<?php
// Mesure de latence des endpoints lourds de l'API ProserveAPI.
// A lancer AVANT et APRES chaque palier d'optimisation pour avoir des chiffres comparatifs.
// Usage : POST sur ce fichier avec optionnellement userId et sessionId.
//   curl -X POST -d "userId=1&sessionId=42" http://localhost/proserve/debug/benchmark.php
//   ou ouvrir directement dans le navigateur (lance avec userId=-1 et sessionId=-1, certains endpoints retourneront vide mais la mesure du round-trip reste valide).

include_once '../config/init.php';

$userId    = isset($_POST['userId'])    ? intval($_POST['userId'])    : (isset($_GET['userId'])    ? intval($_GET['userId'])    : -1);
$sessionId = isset($_POST['sessionId']) ? intval($_POST['sessionId']) : (isset($_GET['sessionId']) ? intval($_GET['sessionId']) : -1);
$iterations = isset($_POST['iterations']) ? max(1, intval($_POST['iterations'])) : (isset($_GET['iterations']) ? max(1, intval($_GET['iterations'])) : 5);

// si pas de sessionId fourni, prendre la plus recente pour avoir des donnees realistes
if ($sessionId <= 0) {
    $stmt = $db->query("SELECT id FROM sessions ORDER BY id DESC LIMIT 1");
    $row = $stmt ? $stmt->fetch(PDO::FETCH_ASSOC) : null;
    if ($row) $sessionId = intval($row['id']);
}
if ($userId <= 0) {
    $stmt = $db->query("SELECT userId FROM participates WHERE sessionId=" . intval($sessionId) . " LIMIT 1");
    $row = $stmt ? $stmt->fetch(PDO::FETCH_ASSOC) : null;
    if ($row) $userId = intval($row['userId']);
}

// resolution de l'URL de base (meme host et meme path)
$scheme = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
$host   = $_SERVER['HTTP_HOST'] ?? 'localhost';
$base   = $scheme . '://' . $host . rtrim(dirname(dirname($_SERVER['SCRIPT_NAME'])), '/\\');

$endpoints = [
    'session/debrief'         => ['sessionId' => $sessionId, 'userId' => $userId],
    'session/get'             => ['sessionId' => $sessionId],
    'stats/userhistory'       => ['userId' => $userId, 'sessionId' => $sessionId, 'quickMode' => 'false'],
    'stats/get'               => ['userId' => $userId, 'sessionId' => $sessionId],
    'lists/sessions_for_user' => ['userId' => $userId],
    'lists/users_in_session'  => ['sessionId' => $sessionId],
];

function call_endpoint($url, $params)
{
    // ext-curl est dispo dans XAMPP par defaut et bcp plus rapide que
    // file_get_contents+stream_context_create sur Windows (qui ajoute ~10ms par appel).
    static $ch = null;
    if ($ch === null) {
        $ch = curl_init();
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST           => true,
            CURLOPT_TIMEOUT        => 60,
            CURLOPT_FORBID_REUSE   => false,
            CURLOPT_FRESH_CONNECT  => false,
        ]);
    }
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));

    $start = microtime(true);
    $resp  = curl_exec($ch);
    $elapsed_ms = (microtime(true) - $start) * 1000;
    $err = curl_errno($ch);

    return [
        'ms'    => round($elapsed_ms, 2),
        'bytes' => $resp === false ? 0 : strlen($resp),
        'ok'    => $err === 0 && $resp !== false,
    ];
}

function summarize($samples)
{
    $times = array_column($samples, 'ms');
    sort($times);
    $n = count($times);
    return [
        'min'    => $times[0],
        'max'    => $times[$n - 1],
        'median' => $times[intval($n / 2)],
        'avg'    => round(array_sum($times) / $n, 2),
        'bytes'  => $samples[0]['bytes'],
        'ok'     => count(array_filter(array_column($samples, 'ok'))) === $n,
    ];
}

$results = [
    'context' => [
        'userId'     => $userId,
        'sessionId'  => $sessionId,
        'iterations' => $iterations,
        'base_url'   => $base,
        'timestamp'  => date('c'),
    ],
    'endpoints' => [],
];

foreach ($endpoints as $path => $params) {
    $url = $base . '/' . $path . '.php';
    $samples = [];
    for ($i = 0; $i < $iterations; $i++) {
        $samples[] = call_endpoint($url, $params);
    }
    $results['endpoints'][$path] = summarize($samples);
}

print_r(json_encode($results, JSON_PRETTY_PRINT));
?>