#include <stdio.h>
#include "cmdline.h"

void parse_arguments(int argc, char *argv[], 
        int *nx, int *maxsteps, float *threshold, 
        int *num_work_items, int *workgroup_size_factor,
        FILE **outfile, cl_device_type *device_type)
{
    char *usage_msg = 
    "usage is"
    "\n %s points max_iterations convergence_threshold"
    "\n  num_work_items workgroup_size_factor [\"CPU\"]"
    "\n  [outfilename]"
    "\n";

    *nx = get_integer_arg(argc, argv, 1, 1, 
            "points", usage_msg);
    *maxsteps = get_integer_arg(argc, argv, 2, 1, 
            "max_iterations", usage_msg);
    *threshold = get_floating_arg(argc, argv, 3, 0.0, 
            "convergence_threshold", usage_msg);
    *num_work_items = get_integer_arg(argc, argv, 4, 1, 
            "num_work_items", usage_msg);
    *workgroup_size_factor = get_integer_arg(argc, argv, 5, 1, 
            "workgroup_size_factor", usage_msg);
    *outfile = NULL;
    *device_type = CL_DEVICE_TYPE_GPU;
    int next_parm = 6;
    if (argc > next_parm) {
        if (strcmp(argv[next_parm], "CPU") == 0) {
            *device_type = CL_DEVICE_TYPE_CPU;
            next_parm += 1;
        }
    }
    if (argc > next_parm) {
        FILE* out = fopen(argv[next_parm], "w");
        if (out == NULL) {
            fprintf(stderr, "Cannot open outfile %s\n", argv[next_parm]);
            fprintf(stderr, usage_msg, argv[0]);
            exit(EXIT_FAILURE);
        }
        *outfile = out;
    }
}

void initialize_values(float uk[], int nx) {
    uk[0] = LEFTVAL; uk[nx+1] = RIGHTVAL;
    for (int i = 1; i <= nx; ++i)
        uk[i] = 0.0f;
}