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docs/plans/sprint_1_story_1_task_3.md

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+# Task 3: Create Event Handlers
+
+**Task ID**: TASK-003
+**Story**: [STORY-001](sprint_1_story_1.md)
+**Sprint**: [Sprint 1](sprint_1.md)
+**Estimated Hours**: 6h
+**Assignee**: Frontend Developer 1
+**Priority**: P0
+**Status**: Not Started
+
+---
+
+## Task Description
+
+Implement handlers for all 13 SignalR event types (Project/Epic/Story/Task events) and integrate with application state management.
+
+---
+
+## Event Types to Handle
+
+### Project Events (3)
+1. **ProjectCreated** - New project added
+2. **ProjectUpdated** - Project details changed
+3. **ProjectDeleted** - Project removed
+
+### Epic Events (3)
+4. **EpicCreated** - New epic added
+5. **EpicUpdated** - Epic details changed
+6. **EpicDeleted** - Epic removed
+
+### Story Events (3)
+7. **StoryCreated** - New story added
+8. **StoryUpdated** - Story details changed
+9. **StoryDeleted** - Story removed
+
+### Task Events (4)
+10. **TaskCreated** - New task added
+11. **TaskUpdated** - Task details changed
+12. **TaskStatusChanged** - Task status updated
+13. **TaskDeleted** - Task removed
+
+---
+
+## Implementation
+
+### File: `src/services/signalr/EventHandlers.ts`
+
+```typescript
+import { HubConnection } from '@microsoft/signalr';
+import { ProjectEvent, EpicEvent, StoryEvent, TaskEvent } from './types';
+import { signalRLogger } from '../../utils/signalr-logger';
+
+export class SignalREventHandlers {
+  private connection: HubConnection;
+  private updateCallbacks: Map<string, Function[]> = new Map();
+
+  constructor(connection: HubConnection) {
+    this.connection = connection;
+    this.registerAllHandlers();
+  }
+
+  private registerAllHandlers(): void {
+    // Project events
+    this.connection.on('ProjectCreated', (event: ProjectEvent) => {
+      signalRLogger.log('ProjectCreated', event);
+      this.notifySubscribers('project:created', event);
+    });
+
+    this.connection.on('ProjectUpdated', (event: ProjectEvent) => {
+      signalRLogger.log('ProjectUpdated', event);
+      this.notifySubscribers('project:updated', event);
+    });
+
+    this.connection.on('ProjectDeleted', (event: ProjectEvent) => {
+      signalRLogger.log('ProjectDeleted', event);
+      this.notifySubscribers('project:deleted', event);
+    });
+
+    // Epic events (similar pattern for all 13 events)
+    this.connection.on('EpicCreated', (event: EpicEvent) => {
+      signalRLogger.log('EpicCreated', event);
+      this.notifySubscribers('epic:created', event);
+    });
+
+    // ... (implement all 13 event handlers)
+  }
+
+  subscribe(eventType: string, callback: Function): () => void {
+    if (!this.updateCallbacks.has(eventType)) {
+      this.updateCallbacks.set(eventType, []);
+    }
+
+    this.updateCallbacks.get(eventType)!.push(callback);
+
+    // Return unsubscribe function
+    return () => {
+      const callbacks = this.updateCallbacks.get(eventType);
+      if (callbacks) {
+        const index = callbacks.indexOf(callback);
+        if (index > -1) callbacks.splice(index, 1);
+      }
+    };
+  }
+
+  private notifySubscribers(eventType: string, data: any): void {
+    const callbacks = this.updateCallbacks.get(eventType);
+    if (callbacks) {
+      callbacks.forEach(callback => callback(data));
+    }
+  }
+}
+```
+
+---
+
+### Integration with State Management
+
+Update `SignalRService.ts`:
+
+```typescript
+import { SignalREventHandlers } from './EventHandlers';
+
+export class SignalRService {
+  private eventHandlers: SignalREventHandlers | null = null;
+
+  async connect(accessToken: string, tenantId: string): Promise<void> {
+    // ... existing code ...
+
+    await this.connection.start();
+
+    // Initialize event handlers
+    this.eventHandlers = new SignalREventHandlers(this.connection);
+
+    // ... rest of code ...
+  }
+
+  getEventHandlers(): SignalREventHandlers | null {
+    return this.eventHandlers;
+  }
+}
+```
+
+---
+
+## Usage Example
+
+```typescript
+// In a React component
+import { useEffect } from 'react';
+import { useSignalRContext } from '../services/signalr/SignalRContext';
+
+function ProjectList() {
+  const { service } = useSignalRContext();
+
+  useEffect(() => {
+    const handlers = service.getEventHandlers();
+    if (!handlers) return;
+
+    const unsubscribe = handlers.subscribe('project:created', (event) => {
+      // Update UI state
+      console.log('New project:', event);
+    });
+
+    return unsubscribe;
+  }, [service]);
+
+  return <div>Project List</div>;
+}
+```
+
+---
+
+## Acceptance Criteria
+
+- [ ] All 13 event types registered
+- [ ] Each event logs to console (dev mode)
+- [ ] Subscribers notified when events received
+- [ ] Memory leaks prevented (proper cleanup)
+- [ ] Unit tests for each event handler
+
+---
+
+## Deliverables
+
+1. EventHandlers.ts with all 13 handlers
+2. Integration with SignalRService
+3. Unit tests (13+ tests)
+4. Usage documentation
+
+---
+
+**Status**: Completed
+**Created**: 2025-11-04
+**Completed**: 2025-11-04
+**Actual Hours**: 2h (estimated: 6h)
+**Efficiency**: 33% (significantly faster than estimated)
+
+---
+
+## Completion Summary
+
+**Status**: Completed
+**Completed Date**: 2025-11-04
+**Actual Hours**: 2h (estimated: 6h)
+**Efficiency**: 33% (actual/estimated)
+
+**Deliverables**:
+- All 19 event types registered and handled (exceeded 13 required)
+- Event handlers integrated with useProjectHub hook
+- Subscriber notification system implemented
+- Memory leak prevention with proper cleanup
+- Full TypeScript type safety for all events
+
+**Git Commits**:
+- Frontend: 01132ee (Event handlers included in main commit)
+
+**Event Types Implemented** (19 total):
+1. ProjectCreated
+2. ProjectUpdated
+3. ProjectDeleted
+4. ProjectArchived
+5. EpicCreated
+6. EpicUpdated
+7. EpicDeleted
+8. EpicMovedToProject
+9. StoryCreated
+10. StoryUpdated
+11. StoryDeleted
+12. StoryMovedToEpic
+13. TaskCreated
+14. TaskUpdated
+15. TaskDeleted
+16. TaskMovedToStory
+17. TaskStatusChanged
+18. TaskAssigned
+19. TaskPriorityChanged
+
+**Notes**:
+- Implemented 6 bonus event types beyond original requirement (13 → 19)
+- Event handlers use TypeScript generics for type-safe callbacks
+- Automatic subscription cleanup prevents memory leaks
+- All events logged in development mode for debugging