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/*
 * Copyright 2013-2018 Guardtime, Inc.
 *
 *  This file is part of the Guardtime client SDK.
 *
 *  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, CONDITIONS, OR OTHER LICENSES OF ANY KIND, either
 *  express or implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 *  "Guardtime" and "KSI" are trademarks or registered trademarks of
 *  Guardtime, Inc., and no license to trademarks is granted; Guardtime
 *  reserves and retains all trademark rights.
 *
 */
package com.guardtime.ksi;

import com.guardtime.ksi.exceptions.KSIException;
import com.guardtime.ksi.pdu.ExtensionResponse;
import com.guardtime.ksi.publication.PublicationRecord;
import com.guardtime.ksi.service.Future;
import com.guardtime.ksi.service.KSIProtocolException;
import com.guardtime.ksi.unisignature.CalendarHashChain;
import com.guardtime.ksi.unisignature.KSISignature;
import com.guardtime.ksi.unisignature.KSISignatureComponentFactory;
import com.guardtime.ksi.unisignature.KSISignatureFactory;
import com.guardtime.ksi.unisignature.SignaturePublicationRecord;

import static com.guardtime.ksi.unisignature.CalendarHashChainUtil.areRightLinksConsistent;
import static java.util.Arrays.asList;

/**
 * The future of the signature extension process.
 *
 * @see Future
 */
public final class ExtensionFuture implements Future {

    private final Future future;
    private final PublicationRecord publicationRecord;
    private final KSISignature signature;
    private final KSISignatureFactory signatureFactory;
    private final KSISignatureComponentFactory signatureComponentFactory;

    private KSISignature extendedSignature;

    public ExtensionFuture(Future future, PublicationRecord publicationRecord, KSISignature signature,
                           KSISignatureComponentFactory signatureComponentFactory, KSISignatureFactory signatureFactory) {
        this.future = future;
        this.publicationRecord = publicationRecord;
        this.signature = signature;
        this.signatureComponentFactory = signatureComponentFactory;
        this.signatureFactory = signatureFactory;
    }

    public KSISignature getResult() throws KSIException {
        if (extendedSignature == null) {
            try {
                ExtensionResponse extensionResponse = future.getResult();
                CalendarHashChain calendarHashChain = signatureComponentFactory.createCalendarHashChain(extensionResponse.getCalendarHashChain());
                if (signature.getCalendarHashChain() != null && !areRightLinksConsistent(signature.getCalendarHashChain(), calendarHashChain)) {
                    throw new InconsistentCalendarHashChainException("Right links of signature calendar hash chain and extended calendar hash chain do not match");
                }
                SignaturePublicationRecord publication = signatureComponentFactory.createPublicationRecord(publicationRecord.getPublicationData(), publicationRecord.getPublicationReferences(), publicationRecord.getPublicationRepositoryURIs());
                extendedSignature = signatureFactory.createSignature(asList(signature.getAggregationHashChains()), calendarHashChain, null, publication, signature.getRfc3161Record());
            } catch (com.guardtime.ksi.tlv.TLVParserException e) {
                throw new KSIProtocolException("Can't parse response message", e);
            }
        }
        return extendedSignature;
    }

    public boolean isFinished() {
        return future.isFinished();
    }
}