#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <getopt.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#include "d4.h"
//Returns -1 on error, 0 otherwise
int d4_load_config(d4_t* d4)
{
    int i;
    int fd;
    char *buf;
    buf=calloc(1,2*FILENAME_MAX);
    if (buf) {
        for (i=0; i < ND4PARAMS; i++) {
            snprintf(buf,2*FILENAME_MAX, "%s/%s",d4->confdir, d4params[i]);
            fd = open(buf,O_RDONLY);
            if (fd > 0) {
                //FIXME error handling
                read(fd, d4->conf[i], SZCONFVALUE);
            } else {
                d4->errno_copy = errno;
                if ( d4->err_idx < SZERRVALUE ) {
                    snprintf(d4->errors[d4->err_idx], SZERRVALUE,
                            "Failed to load %s", d4params[i]);
                    d4->err_idx++;
                }
            }
        }
    }
    return -1;
}

void usage(void)
{
    printf("d4 client help\n");
}

d4_t* d4_init(char* confdir)
{
    d4_t* out;
    int i;
    out = calloc(1,sizeof(d4_t));
    if (out) {
        strncpy(out->confdir, confdir, FILENAME_MAX);
    }

    for  (i=0; i< ND4PARAMS; i++) {
        bzero(out->conf[i],SZCONFVALUE);
    }
    // Do other inititalization stuff here
    return out;
}

int main (int argc, char* argv[])
{
    int opt;
    char* confdir;
    d4_t* d4;

    confdir=calloc(1,FILENAME_MAX);
    if (!confdir)
        return EXIT_FAILURE;

    while ((opt = getopt(argc, argv, "c:h")) != -1) {
        switch (opt) {
            case 'h':
                usage();
                return EXIT_SUCCESS;
            case 'c':
                strncpy(confdir, optarg, FILENAME_MAX);
                break;
            default:
                fprintf(stderr,"An invalid command line argument was specified\n");
        }
    }
    if (!confdir[0]){
        fprintf(stderr,"A config directory must be specified\n");
        return EXIT_FAILURE;
    }


    d4 = d4_init(confdir);
    free(confdir);
    d4_load_config(d4);
    return EXIT_SUCCESS;
}