/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include "mpitestconf.h"
#include <stdio.h>
#include "mpitest.h"

static char MTEST_Descrip[] = "Test MPI_PROD operations on optional datatypes dupported by MPICH2";

typedef struct { double r, i; } d_complex;

/*
 * This test looks at the handling of logical and for types that are not 
 * integers or are not required integers (e.g., long long).  MPICH2 allows
 * these as well.  A strict MPI test should not include this test.
 */
int main( int argc, char *argv[] )
{
    int errs = 0;
    int rank, size, maxsize, result[6] = { 1, 1, 2, 6, 24, 120 };
    MPI_Comm      comm;
    char cinbuf[3], coutbuf[3];
    unsigned char ucinbuf[3], ucoutbuf[3];
    d_complex dinbuf[3], doutbuf[3];

    MTest_Init( &argc, &argv );

    comm = MPI_COMM_WORLD;

    MPI_Comm_rank( comm, &rank );
    MPI_Comm_size( comm, &size );
    if (size > 5) maxsize = 5;
    else          maxsize = size;

    /* General forumula: If we multiple the values from 1 to n, the 
       product is n!.  This grows very fast, so we'll only use the first 
       five (1! = 1, 2! = 2, 3! = 6, 4! = 24, 5! = 120), with n!
       stored in the array result[n] */

    /* char */
    cinbuf[0] = (rank < maxsize && rank > 0) ? rank : 1;
    cinbuf[1] = 0;
    cinbuf[2] = (rank > 1);

    coutbuf[0] = 0;
    coutbuf[1] = 1;
    coutbuf[2] = 1;
    MPI_Reduce( cinbuf, coutbuf, 3, MPI_CHAR, MPI_PROD, 0, comm );
    if (rank == 0) {
	if (coutbuf[0] != (char)result[maxsize-1]) {
	    errs++;
	    fprintf( stderr, "char PROD(rank) test failed (%d!=%d)\n",
		     (int)coutbuf[0], (int)result[maxsize]);
	}
	if (coutbuf[1]) {
	    errs++;
	    fprintf( stderr, "char PROD(0) test failed\n" );
	}
	if (size > 1 && coutbuf[2]) {
	    errs++;
	    fprintf( stderr, "char PROD(>) test failed\n" );
	}
    }

    /* unsigned char */
    ucinbuf[0] = (rank < maxsize && rank > 0) ? rank : 1;
    ucinbuf[1] = 0;
    ucinbuf[2] = (rank > 0);

    ucoutbuf[0] = 0;
    ucoutbuf[1] = 1;
    ucoutbuf[2] = 1;
    MPI_Reduce( ucinbuf, ucoutbuf, 3, MPI_UNSIGNED_CHAR, MPI_PROD, 0, comm );
    if (rank == 0) {
	if (ucoutbuf[0] != (unsigned char)result[maxsize-1]) {
	    errs++;
	    fprintf( stderr, "unsigned char PROD(rank) test failed\n" );
	}
	if (ucoutbuf[1]) {
	    errs++;
	    fprintf( stderr, "unsigned char PROD(0) test failed\n" );
	}
	if (size > 1 && ucoutbuf[2]) {
	    errs++;
	    fprintf( stderr, "unsigned char PROD(>) test failed\n" );
	}
    }

    if (MPI_DOUBLE_COMPLEX != MPI_DATATYPE_NULL) {
	/* double complex; may be null if we do not have Fortran support */
	dinbuf[0].r = (rank < maxsize && rank > 0) ? rank : 1;
	dinbuf[1].r = 0;
	dinbuf[2].r = (rank > 0);
	dinbuf[0].i = 0;
	dinbuf[1].i = 1;
	dinbuf[2].i = -(rank > 0);
	
	doutbuf[0].r = 0;
	doutbuf[1].r = 1;
	doutbuf[2].r = 1;
	doutbuf[0].i = 0;
	doutbuf[1].i = 1;
	doutbuf[2].i = 1;
	MPI_Reduce( dinbuf, doutbuf, 3, MPI_DOUBLE_COMPLEX, MPI_PROD, 0, comm );
	if (rank == 0) {
	    double imag, real;
	    if (doutbuf[0].r != (double)result[maxsize-1] || doutbuf[0].i != 0) {
		errs++;
		fprintf( stderr, "double complex PROD(rank) test failed\n" );
	    }
	    /* Multiplying the imaginary part depends on size mod 4 */
	    imag = 1.0; real = 0.0; /* Make compiler happy */
	    switch (size % 4) {
	    case 1: imag = 1.0; real = 0.0; break;
	    case 2: imag = 0.0; real = -1.0; break;
	    case 3: imag =-1.0; real = 0.0; break;
	    case 0: imag = 0.0; real = 1.0; break; 
	    }
	    if (doutbuf[1].r != real || doutbuf[1].i != imag) {
		errs++;
		fprintf( stderr, "double complex PROD(i) test failed (%f,%f)!=(%f,%f)\n",
			 doutbuf[1].r,doutbuf[1].i,real,imag);
	    }
	    if (doutbuf[2].r != 0 || doutbuf[2].i != 0) {
		errs++;
		fprintf( stderr, "double complex PROD(>) test failed\n" );
	    }
	}
    }

#ifdef HAVE_LONG_DOUBLE
    { long double ldinbuf[3], ldoutbuf[3];
    /* long double */
    ldinbuf[0] = (rank < maxsize && rank > 0) ? rank : 1;
    ldinbuf[1] = 0;
    ldinbuf[2] = (rank > 0);

    ldoutbuf[0] = 0;
    ldoutbuf[1] = 1;
    ldoutbuf[2] = 1;
    if (MPI_LONG_DOUBLE != MPI_DATATYPE_NULL) {
	MPI_Reduce( ldinbuf, ldoutbuf, 3, MPI_LONG_DOUBLE, MPI_PROD, 0, comm );
	if (rank == 0) {
	    if (ldoutbuf[0] != (long double)result[maxsize-1]) {
		errs++;
		fprintf( stderr, "long double PROD(rank) test failed\n" );
	    }
	    if (ldoutbuf[1]) {
		errs++;
		fprintf( stderr, "long double PROD(0) test failed\n" );
	    }
	    if (size > 1 && ldoutbuf[2] != 0) {
		errs++;
		fprintf( stderr, "long double PROD(>) test failed\n" );
	    }
	}
    }
    }
#endif

#ifdef HAVE_LONG_LONG
    {
	long long llinbuf[3], lloutbuf[3];
    /* long long */
    llinbuf[0] = (rank < maxsize && rank > 0) ? rank : 1;
    llinbuf[1] = 0;
    llinbuf[2] = (rank > 0);

    lloutbuf[0] = 0;
    lloutbuf[1] = 1;
    lloutbuf[2] = 1;
    if (MPI_LONG_LONG != MPI_DATATYPE_NULL) {
	MPI_Reduce( llinbuf, lloutbuf, 3, MPI_LONG_LONG, MPI_PROD, 0, comm );
	if (rank == 0) {
	    if (lloutbuf[0] != (long long)result[maxsize-1]) {
		errs++;
		fprintf( stderr, "long long PROD(rank) test failed\n" );
	    }
	    if (lloutbuf[1]) {
		errs++;
		fprintf( stderr, "long long PROD(0) test failed\n" );
	    }
	    if (size > 1 && lloutbuf[2]) {
		errs++;
		fprintf( stderr, "long long PROD(>) test failed\n" );
	    }
	}
    }
    }
#endif

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
