Exception handling with @ControllerAdvice

package com.example.demo.exception;

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.context.request.WebRequest;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(ResourceNotFoundException.class)
    public ResponseEntity<ErrorResponse> handleResourceNotFound(
        ResourceNotFoundException ex,
        WebRequest request
    ) {
        ErrorResponse error = new ErrorResponse(
            HttpStatus.NOT_FOUND.value(),
            ex.getMessage(),
            request.getDescription(false),
            LocalDateTime.now()
        );
        return new ResponseEntity<>(error, HttpStatus.NOT_FOUND);
    }

    @ExceptionHandler(BadRequestException.class)
    public ResponseEntity<ErrorResponse> handleBadRequest(
        BadRequestException ex,
        WebRequest request
    ) {
        ErrorResponse error = new ErrorResponse(
            HttpStatus.BAD_REQUEST.value(),
            ex.getMessage(),
            request.getDescription(false),
            LocalDateTime.now()
        );
        return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ValidationErrorResponse> handleValidationErrors(
        MethodArgumentNotValidException 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);
        });

        ValidationErrorResponse response = new ValidationErrorResponse(
            HttpStatus.BAD_REQUEST.value(),
            "Validation failed",
            errors,
            LocalDateTime.now()
        );

        return new ResponseEntity<>(response, HttpStatus.BAD_REQUEST);
    }

    @ExceptionHandler(DuplicateResourceException.class)
    public ResponseEntity<ErrorResponse> handleDuplicateResource(
        DuplicateResourceException ex,
        WebRequest request
    ) {
        ErrorResponse error = new ErrorResponse(
            HttpStatus.CONFLICT.value(),
            ex.getMessage(),
            request.getDescription(false),
            LocalDateTime.now()
        );
        return new ResponseEntity<>(error, HttpStatus.CONFLICT);
    }

    @ExceptionHandler(UnauthorizedException.class)
    public ResponseEntity<ErrorResponse> handleUnauthorized(
        UnauthorizedException ex,
        WebRequest request
    ) {
        ErrorResponse error = new ErrorResponse(
            HttpStatus.UNAUTHORIZED.value(),
            ex.getMessage(),
            request.getDescription(false),
            LocalDateTime.now()
        );
        return new ResponseEntity<>(error, HttpStatus.UNAUTHORIZED);
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<ErrorResponse> handleGlobalException(
        Exception ex,
        WebRequest request
    ) {
        ErrorResponse error = new ErrorResponse(
            HttpStatus.INTERNAL_SERVER_ERROR.value(),
            "An unexpected error occurred",
            request.getDescription(false),
            LocalDateTime.now()
        );
        // Log the full exception for debugging
        ex.printStackTrace();
        return new ResponseEntity<>(error, HttpStatus.INTERNAL_SERVER_ERROR);
    }
}