package space.anyi.petServiceManagementSystem.server.config;

import org.springframework.dao.DuplicateKeyException;
import org.springframework.http.HttpStatus;
import org.springframework.validation.BindException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import space.anyi.petServiceManagementSystem.server.common.BusinessException;
import space.anyi.petServiceManagementSystem.server.common.ForbiddenException;
import space.anyi.petServiceManagementSystem.server.common.R;
import space.anyi.petServiceManagementSystem.server.common.ResourceNotFoundException;
import space.anyi.petServiceManagementSystem.server.common.UnauthorizedException;

import java.util.Objects;

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(BusinessException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public R<Void> handleBusinessException(BusinessException e) {
        return R.error(e.getCode(), e.getMessage());
    }

    @ExceptionHandler(UnauthorizedException.class)
    @ResponseStatus(HttpStatus.UNAUTHORIZED)
    public R<Void> handleUnauthorized(UnauthorizedException e) {
        return R.error(e.getCode(), e.getMessage());
    }

    @ExceptionHandler(ForbiddenException.class)
    @ResponseStatus(HttpStatus.FORBIDDEN)
    public R<Void> handleForbidden(ForbiddenException e) {
        return R.error(e.getCode(), e.getMessage());
    }

    @ExceptionHandler(ResourceNotFoundException.class)
    @ResponseStatus(HttpStatus.NOT_FOUND)
    public R<Void> handleNotFound(ResourceNotFoundException e) {
        return R.error(e.getCode(), e.getMessage());
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public R<Void> handleValidation(MethodArgumentNotValidException e) {
        String msg = Objects.requireNonNull(e.getBindingResult().getFieldError()).getDefaultMessage();
        return R.error(400, msg);
    }

    @ExceptionHandler(BindException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public R<Void> handleBindException(BindException e) {
        String msg = Objects.requireNonNull(e.getBindingResult().getFieldError()).getDefaultMessage();
        return R.error(400, msg);
    }

    @ExceptionHandler(MissingServletRequestParameterException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public R<Void> handleMissingParam(MissingServletRequestParameterException e) {
        return R.error(400, "缺少必填参数: " + e.getParameterName());
    }

    @ExceptionHandler(DuplicateKeyException.class)
    @ResponseStatus(HttpStatus.CONFLICT)
    public R<Void> handleDuplicateKey(DuplicateKeyException e) {
        return R.error(409, "数据重复，请检查唯一字段");
    }

    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public R<Void> handleException(Exception e) {
        e.printStackTrace();
        return R.error(500, "服务器内部错误");
    }
}