feat: 5.0 - Backend API - POST /api/habits/{id}/check

dashboard/api.py

@@ -151,6 +151,8 @@ class TaskBoardHandler(SimpleHTTPRequestHandler):
             self.handle_pdf_post()
         elif self.path == '/api/habits':
             self.handle_habits_post()
+        elif self.path.startswith('/api/habits/') and self.path.endswith('/check'):
+            self.handle_habits_check()
         elif self.path == '/api/workspace/run':
             self.handle_workspace_run()
         elif self.path == '/api/workspace/stop':
@@ -881,6 +883,93 @@ class TaskBoardHandler(SimpleHTTPRequestHandler):
         except Exception as e:
             self.send_json({'error': str(e)}, 500)
     
+    def handle_habits_check(self):
+        """Mark a habit as completed for today."""
+        try:
+            # Extract habit ID from path: /api/habits/{id}/check
+            path_parts = self.path.split('/')
+            if len(path_parts) < 4:
+                self.send_json({'error': 'Invalid path'}, 400)
+                return
+            
+            habit_id = path_parts[3]  # /api/habits/{id}/check -> index 3 is id
+            
+            # Get today's date in ISO format (YYYY-MM-DD)
+            today = datetime.now().date().isoformat()
+            
+            # Read habits file
+            habits_file = KANBAN_DIR / 'habits.json'
+            if not habits_file.exists():
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            try:
+                habits_data = json.loads(habits_file.read_text(encoding='utf-8'))
+            except (json.JSONDecodeError, IOError):
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            # Find the habit by ID
+            habit = None
+            habit_index = None
+            for i, h in enumerate(habits_data.get('habits', [])):
+                if h.get('id') == habit_id:
+                    habit = h
+                    habit_index = i
+                    break
+            
+            if habit is None:
+                self.send_json({'error': 'Habit not found'}, 404)
+                return
+            
+            # Check if already checked today
+            completions = habit.get('completions', [])
+            
+            # Extract dates from completions (they might be ISO timestamps, we need just the date part)
+            completion_dates = []
+            for comp in completions:
+                try:
+                    # Parse ISO timestamp and extract date
+                    dt = datetime.fromisoformat(comp.replace('Z', '+00:00'))
+                    completion_dates.append(dt.date().isoformat())
+                except (ValueError, AttributeError):
+                    # If parsing fails, assume it's already a date string
+                    completion_dates.append(comp)
+            
+            if today in completion_dates:
+                self.send_json({'error': 'Habit already checked today'}, 400)
+                return
+            
+            # Add today's date to completions
+            completions.append(today)
+            
+            # Sort completions chronologically (oldest first)
+            completions.sort()
+            
+            # Update habit
+            habit['completions'] = completions
+            
+            # Calculate streak
+            frequency = habit.get('frequency', 'daily')
+            streak = calculate_streak(completions, frequency)
+            
+            # Add streak to response (but don't persist it in JSON)
+            habit_with_streak = habit.copy()
+            habit_with_streak['streak'] = streak
+            
+            # Update habits data
+            habits_data['habits'][habit_index] = habit
+            habits_data['lastUpdated'] = datetime.now().isoformat()
+            
+            # Write back to file
+            habits_file.write_text(json.dumps(habits_data, indent=2), encoding='utf-8')
+            
+            # Return 200 OK with updated habit including streak
+            self.send_json(habit_with_streak, 200)
+            
+        except Exception as e:
+            self.send_json({'error': str(e)}, 500)
+    
     def handle_files_get(self):
         """List files or get file content."""
         from urllib.parse import urlparse, parse_qs