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package com.wavefront.ingester;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageDecoder;

/**
 * Given a raw graphite line, look for any host tag, and add it if implicit. Does not perform full
 * decoding, though.
 */
public class GraphiteHostAnnotator extends MessageToMessageDecoder {

  private final String hostName;
  private final List sourceTags = new ArrayList<>();

  public GraphiteHostAnnotator(String hostName, final List customSourceTags) {
    this.hostName = hostName;
    this.sourceTags.add("source=");
    this.sourceTags.add("host=");
    this.sourceTags.addAll(customSourceTags.stream().map(customTag -> customTag + "=").collect(Collectors.toList()));
  }

  // Decode from a possibly host-annotated graphite string to a definitely host-annotated graphite string.
  @Override
  protected void decode(ChannelHandlerContext ctx, String msg, List