Added UI components of page autosaving

@@ -108,6 +108,17 @@ class PageController extends Controller
     }
 
     /**
+     * Get page from an ajax request.
+     * @param $pageId
+     * @return \Illuminate\Http\JsonResponse
+     */
+    public function getPageAjax($pageId)
+    {
+        $page = $this->pageRepo->getById($pageId);
+        return response()->json($page);
+    }
+
+    /**
      * Show the form for editing the specified page.
      * @param $bookSlug
      * @param $pageSlug
@@ -119,6 +130,24 @@ class PageController extends Controller
         $page = $this->pageRepo->getBySlug($pageSlug, $book->id);
         $this->checkOwnablePermission('page-update', $page);
         $this->setPageTitle('Editing Page ' . $page->getShortName());
+        $page->isDraft = false;
+
+        // Check for active editing and drafts
+        $warnings = [];
+        if ($this->pageRepo->isPageEditingActive($page, 60)) {
+            $warnings[] = $this->pageRepo->getPageEditingActiveMessage($page, 60);
+        }
+
+        if ($this->pageRepo->hasUserGotPageDraft($page, $this->currentUser->id)) {
+            $draft = $this->pageRepo->getUserPageDraft($page, $this->currentUser->id);
+            $page->name = $draft->name;
+            $page->html = $draft->html;
+            $page->isDraft = true;
+            $warnings [] = $this->pageRepo->getUserPageDraftMessage($draft);
+        }
+
+        if (count($warnings) > 0) session()->flash('warning', implode("\n", $warnings));
+
         return view('pages/edit', ['page' => $page, 'book' => $book, 'current' => $page]);
     }
 
@@ -155,8 +184,9 @@ class PageController extends Controller
         ]);
         $page = $this->pageRepo->getById($pageId);
         $this->checkOwnablePermission('page-update', $page);
-        $this->pageRepo->saveUpdateDraft($page, $request->only(['name', 'html']));
-        return response()->json(['status' => 'success', 'message' => 'Draft successfully saved']);
+        $draft = $this->pageRepo->saveUpdateDraft($page, $request->only(['name', 'html']));
+        $updateTime = $draft->updated_at->format('H:i');
+        return response()->json(['status' => 'success', 'message' => 'Draft saved at ' . $updateTime]);
     }
 
     /**

@@ -77,6 +77,7 @@ Route::group(['middleware' => 'auth'], function () {
 
     // Ajax routes
     Route::put('/ajax/page/{id}/save-draft', 'PageController@saveUpdateDraft');
+    Route::get('/ajax/page/{id}', 'PageController@getPageAjax');
 
     // Links
     Route::get('/link/{id}', 'PageController@redirectFromLink');

@@ -4,6 +4,7 @@
 use Activity;
 use BookStack\Book;
 use BookStack\Exceptions\NotFoundException;
+use Carbon\Carbon;
 use DOMDocument;
 use Illuminate\Support\Str;
 use BookStack\Page;
@@ -259,11 +260,16 @@ class PageRepo extends EntityRepo
         }
 
         // Update with new details
+        $userId = auth()->user()->id;
         $page->fill($input);
         $page->html = $this->formatHtml($input['html']);
         $page->text = strip_tags($page->html);
-        $page->updated_by = auth()->user()->id;
+        $page->updated_by = $userId;
         $page->save();
+
+        // Remove all update drafts for this user & page.
+        $this->userUpdateDraftsQuery($page, $userId)->delete();
+
         return $page;
     }
 
@@ -318,10 +324,7 @@ class PageRepo extends EntityRepo
     public function saveUpdateDraft(Page $page, $data = [])
     {
         $userId = auth()->user()->id;
-        $drafts = $this->pageRevision->where('created_by', '=', $userId)
-            ->where('type', 'update_draft')
-            ->where('page_id', '=', $page->id)
-            ->orderBy('created_at', 'desc')->get();
+        $drafts = $this->userUpdateDraftsQuery($page, $userId)->get();
 
         if ($drafts->count() > 0) {
             $draft = $drafts->first();
@@ -340,6 +343,107 @@ class PageRepo extends EntityRepo
     }
 
