refactor: subscriptions to nestjs

packages/server-nest/src/modules/Subscription/commands/ChangeLemonSubscription.service.ts

@@ -0,0 +1,54 @@
+
+import { updateSubscription } from '@lemonsqueezy/lemonsqueezy.js';
+import { configureLemonSqueezy } from '../utils';
+import { IOrganizationSubscriptionChanged } from '../types';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { Inject, Injectable } from '@nestjs/common';
+import { PlanSubscription } from '../models/PlanSubscription';
+import { events } from '@/common/events/events';
+import { ServiceError } from '@/modules/Items/ServiceError';
+
+@Injectable()
+export class ChangeLemonSubscription {
+  constructor(
+    public readonly eventEmitter: EventEmitter2,
+
+    @Inject(PlanSubscription.name)
+    private readonly planSubscriptionModel: typeof PlanSubscription,
+  ) {}
+
+  /**
+   * Changes the given organization subscription plan.
+   * @param {number} tenantId - Tenant id.
+   * @param {number} newVariantId - New variant id.
+   * @returns {Promise<void>}
+   */
+  public async changeSubscriptionPlan(
+    newVariantId: number,
+    subscriptionSlug: string = 'main',
+  ) {
+    configureLemonSqueezy();
+
+    const subscription = await this.planSubscriptionModel.query().findOne({
+      slug: subscriptionSlug,
+    });
+    const lemonSubscriptionId = subscription.lemonSubscriptionId;
+
+    // Send request to Lemon Squeezy to change the subscription.
+    const updatedSub = await updateSubscription(lemonSubscriptionId, {
+      variantId: newVariantId,
+      invoiceImmediately: true,
+    });
+    if (updatedSub.error) {
+      throw new ServiceError('SOMETHING_WENT_WRONG');
+    }
+    // Triggers `onSubscriptionPlanChanged` event.
+    await this.eventEmitter.emitAsync(
+      events.subscription.onSubscriptionPlanChange,
+      {
+        lemonSubscriptionId,
+        newVariantId,
+      } as IOrganizationSubscriptionChanged,
+    );
+  }
+}