/*
 * Copyright (c) 2008, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *
 * -----------------------------------------------------------------
 *
 * SensorDataAggregator
 *
 * Authors : Joakim Eriksson, Niclas Finne
 * Created : 20 aug 2008
 * Updated : $Date: 2010/11/03 14:53:05 $
 *           $Revision: 1.1 $
 */

package org.contikios.contiki.collect;

/**
 *
 */
public class SensorDataAggregator implements SensorInfo {

  private final Node node;
  private long[] values;
  private int minSeqno = Integer.MAX_VALUE;
  private int maxSeqno = Integer.MIN_VALUE;
  private int seqnoDelta = 0;
  private int dataCount;
  private int duplicates = 0;
  private int lost = 0;
  private int nodeRestartCount = 0;
  private int nextHopChangeCount = 0;
  private int lastNextHop = -1;
  private long shortestPeriod = Long.MAX_VALUE;
  private long longestPeriod = 0;

  public SensorDataAggregator(Node node) {
    this.node = node;
    this.values = new long[VALUES_COUNT];
  }

  public Node getNode() {
    return node;
  }

  public String getNodeID() {
    return node.getID();
  }

  public long getValue(int index) {
    return values[index];
  }

  public double getAverageValue(int index) {
      return dataCount > 0 ? (double)values[index] / (double)dataCount : 0;
  }

  public int getValueCount() {
    return values.length;
  }

  public int getDataCount() {
    return dataCount;
  }

  public void addSensorData(SensorData data) {
    int seqn = data.getValue(SEQNO);
    int s = seqn + seqnoDelta;

    int bestNeighbor = data.getValue(BEST_NEIGHBOR);
    if (lastNextHop != bestNeighbor && lastNextHop >= 0) {
      nextHopChangeCount++;
    }
    lastNextHop = bestNeighbor;

    if (s <= maxSeqno) {
      // Check for duplicates among the last 5 packets
      for(int n = node.getSensorDataCount() - 1, i = n > 5 ? n - 5 : 0; i < n; i++) {
        SensorData sd = node.getSensorData(i);
        if (sd.getValue(SEQNO) != seqn || sd == data || sd.getValueCount() != data.getValueCount()) {
          // Not a duplicate
        } else if (Math.abs(data.getNodeTime() - sd.getNodeTime()) > 180000) {
          // Too long time between packets. Not a duplicate.
//          System.err.println("Too long time between packets with same seqno from "
//                  + data.getNode() + ": "
//                  + (Math.abs(data.getNodeTime() - sd.getNodeTime()) / 1000)
//                  + " sec, " + (n - i) + " packets ago");
        } else {
          data.setDuplicate(true);

          // Verify that the packet is a duplicate
          for(int j = DATA_LEN2, m = data.getValueCount(); j < m; j++) {
            if (sd.getValue(j) != data.getValue(j)) {
              data.setDuplicate(false);
//              System.out.println("NOT Duplicate: " + data.getNode() + " ("
//                  + (n - i) + ": "
//                  + ((data.getNodeTime() - sd.getNodeTime()) / 1000) + "sek): "
//                  + seqn + " value[" + j + "]: " + sd.getValue(j) + " != "
//                  + data.getValue(j));
              break;
            }
          }
          if (data.isDuplicate()) {
//            System.out.println("Duplicate: " + data.getNode() + ": " + seqn
//                + ": "
//                + (Math.abs(data.getNodeTime() - sd.getNodeTime()) / 1000)
//                + " sec, " + (n - i) + " packets ago");
            duplicates++;
            break;
          }
        }
      }
    }

    if (!data.isDuplicate()) {
      for (int i = 0, n = Math.min(VALUES_COUNT, data.getValueCount()); i < n; i++) {
        values[i] += data.getValue(i);
      }

      if (node.getSensorDataCount() > 1) {
        long timeDiff = data.getNodeTime() - node.getSensorData(node.getSensorDataCount() - 2).getNodeTime();
        if (timeDiff > longestPeriod) {
          longestPeriod = timeDiff;
        }
        if (timeDiff < shortestPeriod) {
          shortestPeriod = timeDiff;
        }
      }
      if (dataCount == 0) {
        // First packet from node.
      } else if (maxSeqno - s > 2) {
        // Handle sequence number overflow.
        seqnoDelta = maxSeqno + 1;
        s = seqnoDelta + seqn;
        if (seqn > 127) {
          // Sequence number restarted at 128 (to separate node restarts
          // from sequence number overflow).
          seqn -= 128;
          seqnoDelta -= 128;
          s -= 128;
        } else {
          // Sequence number restarted at 0. This is usually an indication that
          // the node restarted.
          nodeRestartCount++;
        }
        if (seqn > 0) {
          lost += seqn;
        }
      } else if (s > maxSeqno + 1){
        lost += s - (maxSeqno + 1);
      }
      if (s < minSeqno) minSeqno = s;
      if (s > maxSeqno) maxSeqno = s;
      dataCount++;
    }
    data.setSeqno(s);
  }