     /**
+     * The base query for getting user update drafts.
+     * @param Page $page
+     * @param $userId
+     * @return mixed
+     */
+    private function userUpdateDraftsQuery(Page $page, $userId)
+    {
+        return $this->pageRevision->where('created_by', '=', $userId)
+            ->where('type', 'update_draft')
+            ->where('page_id', '=', $page->id)
+            ->orderBy('created_at', 'desc');
+    }
+
+    /**
+     * Checks whether a user has a draft version of a particular page or not.
+     * @param Page $page
+     * @param $userId
+     * @return bool
+     */
+    public function hasUserGotPageDraft(Page $page, $userId)
+    {
+        return $this->userUpdateDraftsQuery($page, $userId)->count() > 0;
+    }
+
+    /**
+     * Get the latest updated draft revision for a particular page and user.
+     * @param Page $page
+     * @param $userId
+     * @return mixed
+     */
+    public function getUserPageDraft(Page $page, $userId)
+    {
+        return $this->userUpdateDraftsQuery($page, $userId)->first();
+    }
+
+    /**
+     * Get the notification message that informs the user that they are editing a draft page.
+     * @param PageRevision $draft
+     * @return string
+     */
+    public function getUserPageDraftMessage(PageRevision $draft)
+    {
+        $message = 'You are currently editing a draft that was last saved ' . $draft->updated_at->diffForHumans() . '.';
+        if ($draft->page->updated_at->timestamp > $draft->updated_at->timestamp) {
+            $message .= "\n This page has been updated by since that time. It is recommended that you discard this draft.";
+        }
+        return $message;
+    }
+
+    /**
+     * Check if a page is being actively editing.
+     * Checks for edits since last page updated.
+     * Passing in a minuted range will check for edits
+     * within the last x minutes.
+     * @param Page $page
+     * @param null $minRange
+     * @return bool
+     */
+    public function isPageEditingActive(Page $page, $minRange = null)
+    {
+        $draftSearch = $this->activePageEditingQuery($page, $minRange);
+        return $draftSearch->count() > 0;
+    }
+
+    /**
+     * Get a notification message concerning the editing activity on
+     * a particular page.
+     * @param Page $page
+     * @param null $minRange
+     * @return string
+     */
+    public function getPageEditingActiveMessage(Page $page, $minRange = null)
+    {
+        $pageDraftEdits = $this->activePageEditingQuery($page, $minRange)->get();
+        $userMessage = $pageDraftEdits->count() > 1 ? $pageDraftEdits->count() . ' users have' : $pageDraftEdits->first()->createdBy->name . ' has';
+        $timeMessage = $minRange === null ? 'since the page was last updated' : 'in the last ' . $minRange . ' minutes';
+        $message = '%s started editing this page %s. Take care not to overwrite each other\'s updates!';
+        return sprintf($message, $userMessage, $timeMessage);
+    }
+
+    /**
+     * A query to check for active update drafts on a particular page.
+     * @param Page $page
+     * @param null $minRange
+     * @return mixed
+     */
+    private function activePageEditingQuery(Page $page, $minRange = null)
+    {
+        $query = $this->pageRevision->where('type', '=', 'update_draft')
+            ->where('updated_at', '>', $page->updated_at)
+            ->where('created_by', '!=', auth()->user()->id)
+            ->with('createdBy');
+
+        if ($minRange !== null) {
+            $query = $query->where('updated_at', '>=', Carbon::now()->subMinutes($minRange));
+        }
+
+        return $query;
+    }
+
+    /**
      * Gets a single revision via it's id.
      * @param $id
      * @return mixed

@@ -213,49 +213,85 @@ module.exports = function (ngApp, events) {
     }]);
 
 
-    ngApp.controller('PageEditController',  ['$scope', '$http', '$attrs', '$interval', function ($scope, $http, $attrs, $interval) {
+    ngApp.controller('PageEditController', ['$scope', '$http', '$attrs', '$interval', '$timeout', function ($scope, $http, $attrs, $interval, $timeout) {
 
