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/*
 * Copyright 2013-2014 Richard M. Hightower
 * Licensed 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.
 *
 * __________                              _____          __   .__
 * \______   \ ____   ____   ____   /\    /     \ _____  |  | _|__| ____    ____
 *  |    |  _//  _ \ /  _ \ /    \  \/   /  \ /  \\__  \ |  |/ /  |/    \  / ___\
 *  |    |   (  <_> |  <_> )   |  \ /\  /    Y    \/ __ \|    <|  |   |  \/ /_/  >
 *  |______  /\____/ \____/|___|  / \/  \____|__  (____  /__|_ \__|___|  /\___  /
 *         \/                   \/              \/     \/     \/       \//_____/
 *      ____.                     ___________   _____    ______________.___.
 *     |    |____ ___  _______    \_   _____/  /  _  \  /   _____/\__  |   |
 *     |    \__  \\  \/ /\__  \    |    __)_  /  /_\  \ \_____  \  /   |   |
 * /\__|    |/ __ \\   /  / __ \_  |        \/    |    \/        \ \____   |
 * \________(____  /\_/  (____  / /_______  /\____|__  /_______  / / ______|
 *               \/           \/          \/         \/        \/  \/
 */

package org.boon.core.value;


import org.boon.core.Value;
import org.boon.primitive.Arry;

import java.util.*;

import static org.boon.Exceptions.die;

/**
 * This map is for object serialization mainly.
 * The idea is the final conversion of
 * the Value objects are delayed until the last possible moment, i.e., just before injected into a bean.
 */
public class ValueMapImpl extends AbstractMap implements ValueMap  {

    /** The internal map to hold the Value map. */
    private Map map = null;

    /** The items held in the map. */
    private Entry[] items = new Entry[ 20 ];

    /* The current length of the map. */
    private int len = 0;


    /**
     * Add a MapItemValue to the map.
     * @param miv map value item.
     */
    @Override
    public void add( MapItemValue miv ) {
        if ( len >= items.length ) {
            items = Arry.grow(items);
        }
        items[ len ] = miv;
        len++;
    }

    @Override
    public int len() {
        return len;
    }

    @Override
    public boolean hydrated() {
        return map!=null;
    }

    @Override
    public Entry[] items() {
        return  items;
    }


    /**
     * Get the items for the key.
     * @param key
     * @return
     */
    @Override
    public Value get( Object key ) {
        /* If the length is under and we are asking for the key, then just look for the key. Don't build the map. */
        if ( map == null && items.length < 20 ) {
            for ( Object item : items ) {
                MapItemValue miv = ( MapItemValue ) item;
                if ( key.equals( miv.name.toValue() ) ) {
                    return miv.value;
                }
            }
            return null;
        } else {
            if ( map == null ) buildIfNeededMap();
            return map.get( key );
        }
    }


    @Override
    public Value put( String key, Value value ) {
        die( "Not that kind of map" );
        return null;
    }


    /** If the map has not been built yet, then we just return a fake entry set. */
    @Override
    public Set> entrySet() {
        buildIfNeededMap();
        return map.entrySet();
    }

    /** Build the map if requested to, it does this lazily. */
    private final void buildIfNeededMap() {
        if ( map == null ) {
            map = new HashMap<>( items.length );

            for ( Entry miv : items ) {
                if ( miv == null ) {
                    break;
                }
                map.put( miv.getKey(), miv.getValue() );
            }
        }
    }


    /** Return a collection of values. */
    public Collection values() {
        this.buildIfNeededMap();
        return map.values();
    }


    /**
     * Return the size of the map. Use the map if it has already been created.
     * @return size
     */
    public int size() {
        this.buildIfNeededMap();
        return map.size();
    }

}