/* Copyright (c) 2012, NVIDIA CORPORATION. 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 NVIDIA CORPORATION 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 THE COPYRIGHT HOLDERS AS IS'' AND ANY
 * EXPRESS 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 COPYRIGHT OWNER 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.
 */

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <omp.h>
#include "laplace2d.h"

int main(int argc, char** argv)
{

    int n, m, iter_max;

    if(argc > 1){
        n = atoi(argv[1]);
    } else {
        n = 4096;
    }

    if(argc > 2){
        m = atoi(argv[2]);
    } else {
        m = 4096;
    }

    if(argc > 3){
        iter_max = atoi(argv[3]);
    } else {
        iter_max = 1000;
    }

    const double tol = 1.0e-6;
    double error = 1.0;

    double *restrict A    = (double*)malloc(sizeof(double)*n*m);
    double *restrict Anew = (double*)malloc(sizeof(double)*n*m);
    
    initialize(A, Anew, m, n);
        
    printf("Jacobi relaxation Calculation: %d x %d mesh\n", n, m);
    
    double st = omp_get_wtime();
    int iter = 0;
   
    #pragma acc data copyin( A[:m*n],Anew[:m*n] )
    {
        while ( error > tol && iter < iter_max )
        {
            error = calcNext(A, Anew, m, n);
            swap(A, Anew, m, n);
        
            if(iter % 100 == 0)
            {
                printf("%5d, %0.6f\n", iter, error);
                for( int j = 0; j < m; j++ )
                {
                    for( int i = 0; i < n; i++ )
                    {
                        printf("%0.2f ", A[i+j*m]);
                    }
                    printf("\n");
                }
            }
        
            iter++;

        }
    }

    double runtime = omp_get_wtime() - st;
 
    printf(" total: %f s\n", runtime);

    deallocate(A, Anew);

    return 0;
}