feat(notifications) : notify guide publications and admin hearts; simplify Stygian navigation

lib/guides/notifications.ts

@@ -0,0 +1,36 @@
+import "server-only";
+
+import { and, asc, eq, gt, isNull, lte, sql } from "drizzle-orm";
+import { getDb } from "@/db";
+import { guides, users } from "@/db/schema";
+import type { OutboxEventLike } from "@/lib/events/invalidation";
+import { createNotifications } from "@/lib/notifications/repository";
+
+export async function sendGuidePublicationNotifications(event: OutboxEventLike) {
+  const publishedAt = typeof event.payload.publishedAt === "string"
+    ? new Date(event.payload.publishedAt) : null;
+  if (event.eventType !== "guide.published" || event.topic !== "notifications:guide"
+    || !publishedAt || Number.isNaN(publishedAt.getTime())) {
+    throw new Error("Invalid guide publication notification event");
+  }
+  const db = getDb();
+  const [guide] = await db.select({ name: guides.name, slug: guides.slug }).from(guides)
+    .where(and(eq(guides.id, event.aggregateId), eq(guides.isPublic, true), isNull(guides.trashedAt))).limit(1);
+  if (!guide) return;
+
+  let cursor: string | undefined;
+  while (true) {
+    const recipients: { id: string }[] = await db.select({ id: users.id }).from(users)
+      .where(and(sql`${users.banned} is not true`, lte(users.createdAt, publishedAt),
+        cursor === undefined ? undefined : gt(users.id, cursor)))
+      .orderBy(asc(users.id)).limit(100);
+    if (!recipients.length) return;
+    await createNotifications(recipients.map(user => ({ userId: user.id, url: `/${guide.slug}` })), {
+      eventKey: `guide:${event.aggregateId}:published`,
+      kind: "guide_published",
+      title: "เผยแพร่ Guide ใหม่",
+      body: `อ่าน Guide ${guide.name} ได้แล้ว`,
+    });
+    cursor = recipients[recipients.length - 1].id;
+  }
+}