import { Resend } from "resend";
import { render } from "@react-email/render";

let resendClient: Resend | null = null;

function getResendClient(): Resend {
  if (!resendClient) {
    if (!process.env.RESEND_API_KEY) {
      throw new Error("RESEND_API_KEY environment variable is not set");
    }
    resendClient = new Resend(process.env.RESEND_API_KEY);
  }
  return resendClient;
}

export const ADMIN_EMAILS = ["me@hytham.me", "tamara@hytham.me"];

export async function sendEmail({
  to,
  subject,
  react,
  text,
  tags,
  idempotencyKey,
}: {
  to: string | string[];
  subject: string;
  react: React.ReactNode;
  text?: string;
  tags?: { name: string; value: string }[];
  idempotencyKey?: string;
}) {
  const resend = getResendClient();
  
  // Render React component to HTML
  const html = await render(react, {
    pretty: true,
  });
  
  const { data, error } = await resend.emails.send({
    from: "ManoonOils <support@mail.manoonoils.com>",
    replyTo: "support@manoonoils.com",
    to: Array.isArray(to) ? to : [to],
    subject,
    html,
    text,
    tags,
    ...(idempotencyKey && { idempotencyKey }),
  });

  if (error) {
    console.error("Failed to send email:", error);
    throw error;
  }

  return data;
}

export async function sendEmailToCustomer({
  to,
  subject,
  react,
  text,
  language,
  idempotencyKey,
}: {
  to: string;
  subject: string;
  react: React.ReactNode;
  text?: string;
  language: string;
  idempotencyKey?: string;
}) {
  const tag = `customer-${language}`;
  return sendEmail({
    to,
    subject,
    react,
    text,
    tags: [{ name: "type", value: tag }],
    idempotencyKey,
  });
}

export async function sendEmailToAdmin({
  subject,
  react,
  text,
  eventType,
  orderId,
}: {
  subject: string;
  react: React.ReactNode;
  text?: string;
  eventType: string;
  orderId: string;
}) {
  return sendEmail({
    to: ADMIN_EMAILS,
    subject: `[Admin] ${subject}`,
    react,
    text,
    tags: [{ name: "type", value: "admin-notification" }],
    idempotencyKey: `admin-${eventType}/${orderId}`,
  });
}