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//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.3.0.0.1
//
// Copyright © 2008-2010 DiceLock Security, LLC. All rights reserved.
//
//                               DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED 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
// REGENTS 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
// 
// DICELOCK IS A REGISTERED TRADEMARK OR TRADEMARK OF THE OWNERS
// 
 
#include <stdexcept>
#include <stdlib.h>
#include <math.h>
#include "cumulativeSumForwardTest.h"
 
 
using namespace std;
 
 
namespace DiceLockSecurity {
  
  namespace RandomTest {
 
  // Random Test Class enumerator name
  const RandomTests CumulativeSumForwardTest::test = CumulativeSumForward;
  // Random Test Class minimum stream length
  const unsigned int  CumulativeSumForwardTest::minimumLength = 100;
 
  // Constructor, default 
  CumulativeSumForwardTest::CumulativeSumForwardTest() {
 
    cuSum = 0;
  }
 
 
  // Constructor with a MathematicalFunctions object instantiated 
  CumulativeSumForwardTest::CumulativeSumForwardTest(MathematicalFunctions* mathFuncObj) {
 
    cuSum = 0;
  }
 
  // Destructor
  CumulativeSumForwardTest::~CumulativeSumForwardTest() {
 
    cuSum = 0;
  }
 
  // Tests randomness of the BaseCryptoRandomStream and returns the random value
  bool CumulativeSumForwardTest::IsRandom(BaseCryptoRandomStream* bitStream) {
    int    i, k, start, finish;
    double z, sum, sum1, sum2;
 
    if (bitStream->GetBitLength() < this->GetMinimumLength()) {
      this->error = InsufficientNumberOfBits;
      this->random = false;
      return this->random;
    }
    bitStream->SetBitPosition(0);
    this->error = NoError;
    sum = 0.0;
    this->cuSum = 1;
    for(i = 0; i < (long)bitStream->GetBitLength(); i++) {
      sum += 2*(int)bitStream->GetBitForward() - 1;
        this->cuSum = MAX(this->cuSum, fabs(sum));
    }
    z = this->cuSum;
    sum1 = 0.0;
    start = (-(long)bitStream->GetBitLength()/(int)z+1)/4;
    finish = (bitStream->GetBitLength()/(int)z-1)/4;
    for(k = start; k <= finish; k++)
      sum1 += (this->mathFuncs->Normal((4*k+1)*z/sqrt((double)bitStream->GetBitLength()))-this->mathFuncs->Normal((4*k-1)*z/sqrt((double)bitStream->GetBitLength())));
    sum2 = 0.0;
    start = (-(long)bitStream->GetBitLength()/(int)z-3)/4;
    finish = (bitStream->GetBitLength()/(int)z-1)/4;
    for(k = start; k <= finish; k++)
      sum2 += (this->mathFuncs->Normal((4*k+3)*z/sqrt((double)bitStream->GetBitLength()))-this->mathFuncs->Normal((4*k+1)*z/sqrt((double)bitStream->GetBitLength())));
    this->pValue = 1.0 - sum1 + sum2;
    if (isNegative(this->pValue) || isGreaterThanOne(this->pValue)) {
      this->error = PValueOutOfRange;
        this->random = false; 
    }
    else {
      if (this->pValue < this->alpha) { 
            this->random = false; 
      }
      else {
        this->random = true; 
      }
    }
    return this->random;
  }
 
  // Initializes the object
  void CumulativeSumForwardTest::Initialize(void) {
 
    BaseRandomTest::Initialize();
    cuSum = 0;
  }
 
  // Gets the type of the object
  RandomTests CumulativeSumForwardTest::GetType(void) {
 
    return this->test;
  }
 
  // Gets the minimum random stream length
  unsigned int CumulativeSumForwardTest::GetMinimumLength(void) {
 
    return this->minimumLength;
  }
 
  // Gets the maximum partial sum
  double CumulativeSumForwardTest::GetCuSum(void) {
 
    return this->cuSum;
  }
  }
}