Repository: khamis1992/rental-solutions-28bf4163
Pull request #53: Add internal event bus
Author: login: khamis1992
Labels: name: codex
Created: 2025-05-18T15:55:32Z | Merged: 2025-05-18T15:56:37Z

## Summary
- implement simple event bus
- define payment events
- emit event after recording a payment
- update agreements via event handler
- register the handler during app startup

## Testing
- `npx tsc --noEmit`
- `npm run lint` *(fails: Cannot find package '@eslint/js')*

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Introduced an event-driven system to automatically update lease payment dates when a payment is recorded.
  - Payment recording now triggers real-time updates to related lease information.
- **Chores**
  - Improved application initialization to enable automatic event handling for payment updates.
<!-- end of auto-generated comment: release notes by coderabbit.ai --> 
 <div id='description'>
<h3>Summary by Bito</h3>
This pull request introduces a new internal event bus system to streamline event-driven communication across the application. It adds payment event definitions and interfaces, implements a basic event bus for subscribing, publishing, and unsubscribing to events, and modifies the PaymentService to emit events upon successful payment recording.
<br>
<br>
<b>Unit tests added</b>: False
<br>
<br>
<b>Estimated effort to review (1-5, lower is better)</b>: 2
</div>


Diff:
diff --git a/src/events/index.ts b/src/events/index.ts
new file mode 100644
index 000000000..bb050c5e7
--- /dev/null
+++ b/src/events/index.ts
@@ -0,0 +1,11 @@
+export const Events = {
+  PaymentRecorded: 'payment.recorded'
+} as const;
+
+export type EventName = (typeof Events)[keyof typeof Events];
+
+export interface PaymentRecordedPayload {
+  paymentId: string;
+  agreementId: string;
+  amount: number;
+}
diff --git a/src/events/payment-handlers.ts b/src/events/payment-handlers.ts
new file mode 100644
index 000000000..40f77bd1f
--- /dev/null
+++ b/src/events/payment-handlers.ts
@@ -0,0 +1,15 @@
+import { eventBus } from '@/lib/event-bus';
+import { supabase } from '@/lib/supabase';
+import { Events, PaymentRecordedPayload } from './index';
+
+export function registerPaymentEventHandlers() {
+  eventBus.subscribe<PaymentRecordedPayload>(
+    Events.PaymentRecorded,
+    async (payload) => {
+      await supabase
+        .from('leases')
+        .update({ last_payment_date: new Date().toISOString() })
+        .eq('id', payload.agreementId);
+    }
+  );
+}
diff --git a/src/lib/event-bus.ts b/src/lib/event-bus.ts
new file mode 100644
index 000000000..6ab0a7bbf
--- /dev/null
+++ b/src/lib/event-bus.ts
@@ -0,0 +1,30 @@
+export type EventHandler<T> = (payload: T) => void;
+
+class EventBus {
+  private handlers = new Map<string, EventHandler<any>[]>();
+
+  subscribe<T>(event: string, handler: EventHandler<T>): () => void {
+    const existing = this.handlers.get(event) || [];
+    existing.push(handler as EventHandler<any>);
+    this.handlers.set(event, existing);
+    return () => this.unsubscribe(event, handler);
+  }
+
+  publish<T>(event: string, payload: T): void {
+    const handlers = this.handlers.get(event);
+    if (!handlers) return;
+    handlers.forEach(h => h(payload));
+  }
+
+  unsubscribe<T>(event: string, handler: EventHandler<T>): void {
+    const handlers = this.handlers.get(event);
+    if (!handlers) return;
+    const index = handlers.indexOf(handler as EventHandler<any>);
+    if (index >= 0) {
+      handlers.splice(index, 1);
+    }
+  }
+}
+
+export const eventBus = new EventBus();
+export default EventBus;
diff --git a/src/services/PaymentService.ts b/src/services/PaymentService.ts
index fc7a6eea2..8b85f79fa 100644
--- a/src/services/PaymentService.ts
+++ b/src/services/PaymentService.ts
@@ -1,5 +1,7 @@
 
 import { supabase } from '@/lib/supabase';
+import { eventBus } from '@/lib/event-bus';
+import { Events, PaymentRecordedPayload } from '@/events';
 import { castDbId } from '@/utils/supabase-type-helpers';
 import { BaseService } from './base/BaseService';
 import { Payment, PaymentInsert, SpecialPaymentOptions } from '@/types/payment.types';
@@ -20,7 +22,16 @@ export class PaymentService extends BaseService {
       if (error) {
         return this.handleError(error, 'Failed to record payment');
       }
-      
+
+      if (data) {
+        const payload: PaymentRecordedPayload = {
+          paymentId: data.id,
+          agreementId: data.lease_id,
+          amount: data.amount_paid ?? data.amount
+        };
+        eventBus.publish(Events.PaymentRecorded, payload);
+      }
+
       return this.success(data);
     } catch (error) {
       return this.handleError(error, 'An unexpected error occurred recording payment');
diff --git a/src/utils/app-initializer.ts b/src/utils/app-initializer.ts
index a21abe6f5..24d5c0173 100644
--- a/src/utils/app-initializer.ts
+++ b/src/utils/app-initializer.ts
@@ -3,11 +3,13 @@ import { setupInvoiceTemplatesTable } from "./setupInvoiceTemplates";
 import { supabase } from '@/lib/supabase';
 import { toast } from 'sonner';
 import { getSystemServicesStatus } from './service-availability';
+import { registerPaymentEventHandlers } from '@/events/payment-handlers';
 
