Feat: Product Lifecycle Notification System

[niyibi250]

Description:

As a user, I want to receive notifications about changes in the status of my products, so that I am always informed and can take appropriate action when needed.

task functionality:

• listen for change in product life cycle
• Email Notifications
• In-app Notifications
• Testing
• Documentation

Acceptance Criteria:

1. Lifecycle Changes Covered:

• Product added: A new product is added to the user's inventory.
• Product removed: A product is removed from the user's inventory.
• Product expired: A product has expired and is no longer available.
• Product bought: A product is purchased by a customer.
• Product shipped: A purchased product has been shipped.
• Product delivered: A shipped product has been delivered to the customer.

2. Notification Types:

• Email Notification: An email is sent to the user informing them of the lifecycle change.
• In-app Notification: A notification is displayed within the application informing the user of the lifecycle change.

3. Notification Triggers:

Notifications are triggered by specific events in the product lifecycle.
Utilize Node.js events to listen for these lifecycle changes and trigger notifications.

4. Notification Delivery:

Ensure notifications are delivered both in-app and via email to the user.
Include relevant details in the notifications (e.g., product name, status change, date/time of the change).

5. Timing and Frequency:

Implement cron jobs to regularly check for product lifecycle changes.
Notifications should be sent promptly after detecting a lifecycle change.

Dev Notes:

**Cron Jobs: **

Use cron jobs to periodically check the database for any changes in the product lifecycle.
Schedule these cron jobs to run at appropriate intervals (e.g., every minute, every hour) to ensure timely notifications.

Node.js Event Listeners:

Implement Node.js event listeners to detect changes in the product lifecycle.
Define events for each type of lifecycle change (e.g., productAdded, productRemoved, productExpired, productBought, productShipped, productDelivered).

Email Notification System:

Use a same email-send as one used to send email notifications for password recovery.
Design email templates for each type of notification with clear and concise information.

In-app Notification System:

Implement an in-app notification system to display notifications within the user notification box.
Ensure notifications are easily accessible and visible to users.

Database Schema:

Update the database schema to include fields for tracking product status and lifecycle events.
Maintain a log of lifecycle changes for audit purposes and historical reference.

Example Scenarios:

Scenario: Product Added

• Given a user adds a new product to their inventory,
• Then an email notification is sent to the user informing them of the new addition,
• And an in-app notification is displayed with details of the added product