<?php
declare(strict_types=1);
require_once __DIR__ . '/../../includes/bootstrap_global.php';

require_once __DIR__ . '/../vendor/autoload.php';

use Minishlink\WebPush\WebPush;
use Minishlink\WebPush\Subscription;

$cfg = require __DIR__ . '/config.php';

$auth = [
  'VAPID' => [
    'subject'    => $cfg['vapid_subject'],
    'publicKey'  => $cfg['vapid_public'],
    'privateKey' => $cfg['vapid_private'],
  ],
];

$webPush = new WebPush($auth);
$webPush->setDefaultOptions([
  'TTL' => (int)($cfg['ttl'] ?? 86400),
]);

/**
 * badgeCount = msg_unread + rdv_unread
 * table push_badge_counters est indexée par compte_id (PK)
 */
function computeBadgeCount(PDO $pdo, array $n): int
{
  $cid = (int)($n['target_compte_id'] ?? 0);
  if ($cid <= 0) return 0;

  $st = $pdo->prepare("SELECT msg_unread, rdv_unread FROM push_badge_counters WHERE compte_id = ? LIMIT 1");
  $st->execute([$cid]);
  $row = $st->fetch(PDO::FETCH_ASSOC);

  if (!$row) return 0;

  $total = (int)($row['msg_unread'] ?? 0) + (int)($row['rdv_unread'] ?? 0);
  return max(0, min(99, $total));
}

// 1) lot pending
$notifs = $pdo->query("
  SELECT *
  FROM push_notifications
  WHERE status = 'pending'
  ORDER BY id ASC
  LIMIT 50
")->fetchAll(PDO::FETCH_ASSOC);

if (!$notifs) exit(0);

foreach ($notifs as $n) {
  $nid = (int)$n['id'];

  // 1bis) lock
  $lock = $pdo->prepare("
    UPDATE push_notifications
    SET status='sending'
    WHERE id=? AND status='pending'
  ");
  $lock->execute([$nid]);
  if ($lock->rowCount() === 0) continue;

  // 2) subscriptions cibles
  $where  = ["is_active = 1"];
  $params = [];

  if (!empty($n['target_compte_id'])) {
    $where[] = "compte_id = :cid";
    $params[':cid'] = (int)$n['target_compte_id'];
  } else {
    // fallback (normalement tu as toujours target_compte_id)
    $where[] = "role = :role";
    $params[':role'] = (string)$n['target_role'];

    if (!empty($n['target_reference_id'])) {
      $where[] = "reference_id = :ref";
      $params[':ref'] = (int)$n['target_reference_id'];
    }
  }

  $stmt = $pdo->prepare("
    SELECT id, endpoint, p256dh, auth
    FROM push_subscriptions
    WHERE " . implode(' AND ', $where) . "
  ");
  $stmt->execute($params);
  $subs = $stmt->fetchAll(PDO::FETCH_ASSOC);

  if (!$subs) {
    $pdo->prepare("
      UPDATE push_notifications
      SET status='failed', attempts=attempts+1, last_error='no_subscriptions'
      WHERE id=?
    ")->execute([$nid]);
    continue;
  }

  // 3) payload
  $badgeCount = computeBadgeCount($pdo, $n);
  $payload = [
    'type'       => $n['type'],
    'title'      => $n['title'],
    'body'       => $n['body'],
    'url'        => $n['url'],
    'data'       => $n['data_json'] ? json_decode((string)$n['data_json'], true) : null,
    'nid'        => $nid,
    'badgeCount' => $badgeCount,
  ];
  $payloadJson = json_encode($payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

  // map endpoint => subscription_id
  $subIdByEndpoint = [];

  foreach ($subs as $s) {
    $endpoint = (string)$s['endpoint'];
    $subIdByEndpoint[$endpoint] = (int)$s['id'];

    $subscription = Subscription::create([
      'endpoint'  => $endpoint,
      'publicKey' => (string)$s['p256dh'],
      'authToken' => (string)$s['auth'],
    ]);

    $webPush->queueNotification($subscription, $payloadJson, ['urgency' => 'normal']);
  }

  // 4) flush + delivery log
  $successCount = 0;
  $lastErr      = null;

  $insLog = $pdo->prepare("
    INSERT INTO push_delivery_log
      (notification_id, subscription_id, http_status, error_code, error_message, created_at)
    VALUES
      (:nid, :sid, :http, :ecode, :emsg, NOW())
  ");

  foreach ($webPush->flush() as $report) {
    $ok = $report->isSuccess();

    $endpoint   = (string)$report->getRequest()->getUri();
    $sid        = $subIdByEndpoint[$endpoint] ?? null;
    $statusCode = $report->getResponse() ? $report->getResponse()->getStatusCode() : null;
    $reason     = $ok ? null : (string)$report->getReason();

    if ($ok) $successCount++;

    if ($sid) {
      $insLog->execute([
        ':nid'   => $nid,
        ':sid'   => $sid,
        ':http'  => $statusCode,
        ':ecode' => (!$ok && in_array((int)$statusCode, [404, 410], true)) ? 'gone' : null,
        ':emsg'  => $reason ? mb_substr($reason, 0, 255) : null,
      ]);
    }

    if (!$ok && in_array((int)$statusCode, [404, 410], true)) {
      $pdo->prepare("UPDATE push_subscriptions SET is_active=0 WHERE endpoint=?")->execute([$endpoint]);
    }

    if (!$ok && $reason) $lastErr = $reason;
  }

  // 5) statut notification
  if ($successCount > 0) {
    $pdo->prepare("
      UPDATE push_notifications
      SET status='sent', sent_at=NOW(), attempts=attempts+1, last_error=NULL
      WHERE id=?
    ")->execute([$nid]);
  } else {
    $pdo->prepare("
      UPDATE push_notifications
      SET status='failed', attempts=attempts+1, last_error=?
      WHERE id=?
    ")->execute([mb_substr((string)$lastErr, 0, 255), $nid]);
  }
}