Added page revisions. Fixes #2

app/Repos/PageRepo.php

@@ -1,20 +1,25 @@
 <?php namespace Oxbow\Repos;
 
 
+use Illuminate\Support\Facades\Auth;
 use Illuminate\Support\Str;
 use Oxbow\Page;
+use Oxbow\PageRevision;
 
 class PageRepo
 {
     protected $page;
+    protected $pageRevision;
 
     /**
      * PageRepo constructor.
-     * @param $page
+     * @param Page $page
+     * @param PageRevision $pageRevision
      */
-    public function __construct(Page $page)
+    public function __construct(Page $page, PageRevision $pageRevision)
     {
         $this->page = $page;
+        $this->pageRevision = $pageRevision;
     }
 
     public function idExists($id)
@@ -64,6 +69,68 @@ class PageRepo
         return $query->get();
     }
 
+    /**
+     * Updates a page with any fillable data and saves it into the database.
+     * @param Page $page
+     * @param $book_id
+     * @param $data
+     * @return Page
+     */
+    public function updatePage(Page $page, $book_id, $data)
+    {
+        $page->fill($data);
+        $page->slug = $this->findSuitableSlug($page->name, $book_id, $page->id);
+        $page->text = strip_tags($page->html);
+        $page->updated_by = Auth::user()->id;
+        $page->save();
+        $this->saveRevision($page);
+        return $page;
+    }
+
+    /**
+     * Saves a page revision into the system.
+     * @param Page $page
+     * @return $this
+     */
+    public function saveRevision(Page $page)
+    {
+        $lastRevision = $this->getLastRevision($page);
+        if($lastRevision && ($lastRevision->html === $page->html && $lastRevision->name === $page->name)) {
+            return $page;
+        }
+        $revision = $this->pageRevision->fill($page->toArray());
+        $revision->page_id = $page->id;
+        $revision->created_by = Auth::user()->id;
+        $revision->save();
+        // Clear old revisions
+        if($this->pageRevision->where('page_id', '=', $page->id)->count() > 50) {
+            $this->pageRevision->where('page_id', '=', $page->id)
+                ->orderBy('created_at', 'desc')->skip(50)->take(5)->delete();
+        }
+        return $revision;
+    }
+
+    /**
+     * Gets the most recent revision for a page.
+     * @param Page $page
+     * @return mixed
+     */
+    public function getLastRevision(Page $page)
+    {
+        return $this->pageRevision->where('page_id', '=', $page->id)
+            ->orderBy('created_at', 'desc')->first();
+    }
+
+    /**
+     * Gets a single revision via it's id.
+     * @param $id
+     * @return mixed
+     */
+    public function getRevisionById($id)
+    {
+        return $this->pageRevision->findOrFail($id);
+    }
+
     /**
      * Checks if a slug exists within a book already.
      * @param $slug