/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q <http://www.sk89q.com>
 * Copyright (C) WorldEdit team and contributors
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package com.sk89q.worldedit.internal.expression;

import java.time.Instant;

import static java.util.Objects.requireNonNull;

public class ExecutionData {

    /**
     * Special execution context for evaluating constant values. As long as no variables are used,
     * it can be considered constant.
     */
    public static final ExecutionData CONSTANT_EVALUATOR = new ExecutionData(null, null, Instant.MAX);

    private final SlotTable slots;
    private final Functions functions;
    private final Instant deadline;

    public ExecutionData(SlotTable slots, Functions functions, Instant deadline) {
        this.slots = slots;
        this.functions = functions;
        this.deadline = deadline;
    }

    public SlotTable getSlots() {
        return requireNonNull(slots, "Cannot use variables in a constant");
    }

    public Functions getFunctions() {
        return requireNonNull(functions, "Cannot use functions in a constant");
    }

    public Instant getDeadline() {
        return deadline;
    }

    public void checkDeadline() {
        if (Instant.now().isAfter(deadline)) {
            throw new ExpressionTimeoutException("Calculations exceeded time limit.");
        }
    }

}
