verification emails and full email setup

packages/backend/src/lib/email/service.ts

@@ -0,0 +1,54 @@
+import { render } from "@react-email/render";
+import type React from "react";
+import { Resend } from "resend";
+
+const resend = new Resend(process.env.RESEND_API_KEY);
+
+const FROM_EMAIL = process.env.EMAIL_FROM || "Sprint <noreply@sprint.app>";
+
+export interface SendEmailOptions {
+    to: string;
+    subject: string;
+    template: React.ReactElement;
+    from?: string;
+}
+
+export async function sendEmail({ to, subject, template, from }: SendEmailOptions) {
+    const html = await render(template);
+
+    const { data, error } = await resend.emails.send({
+        from: from || FROM_EMAIL,
+        to,
+        subject,
+        html,
+    });
+
+    if (error) {
+        console.error("Failed to send email:", error);
+        throw new Error(`Email send failed: ${error.message}`);
+    }
+
+    return data;
+}
+
+export async function sendEmailWithRetry(
+    options: SendEmailOptions,
+    maxRetries = 3,
+): Promise<ReturnType<typeof sendEmail>> {
+    let lastError: Error | undefined;
+
+    for (let attempt = 1; attempt <= maxRetries; attempt++) {
+        try {
+            return await sendEmail(options);
+        } catch (error) {
+            lastError = error as Error;
+            console.warn(`Email send attempt ${attempt} failed:`, error);
+
+            if (attempt < maxRetries) {
+                await new Promise((resolve) => setTimeout(resolve, 1000 * 2 ** (attempt - 1)));
+            }
+        }
+    }
+
+    throw lastError || new Error("Email send failed after all retries");
+}