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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package org.glassfish.admin.amx.impl.mbean;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import org.glassfish.admin.amx.core.AMXProxy;
import org.glassfish.admin.amx.util.StringUtil;

final class ParentChildren implements Comparable {

    final AMXProxy mParent;
    final List mChildren;

    public ParentChildren(final AMXProxy parent, final List children) {
        mParent = parent;
        mChildren = children;
    }

    public void sortChildren() {
        Collections.sort(mChildren);
    }
    
    @Override
    public boolean equals(final Object rhs) {
        return rhs instanceof ParentChildren ? compareTo((ParentChildren)rhs) == 0 : false;
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 83 * hash + (this.mParent != null ? this.mParent.hashCode() : 0);
        hash = 83 * hash + (this.mChildren != null ? this.mChildren.hashCode() : 0);
        return hash;
    }

    @Override
    public int compareTo(final ParentChildren rhs) {
        int cmp = mParent.type().compareTo(rhs.mParent.type());
        if (cmp == 0) {
            cmp = mParent.nameProp().compareTo(rhs.mParent.nameProp());
        }

        if (cmp == 0) {
            cmp = mChildren.size() - rhs.mChildren.size();
        }

        return cmp;
    }

    public AMXProxy parent() {
        return mParent;
    }

    public List children() {
        return mChildren;
    }

    public List toLines(final boolean details) {
        sortChildren();
        final List lines = new ArrayList();

        lines.add(descriptionFor(mParent));

        for (final ParentChildren child : mChildren) {
            final List moreLines = indentAll(child.toLines(details));
            lines.addAll(moreLines);
        }
        return lines;
    }

    public List asList() {
        final List items = new ArrayList();

        items.add(mParent);
        for (final ParentChildren child : mChildren) {
            items.addAll(child.asList());
        }
        return items;
    }

    public static ParentChildren hierarchy(final AMXProxy top) {
        // make a list of all children, grouping by type
        final List children = new ArrayList();
        final Map> childrenMaps = top.childrenMaps();
        for (final Map childrenOfType : childrenMaps.values()) {
            for (final AMXProxy amx : childrenOfType.values()) {
                children.add(amx);
            }
        }

        final List pcList = new ArrayList();
        for (final AMXProxy child : children) {
            final ParentChildren pc = hierarchy(child);
            pcList.add(pc);
        }

        final ParentChildren result = new ParentChildren(top, pcList);
        result.sortChildren();
        return result;
    }

    public static String descriptionFor(final AMXProxy proxy) {
        String desc = proxy.type();
        final String name = proxy.nameProp();
        if (name != null) {
            desc = desc + "=" + name;
        }

        return desc;
    }

    private static List indentAll(final List lines) {
        final List linesIndented = new ArrayList();
        final String INDENT = "   ";
        for (final String line : lines) {
            linesIndented.add(INDENT + line);
        }
        return linesIndented;
    }

    public static String getHierarchyString(final AMXProxy top) {
        final ParentChildren pc = hierarchy(top);

        return StringUtil.toLines(pc.toLines(true));
    }
}