feat(project_management): Calculate project completion percentage and display

ref: #293 #301

app/api/serializers/project_management/projects.py

@@ -11,6 +11,10 @@ class ProjectSerializer(
     serializers.ModelSerializer,
 ):
 
+    percent_completed = serializers.CharField(
+        read_only = True,        
+    )
+
     url = serializers.SerializerMethodField('get_url')
 
 
@@ -58,6 +62,7 @@ class ProjectSerializer(
             'manager_team',
             'team_members',
             'project_tasks_url',
+            'percent_completed',
             'created',
             'modified',
             'external_ref',

app/project_management/forms/project.py

@@ -136,10 +136,11 @@ class DetailForm(ProjectForm):
             initial = to_duration(self.instance.duration_project),
         )
 
-        self.fields['resources'] = forms.CharField(
-            label = 'Available Resources',
+        self.fields['completed'] = forms.CharField(
             disabled = True,
-            initial = 'xx/yy CPU, xx/yy RAM, xx/yy Storage',
+            help_text = 'Project completion percentage.',
+            initial = self.instance.percent_completed,
+            label = 'Completed',
         )
 
         self.tabs['details'].update({

app/project_management/models/projects.py

@@ -202,5 +202,36 @@ class Project(ProjectCommonFieldsName):
             str: Calculated percentage of project completion.
         """
 
-        return 'xx %'
+        from core.models.ticket.ticket import Ticket
+
+        ticket_status_closed = [
+            TicketValues._CANCELLED_INT,
+            TicketValues._CLOSED_INT,
+            TicketValues._SOLVED_INT,
+        ]
+
+        all_tickets = Ticket.objects.filter(
+            project = self.id,
+        ).exclude(
+            status__in = ticket_status_closed
+        )
+
+        closed_tickets = Ticket.objects.filter(
+            project = self.id,
+            status__in = ticket_status_closed
+        )
+
+        calculation: int = 0
+
+        if len(all_tickets) > 0:
+
+            if len(closed_tickets) > 0:
+
+                calculation: int = int(
+                    (
+                        len(closed_tickets) / len(all_tickets)
+                    ) * 100
+                )
+
+        return str(calculation) + '%'