/*
 * This file is part of fabric-loom, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2022 FabricMC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package net.fabricmc.loom.configuration.mods;

import java.io.IOException;
import java.nio.file.Path;
import java.util.List;

import org.objectweb.asm.commons.Remapper;

import net.fabricmc.accesswidener.AccessWidenerReader;
import net.fabricmc.accesswidener.AccessWidenerRemapper;
import net.fabricmc.accesswidener.AccessWidenerWriter;
import net.fabricmc.loom.api.mappings.layered.MappingsNamespace;
import net.fabricmc.loom.util.ModPlatform;
import net.fabricmc.loom.util.fmj.FabricModJson;
import net.fabricmc.loom.util.fmj.FabricModJsonFactory;
import net.fabricmc.loom.util.fmj.ModMetadataFabricModJson;

public class AccessWidenerUtils {
	/**
	 * Remap a mods access widener from intermediary to named, so that loader can apply it in our dev-env.
	 */
	public static byte[] remapAccessWidener(byte[] input, Remapper remapper) {
		int version = AccessWidenerReader.readVersion(input);

		AccessWidenerWriter writer = new AccessWidenerWriter(version);
		AccessWidenerRemapper awRemapper = new AccessWidenerRemapper(
				writer,
				remapper,
				MappingsNamespace.INTERMEDIARY.toString(),
				MappingsNamespace.NAMED.toString()
		);
		AccessWidenerReader reader = new AccessWidenerReader(awRemapper);
		reader.read(input);
		return writer.write();
	}

	public static AccessWidenerData readAccessWidenerData(Path inputJar, ModPlatform platform) throws IOException {
		if (!FabricModJsonFactory.isModJar(inputJar, platform)) {
			return null;
		}

		final FabricModJson fabricModJson = FabricModJsonFactory.createFromZip(inputJar);

		if (platform.isForgeLike() && !(fabricModJson instanceof ModMetadataFabricModJson)) {
			// Ignore actual fabric.mod.json files on NeoForge and Forge.
			// See https://github.com/architectury/architectury-loom/issues/165.
			return null;
		}

		final List<String> classTweakers = List.copyOf(fabricModJson.getClassTweakers().keySet());

		if (classTweakers.isEmpty()) {
			return null;
		}

		if (classTweakers.size() != 1) {
			throw new UnsupportedOperationException("TODO: support multiple class tweakers");
		}

		final String accessWidenerPath = classTweakers.get(0);
		final byte[] accessWidener = fabricModJson.getSource().read(accessWidenerPath);
		final AccessWidenerReader.Header header = AccessWidenerReader.readHeader(accessWidener);

		return new AccessWidenerData(accessWidenerPath, header, accessWidener);
	}

	public record AccessWidenerData(String path, AccessWidenerReader.Header header, byte[] content) {
	}
}
