Assist_Design/apps/bff/src/common/email/providers/sendgrid.provider.ts

import { Injectable, Inject } from "@nestjs/common";
import { ConfigService } from "@nestjs/config";
import { Logger } from "nestjs-pino";
import sgMail from "@sendgrid/mail";
import type { SendEmailOptions } from "../email.service";

@Injectable()
export class SendGridEmailProvider {
  private readonly fromEmail: string;
  private readonly fromName?: string;

  constructor(
    private readonly config: ConfigService,
    @Inject(Logger) private readonly logger: Logger
  ) {
    const apiKey = this.config.get<string>("SENDGRID_API_KEY");
    if (apiKey) {
      sgMail.setApiKey(apiKey);
    }
    const sandbox = this.config.get("SENDGRID_SANDBOX", "false") === "true";
    sgMail.setSubstitutionWrappers("{{", "}}");
    (sgMail as any).setClient({ mailSettings: { sandboxMode: { enable: sandbox } } });
    this.fromEmail = this.config.get<string>("EMAIL_FROM", "no-reply@example.com");
    this.fromName = this.config.get<string>("EMAIL_FROM_NAME");
  }

  async send(options: SendEmailOptions): Promise<void> {
    const to = Array.isArray(options.to) ? options.to : [options.to];

    const msg: sgMail.MailDataRequired = {
      to,
      from: this.fromName ? { email: this.fromEmail, name: this.fromName } : this.fromEmail,
      subject: options.subject,
      text: options.text,
      html: options.html,
      templateId: options.templateId,
      dynamicTemplateData: options.dynamicTemplateData,
    } as sgMail.MailDataRequired;

    try {
      await sgMail.send(msg);
      this.logger.log("SendGrid email sent", { to, subject: options.subject });
    } catch (error) {
      this.logger.error("SendGrid send failed", {
        error:
          error instanceof Error ? { name: error.name, message: error.message } : String(error),
      });
      throw error;
    }
  }
}