# Nurse Connect — Implementation Summary

This document summarizes what was added for the Nurse-to-Nurse connection system and how to run migrations and tests.

## Files added/changed (high level)
- Migrations
  - `database/migrations/2025_12_24_000001_add_blocker_to_user_connections.php`
  - `database/migrations/2025_12_24_000002_add_unique_requester_recipient_index.php`

- Services
  - `app/Services/ConnectionService.php` (send/accept/decline/cancel/remove/block/unblock + bulk statuses)

- Controllers
  - `app/Http/Controllers/Api/ConnectionController.php` (JSON endpoints)

- Requests
  - `app/Http/Requests/SendConnectionRequest.php`
  - `app/Http/Requests/RespondConnectionRequest.php`

- Policies
  - `app/Policies/ConnectionPolicy.php`
  - `app/Providers/AuthServiceProvider.php` (register policy)
  - `app/Providers/AppServiceProvider.php` (ensures auth provider is registered)

- Models
  - `app/Models/UserConnection.php` (fillable updated with `blocker_id`)

- Tests
  - `tests/Feature/ConnectionsTest.php` (lifecycle tests)
  - `tests/Feature/ConnectionsAuthorizationTest.php` (authorization tests)
  - `tests/Feature/ConnectionsRaceTest.php` (duplicate/race test)

- Docs
  - `CONNECT_CONNECTIONS_README.md` (this file)

## Routes
Routes are registered under the authenticated group (existing) and are JSON-friendly. Example endpoints:

- `POST /connections/{user}` → send request
- `POST /connections/{user}/accept` → accept
- `POST /connections/{user}/decline` → decline
- `DELETE /connections/{user}` → remove/cancel
- `POST /connections/{user}/block` → block
- `DELETE /connections/{user}/block` → unblock
- `GET /connections/status?ids[]=...` → bulk status map
- `GET /connections` → my connections
- `GET /connections/requests` → incoming/outgoing pending

## How to run (developer)
1. Install dependencies and update autoload (if required):

```bash
composer dump-autoload
```

2. Run migrations (test & local):

```bash
php artisan migrate
```

3. Run the feature tests for connections:

```bash
php artisan test --filter ConnectionsTest
php artisan test --filter ConnectionsAuthorizationTest
php artisan test --filter ConnectionsRaceTest
```

All tests for connections should pass.

## Notes on decisions
- Single table `user_connections` stores the relationship states and `blocker_id` when blocked.
- Unique constraint added on `(requester_id, recipient_id)` to avoid duplicate identical requests.
- If user B already has a pending request to A and A sends to B, the system automatically accepts (becomes `accepted`).
- Decline currently does not implement a re-request cooldown (immediate re-request allowed). This can be added if required.
- All writes are wrapped in transactions and the service uses `lockForUpdate` to avoid races. QueryException handling is in place to handle unique-constraint races.

If you'd like, I can now:
- Add more granular FormRequests (validation rules),
- Add policy unit tests (if you want more coverage), or
- Prepare a small PR with a summary for review.