 // Initialize services check status flag
 let servicesChecked = false;
 
 export const initializeApp = async () => {
+  registerPaymentEventHandlers();
   // Set up database tables and other requirements
   await setupInvoiceTemplatesTable();
   


Reviews:
user: login: bito-code-review[bot]
body: <div>
<h3>Code Review Agent Run #9866bf</h3>

<div>
<details>
<summary>
<b>Actionable Suggestions -  2</b>
</summary>

<ul>

<li>
<div id="suggestion">
src/lib/event-bus.ts - <b>1</b>

<ul>
<li>Modifying and resetting retrieved array reference · <a href ="https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#r2094564941">Line 6-11</a></li>
</ul>

</div>
</li>

<li>
<div id="suggestion">
src/services/PaymentService.ts - <b>1</b>

<ul>
<li>Nullish coalescing may not handle zero values · <a href ="https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#r2094564942">Line 30-30</a></li>
</ul>

</div>
</li>

</ul>

</details>
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<b>Review Details</b>
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<li>
<div id="file_reviewed">
Files reviewed - <b>5</b> · Commit Range: <code>ef0f5f7..ef0f5f7</code>
<ul>
<li>src/events/index.ts</li><li>src/events/payment-handlers.ts</li><li>src/lib/event-bus.ts</li><li>src/services/PaymentService.ts</li><li>src/utils/app-initializer.ts</li>
</ul>
</div>
</li>

<li>
<div id="file_skipped">
Files skipped - <b>0</b>
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</ul>
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state: CHANGES_REQUESTED
author_association: NONE
submitted_at: 2025-05-18T15:59:10Z

Review comments:
diff_hunk: @@ -0,0 +1,30 @@
+export type EventHandler<T> = (payload: T) => void;
+
+class EventBus {
+  private handlers = new Map<string, EventHandler<any>[]>();
+
+  subscribe<T>(event: string, handler: EventHandler<T>): () => void {
+    const existing = this.handlers.get(event) || [];
+    existing.push(handler as EventHandler<any>);
+    this.handlers.set(event, existing);
+    return () => this.unsubscribe(event, handler);
+  }
path: src/lib/event-bus.ts
user: login: bito-code-review[bot]
body: 
<div>


<div id="suggestion">
<div id="issue"><b>Modifying and resetting retrieved array reference</b></div>
<div id="fix">

The `subscribe` method modifies the array returned by `get()` and then sets it back, which could lead to unexpected behavior if the same array is referenced elsewhere. Create a new array instead of modifying the existing one.
</div>
<details>
<summary>
<b>Code suggestion</b>
</summary>
<blockquote>Check the AI-generated fix before applying</blockquote>
<div id="code">


```suggestion
  subscribe<T>(event: string, handler: EventHandler<T>): () => void {
    const handlers = [...(this.handlers.get(event) || [])];
    handlers.push(handler as EventHandler<any>);
    this.handlers.set(event, handlers);
    return () => this.unsubscribe(event, handler);
  }
```

</div>
</details>
</div>


<small><i>Code Review Run <a href=https://github.com/khamis1992/rental-solutions-28bf4163/pull/53#issuecomment-2889068003>#9866bf</a></i></small>
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Should Bito avoid suggestions like this for future reviews? (<a href=https://alpha.bito.ai/home/ai-agents/review-rules>Manage Rules</a>)
- [ ] Yes, avoid them
created_at: 2025-05-18T15:59:10Z
author_association: NONE
diff_hunk: @@ -20,7 +22,16 @@ export class PaymentService extends BaseService {
       if (error) {
         return this.handleError(error, 'Failed to record payment');
       }
-      
+
+      if (data) {
+        const payload: PaymentRecordedPayload = {
+          paymentId: data.id,
+          agreementId: data.lease_id,
+          amount: data.amount_paid ?? data.amount
path: src/services/PaymentService.ts
user: login: bito-code-review[bot]
body: 
<div>


<div id="suggestion">
<div id="issue"><b>Nullish coalescing may not handle zero values</b></div>
<div id="fix">

The amount fallback logic `data.amount_paid ?? data.amount` may lead to incorrect behavior if `amount_paid` is 0, as 0 is falsy in JavaScript. Consider using `data.amount_paid !== undefined ? data.amount_paid : data.amount` instead.
</div>
<details>
<summary>
<b>Code suggestion</b>
</summary>
<blockquote>Check the AI-generated fix before applying</blockquote>
<div id="code">


```suggestion
          amount: data.amount_paid !== undefined ? data.amount_paid : data.amount
```

