/*
 * This file is part of fabric-loom, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2021 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.util;

import java.io.File;
import java.util.LinkedHashSet;
import java.util.Set;

import org.gradle.api.Project;
import org.gradle.api.artifacts.Configuration;
import org.gradle.api.artifacts.Dependency;
import org.gradle.api.artifacts.ModuleDependency;
import org.gradle.api.file.FileCollection;

/**
 * Simplified dependency downloading.
 *
 * @author Juuz
 */
public final class DependencyDownloader {
	/**
	 * Resolves a dependency as well as its transitive dependencies into a {@link FileCollection}.
	 *
	 * @param project            the project needing these files
	 * @param dependencyNotation the dependency notation
	 * @return the resolved files
	 */
	public static FileCollection download(Project project, String dependencyNotation) {
		return download(project, dependencyNotation, true, false);
	}

	public static FileCollection download(Project project, String dependencyNotation, boolean transitive, boolean resolve) {
		Dependency dependency = project.getDependencies().create(dependencyNotation);

		if (dependency instanceof ModuleDependency) {
			((ModuleDependency) dependency).setTransitive(transitive);
		}

		Configuration config = project.getConfigurations().detachedConfiguration(dependency);
		config.setTransitive(transitive);
		FileCollection files = config.fileCollection(dep -> true);

		if (resolve) {
			files = project.files(files.getFiles());
		}

		return files;
	}

	private static Set<File> resolve(Configuration configuration, boolean transitive) {
		Configuration copy = configuration.copy();
		copy.setTransitive(transitive);
		Set<File> files = new LinkedHashSet<>(copy.resolve());

		for (Configuration extendsForm : configuration.getExtendsFrom()) {
			files.addAll(resolve(extendsForm, transitive));
		}

		return files;
	}

	/**
	 * Resolves a configuration and its superconfigurations.
	 *
	 * <p>Note that unlike resolving a {@linkplain Configuration#copyRecursive() recursive copy} of the configuration,
	 * this method overrides the transitivity of all superconfigurations as well.
	 *
	 * @param configuration the configuration to resolve
	 * @param transitive    true if transitive dependencies should be included, false otherwise
	 * @return a mutable set containing the resolved files of the configuration
	 */
	public static Set<File> resolveFiles(Configuration configuration, boolean transitive) {
		return resolve(configuration, transitive);
	}
}