<?php
/**
 * GET /api/runtime-config
 * Liefert die aktuelle Plattform-Konfiguration für Module.
 *
 * Modul ruft das beim Start ab und nutzt die Werte (Heartbeat-Intervall,
 * Stuck-Schwellwert, Rate-Limits etc.) statt fixer Werte. Damit kann
 * eine Lehrperson mit Admin-Rolle im Admin-Board live justieren, ohne
 * Modul-Redeploy.
 */

declare(strict_types=1);
require_once __DIR__ . '/../bootstrap.php';

v2_validate_method('GET');
v2_auth_require('any');

$rows = v2_db_all("
    SELECT config_key, config_value, value_type
    FROM platform_config_v2
    WHERE group_name IN ('telemetry', 'auth', 'general')
");

$config = [];
foreach ($rows as $r) {
    $key = $r['config_key'];
    $val = $r['config_value'];
    switch ($r['value_type']) {
        case 'int':   $val = (int) $val; break;
        case 'float': $val = (float) $val; break;
        case 'bool':  $val = $val === '1' || $val === 'true'; break;
        case 'json':  $val = json_decode($val, true); break;
        // string bleibt string
    }
    $config[$key] = $val;
}

// Konsumenten-freundliche Aliases (camelCase) für Module
$response = [
    'heartbeat' => [
        'minIntervalS' => $config['heartbeat_interval_min_s'] ?? 10,
        'maxIntervalS' => $config['heartbeat_interval_max_s'] ?? 30,
    ],
    'stuck' => [
        'thresholdS' => $config['stuck_threshold_s'] ?? 90,
    ],
    'telemetry' => [
        'rateLimitPerS' => $config['telemetry_rate_limit_per_s'] ?? 1,
        'eventCapPerSession' => $config['telemetry_event_cap_per_session'] ?? 2000,
        'retentionDays' => $config['telemetry_retention_days'] ?? 30,
    ],
    'auth' => [
        'tokenTTLs' => $config['token_ttl_s'] ?? 3600,
        'refreshWindowS' => $config['token_refresh_window_s'] ?? 300,
    ],
    '_raw' => $config,   // alle Werte als Flat-Dict für Debug-Zwecke
];

v2_response_ok($response);