SiteBackend/src/main/java/com/alttd/forms/controlers/ControllerExceptionHandler.java

package com.alttd.forms.controlers;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;

import java.util.HashMap;
import java.util.Map;

@ControllerAdvice
public class ControllerExceptionHandler {

    private static final Logger logger = LoggerFactory.getLogger(ControllerExceptionHandler.class);

    public ControllerExceptionHandler() {
        logger.info("ControllerExceptionHandler initialized");  // Ensure this gets logged
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
        logger.debug("invalid request", ex);
        Map<String, String> errors = new HashMap<>();
        ex.getBindingResult().getAllErrors().forEach((error) -> {
            String fieldName = ((FieldError) error).getField();
            String errorMessage = error.getDefaultMessage();
            errors.put(fieldName, errorMessage);
        });
        if (logger.isDebugEnabled()) {
            try {
                String errorsAsString = new ObjectMapper().writeValueAsString(errors);
                logger.debug("Invalid parameters\n{}", errorsAsString);
            } catch (JsonProcessingException e) {
                logger.warn("Failed to parse errors to json", e);
            }
        }
        return ResponseEntity.badRequest().body(errors);
    }
}