skeleton commit; based on an anom project

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diff --git a/public/app/views/components/footer.php b/public/app/views/components/footer.php
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+<?php 
+
+use app\extends\Cache_service;
+
+
+/** DESIGNERS
+ * -----------------------------------------------------------------------------
+ * 
+ * structures that combine several design information
+ * in a json structrure and parses inta a quite complicated view;
+ * 
+ * co-operate with pages
+ * 
+ * can be used to rended menus, sections like header or footer etc;
+ * 
+ * TODO:
+ * + embed it as a core \Render method
+ * + dynamic designers 
+ * + recursive designers
+ * 
+ * Here we implement a simplified version of the consept
+ * where entities shall always be `pages`
+ *
+ * 
+ * PARAMETRES
+ * --- -- -- - - -
+ *  
+ * primary properties of designer structure are 2 properties
+ * 
+ * @var class (string): container class name
+ * @var struct (json array): representatoion of the "to-be-designed" structure 
+ * 
+ * TODO: support more complx `class` strings ex. `.container>#footer>row`
+ * 
+ * 
+ * Each sub-structure has 2-5 properties:
+ * 
+ * @var title (string) : title of the sub-section
+ * @var entity (string) : type of entity (ex: page/lesson/etc; TODO: method of CMS_model?)
+ * @var list (array) : list of entity id(s)
+ * @var template (string) : template that is used to draw the listed pages' info
+ * @var width (string) : class that relates to sub-structure's width
+ * 
+ * NOTE:
+ * designer parsing and rendering can be a quite expensive proccess
+ * thus it is strongly recommented to use cached entities
+ * 
+ * 
+ * Example structure:
+ {
+     "class" : "row",           # container class
+     "struct" : [
+         {                      # block 1
+             "title" : "",
+             "entity" : "page",
+             "list" : [2, 1, 3],    # pages to be listed
+             "template" : "list",   # list page titles with link to the pages
+             "width" : "col-md-4"
+         },
+         {
+             "template" : "null",   # list nothing
+             "width" : "col-md-3"
+         },
+         {
+             "entity" : "page",
+             "list" : [4],              # list content of page 4;
+             "template" : "content",    #  set title to page-title
+             "width" : "col-md-5"
+         }
+
+         TODO: (wish)
+         ,{
+            "template": "struct",
+            "struct" : [
+                {
+                    title, entity, list, template, width
+                },
+                ...
+            ]
+         }
+     ]
+ }
+ *
+ * brainstormin: (TODO:)
+ * use some document-describe stucture like the one on the pdfmake js-library
+ * -----------------------------------------------------------------------------
+ */
+
+
+/** check imported variables / data
+ * -----------------------------------------------------------------------------
+ */
+if (!isset($designer)) {
+
+    // default designer (and first case-study)
+    $designer = '{
+        "class" : "row",
+        "struct" : [
+            {
+                "title" : "Πληροφορίες",
+                "entity" : "page",
+                "list" : [2, 1, 3, 4],
+                "template" : "list",
+                "width" : "col-md-4 no-list-mark"
+            },
+            {
+                "entity" : "page",
+                "list" : [6],
+                "template" : "content",
+                "width" : "col-md-3 no-list-mark"
+            },
+            {
+                "entity" : "page",
+                "list" : [5],
+                "template" : "content",
+                "width" : "col-md-5 no-list-mark"
+            }
+        ]
+    }';
+}
+
+// $entity list shall be passed
+// entity link url shall be passed
+
+
+/** templating functions
+ * -----------------------------------------------------------------------------
+ */
+
+/** List template
+ * --- -- -- - - -
+ * 
+ * lists entity titles with links
+ * in a `ul>li` html-structure
+ * 
+ * @param $title
+ * @param $list
+ * @param $container
+ */
+function list_template($title, $list, $container, $entity) {
+
+    $result = '<div class="'. $container .'">
+        <h4>'. $title .'</h4>
+        <ul>';
+
+    foreach($list as $id) {
+
+        if ($entity[$id]['status'] == 1) {      // if entity is published
+            $result .= '
+            <li>
+                <a href="/page/'. $id . '">
+                   ' . $entity[$id]['title'] .'
+                </a>
+            </li>';
+        }
+
+    }
+    return $result . '</ul></div>';
+}
+
+/** content_template
+ * 
+ * lists whole title and content of entity
+ * 
+ * @param $list
+ * @param $container
+ */
+function content_template($list, $container, $entity) {
+
+    $parsedown = new Parsedown();
+
+    $result = '<div class="'. $container .'"><ul>';
+    
+    foreach($list as $id) {
+
+        if ($entity[$id]['status'] == 1) {      // if entity is published
+
+            $result .= '
+            <li>
+                <h4>'. $entity[$id]['title'] .'</h4>
+                <div>'. $parsedown->text($entity[$id]['body']) .'</div>
+            </li>';
+        }
+
+    }
+    return $result .'</ul></div>';
+}
+
+
+/** ready to start the proccessing
+ * -----------------------------------------------------------------------------
+ */
+
+// decode ...
+$parse = json_decode($designer);
+
+/** then start parse-proccessing ...
+ * -----------------------------------------------------------------------------
+ */
+?>
+
+
+
+<div class="<?=$parse->class?>">
+
+    <?php
+        foreach( $parse->struct as $section ) {
+
+            switch ($section->template) {
+
+                case 'list':
+                    echo list_template(
+                        $section->title,
+                        $section->list,
+                        $section->width,
+                        $entity
+                    );
+                    break;
+
+                case 'content':
+                    echo content_template(
+                        $section->list,
+                        $section->width,
+                        $entity
+                    );
+                    break;
+
+                default:    // ex. 'null'
+
+                    echo '<div class="'. $section->width .'">
+                        <h4>'. $section->title.'</h4>
+                    </div>';
+            }
+
+        }
+    ?>
+
+</div>
+
+