feat(server): supplement team email remind (#9483)

fix PD-2047 AF-1996

packages/backend/server/src/plugins/payment/cron.ts

@@ -17,6 +17,77 @@ export class SubscriptionCronJobs {
     private readonly event: EventEmitter
   ) {}
 
+  private getDateRange(after: number, base: number | Date = Date.now()) {
+    const start = new Date(base);
+    start.setDate(start.getDate() + after);
+    start.setHours(0, 0, 0, 0);
+
+    const end = new Date(start);
+    end.setHours(23, 59, 59, 999);
+
+    return { start, end };
+  }
+
+  // TODO(@darkskygit): enable this after the cluster event system is ready
+  // @Cron(CronExpression.EVERY_DAY_AT_MIDNIGHT /* everyday at 12am */)
+  async notifyExpiredWorkspace() {
+    const { start: after30DayStart, end: after30DayEnd } =
+      this.getDateRange(30);
+    const { start: todayStart, end: todayEnd } = this.getDateRange(0);
+    const { start: before150DaysStart, end: before150DaysEnd } =
+      this.getDateRange(-150);
+    const { start: before180DaysStart, end: before180DaysEnd } =
+      this.getDateRange(-180);
+
+    const subscriptions = await this.db.subscription.findMany({
+      where: {
+        plan: SubscriptionPlan.Team,
+        OR: [
+          {
+            // subscription will cancel after 30 days
+            status: 'active',
+            canceledAt: { not: null },
+            end: { gte: after30DayStart, lte: after30DayEnd },
+          },
+          {
+            // subscription will cancel today
+            status: 'active',
+            canceledAt: { not: null },
+            end: { gte: todayStart, lte: todayEnd },
+          },
+          {
+            // subscription has been canceled for 150 days
+            // workspace becomes delete after 180 days
+            status: 'canceled',
+            canceledAt: { gte: before150DaysStart, lte: before150DaysEnd },
+          },
+          {
+            // subscription has been canceled for 180 days
+            // workspace becomes delete after 180 days
+            status: 'canceled',
+            canceledAt: { gte: before180DaysStart, lte: before180DaysEnd },
+          },
+        ],
+      },
+    });
+
+    for (const subscription of subscriptions) {
+      const end = subscription.end;
+      if (!end) {
+        // should not reach here
+        continue;
+      }
+      this.event.emit('workspace.subscription.notify', {
+        workspaceId: subscription.targetId,
+        expirationDate: end,
+        deletionDate:
+          subscription.status === 'canceled'
+            ? this.getDateRange(180, end).end
+            : undefined,
+      });
+    }
+  }
+
   @Cron(CronExpression.EVERY_HOUR)
   async cleanExpiredOnetimeSubscriptions() {
     const subscriptions = await this.db.subscription.findMany({