<?php
/**
 * Site Pixel Tracking Endpoint
 * Replaces: sitepixel.cfm
 *
 * Tracks general site visits. Queues events for batch insert by cron.
 * Deduplication is handled at the cron level (simpler than replicating
 * the ColdFusion application-scope tracker in PHP).
 */

require_once __DIR__ . '/config.php';
require_once __DIR__ . '/PixelResponse.php';
require_once __DIR__ . '/BotFilter.php';
require_once __DIR__ . '/EventBuffer.php';
require_once __DIR__ . '/CookieManager.php';

// --- Region cookie (MUST happen before GIF flush) ---
$regid = filter_input(INPUT_GET, 'regid', FILTER_VALIDATE_INT);
if ($regid) {
    CookieManager::setRegionCookie($regid);
}

// --- Send 1x1 GIF and close client connection ---
PixelResponse::sendPixelAndFlush();

// --- Everything below is invisible to the client ---

if (!BotFilter::shouldTrack()) {
    exit;
}

$ip        = getClientIp();
$userAgent = $_SERVER['HTTP_USER_AGENT'] ?? 'Unknown';
$referrer  = $_SERVER['HTTP_REFERER'] ?? 'Direct';
$datetime  = date('Y-m-d H:i:s');

EventBuffer::append('sitepixel', [
    'ip'          => $ip,
    'user_agent'  => $userAgent,
    'referrer'    => $referrer,
    'access_time' => $datetime,
]);