package com.jilongda.common.config;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.deser.std.DateDeserializers;
import com.fasterxml.jackson.databind.ser.std.DateSerializer;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.Objects;

/**
 * @author xiaochen
 * @ClassName LocalDateTimeSerializerConfig
 * @Description
 * @date 2020-09-22 11:22
 */
@Configuration
public class JacksonConfig {
    public static final String dateFormat = "yyyy-MM-dd";
    public static final String dateTimeFormat = "yyyy-MM-dd HH:mm:ss";


    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
        return builder -> {
            // Long型精度丢失问题
            builder.serializerByType(Long.TYPE, ToStringSerializer.instance);
            builder.serializerByType(Long.class, ToStringSerializer.instance);
            // 时间格式化
            builder.simpleDateFormat(dateTimeFormat);
            builder.serializers(new LocalDateSerializer(DateTimeFormatter.ofPattern(dateFormat)));
            builder.serializers(new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(dateTimeFormat)));
            // builder.serializers(new CustomDateSerializer());
            //builder.deserializers(new CustomDateDeSerializer());
            builder.deserializers(new LocalDateDeserializer(DateTimeFormatter.ofPattern(dateFormat)));
            builder.deserializers(new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(dateTimeFormat)));
        };
    }

    static class CustomDateDeSerializer extends DateDeserializers.DateDeserializer {
        SimpleDateFormat format = new SimpleDateFormat(dateTimeFormat);

        @Override
        public Date deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
            if (p != null) {
                String time = p.getText();
                if (StringUtils.hasLength(time)) {
                    try {
                        return format.parse(time);
                    } catch (ParseException e) {
                        return null;
                    }
                }
            }
            return super.deserialize(p, ctxt);
        }
    }

    class CustomDateSerializer extends DateSerializer {
        @Override
        public void serialize(Date value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
            if (Objects.nonNull(value)) {
                SimpleDateFormat format = new SimpleDateFormat(dateTimeFormat);
                jgen.writeString(format.format(value));
            }
        }
    }
}