Name : Abdullahi Hussein Abdikariim ID_Card : C1220172 Class_Name : CA221

@RestController public class GreetingController {

@GetMapping("/")
public String welcome() {
    return "Welcome to the Spring Boot Application!";
}

@GetMapping("/greet/{name}")
public String greet(@PathVariable String name) {
    return "Hello, " + name + "!";
}

}

@RestController public class ResponseController {

@GetMapping("/success")
public ResponseEntity<String> success() {
    HttpHeaders headers = new HttpHeaders();
    headers.add("Custom-Header", "SuccessHeader");
    return ResponseEntity.ok().headers(headers).body("Request was successful!");
}

@GetMapping("/not-found")
public ResponseEntity<String> notFound() {
    return ResponseEntity.status(HttpStatus.NOT_FOUND).body("Resource not found");
}

@PostMapping("/create")
public ResponseEntity<String> create() {
    URI location = URI.create("/resource/123");
    return ResponseEntity.created(location).body("Resource created at /resource/123");
}

}

@Data @AllArgsConstructor @NoArgsConstructor public class Staff { private Long id; private String name; private String position; }

@Service public class StaffService { private final Map<Long, Staff> staffMap = new HashMap<>(); private long idCounter = 1;

public List<Staff> getAllStaff() {
    return new ArrayList<>(staffMap.values());
}

public Staff getStaffById(Long id) {
    return staffMap.get(id);
}

public Staff createStaff(Staff staff) {
    staff.setId(idCounter++);
    staffMap.put(staff.getId(), staff);
    return staff;
}

public Staff updateStaff(Long id, Staff updatedStaff) {
    if (staffMap.containsKey(id)) {
        updatedStaff.setId(id);
        staffMap.put(id, updatedStaff);
        return updatedStaff;
    }
    return null;
}

public boolean deleteStaff(Long id) {
    return staffMap.remove(id) != null;
}

}

@RestController @RequestMapping("/staffs") public class StaffController {

@Autowired
private StaffService staffService;

@GetMapping
public List<Staff> getAllStaffs() {
    return staffService.getAllStaff();
}

@GetMapping("/{id}")
public ResponseEntity<?> getStaff(@PathVariable Long id) {
    Staff staff = staffService.getStaffById(id);
    return staff != null ? ResponseEntity.ok(staff)
            : ResponseEntity.status(HttpStatus.NOT_FOUND).body("Staff not found");
}

@PostMapping
public ResponseEntity<Staff> createStaff(@RequestBody Staff staff) {
    Staff created = staffService.createStaff(staff);
    return ResponseEntity.status(HttpStatus.CREATED).body(created);
}

@PutMapping("/{id}")
public ResponseEntity<?> updateStaff(@PathVariable Long id, @RequestBody Staff staff) {
    Staff updated = staffService.updateStaff(id, staff);
    return updated != null ? ResponseEntity.ok(updated)
            : ResponseEntity.status(HttpStatus.NOT_FOUND).body("Staff not found");
}

@DeleteMapping("/{id}")
public ResponseEntity<?> deleteStaff(@PathVariable Long id) {
    boolean deleted = staffService.deleteStaff(id);
    return deleted ? ResponseEntity.ok("Deleted successfully")
            : ResponseEntity.status(HttpStatus.NOT_FOUND).body("Staff not found");
}

}