added jwt auth to service

src/main/java/zw/qantra/tm/domain/services/UserService.java

@@ -0,0 +1,67 @@
+package zw.qantra.tm.domain.services;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import zw.qantra.tm.domain.dtos.AuthResponse;
+import zw.qantra.tm.domain.dtos.LoginRequest;
+import zw.qantra.tm.domain.dtos.RegisterRequest;
+import zw.qantra.tm.domain.models.User;
+import zw.qantra.tm.domain.repositories.UserRepository;
+import zw.qantra.tm.utils.JwtUtils;
+
+@Service
+@RequiredArgsConstructor
+public class UserService implements UserDetailsService {
+
+    private final UserRepository userRepository;
+    private final PasswordEncoder passwordEncoder;
+    private final JwtUtils jwtUtils;
+
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        return userRepository.findByUsername(username)
+                .orElseThrow(() -> new UsernameNotFoundException("User not found with username: " + username));
+    }
+
+    public AuthResponse register(RegisterRequest request) {
+        if (userRepository.existsByUsername(request.getUsername())) {
+            throw new RuntimeException("Username already exists");
+        }
+        
+        if (userRepository.existsByEmail(request.getEmail())) {
+            throw new RuntimeException("Email already exists");
+        }
+
+        User user = new User();
+        user.setUsername(request.getUsername());
+        user.setPassword(passwordEncoder.encode(request.getPassword()));
+        user.setEmail(request.getEmail());
+        user.setFirstName(request.getFirstName());
+        user.setLastName(request.getLastName());
+        user.setPhone(request.getPhone());
+
+        User savedUser = userRepository.save(user);
+        String token = jwtUtils.generateToken(savedUser);
+
+        return new AuthResponse(token, "Bearer", savedUser.getUsername(), 
+                savedUser.getEmail(), savedUser.getPhone(), savedUser.getFirstName(), savedUser.getLastName());
+    }
+
+    public AuthResponse login(LoginRequest request) {
+        User user = userRepository.findByUsername(request.getUsername())
+                .orElseThrow(() -> new RuntimeException("Invalid username or password"));
+        
+        if (!passwordEncoder.matches(request.getPassword(), user.getPassword())) {
+            throw new RuntimeException("Invalid username or password");
+        }
+        
+        String token = jwtUtils.generateToken(user);
+        
+        return new AuthResponse(token, "Bearer", user.getUsername(), 
+                user.getEmail(), user.getPhone(), user.getFirstName(), user.getLastName());
+    }
+}