feat: Add instructor registration endpoint and rename student registration to learner registration.

Backend/src/services/auth.service.ts

@@ -139,6 +139,79 @@ export class AuthService {
         };
     }
 
+    async registerInstructor(data: RegisterRequest): Promise<RegisterResponse> {
+        const { username, email, password, first_name, last_name, prefix, phone } = data;
+
+        // Check if username already exists
+        const existingUsername = await prisma.user.findUnique({
+            where: { username }
+        });
+
+        if (existingUsername) {
+            throw new ValidationError('Username already exists');
+        }
+
+        // Check if email already exists
+        const existingEmail = await prisma.user.findUnique({
+            where: { email }
+        });
+
+        if (existingEmail) {
+            throw new ValidationError('Email already exists');
+        }
+
+        // Check if phone number already exists in user profiles
+        const existingPhone = await prisma.userProfile.findFirst({
+            where: { phone }
+        });
+
+        if (existingPhone) {
+            throw new ValidationError('Phone number already exists');
+        }
+
+        // Get INSTRUCTOR role
+        const instructorRole = await prisma.role.findUnique({
+            where: { code: 'INSTRUCTOR' }
+        });
+
+        if (!instructorRole) {
+            logger.error('INSTRUCTOR role not found in database');
+            throw new Error('System configuration error');
+        }
+
+        // Hash password
+        const hashedPassword = await bcrypt.hash(password, 10);
+
+        // Create user with profile
+        const user = await prisma.user.create({
+            data: {
+                username,
+                email,
+                password: hashedPassword,
+                role_id: instructorRole.id,
+                profile: {
+                    create: {
+                        prefix: prefix ? prefix as Prisma.InputJsonValue : Prisma.JsonNull,
+                        first_name,
+                        last_name,
+                        phone
+                    }
+                }
+            },
+            include: {
+                role: true,
+                profile: true
+            }
+        });
+
+        logger.info('New user registered', { userId: user.id, username: user.username });
+
+        return {
+            user: this.formatUserResponse(user),
+            message: 'Registration successful'
+        };
+    }   
+
     /**
      * Refresh access token
      */