package com.r11.tools.controller;

import java.util.ArrayList;
import java.util.List;
import javax.validation.ConstraintViolationException;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.BindException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;


/**
 * Custom exception handler for {@link ConstraintViolationException}
 * @author Rafał Żukowicz
 */
@ControllerAdvice
public class MvcExceptionHandler {

    /**
     * Provides handling for {@link ConstraintViolationException}
     * @param e exception argument
     * @return response with error list and status 400 bad request
     */
    @ExceptionHandler(ConstraintViolationException.class)
    public ResponseEntity<List> validationErrorHandler(ConstraintViolationException e){
        List<String> errors = new ArrayList<>(e.getConstraintViolations().size());

        e.getConstraintViolations().forEach(constraintViolation -> {
            errors.add(constraintViolation.getPropertyPath() + " : " + constraintViolation.getMessage());
        });
        return new ResponseEntity<>(errors, HttpStatus.BAD_REQUEST);
    }

    /**
     * Provides handling for {@link BindException}
     * @param ex exception argument
     * @return response with error list and status 400 bad request
     */
    @ExceptionHandler(BindException.class)
    public ResponseEntity<List> handleBindException(BindException ex){
        return new ResponseEntity(ex.getAllErrors(), HttpStatus.BAD_REQUEST);
    }

}


