package org.springblade.modules.parcel.util;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class JsonUtils {


	// 定义jackson对象
	private static final ObjectMapper MAPPER = new ObjectMapper();

	/**
	 * 将对象转换成json字符串。
	 * <p>Title: pojoToJson</p>
	 * <p>Description: </p>
	 * @param data
	 * @return
	 */
	public static String objectToJson(Object data) {
		try {
			String string = MAPPER.writeValueAsString(data);
			return string;
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 将json结果集转化为对象
	 *
	 * @param jsonData json数据
	 * @param beanType 对象中的object类型
	 * @return
	 */
	public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
		try {
			T t = MAPPER.readValue(jsonData, beanType);
			return t;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 将json数据转换成pojo对象list
	 * <p>Title: jsonToList</p>
	 * <p>Description: </p>
	 * @param jsonData
	 * @param beanType
	 * @return
	 */
	public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
		JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
		try {
			List<T> list = MAPPER.readValue(jsonData, javaType);
			return list;
		} catch (Exception e) {
			e.printStackTrace();
		}

		return null;
	}


	public static Map<String, Object> objectToMap(Object obj) throws Exception {
		if(obj == null)
			return null;

		Map<String, Object> map = new HashMap<String, Object>();

		BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
		PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
		for (PropertyDescriptor property : propertyDescriptors) {
			String key = property.getName();
			if (key.compareToIgnoreCase("class") == 0) {
				continue;
			}
			Method getter = property.getReadMethod();
			Object value = getter!=null ? getter.invoke(obj) : null;
			map.put(key, value);
		}

		return map;
	}

}