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/*
 * Copyright (C) 2016 All rights reserved
 * VPRO The Netherlands
 */
package nl.vpro.jackson2;

import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
import java.time.Instant;
import java.util.Optional;

import jakarta.xml.bind.DatatypeConverter;

import org.slf4j.event.Level;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;

import nl.vpro.logging.Slf4jHelper;

/**
 * These can be used in conjunction with InstantXmlAdapter, if you want 'millis since epoch' in JSON, but formatted date stamps in xml.
 * (this is what we normally do)
 * @author Michiel Meeuwissen
 * @since 0.39
 */
@Slf4j
public class StringInstantToJsonTimestamp {

    private static boolean warnedNatty = false;

    private StringInstantToJsonTimestamp() {}

    public static class Serializer extends JsonSerializer {
        public static final StringInstantToJsonTimestamp.Serializer INSTANCE = new StringInstantToJsonTimestamp.Serializer();

        @Override
        public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
            if (value == null) {
                jgen.writeNull();
            } else if (value instanceof Instant) { // if no JaxbAnnotationIntrospector
                jgen.writeNumber(((Instant) value).toEpochMilli());
            } else if (value instanceof CharSequence) {
                try {
                    jgen.writeNumber(parseDateTime(String.valueOf(value)).toEpochMilli());
                } catch (IllegalArgumentException iae) {
                    log.warn("Could not parse {}. Writing null to json", value);
                    jgen.writeNull();
                }
            }
        }
    }

    static Instant parseDateTime(String value) {
        try {
            long asLong = Long.parseLong(value);
            return Instant.ofEpochMilli(asLong);
        } catch (NumberFormatException ignore) {
        }
        try {
            return DatatypeConverter.parseTime(value).toInstant();
        } catch (IllegalArgumentException iae) {
            try {
                Optional natty = NattySupport.parseDate(value);
                if (natty.isPresent()) {
                    return natty.get();
                } else {
                    log.debug("Natty didn't match");
                }
            } catch (NoClassDefFoundError classNotFoundException) {
                Slf4jHelper.log(log, warnedNatty ? Level.DEBUG : Level.WARN, "No natty?: " + classNotFoundException.getMessage());
                warnedNatty  = true;
            } catch (Throwable e) {
                log.debug("Natty couldn't parse {}: {}", value, e.getMessage());
            }
            throw iae;
        }
    }

    public static class Deserializer extends JsonDeserializer {

        public static final StringInstantToJsonTimestamp.Deserializer INSTANCE = new StringInstantToJsonTimestamp.Deserializer();

        @Override
        public Instant deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
            switch (jp.currentTokenId()) {
                case JsonTokenId.ID_NUMBER_INT -> {
                    return Instant.ofEpochMilli(jp.getLongValue());
                }
                case JsonTokenId.ID_NULL -> {
                    return null;
                }
                case JsonTokenId.ID_STRING -> {
                    try {
                        return parseDateTime(jp.getText());
                    } catch (IllegalArgumentException iae) {
                        log.warn("Could not parse {}. Writing null to json", jp.getText());
                        return null;
                    }
                }
                default -> {
                    log.warn("Could not parse {} to instant. Returning null", jp.toString());
                    return null;
                }
            }
        }
    }
}
    

    

    

            

    

            



    
    






    
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