// /home/romkazvo/www/cgi-bin/src/status.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>

long get_nginx_memory() {
    long total_kb = 0;
    char command[] = "ps -o rss= -C nginx 2>/dev/null";
    
    FILE *ps = popen(command, "r");
    if (!ps) return 0;
    
    char line[64];
    while (fgets(line, sizeof(line), ps)) {
        long kb;
        if (sscanf(line, "%ld", &kb) == 1) {
            total_kb += kb;
        }
    }
    pclose(ps);
    
    return total_kb;
}

int get_process_memory(const char *process_name, long *memory_kb) {
    char command[256];
    snprintf(command, sizeof(command), "ps -o rss= -C %s 2>/dev/null | head -1", process_name);
    
    FILE *ps = popen(command, "r");
    if (!ps) return 0;
    
    int result = fscanf(ps, "%ld", memory_kb);
    pclose(ps);
    
    return result == 1;
}

float get_cpu_load() {
    FILE *fp = fopen("/proc/loadavg", "r");
    if (!fp) return 0.0f;
    
    float load;
    fscanf(fp, "%f", &load);
    fclose(fp);
    
    return load;
}

void get_memory_usage(long *used_mb, long *total_mb) {
    FILE *fp = fopen("/proc/meminfo", "r");
    if (!fp) {
        *used_mb = 0;
        *total_mb = 0;
        return;
    }
    
    char line[128];
    long total = 0, available = 0;
    
    while (fgets(line, sizeof(line), fp)) {
        if (sscanf(line, "MemTotal: %ld kB", &total) == 1) {
            // сохраняем
        } else if (sscanf(line, "MemAvailable: %ld kB", &available) == 1) {
            break;
        }
    }
    fclose(fp);
    
    *total_mb = total / 1024;
    *used_mb = (total - available) / 1024;
}

int main() {
    printf("Content-type: text/plain; charset=utf-8\n\n");
    
    long busybox_kb = 0, nginx_kb = 0;
    get_process_memory("busybox", &busybox_kb);
    nginx_kb = get_nginx_memory();
    
    double busybox_mb = busybox_kb / 1024.0;
    double nginx_mb = nginx_kb / 1024.0;
    double total_mb = busybox_mb + nginx_mb;
    
    float cpu_load = get_cpu_load();
    
    long used_mb = 0, total_sys_mb = 0;
    get_memory_usage(&used_mb, &total_sys_mb);
    
    // Две строки
    printf("BusyBox: %.1f MB | Nginx: %.1f MB | Всего: %.1f MB\n", 
           busybox_mb, nginx_mb, total_mb);
    printf("CPU Load: %.2f | Память: %ld / %ld MB (%.0f%%)",
           cpu_load, used_mb, total_sys_mb, total_sys_mb > 0 ? (float)used_mb / total_sys_mb * 100 : 0);
    
    return 0;
}