/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.apache.groovy.json.internal;

import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * @author Rick Hightower
 */
public class ValueList extends AbstractList<Object> {

    List<Object> list = new ArrayList<Object>(5);

    private final boolean lazyChop;
    boolean converted = false;

    public ValueList(boolean lazyChop) {
        this.lazyChop = lazyChop;
    }

    public Object get(int index) {
        Object obj = list.get(index);

        if (obj instanceof Value) {
            obj = convert((Value) obj);
            list.set(index, obj);
        }

        chopIfNeeded(obj);
        return obj;
    }

    private static Object convert(Value value) {
        return value.toValue();
    }

    public int size() {
        return list.size();
    }

    public Iterator<Object> iterator() {
        convertAllIfNeeded();
        return list.iterator();
    }

    private void convertAllIfNeeded() {
        if (!converted) {
            converted = true;
            for (int index = 0; index < list.size(); index++) {
                this.get(index);
            }
        }
    }

    public void clear() {
        list.clear();
    }

    public boolean add(Object obj) {
        return list.add(obj);
    }

    public void chopList() {
        for (Object obj : list) {
            if (obj == null) continue;

            if (obj instanceof Value) {
                Value value = (Value) obj;
                if (value.isContainer()) {
                    chopContainer(value);
                } else {
                    value.chop();
                }
            }
        }
    }

    private void chopIfNeeded(Object object) {
        if (lazyChop) {
            if (object instanceof LazyValueMap) {
                LazyValueMap m = (LazyValueMap) object;
                m.chopMap();
            } else if (object instanceof ValueList) {
                ValueList list = (ValueList) object;
                list.chopList();
            }
        }
    }

    static void chopContainer(Value value) {
        Object obj = value.toValue();
        if (obj instanceof LazyValueMap) {
            LazyValueMap map = (LazyValueMap) obj;
            map.chopMap();
        } else if (obj instanceof ValueList) {
            ValueList list = (ValueList) obj;
            list.chopList();
        }
    }

    public List<Object> list() {
        return this.list;
    }
}
