Organised activity types and moved most to repos

Repos are generally better since otherwise we end up duplicating
things between front-end and API.

Types moved to by CONST values within a class for better visibilty
of usage and listing of types.

app/Actions/ActivityService.php

@@ -13,9 +13,6 @@ class ActivityService
     protected $user;
     protected $permissionService;
 
-    /**
-     * ActivityService constructor.
-     */
     public function __construct(Activity $activity, PermissionService $permissionService)
     {
         $this->activity = $activity;
@@ -26,23 +23,11 @@ class ActivityService
     /**
      * Add activity data to database.
      */
-    public function add(Entity $entity, string $activityKey, ?int $bookId = null)
+    public function add(Entity $entity, string $type, ?int $bookId = null)
     {
-        $activity = $this->newActivityForUser($activityKey, $bookId);
+        $activity = $this->newActivityForUser($type, $bookId);
         $entity->activity()->save($activity);
-        $this->setNotification($activityKey);
-    }
-
-    /**
-     * Adds a activity history with a message, without binding to a entity.
-     */
-    public function addMessage(string $activityKey, string $message, ?int $bookId = null)
-    {
-        $this->newActivityForUser($activityKey, $bookId)->forceFill([
-            'extra' => $message
-        ])->save();
-
-        $this->setNotification($activityKey);
+        $this->setNotification($type);
     }
 
     /**

app/Actions/ActivityType.php

@@ -0,0 +1,22 @@
+<?php namespace BookStack\Actions;
+
+class ActivityType
+{
+    const PAGE_CREATE = 'page_create';
+    const PAGE_UPDATE = 'page_update';
+    const PAGE_DELETE = 'page_delete';
+    const PAGE_RESTORE = 'page_restore';
+    const PAGE_MOVE = 'page_move';
+    const COMMENTED_ON = 'commented_on';
+    const CHAPTER_CREATE = 'chapter_create';
+    const CHAPTER_UPDATE = 'chapter_update';
+    const CHAPTER_DELETE = 'chapter_delete';
+    const CHAPTER_MOVE = 'chapter_move';
+    const BOOK_CREATE = 'book_create';
+    const BOOK_UPDATE = 'book_update';
+    const BOOK_DELETE = 'book_delete';
+    const BOOK_SORT = 'book_sort';
+    const BOOKSHELF_CREATE = 'bookshelf_create';
+    const BOOKSHELF_UPDATE = 'bookshelf_update';
+    const BOOKSHELF_DELETE = 'bookshelf_delete';
+}

app/Actions/CommentRepo.php

@@ -44,6 +44,7 @@ class CommentRepo
         $comment->parent_id = $parent_id;
 
         $entity->comments()->save($comment);
+        Activity::add($entity, ActivityType::COMMENTED_ON, $entity->book->id);
         return $comment;
     }