<?php

class Sendgrid {

    public $reply = '', $replyEmail = '', $from = '', $fromEmail = '', $cc = '', $bcc = '';

    public function send($to = null, $subject = null, $body = null, array $attachmentFiles = null)
    {
        if (is_null($to) OR is_null($subject) OR is_null($body)) {
            return false;
        }

        $headers = array(
            'Authorization: Bearer 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',
            'Content-Type: application/json'
        );

        $data = array(
            'personalizations' => array(
                array(
                    'to' => array(
                        array(
                            'email' => $to,
                        )
                    )
                )
            ),
            'from' => array(
                'email' => $this->fromEmail,
                'name'  => $this->from,
            ),
            'reply_to' => array(
                'email' => $this->replyEmail,
                'name'  => $this->reply,
            ),
            'subject' => $subject,
            'content' => array(
                array(
                    'type' => 'text/html',
                    'value' => $body
                )
            )
        );
        if ($this->cc) {
            foreach (explode(',', $this->cc) as $k => $cc) {
                $ccs[$k]['email']  = trim($cc);
            }
            $data['personalizations'][0]['cc'] = $ccs;
        }
        if ($this->bcc) {
            foreach (explode(',', $this->bcc) as $k => $bcc) {
                $bccs[$k]['email']  = trim($bcc);
            }
            $data['personalizations'][0]['bcc'] = $bccs;
        }

        if ($attachmentFiles && ! empty($attachmentFiles)) {
            foreach ($attachmentFiles as $k => $attachment) {
                $attachments[$k]['content']  = base64_encode(file_get_contents($attachment));
                $attachments[$k]['type']     = 'text/html';
                $attachments[$k]['filename'] = $attachment;
            }
            $data['attachments'] = $attachments;
        }

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'https://api.sendgrid.com/v3/mail/send');
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_exec($ch);
        curl_close($ch);
    }
}

$sendgrid = new Sendgrid();

// $sendgrid->from = 'TPI';
// $sendgrid->fromEmail = 'info@thepharmajournal.com';

// $sendgrid->reply = 'Akinik Subs';
// $sendgrid->replyEmail = 'akiniksubs@gmail.com';
// $sendgrid->send('akinikbooks@gmail.com', 'This is subject', 'This is message '.date('d/m/Y h:i:s A').PHP_EOL.PHP_EOL);

// $sendgrid->reply = 'Akinik Books';
// $sendgrid->replyEmail = 'akinikbooks@gmail.com';
// $sendgrid->send('akiniksubs@gmail.com', 'This is subject', 'This is message '.date('d/m/Y h:i:s A').PHP_EOL.PHP_EOL);
?>