import fs from "fs";
import { join } from "path";

const createEmailFunction = ({
  netlifyConfig,
}: {
  netlifyConfig: { functions: { [key: string]: { included_files: string[] } } };
}): void => {
  console.info("Creating function for Netlify Emails integration");
  const emailsDirectory = process.env.NETLIFY_EMAILS_DIRECTORY ?? "./emails";

  if (netlifyConfig.functions?.emails?.included_files !== undefined) {
    netlifyConfig.functions.emails.included_files.push(`${emailsDirectory}/**`);
  } else {
    netlifyConfig.functions.emails = {
      ...netlifyConfig.functions.emails,
      included_files: [`${emailsDirectory}/**`],
    };
  }

  const emailFunctionDirectory = join(
    ".netlify",
    "functions-internal",
    "emails"
  );

  fs.mkdirSync(emailFunctionDirectory, {
    recursive: true,
  });

  // Clean the email function directory
  fs.readdirSync(emailFunctionDirectory).forEach((file) => {
    fs.unlinkSync(join(emailFunctionDirectory, file));
  });

  fs.copyFileSync(
    join(__dirname, "../src", "handler", "index.js"),
    join(emailFunctionDirectory, "index.js")
  );
};

export const onBuild = createEmailFunction;

export const onDev = createEmailFunction;