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/*
 *
 *  Copyright 2016,2017 DTCC, Fujitsu Australia Software Technology, IBM - All Rights Reserved.
 *
 *  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 org.hyperledger.fabric.sdk;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

import com.google.protobuf.ByteString;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequenceGenerator;
import org.hyperledger.fabric.sdk.exception.InvalidArgumentException;
import org.hyperledger.fabric.sdk.security.CryptoSuite;

public class SDKUtils {
    private SDKUtils() {

    }

    public static CryptoSuite suite = null;

    /**
     * used asn1 and get hash
     *
     * @param blockNumber
     * @param previousHash
     * @param dataHash
     * @return byte[]
     * @throws IOException
     * @throws InvalidArgumentException
     */
    public static byte[] calculateBlockHash(long blockNumber, byte[] previousHash, byte[] dataHash) throws IOException, InvalidArgumentException {

        if (previousHash == null) {
            throw new InvalidArgumentException("previousHash parameter is null.");
        }
        if (dataHash == null) {
            throw new InvalidArgumentException("dataHash parameter is null.");
        }

        if (null == suite) {
            suite = CryptoSuite.Factory.getCryptoSuite();
        }

        ByteArrayOutputStream s = new ByteArrayOutputStream();
        DERSequenceGenerator seq = new DERSequenceGenerator(s);
        seq.addObject(new ASN1Integer(blockNumber));
        seq.addObject(new DEROctetString(previousHash));
        seq.addObject(new DEROctetString(dataHash));
        seq.close();
        return suite.hash(s.toByteArray());

    }

    /**
     * Check that the proposals all have consistent read write sets
     *
     * @param proposalResponses
     * @return A Collection of sets where each set has consistent proposals.
     * @throws InvalidArgumentException
     */

    public static Collection> getProposalConsistencySets(Collection proposalResponses
    ) throws InvalidArgumentException {

        return getProposalConsistencySets(proposalResponses, new HashSet());

    }

    /**
     * Check that the proposals all have consistent read write sets
     *
     * @param proposalResponses
     * @param invalid           proposals that were found to be invalid.
     * @return A Collection of sets where each set has consistent proposals.
     * @throws InvalidArgumentException
     */

    public static Collection> getProposalConsistencySets(Collection proposalResponses,
                                                                               Set invalid) throws InvalidArgumentException {

        if (proposalResponses == null) {
            throw new InvalidArgumentException("proposalResponses collection is null");
        }

        if (proposalResponses.isEmpty()) {
            throw new InvalidArgumentException("proposalResponses collection is empty");
        }

        if (null == invalid) {
            throw new InvalidArgumentException("invalid set is null.");
        }

        HashMap> ret = new HashMap<>();

        for (ProposalResponse proposalResponse : proposalResponses) {

            if (proposalResponse.isInvalid() || proposalResponse.getProposalResponse() == null) {
                invalid.add(proposalResponse);
            } else {

                ByteString rwsetByteString = proposalResponse.getProposalResponsePayloadDeserializer()
                        .getExtension().getChaincodeAction().getResults();

                Set set = ret.computeIfAbsent(rwsetByteString, k -> new HashSet<>());

                set.add(proposalResponse);
            }

        }

        return ret.values();

    }
}