#include "utils.h"

#include <stdio.h>
#include <stddef.h>
#include <string.h>

/*
 * Macros
 */
#define MAX_CLI_ARGS    (20)

/*
 * Type definitions
 */
typedef struct {
    const char *key;
    char *value;
} cli_arg_t;

/*
 * Data
 */
static cli_arg_t _cli_args[MAX_CLI_ARGS];

/*
 * Public API
 */
void print_usage_text() {
    printf("ipoim -M <mode> -A <address> -P <port> -C <carrier> ...\n");
    printf(" --- MANDATORY ARGUMENTS ---\n");
    printf("    -M <mode>           - operation mode ('provider' or 'last-mile')\n");
    printf("    -A <address>        - IPv4 to listen on/connect to\n");
    printf("    -P <port>           - port to listen on/connect to\n");
    printf("    -E <carrier>        - extension to use, one of:\n");
    printf("        * pipe          - use STDIN and STDOUT\n");
    printf(" --- OPTIONAL ARGUMENTS ---\n");
    printf("    +V                  - be verbose\n");
}

bool cli_arg_set(const char *key, char *value) {
    int index_to_use = -1;
    for (int i = 0; i < MAX_CLI_ARGS; ++i) {
        // empty entry
        if (_cli_args[i].key == NULL) {
            // update index only if no place is found yet
            if (index_to_use == -1)
                index_to_use = i;
        }
        // entry with the same name
        else if (!strcmp(_cli_args[i].key, key)) {
            index_to_use = i;
            break;
        }
    }
    // no space for the argument
    if (index_to_use == -1) {
        return false;
    }
    _cli_args[index_to_use].key = key;
    _cli_args[index_to_use].value = value;
    return true;
}

const char *cli_arg_get(const char *key) {
    for (int i = 0; i < MAX_CLI_ARGS; ++i) {
        if (_cli_args[i].key == NULL) {
            continue;
        }
        if (strcmp(_cli_args[i].key, key)) {
            continue;
        }
        return _cli_args[i].value;
    }
    return NULL;
}