Included: alert the active user someone is waiting for the item

app/Http/Controllers/AlertController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers;
 
 use \App\User;
+use \App\Mail\UserWaiting;
 use Illuminate\Http\Request;
 
 class AlertController extends Controller
@@ -13,6 +14,13 @@ class AlertController extends Controller
         $item->waiting_user_id = \Auth::id();
         $item->timestamps = false;
         $item->save();
+
+        $loggedUser = \Auth::user()->name;
+        $userWithItem = User::find($item->used_by);
+        \Mail::to($userWithItem)->send(
+            new UserWaiting($loggedUser, $userWithItem->name, $item)
+        );
+
         return redirect('home');
     }
 

app/Mail/UserWaiting.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Mail;
+
+use \App\Item;
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Contracts\Queue\ShouldQueue;
+
+class UserWaiting extends Mailable
+{
+    public $item;
+    public $waitingUser;
+    public $userWithItem; 
+    use Queueable, SerializesModels;
+
+    /**
+     * Create a new message instance.
+     *
+     * @return void
+     */
+    public function __construct($waitingUser, $userWithItem, Item $item)
+    {
+        $this->item = $item;
+        $this->waitingUser = $waitingUser;
+        $this->userWithItem = $userWithItem;
+    }
+
+    /**
+     * Build the message.
+     *
+     * @return $this
+     */
+    public function build()
+    {
+        return $this->subject($this->waitingUser . ' wants to use ' . $this->item->name)
+            ->markdown('emails.userWaiting');
+    }
+}

resources/views/emails/userWaiting.blade.php

@@ -0,0 +1,16 @@
+@component('mail::message')
+Hello, {{$userWithItem}},
+
+Are you still using {{$item->name}}?
+
+We just want to let you know that {{$waitingUser}} asked us to be alerted when this item were available.
+
+So, if you are not using it anymore, please go to our site and...
+
+@component('mail::button', ['url' => 'https://shareit.brunofontes.net/home'])
+Return it!
+@endcomponent
+
+Thanks,<br>
+{{ config('app.name') }}
+@endcomponent