/*
 * 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.extension.factory.parser.mask;

import com.fastasyncworldedit.core.extension.factory.parser.AliasedParser;
import com.google.common.collect.ImmutableList;
import com.sk89q.worldedit.WorldEdit;
import com.sk89q.worldedit.extension.input.ParserContext;
import com.sk89q.worldedit.function.mask.Mask;
import com.sk89q.worldedit.function.mask.NoiseFilter;
import com.sk89q.worldedit.internal.registry.InputParser;
import com.sk89q.worldedit.math.noise.RandomNoise;

import java.util.List;
import java.util.stream.Stream;

//FAWE start - aliased
public class NoiseMaskParser extends InputParser<Mask> implements AliasedParser {

    private final List<String> aliases = ImmutableList.of("%");
    //FAWE end

    public NoiseMaskParser(WorldEdit worldEdit) {
        super(worldEdit);
    }

    @Override
    public Stream<String> getSuggestions(String input) {
        if (input.isEmpty()) {
            return Stream.of("%");
        }
        if (input.charAt(0) != '%') {
            return Stream.empty();
        }
        return Stream.of("%10", "%25", "%50", "%75").filter(s -> s.startsWith(input));
    }

    @Override
    public Mask parseFromInput(String input, ParserContext context) {
        if (!input.startsWith("%")) {
            return null;
        }

        //FAWE start - richer parsing
        if (input.charAt(1) == '[') {
            int end = input.lastIndexOf(']');
            if (end == -1) {
                return null;
            }
            input = input.substring(2, end);
        } else {
            input = input.substring(1);
        }

        int i = Integer.parseInt(input);
        //FAWE end

        return new NoiseFilter(new RandomNoise(), ((double) i) / 100);
    }

    //FAWE start - aliased
    @Override
    public List<String> getMatchedAliases() {
        return aliases;
    }
    //FAWE end

}
