<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

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

$MAILCFG = require __DIR__.'/mail_config.php';

/**
 * Envoie un mail HTML via SMTP Gandi.
 *
 * @param string       $to    Adresse destinataire
 * @param string       $subject Sujet (UTF-8)
 * @param string       $html  Corps HTML
 * @param string|null  $text  Alternative texte (sinon strip_tags)
 * @param array        $opts  ['to_name','cc'=>[],'bcc'=>[],'attachments'=>[],'headers'=>[],'from'=>[email,name],'reply_to'=>[email,name]]
 * @return array [bool success, ?string error]
 */
function uslugi_mail(string $to, string $subject, string $html, ?string $text = null, array $opts = []): array {
  global $MAILCFG;

  $mail = new PHPMailer(true);
  try {
    // SMTP
    $mail->isSMTP();
    $mail->Host       = $MAILCFG['smtp']['host'];
    $mail->Port       = $MAILCFG['smtp']['port'];
    $mail->SMTPSecure = $MAILCFG['smtp']['secure'];
    $mail->SMTPAuth   = $MAILCFG['smtp']['auth'];
    $mail->Username   = $MAILCFG['smtp']['username'];
    $mail->Password   = $MAILCFG['smtp']['password'];

    // Base
    $mail->CharSet  = 'UTF-8';
    $mail->Encoding = 'base64';
    $mail->XMailer  = ''; // pas d'X-Mailer bavard

    // Expéditeur / Reply-To
    $from = $opts['from']     ?? $MAILCFG['from'];
    $rpto = $opts['reply_to'] ?? $MAILCFG['reply_to'];
    $mail->setFrom($from[0],  $from[1] ?? '');
    if (!empty($rpto[0])) $mail->addReplyTo($rpto[0], $rpto[1] ?? '');

    // Return-Path (enveloppe) → SPF/DMARC alignés
    if (!empty($MAILCFG['bounce'])) $mail->Sender = $MAILCFG['bounce'];

    // Destinataires
    $mail->addAddress($to, $opts['to_name'] ?? '');
    foreach (($opts['cc']  ?? []) as $cc)  { $mail->addCC($cc); }
    foreach (($opts['bcc'] ?? []) as $bcc) { $mail->addBCC($bcc); }

    // Pièces jointes
    foreach (($opts['attachments'] ?? []) as $k => $v) {
      if (is_int($k)) $mail->addAttachment($v);
      else            $mail->addAttachment($k, $v);
    }

    // Entêtes optionnelles
    foreach (($opts['headers'] ?? []) as $k => $v) {
      $mail->addCustomHeader($k, $v);
    }
    if (!empty($MAILCFG['suppress_auto'])) {
      $mail->addCustomHeader('Auto-Submitted', 'auto-generated');
      $mail->addCustomHeader('X-Auto-Response-Suppress', 'All');
    }

    // Contenu
    $mail->isHTML(true);
    $mail->Subject = $subject;        // PHPMailer encode proprement
    $mail->Body    = $html;
    $mail->AltBody = $text ?? strip_tags($html);

    $mail->send();
    return [true, null];

  } catch (Exception $e) {
    error_log('PHPMailer error: '.$mail->ErrorInfo);
    return [false, $mail->ErrorInfo];
  }
}