<?php
/** admin2/api/config.php — Config table read/edit (all keys). */
require_once __DIR__ . '/../lib/helpers.php';
$pdo = db();

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $input = json_decode(file_get_contents('php://input'), true);
    $key = $input['key'] ?? '';
    $value = $input['value'] ?? '';
    if (!$key) json_response(['error' => 'Missing key']);
    try {
        $pdo->beginTransaction();
        $updated = $pdo->prepare("UPDATE config SET value = ?, updated_at = EXTRACT(EPOCH FROM NOW())::BIGINT WHERE key = ?")
            ->execute([$value, $key]);
        if (!$updated) {
            throw new RuntimeException("Failed to update $key");
        }

        // The caching daemon polls this generation value and reloads config
        // independently of whether the relay's main process is restarted.
        if (in_array($key, [
            'caching_backfill_enabled',
            'caching_inbox_enabled',
            'caching_live_enabled',
            'caching_live_strategy',
            'caching_live_kinds',
            'caching_live_since_seconds',
            'caching_live_limit',
            'caching_backfill_page_size',
            'caching_backfill_tick_interval_ms'
        ], true)) {
            $pdo->exec("UPDATE config SET value = (COALESCE(value::int, 0) + 1)::text, updated_at = EXTRACT(EPOCH FROM NOW())::BIGINT WHERE key = 'caching_config_generation'");
        }
        $pdo->commit();
        json_response(['message' => "Updated $key"]);
    } catch (Throwable $e) {
        if ($pdo->inTransaction()) $pdo->rollBack();
        json_response(['error' => $e->getMessage()], 500);
    }
}

$rows = $pdo->query("SELECT key, value FROM config ORDER BY key")->fetchAll();
json_response(['config' => $rows]);