Add email notification on new lesson comment

Notify admins/curators (or configured notificationEmails) when a student
leaves a comment under a lesson. New setting notifyOnComment (default on) +
toggle in admin settings. Fires only for student comments, not admin/curator
replies; comment text is HTML-escaped in the email.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/admin/settings-form.tsx

@@ -274,6 +274,11 @@ export function SettingsForm({ initial }: { initial: Settings }) {
             checked={bool("notifyOnHomework")}
             onChange={(v) => set("notifyOnHomework", v ? "true" : "false")}
           />
+          <Toggle
+            label="Уведомлять о новом комментарии под уроком"
+            checked={bool("notifyOnComment")}
+            onChange={(v) => set("notifyOnComment", v ? "true" : "false")}
+          />
           <Toggle
             label="Уведомлять о новой регистрации ученика"
             checked={bool("notifyOnRegistration")}

src/lib/actions/student-actions.ts

@@ -4,7 +4,7 @@ import { prisma } from "@/lib/prisma";
 import { auth } from "@/lib/auth";
 import { headers } from "next/headers";
 import { revalidatePath } from "next/cache";
-import { sendHomeworkSubmittedEmail } from "@/lib/email";
+import { sendHomeworkSubmittedEmail, sendCommentNotificationEmail } from "@/lib/email";
 import { getSettings, parseNotificationEmails, asBool } from "@/lib/settings";
 
 // ── Lesson Progress ───────────────────────────────────────────────────────────
@@ -156,7 +156,7 @@ export async function addComment(lessonId: string, slug: string, text: string, p
 
   const lesson = await prisma.lesson.findUnique({
     where: { id: lessonId },
-    select: { module: { select: { course: { select: { id: true } } } } },
+    select: { title: true, module: { select: { course: { select: { id: true, slug: true } } } } },
   });
   if (!lesson) throw new Error("Lesson not found");
 
@@ -185,6 +185,26 @@ export async function addComment(lessonId: string, slug: string, text: string, p
     data: { lessonId, userId: session.user.id, text: trimmed, ...(parentId ? { parentId } : {}) },
   });
 
+  // Уведомление админам/кураторам о новом комментарии студента (не о своих ответах)
+  if (!isAdmin && !isCurator) {
+    const settings = await getSettings();
+    if (asBool(settings.notifyOnComment)) {
+      const configured = parseNotificationEmails(settings.notificationEmails);
+      const recipients = configured.length > 0
+        ? configured.map((email) => ({ email, name: "" }))
+        : await prisma.user.findMany({
+            where: { role: { in: ["admin", "curator"] } },
+            select: { email: true, name: true },
+          });
+      const lessonUrl = `${process.env.BETTER_AUTH_URL ?? "https://school.second-brain.ru"}/courses/${slug}/lessons/${lessonId}`;
+      await Promise.all(
+        recipients.map((r) =>
+          sendCommentNotificationEmail(r.email, r.name, session.user.name, lesson.title, trimmed, lessonUrl)
+        )
+      );
+    }
+  }
+
   revalidatePath(`/courses/${slug}/lessons/${lessonId}`);
 }
 

src/lib/email.ts

@@ -137,6 +137,31 @@ export async function sendHomeworkSubmittedEmail(
   }).catch((e) => console.error("[email] sendHomeworkSubmittedEmail:", e));
 }
 
+export async function sendCommentNotificationEmail(
+  to: string,
+  recipientName: string,
+  studentName: string,
+  lessonTitle: string,
+  commentText: string,
+  lessonUrl: string
+) {
+  const school = await getSchoolName();
+  const esc = (t: string) => t.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
+  const preview = commentText.length > 400 ? commentText.slice(0, 400) + "…" : commentText;
+  await getResend().emails.send({
+    from: FROM,
+    to,
+    subject: `Новый комментарий под уроком — ${lessonTitle}`,
+    html: base(`
+      <p ${p}>Привет${recipientName ? `, ${esc(recipientName)}` : ""}!</p>
+      <p ${p}><strong>${esc(studentName)}</strong> оставил комментарий под уроком <strong>«${lessonTitle}»</strong>:</p>
+      ${quote(esc(preview))}
+      <p ${pLast}>Открыть урок и ответить:</p>
+      ${btn(lessonUrl, "Открыть урок")}
+    `, school),
+  }).catch((e) => console.error("[email] sendCommentNotificationEmail:", e));
+}
+
 export async function sendFeedbackReceivedEmail(
   to: string,
   studentName: string,

src/lib/settings.ts

@@ -14,6 +14,7 @@ export const SETTINGS_DEFAULTS = {
   // Notifications
   notificationEmails: "", // newline-separated list
   notifyOnHomework: "true",
+  notifyOnComment: "true",
   notifyOnRegistration: "true",
   notifyStudentOnFeedback: "true",