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/*
 *  ******************************************************************************
 *  *
 *  *
 *  * This program and the accompanying materials are made available under the
 *  * terms of the Apache License, Version 2.0 which is available at
 *  * https://www.apache.org/licenses/LICENSE-2.0.
 *  *
 *  *  See the NOTICE file distributed with this work for additional
 *  *  information regarding copyright ownership.
 *  * 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.
 *  *
 *  * SPDX-License-Identifier: Apache-2.0
 *  *****************************************************************************
 */

package org.datavec.api.transform.ops;

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NonNull;

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

@AllArgsConstructor
public class DispatchOp implements IAggregableReduceOp, List> {


    @Getter
    @NonNull
    private List>> operations;

    @Override
    public , List>> void combine(W accu) {
        if (accu instanceof DispatchOp) {
            List>> otherOps = ((DispatchOp) accu).getOperations();
            if (operations.size() != otherOps.size())
                throw new IllegalArgumentException(
                                "Tried to combine() incompatible " + this.getClass().getName() + " operators: received "
                                                + otherOps.size() + " operations, expected " + operations.size());
            for (int i = 0; i < Math.min(operations.size(), otherOps.size()); i++) {
                operations.get(i).combine(otherOps.get(i));
            }
        } else
            throw new UnsupportedOperationException("Tried to combine() incompatible " + accu.getClass().getName()
                            + " operator where " + this.getClass().getName() + " expected");
    }

    @Override
    public void accept(List ts) {
        for (int i = 0; i < Math.min(operations.size(), ts.size()); i++) {
            operations.get(i).accept(ts.get(i));
        }
    }

    @Override
    public List get() {
        List res = new ArrayList<>();
        for (int i = 0; i < operations.size(); i++) {
            res.addAll(operations.get(i).get());
        }
        return res;
    }
}