<?php
// WEVAL — Chatbot→Sales Conversion Tracking Endpoint
// Non-blocking insert + JSON response
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') { http_response_code(204); exit; }

$input = json_decode(file_get_contents('php://input'), true) ?: [];
$event = $input['event'] ?? '';
$session_id = $input['session_id'] ?? ('anon-' . substr(md5(($_SERVER['REMOTE_ADDR']??'') . date('Ymd')), 0, 16));
$vertical = $input['vertical'] ?? null;
$source = $input['source'] ?? null;
$data = $input['data'] ?? null;
$url = $input['url'] ?? ($_SERVER['HTTP_REFERER'] ?? null);
$referrer = $input['referrer'] ?? null;

if (empty($event)) {
  http_response_code(400);
  echo json_encode(['ok' => false, 'error' => 'event required']);
  exit;
}

$ip = $_SERVER['HTTP_CF_CONNECTING_IP'] ?? ($_SERVER['HTTP_X_FORWARDED_FOR'] ?? ($_SERVER['REMOTE_ADDR'] ?? null));
if ($ip && strpos($ip, ',') !== false) $ip = trim(explode(',', $ip)[0]);
$ua = substr($_SERVER['HTTP_USER_AGENT'] ?? '', 0, 500);

try {
  $pdo = new PDO('pgsql:host=10.1.0.3;port=5432;dbname=adx_system', 'admin', 'admin123', [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_TIMEOUT => 3
  ]);
  $stmt = $pdo->prepare('INSERT INTO chatbot_conversions (session_id, event, vertical, source, data, url, referrer, ip, user_agent) VALUES (?, ?, ?, ?, ?::jsonb, ?, ?, ?, ?)');
  $stmt->execute([
    $session_id, $event, $vertical, $source,
    $data ? json_encode($data) : null,
    $url, $referrer, $ip, $ua
  ]);
  echo json_encode(['ok' => true, 'session_id' => $session_id, 'event' => $event]);
} catch (Exception $e) {
  error_log('[chatbot-conv-track] ' . $e->getMessage());
  echo json_encode(['ok' => false, 'error' => 'store_failed']);
}