/*
 * 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 org.apache.hadoop.chukwa.extraction.demux.processor.reducer;


import java.io.IOException;
import java.util.Iterator;
import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.log4j.Logger;

public class SystemMetrics implements ReduceProcessor {
  static Logger log = Logger.getLogger(SystemMetrics.class);

  @Override
  public String getDataType() {
    return this.getClass().getName();
  }

  @Override
  public void process(ChukwaRecordKey key, Iterator<ChukwaRecord> values,
      OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter) {
    try {

      ChukwaRecord record = null;
      ChukwaRecord newRecord = new ChukwaRecord();

      while (values.hasNext()) {
        record = values.next();
        newRecord.setTime(record.getTime());

        if (record.containsField("IFACE")) {
          if (record.containsField("rxpck/s")) {
            if (record.containsField("rxbyt/s")
                && record.containsField("txbyt/s")) {
              double netBusyPcnt = 0, netRxByts = 0, netTxByts = 0, netSpeed = 128000000.00;
              netRxByts = Double.parseDouble(record.getValue("rxbyt/s"));
              netTxByts = Double.parseDouble(record.getValue("txbyt/s"));
              netBusyPcnt = (netRxByts / netSpeed * 100)
                  + (netTxByts / netSpeed * 100);
              record.add(record.getValue("IFACE") + "_busy_pcnt", ""
                  + netBusyPcnt);
              record.add("csource", record.getValue("csource"));
            }
            record.add(record.getValue("IFACE") + ".rxbyt/s", record
                .getValue("rxbyt/s"));
            record.add(record.getValue("IFACE") + ".rxpck/s", record
                .getValue("rxpck/s"));
            record.add(record.getValue("IFACE") + ".txbyt/s", record
                .getValue("txbyt/s"));
            record.add(record.getValue("IFACE") + ".txpck/s", record
                .getValue("txpck/s"));
            record.removeValue("rxbyt/s");
            record.removeValue("rxpck/s");
            record.removeValue("txbyt/s");
            record.removeValue("txpck/s");
          }
          if (record.containsField("rxerr/s")) {
            record.add(record.getValue("IFACE") + ".rxerr/s", record
                .getValue("rxerr/s"));
            record.add(record.getValue("IFACE") + ".rxdrop/s", record
                .getValue("rxdrop/s"));
            record.add(record.getValue("IFACE") + ".txerr/s", record
                .getValue("txerr/s"));
            record.add(record.getValue("IFACE") + ".txdrop/s", record
                .getValue("txdrop/s"));
            record.removeValue("rxerr/s");
            record.removeValue("rxdrop/s");
            record.removeValue("txerr/s");
            record.removeValue("txdrop/s");
          }
          record.removeValue("IFACE");
        }

        if (record.containsField("Device:")) {
          record.add(record.getValue("Device:") + ".r/s", record
              .getValue("r/s"));
          record.add(record.getValue("Device:") + ".w/s", record
              .getValue("w/s"));
          record.add(record.getValue("Device:") + ".rkB/s", record
              .getValue("rkB/s"));
          record.add(record.getValue("Device:") + ".wkB/s", record
              .getValue("wkB/s"));
          record.add(record.getValue("Device:") + ".%util", record
              .getValue("%util"));
          record.removeValue("r/s");
          record.removeValue("w/s");
          record.removeValue("rkB/s");
          record.removeValue("wkB/s");
          record.removeValue("%util");
          record.removeValue("Device:");
        }

        if (record.containsField("swap_free")) {
          float swapUsedPcnt = 0, swapUsed = 0, swapTotal = 0;
          swapUsed = Long.parseLong(record.getValue("swap_used"));
          swapTotal = Long.parseLong(record.getValue("swap_total"));
          swapUsedPcnt = swapUsed / swapTotal * 100;
          record.add("swap_used_pcnt", "" + swapUsedPcnt);
          record.add("csource", record.getValue("csource"));
        }

        if (record.containsField("mem_used")) {
          double memUsedPcnt = 0, memTotal = 0, memUsed = 0;
          memTotal = Double.parseDouble(record.getValue("mem_total"));
          memUsed = Double.parseDouble(record.getValue("mem_used"));
          memUsedPcnt = memUsed / memTotal * 100;
          record.add("mem_used_pcnt", "" + memUsedPcnt);
          record.add("csource", record.getValue("csource"));
        }

        if (record.containsField("mem_buffers")) {
          double memBuffersPcnt = 0, memTotal = 0, memBuffers = 0;
          memTotal = Double.parseDouble(record.getValue("mem_total"));
          memBuffers = Double.parseDouble(record.getValue("mem_buffers"));
          memBuffersPcnt = memBuffers / memTotal * 100;
          record.add("mem_buffers_pcnt", "" + memBuffersPcnt);
          record.add("csource", record.getValue("csource"));
        }

        // Copy over all fields
        String[] fields = record.getFields();
        for (String f : fields) {
          newRecord.add(f, record.getValue(f));
        }
      }
      record.add("capp", "systemMetrics");
      output.collect(key, newRecord);
    } catch (IOException e) {
      log.warn("Unable to collect output in SystemMetricsReduceProcessor ["
          + key + "]", e);
      e.printStackTrace();
    }

  }
}