/*
 *  Copyright (C) 2019, Northwestern University and Argonne National Laboratory
 *  See COPYRIGHT notice in top-level directory.
 */

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 * This program verify variable read capability with imap of adios driver
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#include <stdio.h>
#include <stdlib.h> /* setenv() */
#include <libgen.h> /* basename() */
#include <mpi.h>
#include "pnetcdf.h"
#include <math.h>

#include <testutils.h>

/* This is the name of the data file we will read. */
#define FILE_NAME "arrays.bp"
#define V1_NAME "var_double_2Darray"
#define V2_NAME "var_int_1Darray"
#define D1_NAME "NX"
#define D2_NAME "NY"

/* We are reading 2D data, a 6 x 12 grid. */
#define NX 10ULL
#define NY 100ULL
#define NDIMS 2

/* Handle errors by printing an error message and exiting with a
 * non-zero status. */
#define ERRCODE 2
#define ERR(e) {printf("Error: %s\n", nc_strerror(e)); exit(ERRCODE);}

double data[NX][NY], datat[NY][NX];

int main(int argc, char** argv) {
    char filename[256];
    int i, j, nerrs=0, rank, nprocs, err;
    int ncid;
    MPI_Offset start[2], count[2], imap[2];

    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

    if (argc > 2) {
        if (!rank) printf("Usage: %s [filename]\n",argv[0]);
        nerrs++;
        goto fn_exit;
    }
    if (argc == 2) snprintf(filename, 256, "%s", argv[1]);
    else           strcpy(filename, FILE_NAME);

    if (rank == 0) {
        char *cmd_str = (char*)malloc(strlen(argv[0]) + 256);
        sprintf(cmd_str,
        "*** TESTING C   %s for adios independent variable read",
        basename(argv[0]));
        printf("%-66s ------ ", cmd_str); fflush(stdout);
        free(cmd_str);
    }

    err = ncmpi_open(MPI_COMM_WORLD, filename, NC_NOWRITE, MPI_INFO_NULL, &ncid);
    CHECK_ERR

    err = ncmpi_begin_indep_data(ncid);
    CHECK_ERR

    if (rank == 0){
        start[0] = 0;
        start[1] = 0;
        count[0] = NX;
        count[1] = NY;
        err = ncmpi_get_vara_double(ncid, 0, start, count, (double*)data);
        CHECK_ERR

        imap[0] = 1;
        imap[1] = NX;
        err = ncmpi_get_varm_double(ncid, 0, start, count, NULL, imap,
                                    (double*)datat); CHECK_ERR

        for(i = 0; i < NX; i++){
            for(j = 0; j < NY; j++){
                if (fabs(data[i][j] - datat[j][i]) > 0.0001){
                    printf("Rank %d: Expect Var 0 [%d][%d] = %lf != Var 0 T [%d][%d] = %lf\n",
                            rank, i, j, data[i][j], j, i, data[j][i]);
                    nerrs++;
                }
            }
        }
    }

    ncmpi_close(ncid);

fn_exit:
    MPI_Allreduce(MPI_IN_PLACE, &nerrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
    if (rank == 0) {
        if (nerrs) printf(FAIL_STR,nerrs);
        else       printf(PASS_STR);
    }

    MPI_Finalize();
    return (nerrs > 0);
}