</div>
</details>
</div>


<small><i>Code Review Run <a href=https://github.com/khamis1992/rental-solutions-28bf4163/pull/53#issuecomment-2889068003>#9866bf</a></i></small>
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Should Bito avoid suggestions like this for future reviews? (<a href=https://alpha.bito.ai/home/ai-agents/review-rules>Manage Rules</a>)
- [ ] Yes, avoid them
created_at: 2025-05-18T15:59:10Z
author_association: NONE

PR comments:
user: login: coderabbitai[bot]
created_at: 2025-05-18T15:55:39Z
body: <!-- This is an auto-generated comment: summarize by coderabbit.ai -->
<!-- This is an auto-generated comment: failure by coderabbit.ai -->

> [!CAUTION]
> ## Review failed
> 
> The pull request is closed.

<!-- end of auto-generated comment: failure by coderabbit.ai -->
<!-- walkthrough_start -->

"""
## Walkthrough

A new event-driven mechanism is introduced for payment processing. Event types and payloads are formalized, an event bus class is implemented, and payment event handlers are registered during application initialization. The payment service now emits events after recording payments, and a handler updates lease records in response to these events.

## Changes

| File(s)                                         | Change Summary |
|-------------------------------------------------|---------------|
| `src/events/index.ts`                           | Introduced event constants, event name type, and `PaymentRecordedPayload` interface for payment events. |
| `src/events/payment-handlers.ts`                | Added function to register payment event handlers, specifically handling `PaymentRecorded` events to update lease records. |
| `src/lib/event-bus.ts`                          | Implemented a generic `EventBus` class with subscribe, publish, and unsubscribe methods; exported an instance and handler type. |
| `src/services/PaymentService.ts`                | Modified `recordPayment` to publish a `PaymentRecorded` event after successful payment insertion. |
| `src/utils/app-initializer.ts`                  | Registered payment event handlers during application initialization by invoking the new registration function. |

## Sequence Diagram(s)

```mermaid
sequenceDiagram
    participant Client
    participant PaymentService
    participant EventBus
    participant PaymentHandler
    participant Supabase

    Client->>PaymentService: recordPayment(paymentData)
    PaymentService->>Supabase: Insert payment record
    Supabase-->>PaymentService: Confirmation (success)
    PaymentService->>EventBus: publish('payment.recorded', payload)
    EventBus->>PaymentHandler: Invoke handler with payload
    PaymentHandler->>Supabase: Update leases.last_payment_date
```

## Poem

> 🐇  
> A hop, a skip, an event on the breeze,  
> Payments recorded with elegant ease.  
> The event bus now scurries, handlers awake,  
> Leases refreshed for every payment we make.  
> With paws on the code and whiskers in air,  
> The system’s more lively—rabbits everywhere!  
>
"""

<!-- walkthrough_end -->
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<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between 923d1cf2136c6fe6e06d2bd7c607ab0d2b876822 and ef0f5f74501b177622416db8c93029c89a5bac44.

</details>

<details>
<summary>📒 Files selected for processing (5)</summary>

* `src/events/index.ts` (1 hunks)
* `src/events/payment-handlers.ts` (1 hunks)
* `src/lib/event-bus.ts` (1 hunks)
* `src/services/PaymentService.ts` (2 hunks)
* `src/utils/app-initializer.ts` (1 hunks)

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created_at: 2025-05-18T15:59:08Z
body: <div>
<h2>Changelist by <a href="https://bito.ai">Bito</a></h2>
<p>This pull request implements the following key changes.</p>

<div>
<table width="100%">
<tbody>
  <tr>
    <th>Key Change</th>
    <th>Files Impacted</th>
  </tr>

<tr>
<td width="30%">
    <b>New Feature</b> - Introduction of Event-Based Communication
</td>
<td width="70%">


<div>

-&nbsp;[`index.ts`](https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#diff-341c2849e1a49b7d672044ce88ba73f2196eb326877a2fc4fad3e45bd56a2964) - Defines new payment events and types to support event-based communication.
<div>

-&nbsp;[`payment-handlers.ts`](https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#diff-7eccca79f97128a72de0d106025288a13b7c80a01f50c9a16b8793f6a3d8a180) - Registers event handlers for processing payment events.
<div>

-&nbsp;[`event-bus.ts`](https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#diff-bc0bd952be57353151a86396cf67166094b7e892e7a80a888f4d45aae8c94346) - Implements a basic event bus with subscribe, publish, and unsubscribe methods.
<div>

-&nbsp;[`PaymentService.ts`](https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#diff-fe440faa4b7937d69b1b243f287ab7d5c0e88955cd30eab76ca7baa153dd25ef) - Integrates event emission after recording a payment to notify subscribers.
<div>

-&nbsp;[`app-initializer.ts`](https://github.com/khamis1992/rental-solutions-28bf4163/pull/53/files#diff-03dd2753708aa93b265fd28b2300a62cc8208a2c047930751c025ef03a1a2e58) - Registers the payment event handler during application startup.
</div>
</td>
</tr>

</tbody>
</table>
</div>
</div>
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