         $scope.editorOptions = require('./pages/page-form');
         $scope.editorHtml = '';
         $scope.draftText = '';
         var pageId = Number($attrs.pageId);
         var isEdit = pageId !== 0;
+        var autosaveFrequency = 30; // AutoSave interval in seconds.
+        $scope.isDraft = Number($attrs.pageDraft) === 1;
+        if ($scope.isDraft) $scope.draftText = 'Editing Draft';
+
+        var autoSave = false;
+
+        var currentContent = {
+            title: false,
+            html: false
+        };
 
         if (isEdit) {
-            startAutoSave();
+            setTimeout(() => {
+                startAutoSave();
+            }, 1000);
         }
 
-        $scope.editorChange = function() {
-            $scope.draftText = '';
-        }
+        $scope.editorChange = function () {}
 
+        /**
+         * Start the AutoSave loop, Checks for content change
+         * before performing the costly AJAX request.
+         */
         function startAutoSave() {
-            var currentTitle = $('#name').val();
-            var currentHtml = $scope.editorHtml;
-
-            console.log('Starting auto save');
+            currentContent.title = $('#name').val();
+            currentContent.html = $scope.editorHtml;
 
-            $interval(() => {
+            autoSave = $interval(() => {
                 var newTitle = $('#name').val();
                 var newHtml = $scope.editorHtml;
 
-                if (newTitle !== currentTitle || newHtml !== currentHtml) {
-                    currentHtml = newHtml;
-                    currentTitle = newTitle;
+                if (newTitle !== currentContent.title || newHtml !== currentContent.html) {
+                    currentContent.html = newHtml;
+                    currentContent.title = newTitle;
                     saveDraftUpdate(newTitle, newHtml);
                 }
-            }, 1000*5);
+            }, 1000 * autosaveFrequency);
         }
 
+        /**
+         * Save a draft update into the system via an AJAX request.
+         * @param title
+         * @param html
+         */
         function saveDraftUpdate(title, html) {
             $http.put('/ajax/page/' + pageId + '/save-draft', {
                 name: title,
                 html: html
             }).then((responseData) => {
-                $scope.draftText = 'Draft saved'
-            })
+                $scope.draftText = responseData.data.message;
+                $scope.isDraft = true;
+            });
         }
 
+        /**
+         * Discard the current draft and grab the current page
+         * content from the system via an AJAX request.
+         */
+        $scope.discardDraft = function () {
+            $http.get('/ajax/page/' + pageId).then((responseData) => {
+                if (autoSave) $interval.cancel(autoSave);
+                $scope.draftText = '';
+                $scope.isDraft = false;
+                $scope.$broadcast('html-update', responseData.data.html);
+                $('#name').val(currentContent.title);
+                $timeout(() => {
+                    startAutoSave();
+                }, 1000);
+                events.emit('success', 'Draft discarded, The editor has been updated with the current page content');
+            });
+        };
+
     }]);
 
 };
\ No newline at end of file

@@ -162,7 +162,7 @@ module.exports = function (ngApp, events) {
         };
     }]);
 
-    ngApp.directive('tinymce', [function() {
+    ngApp.directive('tinymce', ['$timeout', function($timeout) {
         return {
             restrict: 'A',
             scope: {
@@ -173,14 +173,24 @@ module.exports = function (ngApp, events) {
             link: function (scope, element, attrs) {
 
                 function tinyMceSetup(editor) {
-                    editor.on('keyup', (e) => {
+                    editor.on('ExecCommand change NodeChange ObjectResized', (e) => {
                         var content = editor.getContent();
-                        console.log(content);
-                        scope.$apply(() => {
+                        $timeout(() => {
                             scope.mceModel = content;
                         });
                         scope.mceChange(content);
                     });
+
+                    editor.on('init', (e) => {
+                        scope.mceModel = editor.getContent();
+                    });
+
+                    scope.$on('html-update', (event, value) => {
+                        editor.setContent(value);
+                        editor.selection.select(editor.getBody(), true);
+                        editor.selection.collapse(false);
+                        scope.mceModel = editor.getContent();
+                    });
                 }
 
                 scope.tinymce.extraSetups.push(tinyMceSetup);

@@ -54,10 +54,10 @@ $.expr[":"].contains = $.expr.createPseudo(function (arg) {
 // Global jQuery Elements
 $(function () {
 
