import { SendMailOptions } from 'nodemailer';

declare module 'meteor/email' {
    namespace Email {
      /**
       * ExtraMailOptions is intentionally left empty here, but can be
       * overridden in your application if desired. This should not be necessary
       * if you're using the default mail transport, but if you're using a
       * custom transport or have configured hooks which accept additional
       * options, you may need to define this interface to match your custom
       * options.
       */
      interface ExtraMailOptions {}
      type EmailOptions = { mailComposer: MailComposer } | (ExtraMailOptions & SendMailOptions)

      type CustomEmailOptions = EmailOptions & {
        packageSettings?: unknown;
      }

      function send(options: EmailOptions): void;
      function sendAsync(options: EmailOptions): Promise<void>;
      function hookSend(fn: (options: EmailOptions) => boolean): void;
      function customTransport(fn: (options: CustomEmailOptions) => void): void;
    }

    interface MailComposerOptions {
        escapeSMTP: boolean;
        encoding: string;
        charset: string;
        keepBcc: boolean;
        forceEmbeddedImages: boolean;
    }

    var MailComposer: MailComposerStatic;
    interface MailComposerStatic {
        new (options: MailComposerOptions): MailComposer;
    }

    interface MailComposer {
        addHeader(name: string, value: string): void;
        setMessageOption(from: string, to: string, body: string, html: string): void;
        streamMessage(): void;
        pipe(stream: any /** fs.WriteStream **/): void;
    }
}