import nodemailer from "nodemailer";
import { render } from "@react-email/render";
import ContactMessageEmail, { ContactConfirmationEmail } from "@/components/emails/contact-message";

type ContactEmailData = { name: string; email: string; message: string };

function getTransporter() {
  const port = Number(process.env.SMTP_PORT || 587);
  return nodemailer.createTransport({
    host: process.env.SMTP_HOST,
    port,
    secure: process.env.SMTP_SECURE === "true" || port === 465,
    auth: process.env.SMTP_USER && process.env.SMTP_PASSWORD
      ? { user: process.env.SMTP_USER, pass: process.env.SMTP_PASSWORD }
      : undefined,
  });
}

function getEmailConfig() {
  const from = process.env.SMTP_FROM;
  const to = process.env.SMTP_TO || process.env.NEXT_PUBLIC_CONTACT_EMAIL;
  if (!process.env.SMTP_HOST || !from || !to) throw new Error("SMTP email configuration is incomplete.");
  return { from, to };
}

function getPlainText({ name, email, message }: ContactEmailData) {
  return [`New contact message`, ``, `Name: ${name}`, `Email: ${email}`, ``, message].join("\n");
}

function getConfirmationText(name: string, siteUrl: string) {
  return [`Hi ${name},`, ``, `Your message was received. I will get back to you as soon as possible.`, ``, siteUrl].join("\n");
}

export async function sendContactMessageEmail(data: ContactEmailData) {
  const { from, to } = getEmailConfig();
  const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || "http://localhost:3000";
  const html = await render(ContactMessageEmail({ ...data, siteUrl }));
  const transporter = getTransporter();
  await transporter.sendMail({
    from,
    to,
    replyTo: data.email,
    subject: `New contact message from ${data.name}`,
    text: getPlainText(data),
    html,
  });
  const confirmationHtml = await render(ContactConfirmationEmail({ name: data.name, siteUrl }));
  await transporter.sendMail({
    from,
    to: data.email,
    subject: "Thanks for contacting Diyaa",
    text: getConfirmationText(data.name, siteUrl),
    html: confirmationHtml,
  });
}