Moved the response operations into their own namespace 'Processors' and bundled up the appointments GET request.

src/application/controllers/api/v1/Appointments.php

@@ -13,6 +13,9 @@
 
 require_once __DIR__ . '/API_V1_Controller.php';
 
+use \EA\Engine\Api\V1\Response;
+use \EA\Engine\Types\NonEmptyString; 
+
 /**
  * Appointments Controller
  *
@@ -20,28 +23,39 @@ require_once __DIR__ . '/API_V1_Controller.php';
  * @subpackage API
  */
 class Appointments extends API_V1_Controller {
+    /**
+     * Appointments Resource Formatter
+     * 
+     * @var \EA\Engine\Api\V1\Formatters\Appointments
+     */
+    protected $formatter; 
+
     /**
      * Class Constructor
      */
     public function __construct() {
         parent::__construct();
+        $this->load->model('appointments_model');
+        $this->formatter = new \EA\Engine\Api\V1\Formatters\Appointments;
     }
 
     /**
      * GET API Method 
      * 
      * @param int $id Optional (null), the record ID to be returned.
-     * 
-     * @return \EA\Engine\Api\V1\Response Returns data response. 
      */
     public function get($id = null) {
+        $appointments = $this->appointments_model->get_batch(); 
 
+        $response = new Response($appointments); 
+
+        $status = new NonEmptyString('200 OK');
+
+        $response->format($this->formatter)->search()->sort()->paginate()->minimize()->output();
     }
 
     /**
      * POST API Method 
-     * 
-     * @return @return \EA\Engine\Api\V1\Response Returns data response. 
      */
     public function post() {
         
@@ -51,8 +65,6 @@ class Appointments extends API_V1_Controller {
      * PUT API Method 
      *
      * @param int $id The record ID to be updated.
-     * 
-     * @return @return \EA\Engine\Api\V1\Response Returns data response. 
      */
     public function put($id) {
 
@@ -62,8 +74,6 @@ class Appointments extends API_V1_Controller {
      * DELETE API Method 
      *
      * @param int $id The record ID to be deleted.
-     * 
-     * @return @return \EA\Engine\Api\V1\Response Returns data response. 
      */
     public function delete($id) {
 

src/engine/Api/V1/Formatters/Appointments.php

@@ -0,0 +1,37 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Api\V1\Formatters; 
+
+class Appointments implements FormattersInterface {
+    public function format(array &$response) {
+        $temporaryResponse = []; 
+
+        foreach ($response as $entry) {
+            $temporaryResponse[] = [
+                'id' => $entry['id'],
+                'book' => $entry['book_datetime'],
+                'start' => $entry['start_datetime'],
+                'end' => $entry['end_datetime'],
+                'hash' => $entry['hash'],
+                'notes' => $entry['notes'],
+                'customerId' => $entry['id_users_customer'],
+                'providerId' => $entry['id_users_provider'],
+                'serviceId' => $entry['id_services'],
+                'googleCalendarId' => $entry['id_google_calendar']
+            ];
+        }
+
+        $response = $temporaryResponse; 
+    }
+}

src/engine/Api/V1/Formatters/FormattersInterface.php

@@ -11,8 +11,8 @@
  * @since       v1.2.0
  * ---------------------------------------------------------------------------- */
 
-namespace \EA\Engine\Api\V1; 
-
-class Response {
+namespace EA\Engine\Api\V1\Formatters;
 
+interface FormattersInterface {
+    public function format(array &$response);
 } 

src/engine/Api/V1/Processors/Filter.php

@@ -0,0 +1,21 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Api\V1\Processors; 
+
+class Filter implements ProcessorsInterface {
+ {
+    public static function process(array $response) {
+        
+    }
+}

src/engine/Api/V1/Processors/Minimize.php

@@ -11,8 +11,10 @@
  * @since       v1.2.0
  * ---------------------------------------------------------------------------- */
 
-namespace \EA\Engine\Api\V1; 
+namespace EA\Engine\Api\V1\Processors; 
 
-class Pagination {
+class Minimize implements ProcessorsInterface {
+    public static function process(array $response) {
         
     }
+}

src/engine/Api/V1/Processors/Paginate.php

@@ -0,0 +1,20 @@
+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Api\V1\Processors; 
+
+class Paginate implements ProcessorsInterface {
+    public static function process(array $response) {
+        
+    }
+}

src/engine/Api/V1/Processors/ProcessorsInterface.php

@@ -11,8 +11,8 @@
  * @since       v1.2.0
  * ---------------------------------------------------------------------------- */
 
