/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- 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.

- Neither  the name  of Rice  University (RICE) 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 RICE and the contributors on an "as is"
basis, without any representations or warranties of any kind, express
or implied including, but not limited to, representations or
warranties of non-infringement, merchantability or fitness for a
particular purpose. In no event shall RICE 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.

********************************************************************************/
package rice.pastry.testing;

import rice.environment.random.RandomSource;
import rice.environment.random.simple.SimpleRandomSource;
import rice.pastry.*;
import java.util.*;

/**
 * IdRangeUnit tests the IdRange class.
 *
 * @version $Id: IdRangeUnit.java 2844 2005-12-15 13:07:05Z jeffh $
 * @author Peter Druschel
 */

public class IdRangeUnit {
  private RandomSource rng;

  /**
   * Constructor for IdRangeUnit.
   */
  public IdRangeUnit() {
    rng = new SimpleRandomSource(null);

    System.out.println("IdRangeUnit test starting...");

    for (int i = 0; i < 1000; i++) {
      IdRange r1 = createEmptyIdRange();
      IdRange r2 = createEmptyIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createFullIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createRandomIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      //
      r1 = createFullIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createFullIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createEmptyIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      //
      r1 = createRandomIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeStartingWith(r1.getCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeStartingWith(r1.getCCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeEndingIn(r1.getCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeEndingIn(r1.getCCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = r1.complement();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      //
      r1 = createFullIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeStartingWith(r1.getCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeStartingWith(r1.getCCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeEndingIn(r1.getCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeEndingIn(r1.getCCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      //
      r1 = createEmptyIdRange();

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeStartingWith(r1.getCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeStartingWith(r1.getCCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeEndingIn(r1.getCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r2 = createIdRangeEndingIn(r1.getCCW());

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);

      r1 = new IdRange(createIdWithPrefix((byte) 0xC0),
        createIdWithPrefix((byte) 0x40));
      r2 = new IdRange(createIdWithPrefix((byte) 0xE0),
        createIdWithPrefix((byte) 0x20));

      equalityTest(r1, r2);
      mergeIntersectTest(r1, r2);
      diffSubtractTest(r1, r2);
      mergeTest(r1, r2);
    }

    System.out.println("IdRangeUnit test finished.");

  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public IdRange createRandomIdRange() {
    IdRange r;
    r = new IdRange(Id.makeRandomId(rng), Id.makeRandomId(rng));
    return r;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public IdRange createFullIdRange() {
    IdRange r;
    Id id = Id.makeRandomId(rng);
    r = new IdRange(id, id);
    return r;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @return DESCRIBE THE RETURN VALUE
   */
  public IdRange createEmptyIdRange() {
    IdRange r;
    r = new IdRange();
    return r;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param ccw DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public IdRange createIdRangeStartingWith(Id ccw) {
    IdRange r;
    r = new IdRange(ccw, Id.makeRandomId(rng));
    return r;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param cw DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public IdRange createIdRangeEndingIn(Id cw) {
    IdRange r;
    r = new IdRange(Id.makeRandomId(rng), cw);
    return r;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param b DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   */
  public Id createIdWithPrefix(byte b) {
    byte[] data = new byte[Id.IdBitLength / 8];

    data[data.length - 1] = b;
    return Id.build(data);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param r1 DESCRIBE THE PARAMETER
   * @param r2 DESCRIBE THE PARAMETER
   */
  public void equalityTest(IdRange r1, IdRange r2) {

    if (r1.equals(r2) && !r1.isEmpty() && !r1.isFull()) {
      System.out.println("ALERT: equality failed with high probability" + r1
        + r2);
    }

    if (!r1.equals(r1)) {
      System.out.println("ALERT: equality is not reflexive." + r1);
    }

    IdRange r3 = new IdRange(r2.getCCW(), r2.getCW());
    IdRange r31 = new IdRange(r3);

    if ((!r3.equals(r2) && !r2.isEmpty()) || !r3.equals(r31)) {
      System.out.println("ALERT: equality failed." + r2 + r3 + r31);
    }

    //if (r2.hashCode() != r3.hashCode() && !r2.isEmpty())
    // System.out.println("ALERT: hashCode failed." + r2 + r3);

