import { Injectable } from '@nestjs/common'

export type AttachmentOptions = {
  content: string | Buffer // Base64
  filename: string
  type: 'application/pdf' | string
}

export type MailerSendOptions = {
  to: string
  templateId: string
  substitutions?: { [key: string]: any }
  dynamicTemplateData?: { [key: string]: any }
  sendAt?: Date
  attachments?: Array<AttachmentOptions>
}

@Injectable()
export abstract class MailService {
  abstract send(attrs: MailerSendOptions): Promise<any>
}