package net.minecraft.client.resources;

import com.google.common.base.Splitter;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.mojang.logging.LogUtils;
import java.io.BufferedReader;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.Map.Entry;
import net.minecraft.server.packs.linkfs.LinkFileSystem;
import net.minecraft.server.packs.linkfs.LinkFileSystem.Builder;
import net.minecraft.util.GsonHelper;
import org.slf4j.Logger;

public class IndexedAssetSource {
	private static final Logger LOGGER = LogUtils.getLogger();
	public static final Splitter PATH_SPLITTER = Splitter.on('/');

	public static Path createIndexFs(final Path assetsDirectory, final String index) {
		Path objectsDirectory = assetsDirectory.resolve("objects");
		Builder builder = LinkFileSystem.builder();
		Path indexFile = assetsDirectory.resolve("indexes/" + index + ".json");

		try {
			BufferedReader reader = Files.newBufferedReader(indexFile, StandardCharsets.UTF_8);

			try {
				JsonObject root = GsonHelper.parse(reader);
				JsonObject objects = GsonHelper.getAsJsonObject(root, "objects", null);
				if (objects != null) {
					for (Entry<String, JsonElement> entry : objects.entrySet()) {
						JsonObject object = (JsonObject)entry.getValue();
						String filename = (String)entry.getKey();
						List<String> path = PATH_SPLITTER.splitToList(filename);
						String hash = GsonHelper.getAsString(object, "hash");
						Path file = objectsDirectory.resolve(hash.substring(0, 2) + "/" + hash);
						builder.put(path, file);
					}
				}
			} catch (Throwable var16) {
				if (reader != null) {
					try {
						reader.close();
					} catch (Throwable var15) {
						var16.addSuppressed(var15);
					}
				}

				throw var16;
			}

			if (reader != null) {
				reader.close();
			}
		} catch (JsonParseException var17) {
			LOGGER.error("Unable to parse resource index file: {}", indexFile);
		} catch (IOException var18) {
			LOGGER.error("Can't open the resource index file: {}", indexFile);
		}

		return builder.build("index-" + index).getPath("/");
	}
}