/*
 * 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.command.util;

import com.google.common.collect.ImmutableSet;
import org.enginehub.piston.Command;
import org.enginehub.piston.gen.CommandConditionGenerator;
import org.enginehub.piston.util.NonnullByDefault;

import java.lang.reflect.Method;
import java.util.Set;

import static com.google.common.base.Preconditions.checkNotNull;

@NonnullByDefault
public final class CommandPermissionsConditionGenerator implements CommandConditionGenerator {

    public interface Registration {

        Registration commandPermissionsConditionGenerator(CommandPermissionsConditionGenerator generator);

    }

    @Override
    public Command.Condition generateCondition(Method commandMethod) {
        CommandPermissions annotation = commandMethod.getAnnotation(CommandPermissions.class);
        checkNotNull(annotation, "Annotation is missing from commandMethod");
        Set<String> permissions = ImmutableSet.copyOf(annotation.value());
        return new PermissionCondition(permissions, annotation.queued());
    }

}
