/*******************************************************************************
 * Copyright (c) 2005-2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Brad Reynolds - bug 147515
 *     Matthew Hall - bug 221351
 *******************************************************************************/
module org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableList;

import java.lang.all;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.IObserving;
import org.eclipse.core.databinding.observable.list.IListChangeListener;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.ListChangeEvent;
import org.eclipse.core.databinding.observable.list.ObservableList;
import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.core.runtime.Assert;

/**
 * @since 3.2
 * 
 */

public class DetailObservableList : ObservableList , IObserving {

    private bool updating = false;

    private IListChangeListener innerChangeListener = new class() IListChangeListener {
        public void handleListChange(ListChangeEvent event) {
            if (!updating) {
                fireListChange(event.diff);
            }
        }
    };

    private Object currentOuterValue;

    private IObservableList innerObservableList;

    private IObservableFactory factory;

    private IObservableValue outerObservableValue;

    private Object detailType;

    /**
     * @param factory
     * @param outerObservableValue
     * @param detailType
     */
    public this(IObservableFactory factory,
            IObservableValue outerObservableValue, Object detailType) {
        super(outerObservableValue.getRealm(), Collections.EMPTY_LIST, detailType);
        this.factory = factory;
        this.outerObservableValue = outerObservableValue;
        this.detailType = detailType;
        updateInnerObservableList(outerObservableValue);

        outerObservableValue.addValueChangeListener(outerChangeListener);
    }

    IValueChangeListener outerChangeListener = new class() IValueChangeListener {
        public void handleValueChange(ValueChangeEvent event) {
            List oldList = new ArrayList(wrappedList);
            updateInnerObservableList(outerObservableValue);
            fireListChange(Diffs.computeListDiff(oldList, wrappedList));
        }
    };

    private void updateInnerObservableList(IObservableValue outerObservableValue) {
        if (innerObservableList !is null) {
            innerObservableList.removeListChangeListener(innerChangeListener);
            innerObservableList.dispose();
        }
        currentOuterValue = outerObservableValue.getValue();
        if (currentOuterValue is null) {
            innerObservableList = null;
            wrappedList = Collections.EMPTY_LIST;
        } else {
            this.innerObservableList = cast(IObservableList) factory
                    .createObservable(currentOuterValue);
            wrappedList = innerObservableList;

            if (detailType !is null) {
                Object innerValueType = innerObservableList.getElementType();
                Assert.isTrue(getElementType().equals(innerValueType),
                        "Cannot change value type in a nested observable list"); //$NON-NLS-1$
            }
            innerObservableList.addListChangeListener(innerChangeListener);
        }
    }

    public bool add(Object o) {
        return wrappedList.add(o);
    }

    public void add(int index, Object element) {
        wrappedList.add(index, element);
    }

    public bool remove(Object o) {
        return wrappedList.remove(o);
    }

    public Object set(int index, Object element) {
        return wrappedList.set(index, element);
    }

    public Object move(int oldIndex, int newIndex) {
        if (innerObservableList !is null)
            return innerObservableList.move(oldIndex, newIndex);
        return super.move(oldIndex, newIndex);
    }

    public Object remove(int index) {
        return wrappedList.remove(index);
    }

    public bool addAll(Collection c) {
        return wrappedList.addAll(c);
    }

    public bool addAll(int index, Collection c) {
        return wrappedList.addAll(index, c);
    }

    public bool removeAll(Collection c) {
        return wrappedList.removeAll(c);
    }

    public bool retainAll(Collection c) {
        return wrappedList.retainAll(c);
    }

    public void clear() {
        wrappedList.clear();
    }
    
    public void dispose() {
        super.dispose();

        if (outerObservableValue !is null) {
            outerObservableValue.removeValueChangeListener(outerChangeListener);
            outerObservableValue.dispose();
        }
        if (innerObservableList !is null) {
            innerObservableList.removeListChangeListener(innerChangeListener);
            innerObservableList.dispose();
        }
        currentOuterValue = null;
        factory = null;
        innerObservableList = null;
        innerChangeListener = null;
    }

    public Object getObserved() {
        if ( null !is cast(IObserving)innerObservableList ) {
            return (cast(IObserving) innerObservableList).getObserved();
        }
        return null;
    }
}