adding #3

src/Repositories/PaginationRepositoryAbstract.php

@@ -0,0 +1,179 @@
+<?php
+
+namespace SuperGear\Directus\Repositories;
+
+/**
+ *  class for paginate request
+ *
+ *  @author Björn Hase
+ *  @license http://opensource.org/licenses/MIT The MIT License
+ *  @link https://gitlab.tentakelfabrik.de/super-gear/directus GitHub Repository
+ *
+ */
+abstract class PaginationRepositoryAbstract extends RepositoryAbstract
+{
+    /** current page */
+    protected $page;
+
+    /** limit for request */
+    protected $limit;
+
+    /** max pages */
+    protected $maxPages;
+
+    /** pages that are visible */
+    protected $showPages = 7;
+
+    /**
+     *  setting max pages
+     *
+     *  @param integer
+     *  @param array
+     *
+     */
+    protected function setMaxPages($limit, $results)
+    {
+        $this->maxPages = intval(round($results['meta']['filter_count'] / $limit));
+    }
+
+    /**
+     *  getting offset for request
+     *
+     *  @param integer
+     *  @return integer
+     *
+     */
+    protected function getOffset($page, $limit)
+    {
+        return (($page - 1) * $limit);
+    }
+
+    /**
+     *  get pages that are showing
+     *
+     *  @param integer
+     *  @return array
+     *
+     */
+    protected function getPages($page)
+    {
+        // results
+        $pages = [];
+
+        // count of pages that can be shown
+        $showPages = $this->showPages;
+
+        // get avarage value to show pages
+        $averagePages = $this->showPages / 2;
+
+        // run throw all pages
+        for ($i = 1; $i <= $this->maxPages; $i++) {
+
+            // check if $page has to show
+            $show = false;
+
+            // show always first and last page
+            if ($i === 1 || $i === $this->maxPages) {
+                $show = true;
+            }
+
+            // if showing pages are aviable check if page can be shown
+            if ($show === false && $showPages > 0) {
+
+                // if page from 1 to avarage
+                if (($i <= $averagePages && $page <= $averagePages) ||
+
+                    // if page is less than maxPages
+                   (($i >= ($maxPages - $averagePages)) && $page >= ($maxPages - $averagePages)) ||
+
+                   // put current pages as avarage value
+                   ($i >= ($page - $averagePages) && $i <= ($page + $averagePages))) {
+                    $showPages--;
+                    $show = true;
+                }
+            }
+
+            if ($show) {
+                $pages[] = $i;
+            }
+        }
+
+        return $pages;
+    }
+
+    /**
+     *  if previous is possible
+     *
+     *  @param integer $page
+     *
+     */
+    protected function getPrevious($page)
+    {
+        $result = NULL;
+
+        if ($page > 1) {
+            $result = $page - 1;
+        }
+
+        return $result;
+    }
+
+    /**
+    *  if next is possible
+    *
+    *  @param integer $page
+     *
+     */
+    protected function getNext($page)
+    {
+        $result = NULL;
+
+        if ($page < $this->maxPages) {
+            $result = $page + 1;
+        }
+
+        return $result;
+    }
+
+    /**
+     *  prepare query to get limited items
+     *
+     *  @param integer $page
+     *  @param integer $limit
+     *  @param array $query
+     *
+     */
+    protected function prepare($page, $limit, $query)
+    {
+        // setting page and limit
+        $this->page = $page;
+        $this->limit = $limit;
+
+        return array_merge($query, [
+            'offset' => $this->getOffset($this->page, $this->limit),
+            'limit' => $this->limit,
+            'meta' => 'result_count,filter_count,total_count'
+        ]);
+    }
+
+    /**
+     *  paginate results
+     *
+     *  @param integer $page
+     *  @param integer $limit
+     *  @param array $results
+     *
+     */
+    protected function paginate($results)
+    {
+        $this->setMaxPages($this->limit, $results);
+
+        $results['meta']['current'] = $this->page;
+        $results['meta']['previous'] = $this->getPrevious($this->page);
+        $results['meta']['next'] = $this->getNext($this->page);
+        $results['meta']['pages'] = $this->getPages($this->page);
+        $results['meta']['max_pages'] = $this->maxPages;
+
+        return $results;
+    }
+}