package com.jilongda.common.utils;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.jilongda.common.config.JacksonConfig;
import com.jilongda.common.exception.ServerException;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * Json转换工具类
 * 参考：https://blog.csdn.net/weixin_38413579/article/details/82562634
 *
 * @author madman
 */
@Slf4j
public final class JsonUtils {

    private static final ObjectMapper OM = new ObjectMapper();
    private static final JavaTimeModule timeModule = new JavaTimeModule();

    /**
     * 设置 ObjectMapper
     *
     * @return
     */
    private static ObjectMapper getObjectMapper() {
        // 序列化
        timeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
        timeModule.addSerializer(LocalDate.class, new LocalDateSerializer());
        // 反序列化
        timeModule.addDeserializer(LocalDateTime.class,
                new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(JacksonConfig.dateTimeFormat)));
        timeModule.addDeserializer(LocalDate.class,
                new LocalDateDeserializer(DateTimeFormatter.ofPattern(JacksonConfig.dateFormat)));
        // 允许对象忽略json中不存在的属性
        OM.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        OM.registerModule(timeModule);
        return OM;
    }

    /**
     * 将对象序列化
     */
    public static <T> String toJsonString(T obj) {
        try {
            ObjectMapper om = getObjectMapper();
            return om.writeValueAsString(obj);
        } catch (JsonProcessingException e) {
            log.error("转json字符串失败：{}", obj);
            e.printStackTrace();
            throw new ServerException("转json字符串失败");
        }
    }

    /**
     * 反序列化对象字符串
     */
    public static <T> T parseObject(String json, Class<T> clazz) {
        try {
            ObjectMapper om = getObjectMapper();
            return om.readValue(json, clazz);
        } catch (JsonProcessingException e) {
            throw new ServerException("反序列化对象字符串失败");
        }
    }

    /**
     * 反序列化字符串成为对象
     */
    public static <T> T parseObject(String json, TypeReference<T> valueTypeRef) {
        try {
            ObjectMapper om = getObjectMapper();
            return om.readValue(json, valueTypeRef);
        } catch (JsonProcessingException e) {
            throw new ServerException("反序列化字符串成为对象失败");
        }
    }

    /**
     * 转换LocalDateTime
     */
    static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
        @Override
        public void serialize(LocalDateTime localDateTime, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
            jsonGenerator.writeString(localDateTime.format(DateTimeFormatter.ofPattern(JacksonConfig.dateTimeFormat)));
        }
    }

    /**
     * 转换LocalDate
     */
    static class LocalDateSerializer extends JsonSerializer<LocalDate> {
        @Override
        public void serialize(LocalDate localDate, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
            jsonGenerator.writeString(localDate.format(DateTimeFormatter.ofPattern(JacksonConfig.dateFormat)));
        }
    }

}