<?php
header('Content-Type: application/json');

// Función para obtener el uso de CPU
function getCpuUsage() {
    $load = sys_getloadavg();
    return round($load[0] * 100, 2) . '%';
}

// Función para obtener el uso de RAM
function getRamUsage() {
    $free = shell_exec('free -m');
    $free = (string)trim($free);
    $free_arr = explode("\n", $free);
    $mem = explode(" ", $free_arr[1]);
    $mem = array_filter($mem, function($value) { return $value !== ""; });
    $mem = array_values($mem);
    
    $total = $mem[1];
    $used = $mem[2];
    
    $usage = round(($used / $total) * 100, 2) . '%';
    return $usage;
}

// Función para obtener el uso de disco
function getDiskUsage() {
    $total = disk_total_space("/");
    $free  = disk_free_space("/");
    $used  = $total - $free;
    $usage = round(($used / $total) * 100, 2) . '%';
    return $usage;
}

$data = array(
    'cpuUsage' => getCpuUsage(),
    'ramUsage' => getRamUsage(),
    'diskUsage' => getDiskUsage()
);

echo json_encode($data);
?>