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package org.osgl.util;

/*-
 * #%L
 * Java Tool
 * %%
 * Copyright (C) 2014 - 2017 OSGL (Open Source General Library)
 * %%
 * 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.
 * #L%
 */

import org.osgl.$;

import java.util.EnumSet;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.NoSuchElementException;

/**
 * Created with IntelliJ IDEA.
 * User: luog
 * Date: 28/10/13
 * Time: 9:39 PM
 * To change this template use File | Settings | File Templates.
 */
class ReverseList extends DelegatingList implements C.List {

    private ReverseList(C.List list) {
        super(true);
        data = list;
    }

    C.List data() {
        return (C.List)data;
    }

    @Override
    protected EnumSet initFeatures() {
        EnumSet fs = data().features();
        fs.add(C.Feature.READONLY);
        return fs;
    }

    @Override
    public ListIterator listIterator(int index) {
        return new ReverseListIterator(data().listIterator(size() - index));
    }

    @Override
    public T get(int index) {
        return data.get(size() - index - 1);
    }

    @Override
    protected void forEachLeft($.Visitor visitor) throws $.Break {
        data().acceptRight(visitor);
    }

    @Override
    protected void forEachRight($.Visitor visitor) throws $.Break {
        data().acceptLeft(visitor);
    }

    @Override
    public  R reduceLeft(R identity, $.Func2 accumulator) {
        return data().reduceRight(identity, accumulator);
    }

    @Override
    public $.Option reduceLeft($.Func2 accumulator) {
        return data().reduceRight(accumulator);
    }

    @Override
    public  R reduceRight(R identity, $.Func2 accumulator) {
        return data().reduceLeft(identity, accumulator);
    }

    @Override
    public $.Option reduceRight($.Func2 accumulator) {
        return data().reduceLeft(accumulator);
    }

    @Override
    public T head() throws NoSuchElementException {
        return data().last();
    }

    @Override
    public T last() throws NoSuchElementException {
        return data().head();
    }

    @Override
    public Iterator reverseIterator() {
        return data().iterator();
    }

    @Override
    public C.List reverse() {
        return data();
    }

    @Override
    public C.List subList(int fromIndex, int toIndex) {
        return data().subList(toIndex - 1, fromIndex - 1);
    }

    static  C.List wrap(C.List list) {
        if (list instanceof ReverseList) {
            return ((ReverseList)list).data();
        }
        if (list.size() == 0 && list.is(C.Feature.IMMUTABLE)) {
            return Nil.list();
        }
        return new ReverseList(list);
    }
}