package net.minecraft.server.packs.resources;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Optional;
import net.minecraft.resources.ResourceLocation;

@FunctionalInterface
public interface ResourceProvider {
	ResourceProvider EMPTY = resourceLocation -> Optional.empty();

	Optional<Resource> getResource(ResourceLocation location);

	default Resource getResourceOrThrow(ResourceLocation resourceLocation) throws FileNotFoundException {
		return (Resource)this.getResource(resourceLocation).orElseThrow(() -> new FileNotFoundException(resourceLocation.toString()));
	}

	default InputStream open(ResourceLocation resourceLocation) throws IOException {
		return this.getResourceOrThrow(resourceLocation).open();
	}

	default BufferedReader openAsReader(ResourceLocation resourceLocation) throws IOException {
		return this.getResourceOrThrow(resourceLocation).openAsReader();
	}

	static ResourceProvider fromMap(Map<ResourceLocation, Resource> map) {
		return resourceLocation -> Optional.ofNullable((Resource)map.get(resourceLocation));
	}
}