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package com.sportdataapi.util;

import java.io.IOException;
import java.time.Instant;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalAccessor;
import java.util.Calendar;
import java.util.TimeZone;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;

import rs.baselib.util.RsDate;
import rs.baselib.util.RsDay;

/**
 * Helps Jackson to deserialize a date.
 * @author ralph
 *
 */
public class RsDateDeserializer extends JsonDeserializer {

	/**
	 * Constructor.
	 */
	public RsDateDeserializer() {
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public RsDate deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
		JsonNode node     = p.readValueAsTree();
		if (!node.isNull()) {
			String value      = node.asText();
			if (value.length() == 19) {
				RsDay day     = RsDay.getDay(value.substring(0, 4)+value.substring(5, 7)+value.substring(8, 10));
				RsDate rc     = day.getBegin();
				rc.setTimeZone(TimeZone.getTimeZone("UTC"));
				rc.add(Calendar.HOUR_OF_DAY, Integer.valueOf(value.substring(11,13)));
				rc.add(Calendar.MINUTE,      Integer.valueOf(value.substring(14,16)));
				return rc;
			} else {
				// 2020-09-23T23:11:10.000000Z
				TemporalAccessor ta = DateTimeFormatter.ISO_INSTANT.parse(value);
				return new RsDate(Instant.from(ta).getLong(ChronoField.INSTANT_SECONDS));
			}
		}
		return null;
	}


}