Migrated the [TaskModel] to use an enum to represent is priority

lib/src/blocs/home_bloc.dart

@@ -22,7 +22,8 @@ class HomeBloc {
   StreamTransformer<List<TaskModel>, List<TaskModel>>
       prioritySortTransformer() {
     return StreamTransformer.fromHandlers(handleData: (tasksList, sink) {
-      tasksList.sort((a, b) => b.priority.compareTo(a.priority));
+      tasksList
+          .sort((a, b) => b.ecodedPriority().compareTo(a.ecodedPriority()));
       sink.add(tasksList);
     });
   }

lib/src/models/task_model.dart

@@ -3,7 +3,7 @@ import 'package:meta/meta.dart';
 class TaskModel {
   final String id;
   final String text;
-  final int priority;
+  final TaskPriority priority;
   final String ownerUsername;
   final bool done;
   final String event;
@@ -20,7 +20,7 @@ class TaskModel {
   TaskModel.fromFirestore(Map<String, dynamic> firestoreMap, {String id})
       : id = id,
         text = firestoreMap["text"],
-        priority = firestoreMap["priority"],
+        priority = decodedPriority(firestoreMap["priority"]),
         ownerUsername = firestoreMap["ownerUsername"],
         done = firestoreMap["done"],
         event = firestoreMap["event"];
@@ -28,7 +28,7 @@ class TaskModel {
   Map<String, dynamic> toFirestoreMap() {
     return <String, dynamic>{
       "text": text,
-      "priority": priority,
+      "priority": ecodedPriority(),
       "ownerUsername": ownerUsername,
       "done": done,
       "event": event,
@@ -37,13 +37,13 @@ class TaskModel {
 
   String getPriorityText() {
     switch (priority) {
-      case 0:
+      case TaskPriority.low:
         return 'Low';
         break;
-      case 1:
+      case TaskPriority.medium:
         return 'Medium';
         break;
-      case 2:
+      case TaskPriority.high:
         return 'High';
         break;
       default:
@@ -51,6 +51,38 @@ class TaskModel {
     }
   }
 
+  static TaskPriority decodedPriority(int priority) {
+    switch (priority) {
+      case 0:
+        return TaskPriority.low;
+        break;
+      case 1:
+        return TaskPriority.medium;
+        break;
+      case 2:
+        return TaskPriority.high;
+        break;
+      default:
+        return TaskPriority.none;
+    }
+  }
+
+  int ecodedPriority() {
+    switch (priority) {
+      case TaskPriority.low:
+        return 0;
+        break;
+      case TaskPriority.medium:
+        return 1;
+        break;
+      case TaskPriority.high:
+        return 2;
+        break;
+      default:
+        return -1;
+    }
+  }
+
   static TaskModel sample() {
     return TaskModel(
       id: '1',
@@ -59,7 +91,7 @@ class TaskModel {
       done: false,
       ownerUsername: 'testUser',
       event: 'testEvent',
-      priority: 1,
+      priority: TaskPriority.medium,
     );
   }
 
@@ -84,3 +116,10 @@ class TaskModel {
           done == other.done &&
           event == other.event;
 }
+
+enum TaskPriority {
+  high,
+  medium,
+  low,
+  none,
+}

lib/src/utils.dart

@@ -1,15 +1,16 @@
 import 'package:flutter/material.dart';
+import './models/task_model.dart';
 
 // TODO: migrate to enum https://github.com/AYM1607/do_more/issues/4
-Color getColorFromPriority(int priority) {
+Color getColorFromPriority(TaskPriority priority) {
   switch (priority) {
-    case 0:
+    case TaskPriority.low:
       return Color(0xFF06AD12);
       break;
-    case 1:
+    case TaskPriority.medium:
       return Color(0xFFF6A93B);
       break;
-    case 2:
+    case TaskPriority.high:
       return Color(0xFFF42850);
       break;
     default: