<?php

require_once("Mail.php");
require_once("Mail/mime.php");

class Emailnotification {
  private $headers = [];
  private $subject;
  private $body;
  private $html;
  private $from_name = false;
  private $email_from = false;
  private $email_to = false;
  private $attachments = [];

  private $object_type = "";
  private $object_id = 0;
  private $object_data = "";

  private $_mimeheaders;
  
  public function __construct($object_type = false, $object_id = false, $object_data = false) {
    $this->headers = [
      'X-Mailer' => MFAPPNAME.' Mailer',
    ];
    
    $this->email_from = TT_OUTGOING_EMAIL;
    $this->from_name = TT_OUTGOING_EMAIL_NAME;

    if($object_type !== false) $this->object_type = $object_type;
    if($object_id !== false) $this->object_id = $object_id;
    if($object_data !== false) $this->object_data = $object_data;
  }
  
  public function addAttachment($filepath = null, $content = null, $name = false, $c_type = "application/octet-stream", $disposition = "attachment", $encoding = "base64" ,  $charset = "utf-8") {
    $attachment = [
        "file" => $filepath,
        "content" => $content,
        "name" => $name,
        "c_type" => $c_type,
        "disposition" => $disposition,
        "encoding" => $encoding,
        "charset" => $charset
    ];
    
    $attachment["isfile"] = false;
    if($filepath) {
      $attachment['isfile'] = true;
    }
    
    $this->attachments[] = $attachment;
  }
  
  public function setHeader($name, $value) {
    $this->headers[$name] = $value;
  }
  
  public function setSubject($subject) {
    $this->subject = $subject;
  }
  
  public function setBody($body) {
    $this->body = $body;
  }
  
  public function setHtmlBody($html) {
    $this->html = $html;
  }
  
  public function setFrom($email, $name = false) {
    $this->email_from = $email;
    $this->from_name = $name;
  }
  
  public function setTo($email) {
    $this->email_to = $email;
  }
  
  public function send() {
    if(!$this->email_to) {
      return false;
    }
    if(!$this->body && !$this->html) {
      return false;
    }
    if(!is_array($this->headers) || !count($this->headers)) {
      return false;
    }
    if(!$this->subject) {
      return false;
    }
    
    if(!array_key_exists("Subject", $this->headers) || !$this->headers['Subject']) {
      $this->setHeader("Subject", $this->subject);
    }
    
    if((!array_key_exists("From", $this->headers) || !$this->headers['From']) && $this->from_name) {
      $this->headers['From']  = '"'.$this->from_name.'" <'.$this->email_from.'>';
    }
    
    $log = mfLoghandler::singleton();
    
    //var_dump($this);exit;
    
    $mimeparams['text_encoding']="8bit";
    $mimeparams['text_charset']="utf-8";
    $mimeparams['html_charset']="utf-8";
    $mimeparams['head_charset']="utf-8";
    
    $mime = new Mail_mime();
    if($this->body) {
      $mime->setTXTBody($this->body);
    }
    if($this->html) {
      $mime->setHTMLBody($this->html);
    }
    
    //var_dump($this->attachments);exit;
    
    if(count($this->attachments)) {
      foreach($this->attachments as $att) {
        if($att['isfile']) {
          $mime->addAttachment($att["file"], $att["c_type"], $att["name"], true, $att['encoding'], $att['disposition'], $att['charset']);
        } else {
          $mime->addAttachment($att["content"], $att["c_type"], $att["name"], false, $att['encoding'], $att['disposition'], $att['charset']);
        }
      }
    }
    
    $body = $mime->get($mimeparams);
    $headers = $mime->headers($this->headers);
    $this->_mimeheaders = $headers;
    //$log->debug(print_r($headers, true));
    
    $mail =& Mail::factory('mail', ["-f ".$this->email_from]);
    /*
     * PHP 8's mail() function now outputs proper line endings in headers (CRLF instead of LF).
     * Mail_mail < 2.0 would detect a unix system and change the headers line ending to LF.
     * On Mail submission to Exim (via sendmail), mail() adds its own headers first with CRLF line ending,
     * making Exim treat every subsequent header's LF as an invalid line ending, adding a whitespace after the LF,
     * making all our custom headers into one long header.
     *
     * See: https://www.exim.org/exim-html-current/doc/html/spec_html/ch-message_processing.html#SECTlineendings
     *
     * So we force CRLF line endings for headers here.
     */
    $mail->sep = "\r\n";
    $mail->send($this->email_to, $headers, $body);

    $this->_createEmailLog();

    return true;
  }

  private function _createEmailLog() {
      if(!$this->object_id || !$this->object_type) return true;

      $log = mfLoghandler::singleton();

      if(array_key_exists("To", $this->_mimeheaders)) {
          $this->_mimeheaders['To'] = $this->email_to;
      }

      FronkDB::singleton()->startTransaction();

      $el = EmailLog::create([
          'object_type' => $this->object_type,
          'object_id' => $this->object_id,
          'object_data' => $this->object_data,
          'from' => $this->email_from,
          'to' => $this->email_to,
          'headers' => json_encode($this->_mimeheaders),
          'subject' => $this->subject,
          'body_text' => $this->body,
          'body_html' => $this->html,
      ]);
      if(!$el->save()) {
          $log->error(__METHOD__.": Error saving EmailLog. {$this->object_type}: {$this->object_id} from: '{$this->email_from}' | to: '{$this->email_to}' | subject: '{$this->subject}'");
          FronkDB::singleton()->rollbackTransaction();
          return false;
      }

      if(is_array($this->attachments) && count($this->attachments)) {
          foreach($this->attachments as $att) {
              if($att['isfile']) {
                  if(!file_exists($att["file"])) {
                      $log->error(__METHOD__.": File not found. ".$this->object_type.": ".$this->object_id." / Filename: ".$att['name']);
                      continue;
                  }
                  $sha256_hash = hash_file("sha256", $att["file"]);
                  $filesize = filesize($att["file"]);
                  $file_content = file_get_contents($att["file"]);
              } else {
                  $sha256_hash = hash("sha256", $att["content"]);
                  $filesize = strlen($att["content"]);
                  $file_content = $att["content"];
              }

              // find attachment content or create it
              $ela_content = EmailLogAttachmentContent::getFirst(['sha256' => $sha256_hash]);
              if(!$ela_content) {
                  $ela_content = EmailLogAttachmentContent::create([
                      'mimetype' => $att['c_type'],
                      'filesize' => $filesize,
                      'sha256' => $sha256_hash,
                      'content' => $file_content,
                  ]);

                  if (!$ela_content->save()) {
                      $log->error(__METHOD__ . ": Error saving EmailLogAttachmentContent. " . $this->object_type . ": " . $this->object_id . " / Filename: " . $att['name']);
                      continue;
                  }
              }

              $ela = EmailLogAttachment::create([
                  'emaillog_id' => $el->id,
                  'content_id' => $ela_content->id,
                  'filename' => $att['name'],
              ]);
              if(!$ela->save()) {
                  $log->error(__METHOD__.": Error saving EmailLogAttachment. ".$this->object_type.": ".$this->object_id." / Filename: ".$att['name']);
              }

          }
      }

      FronkDB::singleton()->commitTransaction();
  }
  
}