    IdRange r4 = new IdRange();
    IdRange r5 = new IdRange(r1.getCCW(), r1.getCCW());

    if (r4.equals(r5)) {
      System.out.println("ALERT: equality failed" + r4 + r4);
    }
    if (!r4.isEmpty() || r5.isEmpty()) {
      System.out.println("ALERT: isEmpty failed" + r4 + r5);
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param r1 DESCRIBE THE PARAMETER
   * @param r2 DESCRIBE THE PARAMETER
   */
  public void mergeIntersectTest(IdRange r1, IdRange r2) {

    IdRange m1 = r1.merge(r2);
    IdRange m2 = r2.merge(r1);
    IdRange i1 = r1.intersect(r2);

    if (!m1.equals(m2) && (!i1.isEmpty() || r1.isAdjacent(r2)) && !r1.isEmpty()) {
      System.out.println("ALERT: merge is not symmetric 1" + r1 + r2 + m1 + m2);
    }

    boolean intersect = !i1.isEmpty();
    boolean adjacent = r1.isAdjacent(r2);
    boolean intersectOrAdjacent = intersect || adjacent;

    IdRange i2 = r2.intersect(r1);

    if (i1.isEmpty() != i2.isEmpty()) {
      System.out.println("ALERT: intersect error 1." + i1 + i2);
    }

    if (intersectOrAdjacent) {

      if (m1.equals(r1) && !i1.isEmpty() && !i1.equals(r2)) {
        System.out.println("ALERT: merge is not symmetric 2" + r1 + r2 + m1
          + i1);
      }

      if (m1.equals(r2) && !i1.isEmpty() && !i1.equals(r1)) {
        System.out.println("ALERT: merge is not symmetric 3" + r1 + r2 + m1
          + i1);
      }

      IdRange re1 = m1.intersect(r1);
      IdRange re2 = m1.intersect(r2);

      if (!r1.equals(re1) || !r2.equals(re2)) {
        System.out.println("ALERT: intersect error 2." + r1 + re1 + r2 + re2
          + m1);
      }
    } else {
      if (!m1.equals(r1) && !r1.isEmpty()) {
        System.out.println("ALERT: merge error 0." + r1 + r2 + m1);
      }
    }

    if ((r1.isEmpty() || r2.isEmpty()) && !i1.isEmpty()) {
      System.out.println("ALERT: intersect error 3." + r1 + r2 + i1);
    }

    if (r1.isEmpty() && !m1.equals(r2)) {
      System.out.println("ALERT: merge error 1." + r1 + r2 + m1);
    }
    if (r2.isEmpty() && !m1.equals(r1)) {
      System.out.println("ALERT: merge error 2." + r1 + r2 + m1);
    }

    if ((r1.isFull() || r2.isFull()) && !m1.isFull()) {
      System.out.println("ALERT: merge error 3." + r1 + r2 + m1);
    }

    if (r1.isFull() && !i1.equals(r2)) {
      System.out.println("ALERT: intersect error 4." + r1 + r2 + i1);
    }
    if (r2.isFull() && !i1.equals(r1)) {
      System.out.println("ALERT: intersect error 5." + r1 + r2 + m1);
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param r1 DESCRIBE THE PARAMETER
   * @param r2 DESCRIBE THE PARAMETER
   */
  public void diffSubtractTest(IdRange r1, IdRange r2) {

    IdRange d1 = r1.diff(r2);
    IdRange d2 = r2.diff(r1);

    IdRange i1 = r1.intersect(r2);
    IdRange i2 = r2.intersect(r1);

    if (!d1.intersect(i1).isEmpty() || !d1.intersect(i2).isEmpty()
      || !d2.intersect(i1).isEmpty() || !d2.intersect(i2).isEmpty()) {
      System.out.println("ALERT: diff error 1." + r1 + r2 + d1 + d2 + i1 + i2);
    }

    if (!i1.equals(i2)) {
      if (d1.equals(d2)) {
        System.out.println("ALERT: diff error 15." + r1 + r2 + d1 + d2 + i1
          + i2);
      }
    }

