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package jedi.option;

import jedi.functional.*;

import java.util.Iterator;
import java.util.List;

import static java.util.Collections.singletonList;
import static jedi.assertion.Assert.assertNotNull;
import static jedi.option.Options.some;

/**
 * Some represents a value of type T that exists.
 */
public final class Some implements Option {

    public static final long serialVersionUID = 1L;

	private final T value;

	public Some(T value) {
		assertNotNull(value, "Some value cannot be null, use None instead");
		this.value = value;
	}

	public List asList() {
		return singletonList(get());
	}

	public T getOrElse(Functor0 generator) {
		return get();
	}

	public T getOrElse(T defaultValue) {
		return get();
	}

	/**
	 * Get the value this Some contains.
	 * 
	 * @return the value, guaranteed to not be null.
	 */
	public T get() {
		return value;
	}

	public void match(OptionMatcher matcher) {
		assertNotNull(matcher, "OptionMatcher must not be null");
		matcher.caseSome(value);
	}

	public void match(Command someCommand, Command0 noneCommand) {
		someCommand.execute(get());
	}

	public  R1 match(Functor someFunctor, Functor0 noneFunctor) {
		return someFunctor.execute(get());
	}

	public  Option map(Functor mappingFunction) {
		R result = mappingFunction.execute(get());
		return result == null ? Options.none() : some(result);
	}

	public  Option flatMap(Functor> mappingFunction) {
		return mappingFunction.execute(get());
	}

	@Override
	public boolean equals(Object obj) {
		return obj instanceof Some && get().equals(((Some) obj).get());
	}

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

	@Override
	public String toString() {
		return "Some: " + get();
	}

	public void forEach(Command command) {
		command.execute(get());
	}

	public Option filter(Filter f) {
		return f.execute(get()) ? this : Options. none();
	}

	public Iterator iterator() {
		return asList().iterator();
	}

	public T unsafeGet() {
		return value;
	}
}