/*
 * 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.pattern;

import com.fastasyncworldedit.core.configuration.Caption;
import com.fastasyncworldedit.core.extension.factory.parser.AliasedParser;
import com.sk89q.worldedit.WorldEdit;
import com.sk89q.worldedit.command.util.SuggestionHelper;
import com.sk89q.worldedit.extension.input.InputParseException;
import com.sk89q.worldedit.extension.input.ParserContext;
import com.sk89q.worldedit.function.pattern.Pattern;
import com.sk89q.worldedit.function.pattern.RandomPattern;
import com.sk89q.worldedit.internal.registry.InputParser;
import com.sk89q.worldedit.util.formatting.text.TextComponent;
import com.sk89q.worldedit.world.block.BlockCategory;
import com.sk89q.worldedit.world.block.BlockType;

import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.stream.Stream;

//FAWE start - aliased
public class BlockCategoryPatternParser extends InputParser<Pattern> implements AliasedParser {
//FAWE end

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

    @Override
    public Stream<String> getSuggestions(String input) {
        return SuggestionHelper.getBlockCategorySuggestions(input, true);
    }

    @Override
    public Pattern parseFromInput(String input, ParserContext context) throws InputParseException {
        if (!input.startsWith("##")) {
            return null;
        }
        String tag = input.substring(2).toLowerCase(Locale.ROOT);
        boolean anyState = false;
        if (tag.startsWith("*")) {
            tag = tag.substring(1);
            anyState = true;
        }

        BlockCategory category = BlockCategory.REGISTRY.get(tag);
        if (category == null) {
            throw new InputParseException(Caption.of("worldedit.error.unknown-tag", TextComponent.of(tag)));
        }
        RandomPattern randomPattern = new RandomPattern();

        Set<BlockType> blocks = category.getAll();
        if (blocks.isEmpty()) {
            throw new InputParseException(Caption.of("worldedit.error.empty-tag", TextComponent.of(category.getId())));
        }

        if (anyState) {
            blocks.stream().flatMap(blockType -> blockType.getAllStates().stream()).forEach(state ->
                    randomPattern.add(state, 1.0));
        } else {
            for (BlockType blockType : blocks) {
                randomPattern.add(blockType.getDefaultState(), 1.0);
            }
        }

        return randomPattern;
    }

    //FAWE start - aliased
    @Override
    public List<String> getMatchedAliases() {
        return Collections.singletonList("##");
    }
    //FAWE end

}