-namespace \EA\Engine\Api\V1; 
-
-class Response {
+namespace EA\Engine\Api\V1\Processors;
 
+interface ProcessorsInterface {
+    public static function process(array $response);
 } 

src/engine/Api/V1/Processors/Search.php

@@ -11,8 +11,10 @@
  * @since       v1.2.0
  * ---------------------------------------------------------------------------- */
 
-namespace \EA\Engine\Api\V1; 
+namespace EA\Engine\Api\V1\Processors; 
 
-class Response {
+class Search implements ProcessorsInterface {
+    public static function process(array $response) {
         
     }
+}

src/engine/Api/V1/Processors/Sort.php

@@ -11,8 +11,10 @@
  * @since       v1.2.0
  * ---------------------------------------------------------------------------- */
 
-namespace \EA\Engine\Api\V1; 
+namespace EA\Engine\Api\V1\Processors; 
 
-class Response {
+class Sort implements ProcessorsInterface {
+    public static function process(array $response) {
         
     }
+}

src/engine/Api/V1/Response.php

@@ -11,8 +11,108 @@
  * @since       v1.2.0
  * ---------------------------------------------------------------------------- */
 
-namespace \EA\Engine\Api\V1; 
+namespace EA\Engine\Api\V1; 
 
+/**
+ * API v1 Response 
+ *
+ * Use chain-calls of the class methods to easily manipulate the provided response array. This class will
+ * use directly the provided GET parameters for easier manipulation.
+ *
+ * Example:
+ *   $formatter = new \EA\Engine\Api\V1\Formatters\Appointments;
+ *   $response = new \EA\Engine\Api\V1\Response($data);
+ *   $response->format($formatter)->search()->sort()->paginate()->minimize()->output();
+ */
 class Response {
+    /**
+     * Contains the response information. 
+     * 
+     * @var array
+     */
+    protected $response;
 
+    /**
+     * Class Constructor 
+     * 
+     * @param array $response Provide unfiltered data to be processed as an array. 
+     */
+    public function __construct(array $response) {
+        $this->response = $response;
+    }
+
+    /**
+     * Format the response entries to the API compatible structure. 
+     * 
+     * @param \Formatters\FormattersInterface $formatter Provide the corresponding formatter class. 
+     *
+     * @return \EA\Engine\Api\V1\Response
+     */
+    public function format(Formatters\FormattersInterface $formatter) {
+        $formatter->format($this->response);
+
+        return $this;
+    }
+
+    /**
+     * Perform a response search. 
+     * 
+     * @return \EA\Engine\Api\V1\Response
+     */
+    public function search() {
+        Processors\Search::process($this->response); 
+
+        return $this;
+    }
+
+    /**
+     * Perform a response sort. 
+     *
+     * @return \EA\Engine\Api\V1\Response
+     */
+    public function sort() {
+        Processors\Sort::process($this->response); 
+
+        return $this;
+    }
+
+    /**
+     * Perform a response paginate. 
+     *
+     * @return \EA\Engine\Api\V1\Response
+     */
+    public function paginate() {
+        Processors\Paginate::process($this->response); 
+
+        return $this;
+    }
+
+    /**
+     * Perform a response minimize. 
+     *
+     * @return \EA\Engine\Api\V1\Response
+     */
+    public function minimize() {
+        Processors\Minimize::process($this->response);
+
+        return $this;
+    }
+
+    /**
+     * Output the response as a JSON with the provided status header. 
+     *
+     * @param \EA\Engine\Types\NonEmptyString $status Optional (null), if provided it must contain the status  
+     * header value. Default string: '200 OK'.
+     *
+     * @return \EA\Engine\Api\V1\Response
+     */
+    public function output(NonEmptyString $status = null) {
+        $header = $status ? $status->get() : '200 OK'; 
+
+        header('HTTP/1.0 ' . $header); 
+
+        echo json_encode($this->response, JSON_UNESCAPED_SLASHES|JSON_PRETTY_PRINT);
+
+        return $this;
+    }
 }

test/php/engine/Api/V1/fixtures/appointment.json

@@ -1,9 +1,9 @@
 {
     "id": 1, 
-    "hash": "asdf809a8sdf987a9d8f7", 
     "book": "2016-07-08 12:57:00", 
     "start": "2016-07-08 18:00:00", 
     "end": "2016-07-08 18:30:00", 
+    "hash": "asdf809a8sdf987a9d8f7", 
     "notes": "These are some test notes.",
     "customerId": 56,
     "providerId": 4,