<?php

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

class mailer{


	public function __construct($_db){

		if( empty($_db["pdo1"]) ){

			exit(json_encode(["success"=>0, "message"=>"Error: Developer need to define pdo1 - class mailer"]));
		}

		$this->pdo1 = $_db["pdo1"];
	}


	public function get_authen($input = array()){

		$revise = [];
		$revise["company_id"] = $input["company_id"];

		// If SMTP config passed directly, use it (e.g. system default from config.php)
		if( !empty($input["smtp"]) && count($input["smtp"]) > 0 ){
			return $input["smtp"];
		}

		// Otherwise read from company_smtp on pdo1 (wms)
		$sth = $this->pdo1->prepare("SELECT * FROM company_smtp WHERE company_id = :company_id");
		$sth->execute([":company_id" => $revise["company_id"]]);

		$res = $sth->fetch(PDO::FETCH_ASSOC);

		if( empty($res) ){
			$answer = [];
			$answer["success"] = 0;
			$answer["message"] = "<b>Error:</b> You haven't set SMTP Server yet<br>----------<br>กรุณาตั้งค่า SMTP Server ก่อนส่ง Email";
			exit(json_encode($answer));
		}

		return $res;
	}


	private function check_required_fields($input=[]){

		$revise = [];

		$revise["class"] 	= $input["class"];
		$revise["function"] = $input["function"];
		$revise["require"] 	= $input["require"];
		$revise["input"] 	= $input["input"];

		foreach ($revise["require"] as $key => $item) {

			if( !isset($revise["input"][$item]) ){
				exit(json_encode(["success"=>0, "message"=>"Error: class {$revise["class"]}->{$revise["function"]} => {$item} cannot be empty"]));
			}
		}
	}


	private function decrypt($input){

		$this->check_required_fields([
			"class"		=> "mailer",
			"function"	=> "decrypt",
			"require" 	=> ["key","data"],
			"input" 	=> $input
		]);

		return openssl_decrypt(trim($input["data"]), "AES-256-CBC", $input["key"], 0, "1234567890123456" );
	}
	

	public function send_email($input = array()){

		$this->check_required_fields([
			"class"		=> "mailer",
			"function"	=> "send_email",
			"require" 	=> ["subject","message","company_id"],
			"input" 	=> $input
		]);

		// When silent=true, return false on failure instead of calling exit().
		$silent = !empty($input['silent']);

		$revise 				= [];
		$revise["subject"]		= $input["subject"];
		$revise["message"]		= $input["message"];
		$revise["channel_name"]	= $input["channel_name"];
		$revise["to"]			= $input["to"];
		$revise["key"]			= $input["key"];
		$company_id				= $input["company_id"];
		$authen 				= $this->get_authen($input);


	require_once dirname(__FILE__).'/phpmailer/vendor/autoload.php';

	$mail = new PHPMailer(true);

	try {
			$mail->SMTPDebug  = false;
			$mail->isSMTP();
			$mail->CharSet 	  = "UTF-8";
			$mail->Host       = $authen["server"];
			$mail->SMTPAuth   = true;
			$mail->Timeout    = 20;
			$mail->Username   = $authen["username"];
			$mail->Password   = $this->decrypt(["data"=>$authen["password"],"key"=>$revise["key"]]);
            
			$port = (string)$authen["port"];
			if ($port === "465") {
				$mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;
			} elseif ($port === "587" || $port === "25") {
				$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
			} else {
				$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;
			}

      $mail->Port = $authen["port"];

			$mail->SMTPOptions = [
				'socket' => ['bindto' => '0.0.0.0:0']
			];

			// Sender
			$from_email = !empty($authen["from_email"]) ? $authen["from_email"] : $authen["username"];
			$from_name  = !empty($revise["channel_name"]) ? $revise["channel_name"]
									: (!empty($authen["from_name"]) ? $authen["from_name"] : $authen["username"]);
			$mail->setFrom($from_email, $from_name);

			$des = explode(",", $revise["to"]);
			foreach ($des as $key => $value) {
					$mail->addAddress(trim($value));
			}

			$mail->isHTML(true);
			$mail->Subject = $revise["subject"];
			$mail->Body    = nl2br($revise["message"]);
			$mail->AltBody = $revise["message"];

			$mail->send();
		return true;
		}
    catch (phpmailerException $e) {
			$err = "<b>Error1</b>: " . nl2br($e->errorMessage());
			if ($silent) { error_log('[mailer] ' . strip_tags($err)); return false; }
			exit(json_encode(["success" => 0, "message" => $err]));
		}
    catch (Exception $e) {
			$err = "<b>Error2</b>: " . nl2br($mail->ErrorInfo);
			if ($silent) { error_log('[mailer] ' . strip_tags($err)); return false; }
			exit(json_encode(["success" => 0, "message" => $err]));
    }

	}

}

?>