package com.designhub.exception;

import com.designhub.common.Result;
import com.designhub.common.ResultCode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.validation.BindException;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;

import java.util.stream.Collectors;

/**
 * 全局异常处理器
 */
@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {

    /**
     * 处理业务异常
     */
    @ExceptionHandler(BusinessException.class)
    public Result<?> handleBusinessException(BusinessException e) {
        log.error("业务异常：{}", e.getMessage());
        return Result.error(e.getCode(), e.getMessage());
    }

    /**
     * 处理参数校验异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public Result<?> handleValidException(MethodArgumentNotValidException e) {
        String message = e.getBindingResult().getFieldErrors()
                .stream()
                .map(FieldError::getDefaultMessage)
                .collect(Collectors.joining(", "));
        log.error("参数校验失败：{}", message);
        return Result.error(ResultCode.BAD_REQUEST.getCode(), message);
    }

    /**
     * 处理绑定异常
     */
    @ExceptionHandler(BindException.class)
    public Result<?> handleBindException(BindException e) {
        String message = e.getFieldErrors()
                .stream()
                .map(FieldError::getDefaultMessage)
                .collect(Collectors.joining(", "));
        log.error("参数绑定失败：{}", message);
        return Result.error(ResultCode.BAD_REQUEST.getCode(), message);
    }

    /**
     * 处理参数类型不匹配异常
     */
    @ExceptionHandler(MethodArgumentTypeMismatchException.class)
    public Result<?> handleTypeMismatchException(MethodArgumentTypeMismatchException e) {
        log.error("参数类型不匹配：{}", e.getMessage());
        return Result.error(ResultCode.BAD_REQUEST.getCode(), "参数类型错误");
    }

    /**
     * 处理IllegalArgumentException
     */
    @ExceptionHandler(IllegalArgumentException.class)
    public Result<?> handleIllegalArgumentException(IllegalArgumentException e) {
        log.error("非法参数异常：{}", e.getMessage());
        return Result.error(ResultCode.BAD_REQUEST.getCode(), e.getMessage());
    }

    /**
     * 处理其他所有异常
     */
    @ExceptionHandler(Exception.class)
    public Result<?> handleException(Exception e) {
        log.error("系统异常：", e);
        return Result.error(ResultCode.ERROR.getCode(), "系统异常，请联系管理员");
    }
}