package com.infoloop.tianting.config;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import java.io.IOException;
import java.time.Instant;
import java.time.format.DateTimeParseException;

@Configuration
public class JacksonConfig {

    @Bean
    public ObjectMapper objectMapper(Jackson2ObjectMapperBuilder builder) {
        final var objectMapper = builder.build();
        objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
        // 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
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 将不匹配的enum转为null，防止报错
        objectMapper.configure(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL, true);
        return objectMapper;
    }

    public static class JsonStringDeserializer extends JsonDeserializer<String> {
        @Override
        public String deserialize(JsonParser p, DeserializationContext context) throws IOException {
            JsonNode node = p.getCodec().readTree(p);
            return node.toString();
        }
    }

    public static class UtcTimeStringDeserializer extends JsonDeserializer<Instant> {
        @Override
        public Instant deserialize(JsonParser p, DeserializationContext context) throws IOException {
            try {
                return Instant.parse(p.getText());
            } catch (DateTimeParseException e) {
                return null;
            }
        }
    }
}