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/**
 * Copyright 2012 Lyncode
 *
 * 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.
 */

package com.lyncode.jtwig.functions.internal.list;

import com.lyncode.jtwig.functions.JtwigFunction;
import com.lyncode.jtwig.functions.annotations.JtwigFunctionDeclaration;
import com.lyncode.jtwig.functions.exceptions.FunctionException;
import com.lyncode.jtwig.functions.util.ObjectIterator;

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

import static com.lyncode.jtwig.functions.util.Requirements.between;
import static com.lyncode.jtwig.functions.util.Requirements.requires;
import static org.hamcrest.core.IsInstanceOf.instanceOf;

@JtwigFunctionDeclaration(name = "batch")
public class Batch implements JtwigFunction {
    @Override
    public Object execute(Object... arguments) throws FunctionException {
        requires(arguments)
                .withNumberOfArguments(between(2, 3))
                .withArgument(1, instanceOf(Integer.class));

        ObjectIterator iterator = new ObjectIterator(arguments[0]);
        int groupSize = (Integer) arguments[1];
        boolean end = false;
        List> result = new ArrayList>();
        while (iterator.hasNext()) {
            List