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/*
 * Copyright 2021 Red Hat
 *
 * 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 io.apicurio.registry.utils.export;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.codec.digest.DigestUtils;
import io.apicurio.registry.rest.beans.VersionMetaData;
import io.apicurio.registry.utils.impexp.ContentEntity;
import io.apicurio.registry.utils.impexp.EntityWriter;

/**
 * @author Fabian Martinez
 */
public class MatchContentIdContentExporter implements ContentExporter {

    private EntityWriter writer;

    private Map contentIndex = new HashMap<>();


    public MatchContentIdContentExporter(EntityWriter writer) {
        this.writer = writer;
    }

    /**
     * @see io.apicurio.registry.utils.export.ContentExporter#writeContent(java.lang.String, java.lang.String, byte[], io.apicurio.registry.rest.beans.VersionMetaData)
     */
    @Override
    public Long writeContent(String contentHash, String canonicalContentHash, byte[] contentBytes, VersionMetaData meta) {

        byte[] content = contentBytes;
        String hash = contentHash;
        while(contentIndex.containsKey(hash)) {
            content = new StringBuilder(new String(content)).append(" ".getBytes()).toString().getBytes();
            hash = DigestUtils.sha256Hex(content);
        }

        contentIndex.put(hash, meta.getGlobalId());

        ContentEntity contentEntity = new ContentEntity();
        contentEntity.contentId = meta.getGlobalId();
        contentEntity.contentHash = hash;
        contentEntity.canonicalHash = canonicalContentHash;
        contentEntity.contentBytes = content;

        try {
            writer.writeEntity(contentEntity);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return contentEntity.contentId;
    }

}