package cryptosky.me.helpers;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;

public class Utils {

    // Utility Function to be able to get one of all types
    public static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) {
        Map<Object, Boolean> seen = new ConcurrentHashMap<>();
        return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
    }

    public static LocalDateTime format(String T) {
        DateTimeFormatter F = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssXXX")
                .withZone(ZoneId.of("UTC"));
        return LocalDateTime.parse(T, F);
    }
}