any
 * other authors listed in @author annotations
 *
 * All rights reserved. This file is part of the k.LAB software suite, meant to enable
 * modular, collaborative, integrated development of interoperable data and model
 * components. For details, see http://integratedmodelling.org.
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms
 * of the Affero General Public License Version 3 or 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the Affero General Public License along with this
 * program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite
 * 330, Boston, MA 02111-1307, USA. The license is also available at:
 * https://www.gnu.org/licenses/agpl.html
 *******************************************************************************/
package org.integratedmodelling.engine.modelling;

import java.util.HashMap;

import org.integratedmodelling.api.modelling.IExtent;
import org.integratedmodelling.api.modelling.IScale;
import org.integratedmodelling.api.modelling.IState;
import org.integratedmodelling.common.states.State;
import org.integratedmodelling.engine.modelling.runtime.Scale;

/**
 * For now, this will only work on IObjectState, because those are the states which can
 * store values for objects. No other states would reasonably need to be generated by a
 * factory.
 * 
 * NOTE: new states are created with a null observer because it should not be necessary.
 * see comment on IState.getObserver()
 * 
 * @author luke
 * 
 */
public class StateFactory {
    private static final StateFactory instance = new StateFactory();

    private abstract class StateGenerator {
        abstract State generateFrom(IState original, IScale newScale);
    }

    /*
     * FIXME this should have become unnecessary now that all the polimorphism is
     * encapsulated within State and there is only one State class in common. Check with
     * Luke when everything is stable.
     */
    private final HashMap, StateGenerator> stateGenerators = new HashMap, StateGenerator>() {
        // default
        // serial
        // ID
        private static final long serialVersionUID = 1L;

        {
            put(State.class, new StateGenerator() {
                @Override
                // FIXME
                // see
                // what
                // to
                // do
                // with
                // dynamic
                // state
                State generateFrom(IState original, IScale newScale) {
                    State result = new State(original
                            .getObservable().getSemantics(), newScale, true, /*
                                                               * FIXME not sure this is
                                                               * used; for now no
                                                               * probabilistic outcome is
                                                               * possible
                                                               */ false, ((State) original)
                                    .getContextObservation());
                    return result;
                }
            });
            // put(ConstObjectState.class,
            // new
            // StateGenerator()
            // {
            // @Override
            // ConstObjectState
            // generateFrom(IState
            // original,
            // IScale
            // newScale)
            // {
            // ConstObjectState
            // result =
            // new
            // ConstObjectState(original
            // .getObservable(),
            // newScale,
            // null,
            // null);
            // return
            // result;
            // }
            // });
        }
    };

    public static IState getEmptyClone(IState original, IScale targetScale) {
        StateGenerator generator = instance.stateGenerators.get(original.getClass());

        // TODO remove this when we can be more flexible.
        // it's too early to use the dynamic-state-creation; we're currently locked into
        // returning ObjectState
        // objects
        generator = instance.stateGenerators.get(State.class);

        IScale newScale = new Scale(new IExtent[] { targetScale.getSpace() });
        IState result = generator.generateFrom(original, newScale);
        return result;
    }
}