    // try to reconstitute
    IdRange re1 = d1;
    IdRange re2 = d2;
    for (int i = 0; i < 3; i++) {
      re1 = re1.merge(d1);
      re1 = re1.merge(i1);
      re1 = re1.merge(d2);
      re1 = re1.merge(i2);
      re2 = re2.merge(d1);
      re2 = re2.merge(i1);
      re2 = re2.merge(d2);
      re2 = re2.merge(i2);
    }
    IdRange r12 = r1.merge(r2);

    if ((!re1.equals(r1) && !re1.equals(r2) && !re1.equals(r12))
      || (!re2.equals(r1) && !re2.equals(r2) && !re2.equals(r12))) {
      System.out.println("ALERT: diff error 2." + r1 + r2 + d1 + d2 + i1 + i2
        + re1 + re2);
    }

    d1 = r1.subtract(r2, false);
    d2 = r1.subtract(r2, true);

    if (!d1.intersect(i1).isEmpty() || !d1.intersect(i2).isEmpty()
      || !d2.intersect(i1).isEmpty() || !d2.intersect(i2).isEmpty()) {
      System.out.println("ALERT: subtract error 1." + r1 + r2 + d1 + d2 + i1
        + i2);
    }

    if ((!d1.isEmpty() && d1.intersect(r1).isEmpty())
      || (!d2.isEmpty() && d2.intersect(r1).isEmpty())) {
      System.out.println("ALERT: subtract error 2." + r1 + r2 + d1 + d2);
    }

    // try to reconstitute
    re1 = d1;
    re2 = d2;
    for (int i = 0; i < 3; i++) {
      re1 = re1.merge(d1);
      re1 = re1.merge(i1);
      re1 = re1.merge(d2);
      re1 = re1.merge(i2);
      re2 = re2.merge(d1);
      re2 = re2.merge(i1);
      re2 = re2.merge(d2);
      re2 = re2.merge(i2);
    }
    r12 = r1.merge(r2);

    if (!re1.equals(r1) && !re2.equals(r1)) {
      System.out.println("ALERT: subtract error 25." + r1 + r2 + d1 + d2 + i1
        + i2 + re1 + re2);
    }

    d1 = r2.subtract(r1, false);
    d2 = r2.subtract(r1, true);

    if (!d1.intersect(i1).isEmpty() || !d1.intersect(i2).isEmpty()
      || !d2.intersect(i1).isEmpty() || !d2.intersect(i2).isEmpty()) {
      System.out.println("ALERT: subtract error 3." + r1 + r2 + d1 + d2 + i1
        + i2);
    }

    if ((!d1.isEmpty() && d1.intersect(r2).isEmpty())
      || (!d2.isEmpty() && d2.intersect(r2).isEmpty())) {
      System.out.println("ALERT: subtract error 4." + r1 + r2 + d1 + d2);
    }

    // try to reconstitute
    re1 = d1;
    re2 = d2;
    for (int i = 0; i < 3; i++) {
      re1 = re1.merge(d1);
      re1 = re1.merge(i1);
      re1 = re1.merge(d2);
      re1 = re1.merge(i2);
      re2 = re2.merge(d1);
      re2 = re2.merge(i1);
      re2 = re2.merge(d2);
      re2 = re2.merge(i2);
    }
    r12 = r1.merge(r2);

    if (!re1.equals(r2) && !re2.equals(r2)) {
      System.out.println("ALERT: subtract error 5." + r1 + r2 + d1 + d2 + i1
        + i2 + re1 + re2);
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param r1 DESCRIBE THE PARAMETER
   * @param r2 DESCRIBE THE PARAMETER
   */
  public void mergeTest(IdRange r1, IdRange r2) {

    IdRange ccw = r1.ccwHalf();
    IdRange cw = r1.cwHalf();

    if (!ccw.intersect(cw).isEmpty()) {
      System.out.println("ALERT: ccw and cw halves intersect." + r1 + ccw + cw);
    }
    if (!r1.equals(ccw.merge(cw))) {
      System.out.println("ALERT: merge cw/ccw failure." + r1 + ccw + cw);
    }

    ccw = r2.ccwHalf();
    cw = r2.cwHalf();

    if (!ccw.intersect(cw).isEmpty()) {
      System.out.println("ALERT: ccw and cw halves intersect." + r2 + ccw + cw);
    }
    if (!r2.equals(ccw.merge(cw))) {
      System.out.println("ALERT: merge cw/ccw failure." + r2 + ccw + cw);
    }
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param args DESCRIBE THE PARAMETER
   */
  public static void main(String args[]) {
    IdRangeUnit niu = new IdRangeUnit();
  }
}

