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package org.jmmo.tuple;

import java.util.Comparator;
import java.util.Iterator;
import java.util.Objects;
import java.util.function.Consumer;
import java.util.function.Function;

public class Tuple1 implements Tuple, Comparable> {
    private static final long serialVersionUID = -8854900772811744378L;

    private final T0 value0;

    protected Tuple1(T0 value0) {
        this.value0 = value0;
    }

    public static  Tuple1 of(V0 v0) {
        return new Tuple1<>(v0);
    }

    @SuppressWarnings("unchecked")
    public static  Tuple1 fromArray(A[] values) {
        return new Tuple1<>((V) values[0]);
    }

    public static  Tuple1 fromIterator(Iterator iterator) {
        return new Tuple1<>(iterator.next());
    }

    public void unfold(Consumer valueConsumer) {
        valueConsumer.accept(getValue0());
    }

    public  R unfoldResult(Function valueFunction) {
        return valueFunction.apply(getValue0());
    }

    public T0 getValue0() {
        return value0;
    }

    @Override public int getSize() {
        return 1;
    }

    @SuppressWarnings("unchecked")
    @Override public  E get(int i) {
        if (i == 0) {
            return (E) getValue0();
        }

        throw new IndexOutOfBoundsException("Tuple1 contains one element but " + i + " element requested");
    }

    @Override public Object[] toArray() {
        return new Object[] { getValue0() };
    }

    protected static final Comparator> nullComparator = Comparator.nullsFirst(Comparator.naturalOrder());

    @SuppressWarnings("unchecked")
    @Override public int compareTo(Tuple1 o) {
        return nullComparator.compare((Comparable) this.getValue0(), (Comparable) o.getValue0());
    }

    @Override public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Tuple1)) return false;
        Tuple1 tuple1 = (Tuple1) o;
        return Objects.deepEquals(getValue0(), tuple1.getValue0());
    }

    @Override public int hashCode() {
        return Tuple.hashCode(this);
    }

    @Override public String toString() {
        return Tuple.toString(this);
    }
}