package net.minecraft.server.packs;

import java.io.IOException;
import java.io.InputStream;
import net.minecraft.server.packs.metadata.MetadataSectionType;
import net.minecraft.server.packs.resources.IoSupplier;
import net.minecraft.server.packs.resources.ResourceMetadata;
import org.jspecify.annotations.Nullable;

public abstract class AbstractPackResources implements PackResources {
	private final PackLocationInfo location;
	private @Nullable ResourceMetadata metadata;

	protected AbstractPackResources(final PackLocationInfo location) {
		this.location = location;
	}

	@Override
	public <T> @Nullable T getMetadataSection(final MetadataSectionType<T> metadataSerializer) throws IOException {
		if (this.metadata == null) {
			this.metadata = loadMetadata(this);
		}

		return this.metadata.getSection(metadataSerializer).orElse(null);
	}

	public static ResourceMetadata loadMetadata(final PackResources packResources) throws IOException {
		IoSupplier<InputStream> metadata = packResources.getRootResource("pack.mcmeta");
		if (metadata == null) {
			return ResourceMetadata.EMPTY;
		}

		try (InputStream resource = metadata.get()) {
			return ResourceMetadata.fromJsonStream(resource);
		}
	}

	@Override
	public PackLocationInfo location() {
		return this.location;
	}
}