/*
 * 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.registry;

import com.fastasyncworldedit.core.extension.factory.parser.AliasedParser;
import com.sk89q.worldedit.WorldEdit;
import com.sk89q.worldedit.extension.input.InputParseException;
import com.sk89q.worldedit.extension.input.ParserContext;

import java.util.Locale;
import java.util.stream.Stream;

/**
 * An input parser that only performs a single function from aliases.
 *
 * @param <E> the element
 */
//FAWE start - AliasedParser interface, rather than method being here
public abstract class SimpleInputParser<E> extends InputParser<E> implements AliasedParser {
//FAWE end

    protected SimpleInputParser(WorldEdit worldEdit) {
        super(worldEdit);
    }

    @Override
    public E parseFromInput(String input, ParserContext context) throws InputParseException {
        if (!getMatchedAliases().contains(input)) {
            return null;
        }

        return parseFromSimpleInput(input, context);
    }

    public abstract E parseFromSimpleInput(String input, ParserContext context) throws InputParseException;

    /**
     * Gets the primary name of this matcher.
     *
     * @return the primary match
     */
    public String getPrimaryMatcher() {
        return getMatchedAliases().get(0);
    }

    @Override
    public Stream<String> getSuggestions(String input) {
        if (input.isEmpty()) {
            return Stream.of(getPrimaryMatcher());
        }
        final String prefix = input.toLowerCase(Locale.ROOT);
        for (String alias : getMatchedAliases()) {
            if (alias.startsWith(prefix)) {
                return Stream.of(alias);
            }
        }
        return Stream.empty();
    }

}
