Support adding to dynamically (#17)

* support setting recipient dynamically

* wip

README.md

@@ -131,6 +131,26 @@ You can also modify who the notification(SMS) is sent from, this will overide th
                     ->from("set any sender id/name here");
 ```
 
+You can also modify who the notification(SMS) is sent to (the recipient)
+
+``` php
+        return (new AfricasTalkingMessage())
+                    ->content('Your SMS message content')
+                    ->to("put the recipient phonenumber here"); //eg ->to(1111111111)
+```
+It's important to know the Order in which the recipient phone number the notification(SMS) will be sent to will be used
+
+1) If you have defined the routeNotificationForAfricasTalking() method on the Notifiable class (User.php in this case) and returned a valid phone number, then that will be used.
+
+2) if you did not define routeNotificationForAfricasTalking() method on the Notifiable class (User.php in this case), then the phone attribute of the User will be used ($user->phone)
+
+3) Lastly if 1 and 2 are not set, then you can set the recipient phone number using ->to(19283281921)
+
+``` php
+        return (new AfricasTalkingMessage())
+                    ->content('Your SMS message content')
+                    ->to("put the recipient phonenumber here");
+```
 
 ## Testing
 

src/AfricasTalkingChannel.php

@@ -2,9 +2,10 @@
 
 namespace NotificationChannels\AfricasTalking;
 
-use AfricasTalking\SDK\AfricasTalking as AfricasTalkingSDK;
 use Exception;
 use Illuminate\Notifications\Notification;
+use AfricasTalking\SDK\AfricasTalking as AfricasTalkingSDK;
+use NotificationChannels\AfricasTalking\Exceptions\InvalidPhonenumber;
 use NotificationChannels\AfricasTalking\Exceptions\CouldNotSendNotification;
 
 class AfricasTalkingChannel
@@ -30,7 +31,11 @@ public function send($notifiable, Notification $notification)
         $message = $notification->toAfricasTalking($notifiable);
 
         if (!$phoneNumber = $notifiable->routeNotificationFor('africasTalking')) {
-            $phoneNumber = $notifiable->phone_number;
+            $phoneNumber = $notifiable->phone_number ?? $message->getTo();
+        }
+
+        if(empty($phoneNumber)) {
+            throw InvalidPhonenumber::configurationNotSet();
         }
 
         if (empty(($message->getSender())) || is_null($message->getSender())) {
@@ -47,7 +52,7 @@ public function send($notifiable, Notification $notification)
         }
 
         try {
-            $this->africasTalking->sms()->send($params);
+            return $this->africasTalking->sms()->send($params);
         } catch (Exception $e) {
             throw CouldNotSendNotification::serviceRespondedWithAnError($e->getMessage());
         }

src/AfricasTalkingMessage.php

@@ -10,6 +10,9 @@ class AfricasTalkingMessage
     /** @var string|null */
     protected $from;
 
+    /** @var string|null */
+    protected $to;
+
     /**
      * Set content for this message.
      *
@@ -36,6 +39,19 @@ public function from(string $from): self
         return $this;
     }
 
+     /**
+     * Set recipient for this message.
+     *
+     * @param string $from
+     * @return self
+     */
+    public function to(string $to): self
+    {
+        $this->to = trim($to);
+
+        return $this;
+    }
+
     /**
      * Get message content.
      *
@@ -55,4 +71,14 @@ public function getSender()
     {
         return $this->from ?? config('services.africastalking.from');
     }
+
+    /**
+     * Get recipient info.
+     *
+     * @return string
+     */
+    public function getTo()
+    {
+        return $this->to ?? null;
+    }
 }

src/Exceptions/InvalidPhonenumber.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace NotificationChannels\AfricasTalking\Exceptions;
+
+use Exception;
+
+class InvalidPhonenumber extends Exception
+{
+    public static function configurationNotSet(): self
+    {
+        return new static(
+            "please provide a phonenumber to which the notification(SMS) will be sent to, you can do these in three ways: 
+            1) by defining a routeNotificationForAfricasTalking method on your notifiable entity
+             or
+            2) by creating a new column called `phone` in your notifiable table
+            3) by chaining from(phonenumber) method to your AfricasTalkingMessage() eg (new AfricasTalkingMessage())
+              ->content('Your SMS message content')->to(11111111); method in your event class 
+            "
+        );
+    }
+}