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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.pinterest.secor.parser;

import java.io.IOException;
import java.util.regex.Pattern;

import com.google.protobuf.Descriptors;
import com.google.protobuf.util.Timestamps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.protobuf.CodedInputStream;
import com.pinterest.secor.common.SecorConfig;
import com.pinterest.secor.message.Message;
import com.pinterest.secor.util.ProtobufUtil;

/**
 * Protocol buffer message timestamp extractor
 * 
 * If secor.protobuf.message.class is not set assumes that the very
 * first uint64 field in a message is the timestamp. Otherwise,
 * uses message.timestamp.name as a path to get to the timestamp
 * field within protobuf message.
 *
 * @author Liam Stewart ([email protected])
 */
public class ProtobufMessageParser extends TimestampedMessageParser {

    private static final Logger LOG = LoggerFactory.getLogger(ProtobufMessageParser.class);

    private ProtobufUtil protobufUtil;
    private String[] timestampFieldPath;

    public ProtobufMessageParser(SecorConfig config) {
        super(config);

        protobufUtil = new ProtobufUtil(config);
        if (protobufUtil.isConfigured()) {
            String timestampFieldName = mConfig.getMessageTimestampName();
            String timestampFieldSeparator = mConfig.getMessageTimestampNameSeparator();
            if (timestampFieldSeparator == null || timestampFieldSeparator.isEmpty()) {
                timestampFieldSeparator = ".";
            }
            LOG.info("Using protobuf timestamp field path: {} with separator: {}", timestampFieldName,
                    timestampFieldSeparator);
            timestampFieldPath = timestampFieldName.split(Pattern.quote(timestampFieldSeparator));
        } else {
            LOG.info(
                    "Protobuf message class is not configured, will assume that timestamp is the first uint64 field");
        }
    }

    @Override
    public long extractTimestampMillis(final Message message) throws IOException {
        return extractTimestampMillis(message.getTopic(), message.getPayload());
    }

    public long extractTimestampMillis(String topic, final byte[] bytes) throws IOException {
        if (timestampFieldPath != null) {
            com.google.protobuf.Message decodedMessage = protobufUtil.decodeProtobufOrJsonMessage(topic,
                    bytes);
            int i = 0;
            for (; i < timestampFieldPath.length - 1; ++i) {
                decodedMessage = (com.google.protobuf.Message) decodedMessage
                        .getField(decodedMessage.getDescriptorForType().findFieldByName(timestampFieldPath[i]));
            }
            Object timestampObject = decodedMessage
                    .getField(decodedMessage.getDescriptorForType().findFieldByName(timestampFieldPath[i]));
            if (timestampObject instanceof com.google.protobuf.Timestamp){
                return Timestamps.toMillis((com.google.protobuf.Timestamp) timestampObject);
            }else {
                return toMillis((Long) timestampObject);
            }
        } else {
            // Assume that the timestamp field is the first field, is required,
            // and is a uint64.

            CodedInputStream input = CodedInputStream.newInstance(bytes);
            // Don't really care about the tag, but need to read it to get, to
            // the payload.
            input.readTag();
            return toMillis(input.readUInt64());
        }
    }
}