feat: add session status filter

src/__tests__/sessionController.test.ts

@@ -0,0 +1,31 @@
+import { describe, it, expect } from 'vitest';
+import { filterSessionsByStatus } from '../controllers/sessionController';
+import { Session } from '../models/Session';
+
+describe('filterSessionsByStatus', () => {
+  const mockSessions: Session[] = [
+    { id: '1', title: 'A', status: 'active', createdAt: new Date(), userId: 'u1' },
+    { id: '2', title: 'B', status: 'completed', createdAt: new Date(), userId: 'u2' },
+    { id: '3', title: 'C', status: 'expired', createdAt: new Date(), userId: 'u3' },
+  ];
+
+  it('returns all sessions when no filter provided', () => {
+    expect(filterSessionsByStatus(mockSessions).length).toBe(3);
+  });
+
+  it('filters by single status', () => {
+    const result = filterSessionsByStatus(mockSessions, ['active']);
+    expect(result.length).toBe(1);
+    expect(result[0].status).toBe('active');
+  });
+
+  it('filters by multiple statuses', () => {
+    const result = filterSessionsByStatus(mockSessions, ['active', 'completed']);
+    expect(result.length).toBe(2);
+  });
+
+  it('returns empty array for invalid statuses', () => {
+    const result = filterSessionsByStatus(mockSessions, ['invalid']);
+    expect(result.length).toBe(0);
+  });
+});

src/controllers/sessionController.ts

@@ -0,0 +1,16 @@
+import { Session, VALID_STATUSES, SessionStatus } from '../models/Session';
+
+export const filterSessionsByStatus = (
+  sessions: Session[],
+  statuses?: string[]
+): Session[] => {
+  if (!statuses || statuses.length === 0) return sessions;
+
+  const validFilters = statuses.filter(s => 
+    VALID_STATUSES.includes(s as SessionStatus)
+  ) as SessionStatus[];
+
+  if (validFilters.length === 0) return [];
+
+  return sessions.filter(session => validFilters.includes(session.status));
+};

src/models/Session.ts

@@ -0,0 +1,11 @@
+export type SessionStatus = 'active' | 'completed' | 'expired' | 'cancelled';
+
+export const VALID_STATUSES: SessionStatus[] = ['active', 'completed', 'expired', 'cancelled'];
+
+export interface Session {
+  id: string;
+  title: string;
+  status: SessionStatus;
+  createdAt: Date;
+  userId: string;
+}