feat: added feature for downloading user report csv file

src/main/java/com/quiz_app/config/security/SecurityConfiguration.java

@@ -44,6 +44,7 @@ public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Excepti
                         "/api/v1/auth/**",
                         "/api/v1/quiz/public/**",
                         "/api/v1/storage/public/**",
+                        "/api/v1/reports/users/csv",
                         "/v2/api-docs",
                         "/v3/api-docs",
                         "/v3/api-docs/**",

src/main/java/com/quiz_app/controller/reportcontroller/ReportController.java

@@ -0,0 +1,95 @@
+package com.quiz_app.controller.reportcontroller;
+
+import com.quiz_app.entity.user.Role;
+import com.quiz_app.entity.user.User;
+import com.quiz_app.service.report.ReportService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import com.opencsv.CSVWriter;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/v1/reports")
+//@RequiredArgsConstructor
+@CrossOrigin(origins = "http://localhost:3000")
+public class ReportController {
+
+    private final ReportService reportService;
+
+    @Autowired
+    public ReportController(ReportService reportService) {
+        this.reportService = reportService;
+    }
+
+    @GetMapping("/users/csv")
+    public ResponseEntity<String> generateUserReportCSV() {
+        System.out.println("ggggggggggggggggggggggggggggg");
+//        List<User> users = reportService.getAllUsers();
+        User user = User.builder()
+                .id(1)
+                .username("user1")
+                .firstname("Abu")
+                .lastname("Darda")
+                .email("a@a.com")
+                .role(Role.USER)
+                .phoneNumber("1234567890")
+                .dateOfBirth(LocalDate.now())
+                .build();
+
+        List<User> users = Collections.singletonList(user);
+        // Generate CSV content using OpenCSV
+        String csvContent = generateCSV(users);
+        System.out.println("Number of users: " + users.size());
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.parseMediaType("text/csv"));
+        headers.set(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=users_report.csv");
+
+        return new ResponseEntity<>(csvContent, headers, HttpStatus.OK);
+    }
+
+    // go for pdf
+
+    private String generateCSV(List<User> users) {
+        // Implement the logic to convert the user data into CSV format using OpenCSV
+
+        StringWriter writer = new StringWriter();
+        try (CSVWriter csvWriter = new CSVWriter(writer)) {
+            String[] header = {"ID", "Username", "Firstname", "Lastname", "Email", "Role", "Phone Number", "Date of Birth"};
+            csvWriter.writeNext(header);
+
+            for (User user : users) {
+                String[] row = {
+                        String.valueOf(user.getId()),
+                        user.getUsername(),
+                        user.getFirstname(),
+                        user.getLastname(),
+                        user.getEmail(),
+                        user.getRole().toString(),
+                        user.getPhoneNumber(),
+                        user.getDateOfBirth().toString()
+                };
+                csvWriter.writeNext(row);
+            }
+        } catch (IOException e) {
+            // Handle CSV generation error
+            e.printStackTrace();
+        }
+
+        return writer.toString();
+    }
+}

src/main/java/com/quiz_app/service/report/ReportService.java

@@ -0,0 +1,30 @@
+package com.quiz_app.service.report;
+
+import com.quiz_app.entity.user.User;
+import com.quiz_app.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+@Service
+//@RequiredArgsConstructor
+@RestController
+@RequestMapping("/api/reports")
+//@CrossOrigin(origins = "http://localhost:3000") // Replace with your frontend URL
+public class ReportService {
+
+    private final UserRepository userRepository;
+
+    @Autowired
+    public ReportService(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
+    public List<User> getAllUsers() {
+        return userRepository.findAll();
+    }
+}