/*******************************************************************************
 * Copyright (c) 2010 Per Kr. Soreide.
 * 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:
 *     Per Kr. Soreide - initial API and implementation
 *******************************************************************************/
package bndtools.release.ui;

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

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

import aQute.bnd.differ.Baseline;
import aQute.bnd.osgi.Constants;
import aQute.bnd.service.diff.Delta;
import aQute.bnd.service.diff.Diff;
import aQute.bnd.service.diff.Tree;
import aQute.bnd.service.diff.Type;

public class TreeContentProvider implements ITreeContentProvider {

    private boolean showAll = false;

    @Override
    public Object[] getChildren(Object parent) {
        if (parent instanceof List) {
            return ((List<?>) parent).toArray();
        }
        if (parent instanceof Baseline) {
            Collection<? extends Diff> diffs = ((Baseline) parent).getDiff()
                .getChildren();
            List<Diff> filteredDiffs = new ArrayList<Diff>();
            for (Diff diff : diffs) {
                switch (diff.getType()) {
                    case API :
                    case MANIFEST :
                    case RESOURCES :
                        if (getChildren(diff).length == 0)
                            continue;
                        break;
                    default :
                        break;
                }
                filteredDiffs.add(diff);
            }
            return filteredDiffs.toArray(new Diff[0]);
        }
        if (parent instanceof Tree) {
            return ((Tree) parent).getChildren();
        }

        if (parent instanceof Diff) {
            return getChildren((Diff) parent);
        }

        return new Object[0];
    }

    private Object[] getChildren(Diff parent) {
        Collection<? extends Diff> diffs = parent.getChildren();
        List<Diff> filteredDiffs = new ArrayList<Diff>();
        for (Diff diff : diffs) {
            if (!showAll && (diff.getDelta() == Delta.IGNORED || diff.getDelta() == Delta.UNCHANGED)) {
                continue;
            }
            if (diff.getType() == Type.SHA) {
                continue;
            }
            if ("META-INF/MANIFEST.MF".equals(diff.getName())) { //$NON-NLS-1$
                continue;
            }
            if (diff.getType() == Type.HEADER && diff.getName()
                .startsWith(Constants.BUNDLE_VERSION)) {
                continue;
            }
            filteredDiffs.add(diff);
        }
        return filteredDiffs.toArray(new Diff[0]);
    }

    @Override
    public Object getParent(Object item) {
        return null;
    }

    /*
     * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
     */
    @Override
    public boolean hasChildren(Object parent) {
        if (parent instanceof Baseline) {
            for (Diff diff : ((Baseline) parent).getDiff()
                .getChildren()) {
                switch (diff.getType()) {
                    case API :
                    case MANIFEST :
                    case RESOURCES :
                        if (getChildren(diff).length > 0)
                            return true;
                        break;
                    default :
                        break;
                }
            }
            return false;
        }

        if (parent instanceof Tree) {
            return ((Tree) parent).getChildren().length > 0;
        }

        if (parent instanceof Diff) {
            Diff diff = (Diff) parent;
            return getChildren(diff).length > 0;
        }

        return false;
    }

    @Override
    public Object[] getElements(Object inputElement) {
        return getChildren(inputElement);
    }

    @Override
    public void dispose() {}

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {}

    public boolean isShowAll() {
        return showAll;
    }

    public void setShowAll(boolean showAll) {
        this.showAll = showAll;
    }
}
