/*
 * This file is part of fabric-loom, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2016, 2017, 2018 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;

import java.io.File;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.function.Supplier;

import javax.annotation.Nullable;

import com.google.gson.JsonObject;
import org.cadixdev.lorenz.MappingSet;
import org.cadixdev.mercury.Mercury;
import org.gradle.api.Project;
import org.gradle.api.artifacts.Configuration;
import org.gradle.api.artifacts.Dependency;
import org.gradle.api.plugins.BasePluginConvention;

import net.fabricmc.loom.api.decompilers.LoomDecompiler;
import net.fabricmc.loom.processors.JarProcessorManager;
import net.fabricmc.loom.providers.MappingsProvider;
import net.fabricmc.loom.providers.MinecraftMappedProvider;
import net.fabricmc.loom.providers.MinecraftProvider;
import net.fabricmc.loom.util.LoomDependencyManager;

public class LoomGradleExtension {
	public String runDir = "run";
	public String refmapName;
	public String loaderLaunchMethod;
	public boolean remapMod = true;
	public boolean autoGenIDERuns = true;
	public String customManifest = null;
	public File accessWidener = null;
	public Function<String, Object> intermediaryUrl = mcVer -> "https://maven.fabricmc.net/net/fabricmc/intermediary/" + mcVer + "/intermediary-" + mcVer + "-v2.jar";

	private List<Path> unmappedModsBuilt = new ArrayList<>();

	final List<LoomDecompiler> decompilers = new ArrayList<>();

	//Not to be set in the build.gradle
	private Project project;
	private LoomDependencyManager dependencyManager;
	private JarProcessorManager jarProcessorManager;
	private JsonObject installerJson;
	private MappingSet[] srcMappingCache = new MappingSet[2];
	private Mercury[] srcMercuryCache = new Mercury[2];

	/**
	 * Loom will generate a new genSources task (with a new name, based off of {@link LoomDecompiler#name()})
	 * that uses the specified decompiler instead.
	 */
	public void addDecompiler(LoomDecompiler decompiler) {
		decompilers.add(decompiler);
	}

	public MappingSet getOrCreateSrcMappingCache(int id, Supplier<MappingSet> factory) {
		return srcMappingCache[id] != null ? srcMappingCache[id] : (srcMappingCache[id] = factory.get());
	}

	public Mercury getOrCreateSrcMercuryCache(int id, Supplier<Mercury> factory) {
		return srcMercuryCache[id] != null ? srcMercuryCache[id] : (srcMercuryCache[id] = factory.get());
	}

	public LoomGradleExtension(Project project) {
		this.project = project;
	}

	public void addUnmappedMod(Path file) {
		unmappedModsBuilt.add(file);
	}

	public List<Path> getUnmappedMods() {
		return Collections.unmodifiableList(unmappedModsBuilt);
	}

	public void setInstallerJson(JsonObject object) {
		this.installerJson = object;
	}

	public JsonObject getInstallerJson() {
		return installerJson;
	}

	public void accessWidener(Object file) {
		this.accessWidener = project.file(file);
	}

	public File getUserCache() {
		File userCache = new File(project.getGradle().getGradleUserHomeDir(), "caches" + File.separator + "fabric-loom");

		if (!userCache.exists()) {
			userCache.mkdirs();
		}

		return userCache;
	}

	public File getRootProjectPersistentCache() {
		File projectCache = new File(project.getRootProject().file(".gradle"), "loom-cache");

		if (!projectCache.exists()) {
			projectCache.mkdirs();
		}

		return projectCache;
	}

	public File getProjectPersistentCache() {
		File projectCache = new File(project.file(".gradle"), "loom-cache");

		if (!projectCache.exists()) {
			projectCache.mkdirs();
		}

		return projectCache;
	}

	public File getRootProjectBuildCache() {
		File projectCache = new File(project.getRootProject().getBuildDir(), "loom-cache");

		if (!projectCache.exists()) {
			projectCache.mkdirs();
		}

		return projectCache;
	}

	public File getProjectBuildCache() {
		File projectCache = new File(project.getBuildDir(), "loom-cache");

		if (!projectCache.exists()) {
			projectCache.mkdirs();
		}

		return projectCache;
	}

	public File getRemappedModCache() {
		File remappedModCache = new File(getRootProjectPersistentCache(), "remapped_mods");

		if (!remappedModCache.exists()) {
			remappedModCache.mkdir();
		}

		return remappedModCache;
	}

	public File getNestedModCache() {
		File nestedModCache = new File(getRootProjectPersistentCache(), "nested_mods");

		if (!nestedModCache.exists()) {
			nestedModCache.mkdir();
		}

		return nestedModCache;
	}

	public File getNativesJarStore() {
		File natives = new File(getUserCache(), "natives/jars");

		if (!natives.exists()) {
			natives.mkdirs();
		}

		return natives;
	}

	public File getNativesDirectory() {
		File natives = new File(getUserCache(), "natives/" + getMinecraftProvider().getMinecraftVersion());

		if (!natives.exists()) {
			natives.mkdirs();
		}

		return natives;
	}

	public File getDevLauncherConfig() {
		return new File(getRootProjectPersistentCache(), "launch.cfg");
	}

