/*
* Portions Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: 
* The original NIST Statistical Test Suite code is placed in public domain.
* (http://csrc.nist.gov/groups/ST/toolkit/rng/documentation_software.html) 
* 
* This software was developed at the National Institute of Standards and Technology by 
* employees of the Federal Government in the course of their official duties. Pursuant
* to title 17 Section 105 of the United States Code this software is not subject to 
* copyright protection and is in the public domain. The NIST Statistical Test Suite is
* an experimental system. NIST assumes no responsibility whatsoever for its use by other 
* parties, and makes no guarantees, expressed or implied, about its quality, reliability, 
* or any other characteristic. We would appreciate acknowledgment if the software is used.
*/

#include "openc.h"
#include "../include/externs.h"
#include "../include/cephes.h"  

double psi2(int m, int n);

void
Serial(int m, int n)
{
	double	p_value1, p_value2, psim0, psim1, psim2, del1, del2;
	
	psim0 = psi2(m, n);
	psim1 = psi2(m-1, n);
	psim2 = psi2(m-2, n);
	del1 = psim0 - psim1;
	del2 = psim0 - 2.0*psim1 + psim2;
	p_value1 = cephes_igamc(pow(2, m-1)/2, del1/2.0);
	p_value2 = cephes_igamc(pow(2, m-2)/2, del2/2.0);
	
	fprintf(stats[TEST_SERIAL], "\t\t\t       SERIAL TEST\n");
	fprintf(stats[TEST_SERIAL], "\t\t---------------------------------------------\n");
	fprintf(stats[TEST_SERIAL], "\t\t COMPUTATIONAL INFORMATION:		  \n");
	fprintf(stats[TEST_SERIAL], "\t\t---------------------------------------------\n");
	fprintf(stats[TEST_SERIAL], "\t\t(a) Block length    (m) = %d\n", m);
	fprintf(stats[TEST_SERIAL], "\t\t(b) Sequence length (n) = %d\n", n);
	fprintf(stats[TEST_SERIAL], "\t\t(c) Psi_m               = %f\n", psim0);
	fprintf(stats[TEST_SERIAL], "\t\t(d) Psi_m-1             = %f\n", psim1);
	fprintf(stats[TEST_SERIAL], "\t\t(e) Psi_m-2             = %f\n", psim2);
	fprintf(stats[TEST_SERIAL], "\t\t(f) Del_1               = %f\n", del1);
	fprintf(stats[TEST_SERIAL], "\t\t(g) Del_2               = %f\n", del2);
	fprintf(stats[TEST_SERIAL], "\t\t---------------------------------------------\n");

	fprintf(stats[TEST_SERIAL], "%s\t\tp_value1 = %f\n", p_value1 < ALPHA ? "FAILURE" : "SUCCESS", p_value1);
	fprintf(results[TEST_SERIAL], "%f\n", p_value1);

	fprintf(stats[TEST_SERIAL], "%s\t\tp_value2 = %f\n\n", p_value2 < ALPHA ? "FAILURE" : "SUCCESS", p_value2);
	fprintf(results[TEST_SERIAL], "%f\n", p_value2);
}

double
psi2(int m, int n)
{
	int				i, j, k, powLen;
	double			sum, numOfBlocks;
	unsigned int	*P;
	
	if ( (m == 0) || (m == -1) )
		return 0.0;
	numOfBlocks = n;
	powLen = (int)pow(2, m+1)-1;
	if ( (P = (unsigned int*)calloc(powLen,sizeof(unsigned int)))== NULL ) {
		fprintf(stats[TEST_SERIAL], "Serial Test:  Insufficient memory available.\n");
		fflush(stats[TEST_SERIAL]);
		return 0.0;
	}
	for ( i=1; i<powLen-1; i++ )
		P[i] = 0;	  /* INITIALIZE NODES */
	for ( i=0; i<numOfBlocks; i++ ) {		 /* COMPUTE FREQUENCY */
		k = 1;
		for ( j=0; j<m; j++ ) {
			if ( epsilon[(i+j)%n] == 0 )
				k *= 2;
			else if ( epsilon[(i+j)%n] == 1 )
				k = 2*k+1;
		}
		P[k-1]++;
	}
	sum = 0.0;
	for ( i=(int)pow(2, m)-1; i<(int)pow(2, m+1)-1; i++ )
		sum += pow(P[i], 2);
	sum = (sum * pow(2, m)/(double)n) - (double)n;
	free(P);
	
	return sum;
}