import { SESv2Client, SendEmailCommand } from "@aws-sdk/client-sesv2";
import { UseSend } from "usesend-js";

const apiKey = process.env.USESEND_API_KEY;
const baseUrl = process.env.USESEND_BASE_URL;
const awsAccessKey = process.env.AWS_ACCESS_KEY;
const awsSecretKey = process.env.AWS_SECRET_KEY;
const awsRegion = process.env.AWS_DEFAULT_REGION;

export const usesend = apiKey ? new UseSend(apiKey, baseUrl) : null;
const sesClient =
  awsAccessKey && awsSecretKey && awsRegion
    ? new SESv2Client({
        region: awsRegion,
        credentials: {
          accessKeyId: awsAccessKey,
          secretAccessKey: awsSecretKey,
        },
      })
    : null;

export const FROM_EMAIL =
  process.env.USESEND_FROM_EMAIL || "info@rockymountainvending.com";
export const TO_EMAIL =
  process.env.CONTACT_FORM_TO_EMAIL || "info@rockymountainvending.com";

function htmlToText(html: string) {
  return html
    .replace(/<style[\s\S]*?<\/style>/gi, " ")
    .replace(/<script[\s\S]*?<\/script>/gi, " ")
    .replace(/<[^>]+>/g, " ")
    .replace(/&nbsp;/g, " ")
    .replace(/&amp;/g, "&")
    .replace(/&lt;/g, "<")
    .replace(/&gt;/g, ">")
    .replace(/\s+/g, " ")
    .trim();
}

export function isEmailConfigured() {
  return Boolean(usesend || sesClient);
}

export async function sendTransactionalEmail({
  to,
  subject,
  html,
  replyTo,
  from,
}: {
  to: string;
  subject: string;
  html: string;
  replyTo?: string;
  from?: string;
}) {
  const sender = from || FROM_EMAIL;

  if (usesend) {
    return usesend.emails.send({
      from: sender,
      to,
      subject,
      html,
      ...(replyTo ? { replyTo } : {}),
    });
  }

  if (sesClient) {
    return sesClient.send(
      new SendEmailCommand({
        FromEmailAddress: sender,
        Destination: {
          ToAddresses: [to],
        },
        ReplyToAddresses: replyTo ? [replyTo] : undefined,
        Content: {
          Simple: {
            Subject: {
              Data: subject,
            },
            Body: {
              Html: {
                Data: html,
              },
              Text: {
                Data: htmlToText(html),
              },
            },
          },
        },
      })
    );
  }

  throw new Error("No email transport is configured");
}