	@Nullable
	private static Dependency findDependency(Project p, Collection<Configuration> configs, BiPredicate<String, String> groupNameFilter) {
		for (Configuration config : configs) {
			for (Dependency dependency : config.getDependencies()) {
				String group = dependency.getGroup();
				String name = dependency.getName();

				if (groupNameFilter.test(group, name)) {
					p.getLogger().debug("Loom findDependency found: " + group + ":" + name + ":" + dependency.getVersion());
					return dependency;
				}
			}
		}

		return null;
	}

	@Nullable
	private <T> T recurseProjects(Function<Project, T> projectTFunction) {
		Project p = this.project;
		T result;

		while (!AbstractPlugin.isRootProject(p)) {
			if ((result = projectTFunction.apply(p)) != null) {
				return result;
			}

			p = p.getRootProject();
		}

		result = projectTFunction.apply(p);
		return result;
	}

	@Nullable
	private Dependency getMixinDependency() {
		return recurseProjects((p) -> {
			List<Configuration> configs = new ArrayList<>();
			// check compile classpath first
			Configuration possibleCompileClasspath = p.getConfigurations().findByName("compileClasspath");

			if (possibleCompileClasspath != null) {
				configs.add(possibleCompileClasspath);
			}

			// failing that, buildscript
			configs.addAll(p.getBuildscript().getConfigurations());

			return findDependency(p, configs, (group, name) -> {
				if (name.equalsIgnoreCase("mixin") && group.equalsIgnoreCase("org.spongepowered")) {
					return true;
				}

				if (name.equalsIgnoreCase("sponge-mixin") && group.equalsIgnoreCase("net.fabricmc")) {
					return true;
				}

				return false;
			});
		});
	}

	@Nullable
	public String getMixinJsonVersion() {
		Dependency dependency = getMixinDependency();

		if (dependency != null) {
			if (dependency.getGroup().equalsIgnoreCase("net.fabricmc")) {
				if (Objects.requireNonNull(dependency.getVersion()).split("\\.").length >= 4) {
					return dependency.getVersion().substring(0, dependency.getVersion().lastIndexOf('.')) + "-SNAPSHOT";
				}
			}

			return dependency.getVersion();
		}

		return null;
	}

	public String getLoaderLaunchMethod() {
		return loaderLaunchMethod != null ? loaderLaunchMethod : "";
	}

	public LoomDependencyManager getDependencyManager() {
		return dependencyManager;
	}

	public MinecraftProvider getMinecraftProvider() {
		return getDependencyManager().getProvider(MinecraftProvider.class);
	}

	public MinecraftMappedProvider getMinecraftMappedProvider() {
		return getMappingsProvider().mappedProvider;
	}

	public MappingsProvider getMappingsProvider() {
		return getDependencyManager().getProvider(MappingsProvider.class);
	}

	public void setDependencyManager(LoomDependencyManager dependencyManager) {
		this.dependencyManager = dependencyManager;
	}

	public JarProcessorManager getJarProcessorManager() {
		return jarProcessorManager;
	}

	public void setJarProcessorManager(JarProcessorManager jarProcessorManager) {
		this.jarProcessorManager = jarProcessorManager;
	}

	public String getRefmapName() {
		if (refmapName == null || refmapName.isEmpty()) {
			String defaultRefmapName = project.getConvention().getPlugin(BasePluginConvention.class).getArchivesBaseName() + "-refmap.json";
			project.getLogger().info("Could not find refmap definition, will be using default name: " + defaultRefmapName);
			refmapName = defaultRefmapName;
		}

		return refmapName;
	}

	public boolean ideSync() {
		return Boolean.parseBoolean(System.getProperty("idea.sync.active", "false"));
	}

	// Ideally this should use maven, but this is a lot easier
	public Function<String, String> getIntermediaryUrl() {
		//Done like this to work around this possibly not being a java string...
		return s -> intermediaryUrl.apply(s).toString();
	}
}