/* retoor <retoor@molodetz.nl> */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/utsname.h>
#include "system.h"

int system_info_init(SystemInfo *info) {
    if (!info) return -1;
    memset(info, 0, sizeof(SystemInfo));
    return system_info_update(info);
}

int system_info_update(SystemInfo *info) {
    if (!info) return -1;

    struct utsname uts;
    if (uname(&uts) == 0) {
        strncpy(info->hostname, uts.nodename, MAX_HOSTNAME_LEN - 1);
        info->hostname[MAX_HOSTNAME_LEN - 1] = '\0';
        strncpy(info->kernel, uts.release, MAX_KERNEL_LEN - 1);
        info->kernel[MAX_KERNEL_LEN - 1] = '\0';
        strncpy(info->arch, uts.machine, MAX_ARCH_LEN - 1);
        info->arch[MAX_ARCH_LEN - 1] = '\0';
    }

    FILE *fp = fopen("/etc/os-release", "r");
    if (fp) {
        char line[512];
        while (fgets(line, sizeof(line), fp)) {
            if (strncmp(line, "PRETTY_NAME=", 12) == 0) {
                char *start = strchr(line, '"');
                if (start) {
                    start++;
                    char *end = strchr(start, '"');
                    if (end) {
                        *end = '\0';
                        strncpy(info->os_name, start, MAX_OS_LEN - 1);
                        info->os_name[MAX_OS_LEN - 1] = '\0';
                    }
                }
                break;
            }
        }
        fclose(fp);
    }

    fp = fopen("/proc/uptime", "r");
    if (fp) {
        double uptime;
        if (fscanf(fp, "%lf", &uptime) == 1) {
            info->uptime_seconds = (long)uptime;
            info->uptime_days = info->uptime_seconds / 86400;
            info->uptime_hours = (info->uptime_seconds % 86400) / 3600;
            info->uptime_minutes = (info->uptime_seconds % 3600) / 60;
        }
        fclose(fp);
    }

    fp = fopen("/proc/loadavg", "r");
    if (fp) {
        if (fscanf(fp, "%lf %lf %lf", &info->load_1, &info->load_5, &info->load_15) != 3) {
            info->load_1 = info->load_5 = info->load_15 = 0.0;
        }
        fclose(fp);
    }

    return 0;
}