chore: server-and-serverless template

packages/functions/src/lib/email-service.ts

@@ -0,0 +1,45 @@
+import { LocalEmailService, type EmailService, type SendEmailInput, type SendEmailResult } from '@pikku/core/services'
+import { renderEmailTemplate, type EmailTemplateName } from '../../.pikku/email/pikku-emails.gen.js'
+
+type GeneratedTemplateEmailServiceOptions = {
+  delegate?: EmailService
+  defaultLocale?: string
+}
+
+export class GeneratedTemplateEmailService implements EmailService {
+  private readonly delegate: EmailService
+  private readonly defaultLocale: string
+
+  constructor(options: GeneratedTemplateEmailServiceOptions = {}) {
+    this.delegate = options.delegate ?? new LocalEmailService()
+    this.defaultLocale = options.defaultLocale ?? 'en'
+  }
+
+  async send(input: SendEmailInput): Promise<SendEmailResult> {
+    if (!('template' in input) || !input.template) {
+      return this.delegate.send(input)
+    }
+
+    const rendered = renderEmailTemplate({
+      name: input.template.name as EmailTemplateName,
+      locale: (input.template.locale ?? this.defaultLocale) as Parameters<typeof renderEmailTemplate>[0]['locale'],
+      data: input.template.data ?? {},
+    })
+
+    return this.delegate.send({
+      to: input.to,
+      from: input.from,
+      cc: input.cc,
+      bcc: input.bcc,
+      replyTo: input.replyTo,
+      headers: {
+        ...(input.headers ?? {}),
+        'x-pikku-email-template': String(input.template.name),
+        'x-pikku-email-hash': rendered.hash,
+      },
+      subject: rendered.subject,
+      html: rendered.html,
+      ...(rendered.text ? { text: rendered.text } : {}),
+    })
+  }
+}