Major refactoring of listing/router/model relation

- updated Subscribers listing
- udpated Segments listing
- added Forms router

lib/Router/Forms.php

@@ -0,0 +1,95 @@
+<?php
+namespace MailPoet\Router;
+use \MailPoet\Models\Form;
+use \MailPoet\Listing;
+
+if(!defined('ABSPATH')) exit;
+
+class Forms {
+  function __construct() {
+  }
+
+  function get($data = array()) {
+    $id = (isset($data['id']) ? (int)$data['id'] : 0);
+
+    $form = Form::findOne($id);
+    if($form === false) {
+      wp_send_json(false);
+    } else {
+      wp_send_json($form->asArray());
+    }
+  }
+
+  function listing($data = array()) {
+    $listing = new Listing\Handler(
+      '\MailPoet\Models\Form',
+      $data
+    );
+
+    $listing_data = $listing->get();
+
+    wp_send_json($listing_data);
+  }
+
+  function getAll() {
+    $collection = Form::findArray();
+    wp_send_json($collection);
+  }
+
+  function save($data = array()) {
+    $result = Form::createOrUpdate($data);
+
+    if($result !== true) {
+      wp_send_json($result);
+    } else {
+      wp_send_json(true);
+    }
+  }
+
+  function restore($id) {
+    $form = Form::findOne($id);
+    if($form !== false) {
+      $form->set_expr('deleted_at', 'NULL');
+      $result = $form->save();
+    } else {
+      $result = false;
+    }
+    wp_send_json($result);
+  }
+
+  function delete($data = array()) {
+    $form = Form::findOne($data['id']);
+    $confirm_delete = filter_var($data['confirm'], FILTER_VALIDATE_BOOLEAN);
+    if($form !== false) {
+      if($confirm_delete) {
+        $form->delete();
+        $result = true;
+      } else {
+        $form->set_expr('deleted_at', 'NOW()');
+        $result = $form->save();
+      }
+    } else {
+      $result = false;
+    }
+    wp_send_json($result);
+  }
+
+  function duplicate($id) {
+    $result = false;
+
+    $form = Form::duplicate($id);
+    if($form !== false) {
+      $result = $form;
+    }
+    wp_send_json($result);
+  }
+
+  function bulk_action($data = array()) {
+    $bulk_action = new Listing\BulkAction(
+      '\MailPoet\Models\Form',
+      $data
+    );
+
+    wp_send_json($bulk_action->apply());
+  }
+}