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package com.naharoo.commons.mstoolkit.rest.exceptionhandler;

import com.naharoo.commons.mstoolkit.exceptions.CommonIssueType;
import com.naharoo.commons.mstoolkit.exceptions.IssueType;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
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 javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import static java.util.Collections.singleton;

@ControllerAdvice
@ConditionalOnProperty(prefix = "ms-toolkit.rest-exception-handler.handlers.enabled", name = "DATA_INTEGRITY_CONSTRAINT_VIOLATED", havingValue = "true", matchIfMissing = true)
@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.SERVLET)
@ConditionalOnClass(name = "org.springframework.web.bind.MethodArgumentNotValidException")
public class MethodArgumentNotValidExceptionHandler extends AbstractExceptionHandler {

  /**
   * Handle MethodArgumentNotValidException. Thrown when an object fails @Valid validation.
   */
  @ExceptionHandler(MethodArgumentNotValidException.class)
  public ResponseEntity handle(
          final MethodArgumentNotValidException exception,
          final HttpServletRequest request
  ) {
    final HttpServletRequestInfoBuilder infoBuilder = HttpServletRequestInfoBuilder.newInstance(
            request);
    logTrace(exception, infoBuilder);

    final IssueType type = CommonIssueType.DATA_INTEGRITY_CONSTRAINT_VIOLATED;
    final int statusCode = type.statusCode();

    final List messages = exception
            .getBindingResult()
            .getAllErrors()
            .stream()
            .filter(Objects::nonNull)
            .map(error -> {
              if (error instanceof FieldError) {
                return String.format(
                        "%s.%s: %s",
                        error.getObjectName(),
                        ((FieldError) error).getField(),
                        error.getDefaultMessage()
                );
              }

              return String.format("%s: %s", error.getObjectName(), error.getDefaultMessage());
            })
            .collect(Collectors.toList());

    final ResponseEntity response = ResponseEntity
            .status(statusCode)
            .body(new ApiErrorResponse(
                    statusCode,
                    singleton(type),
                    messages,
                    LocalDateTime.now()
            ));

    logInfo(exception, infoBuilder);
    return response;
  }
}