/**
 *   This file is part of Skript.
 *
 *  Skript is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Skript is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Skript.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Copyright 2011-2017 Peter Güttinger and contributors
 */
package ch.njol.skript.expressions;

import ch.njol.skript.Skript;
import ch.njol.skript.doc.Description;
import ch.njol.skript.doc.Examples;
import ch.njol.skript.doc.Name;
import ch.njol.skript.doc.Since;
import ch.njol.skript.lang.Expression;
import ch.njol.skript.lang.ExpressionType;
import ch.njol.skript.lang.SkriptParser;
import ch.njol.skript.lang.util.SimpleExpression;
import ch.njol.util.Kleenean;
import org.bukkit.event.Event;
import org.eclipse.jdt.annotation.Nullable;

@Name("Special Number")
@Description("Special number values, namely NaN, Infinity and -Infinity")
@Examples({"if {_number} is NaN value:"})
@Since("2.2-dev32d")
public class ExprSpecialNumber extends SimpleExpression<Number> {
	private int value;

	static {
		Skript.registerExpression(
			ExprSpecialNumber.class,
			Number.class,
			ExpressionType.SIMPLE, 
			"(0¦NaN|1¦[(2¦-|2¦minus)](infinity|\u221e)) value",
			"value of (0¦NaN|1¦[(2¦-|2¦minus)](infinity|\u221e))"
		);
	}

	@Override
	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, SkriptParser.ParseResult parseResult) {
		this.value = parseResult.mark;
		return true;
	}

	@Override
	protected Number[] get(Event e) {
		return new Number[]{value == 0 ? Double.NaN : value == 1 ? Double.POSITIVE_INFINITY : Double.NEGATIVE_INFINITY};
	}

	@Override
	public Class<? extends Number> getReturnType() {
		return Number.class;
	}

	@Override
	public boolean isSingle() {
		return true;
	}

	@Override
	public String toString(@Nullable Event e, boolean debug) {
		return value == 0 ? "NaN value" : value == 1 ? "infinity value" : "-infinity value";
	}
}
