package com.tianting.infoloop.utils;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

import java.io.IOException;
import java.util.List;

public final class JSONUtil {
    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    static {
        final SimpleModule module  = new SimpleModule();
        module.addSerializer(Long.class, ToStringSerializer.instance);
        module.addSerializer(long.class, ToStringSerializer.instance);
        OBJECT_MAPPER.registerModule(module);
        // 如果json中有新增的字段并且是实体类类中不存在的，不报错
        OBJECT_MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 序列化时忽略值为null的属性
        OBJECT_MAPPER.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    }

    public static String writeAsJson(final Object object) {
        try {
            return OBJECT_MAPPER.writeValueAsString(object);
        } catch (final JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T readJsonAs(final String json, final Class<T> clazz) {
        try {
            return OBJECT_MAPPER.readerFor(clazz).readValue(json);
        } catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> List<T> readJsonAsList(String jsonString, Class<T> clazz) {
        try {
            return OBJECT_MAPPER.readValue(jsonString, new TypeReference<>() {
            });
        } catch (Exception e) {
            throw new RuntimeException("Failed to convert JSON to List<" + clazz.getSimpleName() + ">", e);
        }
    }

    public static <T> JsonNode readTree(final String json) {
        try {
            return OBJECT_MAPPER.readTree(json);
        } catch (final IOException e) {
            throw new RuntimeException(e);
        }
    }
    private JSONUtil() {}
}