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@Controller
public class AdminController {

    @Autowired
    private QuestionService questionService;

    @RequestMapping(value = "/view-reports", method = RequestMethod.GET)
    public String viewReports() {
        return "admin-view-reports";
    }

    @RequestMapping(value = "/add-questions-file", method = RequestMethod.GET)
    public String addQuestionsFile() {
        return "admin-add-questions-file";
    }

    @RequestMapping(value = "/upload-questions-file", method = RequestMethod.POST)
    public String uploadQuestionsFile(@RequestParam("file") MultipartFile file) {
        try {
            // validate the file
            if (!file.getContentType().equals("application/vnd.ms-excel")) {
                throw new InvalidFileException("Invalid file format");
            }

            // parse the file and save the questions to the database
            questionService.addQuestionsFromExcel(file.getInputStream());

            return "admin-upload-success";
        } catch (IOException e) {
            e.printStackTrace();
            return "admin-upload-error";
        } catch (InvalidFileException e) {
            e.printStackTrace();
            return "admin-upload-error";
        }
    }

    @RequestMapping(value = "/remove-questions-file", method = RequestMethod.GET)
    public String removeQuestionsFile() {
        return "admin-remove-questions-file";
    }

    @RequestMapping(value = "/delete-questions-file", method = RequestMethod.POST)
    public String deleteQuestionsFile(@RequestParam("fileName") String fileName) {
        try {
            questionService.deleteQuestionsFile(fileName);
            return "admin-delete-success";
        } catch (IOException e) {
            e.printStackTrace();
            return "admin-delete-error";
        }
    }
}