package xuan.exception;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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 xuan.common.ApiResponse;

import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import java.util.stream.Collectors;

@RestControllerAdvice
public class GlobalExceptionHandler {
    
    private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
    
    @ExceptionHandler(Exception.class)
    public ResponseEntity<ApiResponse<?>> handleException(Exception e) {
        logger.error("系统异常", e);
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
            .body(ApiResponse.error("系统繁忙，请稍后重试"));
    }
    
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ApiResponse<?>> handleValidation(MethodArgumentNotValidException e) {
        String message = e.getBindingResult().getFieldErrors().stream()
            .map(FieldError::getDefaultMessage)
            .collect(Collectors.joining(", "));
        logger.warn("参数验证失败: {}", message);
        return ResponseEntity.badRequest()
            .body(ApiResponse.error(message, 400));
    }
    
    @ExceptionHandler(ConstraintViolationException.class)
    public ResponseEntity<ApiResponse<?>> handleConstraintViolation(ConstraintViolationException e) {
        String message = e.getConstraintViolations().stream()
            .map(ConstraintViolation::getMessage)
            .collect(Collectors.joining(", "));
        logger.warn("参数验证失败: {}", message);
        return ResponseEntity.badRequest()
            .body(ApiResponse.error(message, 400));
    }
    
    @ExceptionHandler(IllegalArgumentException.class)
    public ResponseEntity<ApiResponse<?>> handleIllegalArgument(IllegalArgumentException e) {
        logger.warn("参数错误: {}", e.getMessage());
        return ResponseEntity.badRequest()
            .body(ApiResponse.error(e.getMessage(), 400));
    }
    
    @ExceptionHandler(RuntimeException.class)
    public ResponseEntity<ApiResponse<?>> handleRuntimeException(RuntimeException e) {
        logger.error("运行时异常", e);
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
            .body(ApiResponse.error("操作失败，请稍后重试"));
    }
}