-
     var notifications = $('.notification');
     var successNotification = notifications.filter('.pos');
     var errorNotification = notifications.filter('.neg');
+    var warningNotification = notifications.filter('.warning');
     // Notification Events
     window.Events.listen('success', function (text) {
         successNotification.hide();
@@ -66,6 +66,10 @@ $(function () {
             successNotification.show();
         }, 1);
     });
+    window.Events.listen('warning', function (text) {
+        warningNotification.find('span').text(text);
+        warningNotification.show();
+    });
     window.Events.listen('error', function (text) {
         errorNotification.find('span').text(text);
         errorNotification.show();

@@ -54,8 +54,6 @@ var mceOptions = module.exports = {
     extraSetups: [],
     setup: function (editor) {
 
-        console.log(mceOptions.extraSetups);
-
         for (var i = 0; i < mceOptions.extraSetups.length; i++) {
             mceOptions.extraSetups[i](editor);
         }

@@ -161,6 +161,12 @@ form.search-box {
   }
 }
 
+.faded > span.faded-text {
+  display: inline-block;
+  padding: $-s;
+  opacity: 0.5;
+}
+
 .faded-small {
   color: #000;
   font-size: 0.9em;

@@ -38,6 +38,7 @@ $primary-dark: #0288D1;
 $secondary: #e27b41;
 $positive: #52A256;
 $negative: #E84F4F;
+$warning: $secondary;
 $primary-faded: rgba(21, 101, 192, 0.15);
 
 // Item Colors

@@ -88,6 +88,10 @@ body.dragging, body.dragging * {
     background-color: $negative;
     color: #EEE;
   }
+  &.warning {
+    background-color: $secondary;
+    color: #EEE;
+  }
 }
 
 // Loading icon

 
 
 
-<div class="page-editor flex-fill flex" ng-controller="PageEditController" page-id="{{ $model->id or 0 }}">
+<div class="page-editor flex-fill flex" ng-controller="PageEditController" page-id="{{ $model->id or 0 }}" page-draft="{{ $page->isDraft or 0 }}">
 
     {{ csrf_field() }}
     <div class="faded-small toolbar">
@@ -9,15 +9,19 @@
             <div class="row">
                 <div class="col-sm-4 faded">
                     <div class="action-buttons text-left">
+                        <a href="{{ back()->getTargetUrl() }}" class="text-button text-primary"><i class="zmdi zmdi-arrow-left"></i>Back</a>
                         <a onclick="$('body>header').slideToggle();" class="text-button text-primary"><i class="zmdi zmdi-swap-vertical"></i>Toggle Header</a>
                     </div>
                 </div>
                 <div class="col-sm-4 faded text-center">
-                    <span ng-bind="draftText"></span>
+                    <div class="action-buttons text-center" ng-cloak>
+                        <span class="faded-text" ng-bind="draftText"></span>
+                        <button type="button" ng-if="isDraft" ng-click="discardDraft()" class="text-button text-neg"><i class="zmdi zmdi-close-circle"></i>Discard Draft</button>
+                    </div>
                 </div>
                 <div class="col-sm-4 faded">
                     <div class="action-buttons">
-                        <a href="{{ back()->getTargetUrl() }}" class="text-button text-primary"><i class="zmdi zmdi-close"></i>Cancel</a>
+
                         <button type="submit" id="save-button" class="text-button  text-pos"><i class="zmdi zmdi-floppy"></i>Save Page</button>
                     </div>
                 </div>

 
 <div class="notification anim pos" @if(!Session::has('success')) style="display:none;" @endif>
-    <i class="zmdi zmdi-check-circle"></i> <span>{{ Session::get('success') }}</span>
+    <i class="zmdi zmdi-check-circle"></i> <span>{!! nl2br(htmlentities(Session::get('success'))) !!}</span>
+</div>
+
+<div class="notification anim warning stopped" @if(!Session::has('warning')) style="display:none;" @endif>
+    <i class="zmdi zmdi-info"></i> <span>{!! nl2br(htmlentities(Session::get('warning'))) !!}</span>
 </div>
 
 <div class="notification anim neg stopped" @if(!Session::has('error')) style="display:none;" @endif>
-    <i class="zmdi zmdi-alert-circle"></i> <span>{{ Session::get('error') }}</span>
+    <i class="zmdi zmdi-alert-circle"></i> <span>{!! nl2br(htmlentities(Session::get('error'))) !!}</span>
 </div>