package com.sunnyfarm.exception;
 
import com.sunnyfarm.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
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.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;
 
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import java.util.List;
import java.util.Set;
 
@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
    
    /**
     * 处理业务异常
     */
    @ExceptionHandler(BusinessException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<String> handleBusinessException(BusinessException e) {
        log.error("业务异常: {}", e.getMessage());
        return Result.error(e.getMessage());
    }
    
    /**
     * 处理参数校验异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<String> handleValidException(MethodArgumentNotValidException e) {
        List<FieldError> fieldErrors = e.getBindingResult().getFieldErrors();
        StringBuilder sb = new StringBuilder();
        for (FieldError error : fieldErrors) {
            sb.append(error.getField()).append(": ").append(error.getDefaultMessage()).append("; ");
        }
        log.error("参数校验异常: {}", sb.toString());
        return Result.error("参数校验失败: " + sb.toString());
    }
    
    /**
     * 处理绑定异常
     */
    @ExceptionHandler(BindException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<String> handleBindException(BindException e) {
        List<FieldError> fieldErrors = e.getBindingResult().getFieldErrors();
        StringBuilder sb = new StringBuilder();
        for (FieldError error : fieldErrors) {
            sb.append(error.getField()).append(": ").append(error.getDefaultMessage()).append("; ");
        }
        log.error("绑定异常: {}", sb.toString());
        return Result.error("参数绑定失败: " + sb.toString());
    }
    
    /**
     * 处理约束违反异常
     */
    @ExceptionHandler(ConstraintViolationException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<String> handleConstraintViolationException(ConstraintViolationException e) {
        Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
        StringBuilder sb = new StringBuilder();
        for (ConstraintViolation<?> violation : violations) {
            sb.append(violation.getMessage()).append("; ");
        }
        log.error("约束违反异常: {}", sb.toString());
        return Result.error("参数约束违反: " + sb.toString());
    }
    
    /**
     * 处理运行时异常
     */
    @ExceptionHandler(RuntimeException.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public Result<String> handleRuntimeException(RuntimeException e) {
        log.error("运行时异常", e);
        return Result.error("系统异常，请稍后重试");
    }
    
    /**
     * 处理其他异常
     */
    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public Result<String> handleException(Exception e) {
        log.error("系统异常", e);
        return Result.error("系统异常，请稍后重试");
    }
}