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package com.intenthq.icicle.redis;

import java.util.List;
import java.util.Objects;

/**
 * The response from the Icicle ID generation script.
 *
 * It has four fields, all equally important to generate an ID:
 *
 *   * Where sequence generation starts from
 *   * Where sequence generation ends
 *   * The logical shard ID
 *   * The current time in seconds
 *   * The current time in microseconds
 *
 * Create an instance of this by passing the result you get back from executing the Lua script with your chosen Redis
 * library.
 */
public class IcicleRedisResponse {
  private static final int START_SEQUENCE_INDEX = 0;
  private static final int END_SEQUENCE_INDEX = 1;
  private static final int LOGICAL_SHARD_ID_INDEX = 2;
  private static final int TIME_SECONDS_INDEX = 3;
  private static final int TIME_MICROSECONDS_INDEX = 4;

  private final long startSequence;
  private final long endSequence;
  private final long logicalShardId;
  private final long timeSeconds;
  private final long timeMicroseconds;

  /**
   * Create an instance of the response from the ID generation Lua script.
   * @param results The list of long values returned by the Lua script. If this param is null, a NullPointerException
   *                will be thrown.
   */
  public IcicleRedisResponse(final List results) {
    this.startSequence = results.get(START_SEQUENCE_INDEX);
    this.endSequence = results.get(END_SEQUENCE_INDEX);
    this.logicalShardId = results.get(LOGICAL_SHARD_ID_INDEX);
    this.timeSeconds = results.get(TIME_SECONDS_INDEX);
    this.timeMicroseconds = results.get(TIME_MICROSECONDS_INDEX);
  }

  public long getStartSequence() {
    return startSequence;
  }

  public long getEndSequence() {
    return endSequence;
  }

  public long getLogicalShardId() {
    return logicalShardId;
  }

  public long getTimeSeconds() {
    return timeSeconds;
  }

  public long getTimeMicroseconds() {
    return timeMicroseconds;
  }

  public boolean equals(final Object o) {
    if (this == o) return true;
    if (o == null) return false;
    if (getClass() != o.getClass()) return false;

    IcicleRedisResponse response = (IcicleRedisResponse) o;
    return Objects.equals(startSequence, response.getStartSequence())
      && Objects.equals(endSequence, response.getEndSequence())
      && Objects.equals(logicalShardId, response.getLogicalShardId())
      && Objects.equals(timeSeconds, response.getTimeSeconds())
      && Objects.equals(timeMicroseconds, response.getTimeMicroseconds());
  }

  public int hashCode() {
    return Objects.hash(startSequence, endSequence, logicalShardId, timeSeconds, timeMicroseconds);
  }
}