#include <cjson/cJSON.h>
#include <fcntl.h>
#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main() {
    MYSQL *conn;
    MYSQL_RES *res;
    MYSQL_ROW row;

    conn = mysql_init(NULL);
    if (conn == NULL) {
        fprintf(stderr, "mysql_init() failed\n");
        exit(1);
    }

    if (mysql_real_connect(conn, "localhost", "root", "root", "router", 3306,
                           NULL, 0) == NULL) {
        fprintf(stderr, "mysql_real_connect() failed\n");
        mysql_close(conn);
        exit(1);
    }

    if (mysql_query(conn, "SELECT * FROM ip_mac")) {
        fprintf(stderr, "SELECT query failed. Error: %s\n", mysql_error(conn));
        mysql_close(conn);
        exit(1);
    }

    res = mysql_store_result(conn);
    if (res == NULL) {
        fprintf(stderr, "mysql_store_result() failed\n");
        mysql_close(conn);
        exit(1);
    }

    cJSON *result_array = cJSON_CreateArray();

    while ((row = mysql_fetch_row(res))) {
        cJSON *item = cJSON_CreateObject();
        cJSON_AddStringToObject(item, "id", row[0]);
        cJSON_AddStringToObject(item, "ip", row[1]);
        cJSON_AddStringToObject(item, "mac", row[2]);
        cJSON_AddItemToArray(result_array, item);
    }

    char *result_json_string = cJSON_Print(result_array);

    printf("Content-Type: application/json;charset=utf-8\r\n");
    printf("\r\n");
    printf("%s", result_json_string);

    free(result_json_string);
    cJSON_Delete(result_array);
    mysql_free_result(res);
    mysql_close(conn);

    return 0;
}