package com.aigeo.common.exception;

import com.aigeo.common.Result;
import com.aigeo.common.enums.ResultCode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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 java.util.HashMap;
import java.util.Map;

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

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

    /**
     * 处理参数验证异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<Result<Map<String, String>>> handleValidationException(MethodArgumentNotValidException e) {
        log.error("参数验证异常: ", e);
        
        Map<String, String> errors = new HashMap<>();
        e.getBindingResult().getAllErrors().forEach((error) -> {
            String fieldName = ((FieldError) error).getField();
            String errorMessage = error.getDefaultMessage();
            errors.put(fieldName, errorMessage);
        });
        
        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
                .body(Result.error(ResultCode.BAD_REQUEST.getCode(), "参数验证失败", errors));
    }

    /**
     * 处理绑定异常
     */
    @ExceptionHandler(BindException.class)
    public ResponseEntity<Result<Map<String, String>>> handleBindException(BindException e) {
        log.error("绑定异常: ", e);
        
        Map<String, String> errors = new HashMap<>();
        e.getBindingResult().getAllErrors().forEach((error) -> {
            String fieldName = ((FieldError) error).getField();
            String errorMessage = error.getDefaultMessage();
            errors.put(fieldName, errorMessage);
        });
        
        return ResponseEntity.status(HttpStatus.BAD_REQUEST)
                .body(Result.error(ResultCode.BAD_REQUEST.getCode(), "参数绑定失败", errors));
    }

    /**
     * 处理其他异常
     */
    @ExceptionHandler(Exception.class)
    public ResponseEntity<Result<Void>> handleException(Exception e) {
        log.error("系统异常: ", e);
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body(Result.error(ResultCode.INTERNAL_SERVER_ERROR.getCode(), "系统异常，请联系管理员"));
    }
}