import { Injectable } from '@nestjs/common';

import { PrismaService } from '../prisma/prisma.service';
import { MailTemplate, renderMail } from './mail-templates';

/**
 * Enqueues transactional mail into the outbox. Actual delivery happens
 * asynchronously in MailWorker — callers never wait on SMTP.
 */
@Injectable()
export class MailService {
  constructor(private readonly prisma: PrismaService) {}

  async enqueue(
    to: string,
    template: MailTemplate,
    params: { displayName: string; link: string },
    locale: 'de' | 'en',
  ): Promise<void> {
    const rendered = renderMail(template, params, locale);
    await this.enqueueRaw(to, rendered.subject, rendered.text, rendered.html);
  }

  /** Pre-rendered mails (the #95 digests build their own body). */
  async enqueueRaw(to: string, subject: string, text: string, html: string): Promise<void> {
    await this.prisma.mailOutbox.create({
      data: { toAddress: to, subject, textBody: text, htmlBody: html },
    });
  }
}