Record user visits on posts listing

src/main/java/com/openisle/service/UserVisitService.java

@@ -0,0 +1,35 @@
+package com.openisle.service;
+
+import com.openisle.model.User;
+import com.openisle.model.UserVisit;
+import com.openisle.repository.UserRepository;
+import com.openisle.repository.UserVisitRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDate;
+
+@Service
+@RequiredArgsConstructor
+public class UserVisitService {
+    private final UserVisitRepository userVisitRepository;
+    private final UserRepository userRepository;
+
+    public void recordVisit(String username) {
+        User user = userRepository.findByUsername(username)
+                .orElseThrow(() -> new IllegalArgumentException("User not found"));
+        LocalDate today = LocalDate.now();
+        userVisitRepository.findByUserAndVisitDate(user, today).orElseGet(() -> {
+            UserVisit visit = new UserVisit();
+            visit.setUser(user);
+            visit.setVisitDate(today);
+            return userVisitRepository.save(visit);
+        });
+    }
+
+    public long countVisits(String username) {
+        User user = userRepository.findByUsername(username)
+                .orElseThrow(() -> new IllegalArgumentException("User not found"));
+        return userVisitRepository.countByUser(user);
+    }
+}