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Blazingly fast Minecraft world manipulation for artists, builders and everyone else.

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package com.fastasyncworldedit.core.util;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.sk89q.jnbt.CompoundTag;
import com.sk89q.jnbt.StringTag;
import com.sk89q.jnbt.Tag;
import com.sk89q.worldedit.LocalSession;
import com.sk89q.worldedit.blocks.BaseItem;
import com.sk89q.worldedit.command.tool.BrushTool;
import com.sk89q.worldedit.entity.Player;

import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;

public final class BrushCache {

    private static final WeakHashMap brushCache = new WeakHashMap<>();
    private static final Gson gson = new GsonBuilder().setPrettyPrinting().create();

    private static CompoundTag getNBT(BaseItem item) {
        return item.hasNbtData() ? item.getNbtData() : null;
    }

    private static Object getKey(BaseItem item) {
        return item.getNativeItem();
    }

    private static final ThreadLocal RECURSION = new ThreadLocal<>();

    public static BrushTool getTool(Player player, LocalSession session, BaseItem item) {
        if (!item.hasNbtData()) {
            return null;
        }
        Object key = getKey(item);
        if (key == null) {
            return null;
        }
        BrushTool cached = brushCache.get(key);
        if (cached != null) {
            return cached;
        }

        CompoundTag nbt = item.getNbtData();
        if (nbt == null) {
            return null;
        }
        StringTag json = (StringTag) nbt.getValue().get("weBrushJson");
        // TODO: Write a Brush standard format
        /* if (json != null) {
            try {
                if (RECURSION.get() != null) return null;
                RECURSION.set(true);

                BrushTool tool = BrushTool.fromString(player, session, json.getValue());
                tool.setHolder(item);
                brushCache.put(key, tool);
                return tool;
            } catch (Exception throwable) {
                getLogger(BrushCache.class).debug("Invalid brush for " + player + " holding " + item.getType() + ": " + json.getValue(), throwable);
                item.setNbtData(null);
                brushCache.remove(key);
            } finally {
                RECURSION.remove();
            }
        }*/
        return null;
    }

    public static BrushTool getCachedTool(BaseItem item) {
        Object key = getKey(item);
        if (key != null) {
            return brushCache.get(key);
        }
        return null;
    }

    public static BrushTool setTool(BaseItem item, BrushTool tool) {
        if (item.getNativeItem() == null) {
            return null;
        }

        CompoundTag nbt = item.getNbtData();
        Map map;
        if (nbt == null) {
            if (tool == null) {
                item.setNbtData(null);
                return tool;
            }
            nbt = new CompoundTag(map = new HashMap<>());
        } else {
            map = nbt.getValue();
        }
        brushCache.remove(getKey(item));
        CompoundTag display = (CompoundTag) map.get("display");
        Map displayMap;
        return tool;
    }

}