  public void clear() {
    for (int i = 0, n = values.length; i < n; i++) {
      values[i] = 0L;
    }
    dataCount = 0;
    duplicates = 0;
    lost = 0;
    nodeRestartCount = 0;
    nextHopChangeCount = 0;
    lastNextHop = 0;
    minSeqno = Integer.MAX_VALUE;
    maxSeqno = Integer.MIN_VALUE;
    seqnoDelta = 0;
    shortestPeriod = Long.MAX_VALUE;
    longestPeriod = 0;
  }

  public String toString() {
    StringBuilder sb = new StringBuilder();
    for (int i = 0, n = values.length; i < n; i++) {
      if (i > 0) sb.append(' ');
      sb.append(values[i]);
    }
    return sb.toString();
  }

  public double getCPUPower() {
    return (values[TIME_CPU] * POWER_CPU) / (values[TIME_CPU] + values[TIME_LPM]);
  }

  public double getLPMPower() {
    return (values[TIME_LPM] * POWER_LPM) / (values[TIME_CPU] + values[TIME_LPM]);
  }

  public double getListenPower() {
    return (values[TIME_LISTEN] * POWER_LISTEN) / (values[TIME_CPU] + values[TIME_LPM]);
  }

  public double getTransmitPower() {
    return (values[TIME_TRANSMIT] * POWER_TRANSMIT) / (values[TIME_CPU] + values[TIME_LPM]);
  }

  public double getAveragePower() {
    return (values[TIME_CPU] * POWER_CPU + values[TIME_LPM] * POWER_LPM
    + values[TIME_LISTEN] * POWER_LISTEN + values[TIME_TRANSMIT] * POWER_TRANSMIT)
    / (values[TIME_CPU] + values[TIME_LPM]);
  }

  public double getAverageDutyCycle(int index) {
      return (double)(values[index]) / (double)(values[TIME_CPU] + values[TIME_LPM]);
  }

  public long getPowerMeasureTime() {
    return (1000L * (values[TIME_CPU] + values[TIME_LPM])) / TICKS_PER_SECOND;
  }

  public double getAverageTemperature() {
    return dataCount > 0 ? (-39.6 + 0.01 * (values[TEMPERATURE] / dataCount)) : 0.0;
  }

  public double getAverageRtmetric() {
    return getAverageValue(RTMETRIC);
  }

  public double getAverageRadioIntensity() {
    return getAverageValue(RSSI);
  }

  public double getAverageLatency() {
    return getAverageValue(LATENCY) / 4096.0;
  }

  public double getAverageHumidity() {
    double v = 0.0;
    if (dataCount > 0) {
      v = -4.0 + 405.0 * (values[HUMIDITY] / dataCount) / 10000.0;
    }
    return v > 100 ? 100 : v;
  }

  public double getAverageLight1() {
    return 10.0 * getAverageValue(LIGHT1) / 7.0;
  }

  public double getAverageLight2() {
    return 46.0 * getAverageValue(LIGHT2) / 10.0;
  }

  public double getAverageBestNeighborETX() {
    return getAverageValue(BEST_NEIGHBOR_ETX) / 8.0;
  }

  public int getPacketCount() {
    return node.getSensorDataCount();
  }

  public int getNextHopChangeCount() {
    return nextHopChangeCount;
  }

  public int getEstimatedRestarts() {
    return nodeRestartCount;
  }

  public int getEstimatedLostCount() {
    return lost;
  }

  public int getDuplicateCount() {
    return duplicates;
  }

  public int getMinSeqno() {
      return minSeqno;
  }

  public int getMaxSeqno() {
      return maxSeqno;
  }

  public long getAveragePeriod() {
    if (dataCount > 1) {
      long first = node.getSensorData(0).getNodeTime();
      long last = node.getSensorData(node.getSensorDataCount() - 1).getNodeTime();
      return (last - first) / dataCount;
    }
    return 0;
  }

  public long getShortestPeriod() {
    return shortestPeriod < Long.MAX_VALUE ? shortestPeriod : 0;
  }

  public long getLongestPeriod() {
    return longestPeriod;
  }

}