package com.fasterxml.jackson.dataformat.avro.jsr310.deser;

import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.temporal.Temporal;
import java.util.function.BiFunction;

Deserializer for variants of java.time classes (Instant, OffsetDateTime, ZonedDateTime) from an integer value.
Deserialized value represents an instant on the global timeline, independent of a particular time zone or
calendar, with a precision of one millisecond from the unix epoch, 1 January 1970 00:00:00.000 UTC.
Time zone information is lost at serialization. Time zone data types receives time zone from deserialization context.
Deserialization from string is not supported.
Type parameters:
<T> – The type of a instant class that can be deserialized./**
 * Deserializer for variants of java.time classes (Instant, OffsetDateTime, ZonedDateTime) from an integer value.
 *
 * Deserialized value represents an instant on the global timeline, independent of a particular time zone or
 * calendar, with a precision of one millisecond from the unix epoch, 1 January 1970 00:00:00.000 UTC.
 * Time zone information is lost at serialization. Time zone data types receives time zone from deserialization context.
 *
 * Deserialization from string is not supported.
 *
 * @param <T> The type of a instant class that can be deserialized.
 */
public class AvroInstantDeserializer<T extends Temporal> extends AvroJavaTimeDeserializerBase <T> {

    private static final long serialVersionUID = 1L;

    public static final AvroInstantDeserializer<Instant> INSTANT =
            new AvroInstantDeserializer<>(Instant.class, (instant, zoneID) -> instant);

    public static final AvroInstantDeserializer<OffsetDateTime> OFFSET_DATE_TIME =
            new AvroInstantDeserializer<>(OffsetDateTime.class, OffsetDateTime::ofInstant);

    public static final AvroInstantDeserializer<ZonedDateTime> ZONED_DATE_TIME =
            new AvroInstantDeserializer<>(ZonedDateTime.class, ZonedDateTime::ofInstant);

    protected final BiFunction<Instant, ZoneId, T> fromInstant;

    protected AvroInstantDeserializer(Class<T> supportedType, BiFunction<Instant, ZoneId, T> fromInstant) {
        super(supportedType);
        this.fromInstant = fromInstant;
    }

    @Override
    protected T fromLong(long longValue, ZoneId defaultZoneId) {
        /**
         * Number of milliseconds, independent of a particular time zone or calendar,
         * from 1 January 1970 00:00:00.000 UTC.
         */
        return fromInstant.apply(Instant.ofEpochMilli(longValue), defaultZoneId);
    }

}