add/ delete tutorials/steps in initial state of redux based on tutorials.json

src/reducers/tutorialReducer.js

@@ -2,10 +2,47 @@ import { TUTORIAL_SUCCESS, TUTORIAL_ERROR, TUTORIAL_CHANGE, TUTORIAL_XML, TUTORI
 
 import tutorials from '../components/Tutorial/tutorials.json';
 
+const initialStatus = () => {
+  if(window.localStorage.getItem('status')){
+    var status = JSON.parse(window.localStorage.getItem('status'));
+    var existingTutorialIds = [];
+    for(var i = 0; i < tutorials.length; i++){
+      var tutorialsId = tutorials[i].id
+      existingTutorialIds.push(tutorialsId);
+      if(status.findIndex(status => status.id === tutorialsId) > -1){
+        var tasks = tutorials[i].steps.filter(step => step.type === 'task');
+        var existingTaskIds = [];
+        for(var j = 0; j < tasks.length; j++){
+          var tasksId = tasks[j].id;
+          existingTaskIds.push(tasksId);
+          if(status[i].tasks.findIndex(task => task.id === tasksId) === -1){
+            // task does not exist
+            status[i].tasks.push({id: tasksId});
+          }
+        }
+        // deleting old tasks which do not longer exist
+        if(existingTaskIds.length > 0){
+          status[i].tasks = status[i].tasks.filter(task => existingTaskIds.indexOf(task.id) > -1);
+        }
+      }
+      else{
+        status.push({id: tutorialsId, tasks: new Array(tutorials[i].steps.filter(step => step.type === 'task').length).fill({})});
+      }
+    }
+    // deleting old tutorials which do not longer exist
+    if(existingTutorialIds.length > 0){
+      status = status.filter(status => existingTutorialIds.indexOf(status.id) > -1);
+    }
+    console.log('tutorial', existingTutorialIds);
+    console.log('tutorial', status);
+    return status;
+  }
+  // window.localStorage.getItem('status') does not exist
+  return tutorials.map(tutorial => {return {id: tutorial.id, tasks: tutorial.steps.filter(step => step.type === 'task').map(task => {return {id: task.id};})};});
+};
+
 const initialState = {
-  status: window.localStorage.getItem('status') ?
-            JSON.parse(window.localStorage.getItem('status'))
-          : tutorials.map(tutorial => {return {id: tutorial.id, tasks: new Array(tutorial.steps.filter(step => step.type === 'task').length).fill({}) };}),
+  status: initialStatus(),
   currentId: null,
   activeStep: 0,
   change: 0