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package com.github.wendao76.util;


import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;

import java.io.IOException;
import java.io.InputStream;
import java.util.TimeZone;

/**
 * 
 * 
 *
 * @author wendao76 .
 * @version 1.0.0.
 */
public class LrsJsonMapper {
    private static ObjectMapper mapper;

    static {
        mapper = new ObjectMapper();
        // 设置将驼峰命名法转换成下划线的方式输入输出
        mapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);

        //设置时区
        mapper.setTimeZone(TimeZone.getDefault());
        // 设置时间为 ISO-8601 日期
        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        mapper.configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
        mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
        // 序列化BigDecimal时之间输出原始数字还是科学计数，默认false，即是否以toPlainString()科学计数方式来输出
        mapper.configure(SerializationFeature.WRITE_BIGDECIMAL_AS_PLAIN, false);
        //允许单引号
        //mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        //设定是否使用Enum的toString函数来读取Enum, 为False时使用Enum的name()函数来读取Enum,
        mapper.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);
        // 如果输入不存在的字段时不会报错
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        // 使用默认的Jsckson注解
        mapper.setAnnotationIntrospector(new JacksonAnnotationIntrospector());
    }

    /**
     * Gets mapper.
     *
     * @return the mapper
     */
    public static ObjectMapper getMapper() {
        return mapper;
    }

    /**
     * Sets mapper.
     *
     * @param mapper the mapper
     */
    public static void setMapper(ObjectMapper mapper) {
        LrsJsonMapper.mapper = mapper;
    }

    /**
     * Parse t.
     *
     * @param         the type parameter
     * @param json       the json
     * @param objectType the object type
     * @return the t
     * @throws IOException the io exception
     */
    public static  T parse(String json, Class objectType) throws IOException {
        if (json == null)
            return null;
        return mapper.readValue(json, objectType);
    }

    /**
     * Parse t.
     *
     * @param         the type parameter
     * @param stream     the stream
     * @param objectType the object type
     * @return the t
     * @throws IOException the io exception
     */
    public static  T parse(InputStream stream, Class objectType) throws IOException {
        return mapper.readValue(stream, objectType);
    }

    /**
     * To json string.
     *
     * @param obj the obj
     * @return the string
     * @throws IOException the io exception
     */
    public static String toJson(Object obj) throws IOException {
        return mapper.writeValueAsString(obj);
    }
}