<?php
header('Content-Type: multipart/form-data');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: DELETE, HEAD, GET, OPTIONS, POST, PUT');
header('Access-Control-Allow-Headers: Content-Type, Content-Range, Content-Disposition, Content-Description');
const SMTP_USERNAME = "";
const SMTP_PASSWORD = "";
const SMTP_FROM_EMAIL = "";
const SMTP_FROM_NAME = "";
const SMTP_TARGET_EMAIL = "";
const SMTP_CC_EMAIL = "";
const SMTP_HOST = "";
const SMTP_SUBJECT = "";
// enable preflight request
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}
// require PHPMailer
require './phpmailer/PHPMailerAutoload.php';
//test request is valid, if not return 400 - bad request
if (!isRequestValid()) {
    http_response_code(400);
    echo "Invalid request";
    exit();
}
// collect POST data from request
$name = $_POST['name'];
$email = $_POST['email'];
$phone = $_POST['phone'];
$message = $_POST['message'];
if (!isDataValid($name, $email, $phone, $message)) {
    http_response_code(400);
    echo "Invalid data";
    exit();
}
// Send email function call
sendMail($name, $email, $phone, $message);
// Check if request method is POST
function isRequestValid() {
    if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
        return false;
    }
    return true;
}
function isDataValid($name, $email, $phone, $message) {
    if (empty($name)) {
        return false;
    }
    if (empty($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
        return false;
    }
    if (empty($phone)) {
        return false;
    }
    if (empty($message)) {
        return false;
    }
    return true;
}
function sendMail($name, $email, $phone, $message) {
    $mail = new PHPMailer;
    $mail->SMTPDebug = 0;
    $mail->isSMTP();
    $mail->CharSet="UTF-8";
    $mail->Host = SMTP_HOST;
    $mail->SMTPAuth = true;
    $mail->Username = SMTP_USERNAME;
    $mail->Password = SMTP_PASSWORD;
    // TLS || SSL
    $mail->SMTPSecure = 'tls';
    // TCP PORT
    $mail->Port = 587;
    $mail->setFrom(SMTP_FROM_EMAIL, SMTP_FROM_NAME);
    $mail->addAddress(SMTP_TARGET_EMAIL);
    $mail->addCC(SMTP_CC_EMAIL);
    $mail->addBcc(SMTP_BCC_EMAIL);
    $mail->addReplyTo($email, $name);
    // Set email body content to HTML so you can embed HTML tags like <h1></h1>, <br>, etc.
    $mail->isHTML(true);
    $mail->Subject = SMTP_SUBJECT;
    $mail->Body = "MENO: $name, EMAIL: $email, PHONE: $phone, MESSAGE: $message";
    if(!$mail->send()) {
        http_response_code(500);
        echo "Encountered error while sending email.";
        exit();
    } else {
        http_response_code(200);
    }
}
?>