feat: US-005 - Backend API - Skip endpoint with lives system

dashboard/api.py

@@ -58,6 +58,8 @@ class TaskBoardHandler(SimpleHTTPRequestHandler):
             self.handle_habits_post()
         elif self.path.startswith('/api/habits/') and self.path.endswith('/check'):
             self.handle_habits_check()
+        elif self.path.startswith('/api/habits/') and self.path.endswith('/skip'):
+            self.handle_habits_skip()
         elif self.path == '/api/workspace/run':
             self.handle_workspace_run()
         elif self.path == '/api/workspace/stop':
@@ -1768,6 +1770,66 @@ class TaskBoardHandler(SimpleHTTPRequestHandler):
         except Exception as e:
             self.send_json({'error': str(e)}, 500)
     
+    def handle_habits_skip(self):
+        """Skip a day using a life to preserve streak."""
+        try:
+            # Extract habit ID from path (/api/habits/{id}/skip)
+            path_parts = self.path.split('/')
+            if len(path_parts) < 5:
+                self.send_json({'error': 'Invalid path'}, 400)
+                return
+            
+            habit_id = path_parts[3]
+            
+            # Read existing habits
+            if not HABITS_FILE.exists():
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            with open(HABITS_FILE, 'r', encoding='utf-8') as f:
+                habits_data = json.load(f)
+            
+            # Find habit
+            habit = None
+            for h in habits_data.get('habits', []):
+                if h['id'] == habit_id:
+                    habit = h
+                    break
+            
+            if not habit:
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            # Verify lives > 0
+            current_lives = habit.get('lives', 3)
+            if current_lives <= 0:
+                self.send_json({'error': 'No lives remaining'}, 400)
+                return
+            
+            # Decrement lives by 1
+            habit['lives'] = current_lives - 1
+            
+            # Add completion entry with type='skip'
+            today = datetime.now().date().isoformat()
+            completion_entry = {
+                'date': today,
+                'type': 'skip'
+            }
+            habit['completions'].append(completion_entry)
+            
+            # Update timestamp
+            habit['updatedAt'] = datetime.now().isoformat()
+            habits_data['lastUpdated'] = habit['updatedAt']
+            
+            # Save to file
+            with open(HABITS_FILE, 'w', encoding='utf-8') as f:
+                json.dump(habits_data, f, indent=2)
+            
+            # Return updated habit
+            self.send_json(habit, 200)
+        except Exception as e:
+            self.send_json({'error': str(e)}, 500)
+    
     def send_json(self, data, code=200):
         self.send_response(code)
         self.send_header('Content-Type', 'application/json')