package customskinloader;

import java.io.File;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;

import com.google.common.collect.Maps;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.mojang.authlib.GameProfile;
import com.mojang.authlib.minecraft.MinecraftProfileTexture;
import customskinloader.config.Config;
import customskinloader.config.SkinSiteProfile;
import customskinloader.loader.ProfileLoader;
import customskinloader.log.LogManager;
import customskinloader.log.Logger;
import customskinloader.profile.DynamicSkullManager;
import customskinloader.profile.ModelManager0;
import customskinloader.profile.ProfileCache;
import customskinloader.profile.UserProfile;
import customskinloader.utils.MinecraftUtil;

/**
 * Custom skin loader mod for Minecraft.
 *
 * @author Jeremy Lam [JLChnToZ] 2013-2014 & Alexander Xia [xfl03] 2014-2023
 * @version @MOD_FULL_VERSION@
 */
public class CustomSkinLoader {
    public static final String CustomSkinLoader_VERSION = "@MOD_VERSION@";
    public static final String CustomSkinLoader_FULL_VERSION = "@MOD_FULL_VERSION@";
    public static final int CustomSkinLoader_BUILD_NUMBER = Integer.parseInt("@MOD_BUILD_NUMBER@");

    public static final File
            DATA_DIR = new File(MinecraftUtil.getMinecraftDataDir(), "CustomSkinLoader"),
            LOG_FILE = new File(DATA_DIR, "CustomSkinLoader.log"),
            CONFIG_FILE = new File(DATA_DIR, "CustomSkinLoader.json");

    public static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
    public static final Logger logger = initLogger();
    public static final Config config = initConfig();

    private static final ProfileCache profileCache = new ProfileCache();
    private static final DynamicSkullManager dynamicSkullManager = new DynamicSkullManager();

    private static final ExecutorService THREAD_POOL = new ThreadPoolExecutor(
            config.threadPoolSize, config.threadPoolSize, 1L, TimeUnit.MINUTES, new LinkedBlockingQueue<>());

    //Correct thread name in thread pool
    private static final ThreadFactory defaultFactory = Executors.defaultThreadFactory();
    private static final ThreadFactory customFactory = r -> {
        Thread t = defaultFactory.newThread(r);
        if (r instanceof Thread) {
            t.setName(((Thread) r).getName());
        }
        return t;
    };
    //Thread pool will discard oldest task when queue reaches 333 tasks
    private static final ThreadPoolExecutor threadPool = new ThreadPoolExecutor(
            config.threadPoolSize, config.threadPoolSize, 1L, TimeUnit.MINUTES,
            new LinkedBlockingQueue<>(333), customFactory, new ThreadPoolExecutor.DiscardOldestPolicy()
    );

    public static void loadProfileTextures(Runnable runnable) {
        THREAD_POOL.execute(runnable);
    }

    public static void loadProfileLazily(
            GameProfile gameProfile, Consumer<Map<MinecraftProfileTexture.Type, MinecraftProfileTexture>> consumer) {
        String username = gameProfile.getName();
        String credential = MinecraftUtil.getCredential(gameProfile);
        // Fix: http://hopper.minecraft.net/crashes/minecraft/MCX-2773713
        if (username == null) {
            logger.warning("Could not load profile: username is null.");
            consumer.accept(Maps.newHashMap());
            return;
        }
        String tempName = Thread.currentThread().getName();
        Thread.currentThread().setName(username); // Change Thread Name
        if (profileCache.isLoading(credential)) {
            profileCache.putLoader(credential, consumer);
            Thread.currentThread().setName(tempName);
            return;
        }
        consumer.accept(loadProfile(gameProfile));
        Thread.currentThread().setName(tempName);
        profileCache.getLastLoader(credential).ifPresent(c -> loadProfileLazily(gameProfile, c));
    }

    //For User Skin
    public static Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> loadProfile(GameProfile gameProfile) {
        String credential = MinecraftUtil.getCredential(gameProfile);
        UserProfile profile;
        if (profileCache.isReady(credential)) {
            logger.info("Cached profile will be used.");
            profile = profileCache.getProfile(credential);
            if (profile == null) {
                logger.warning("(Cached Profile is empty!) Expiry: " + profileCache.getExpiry(credential));
                if (profileCache.isExpired(credential)) { // force load
                    profile = loadProfile0(gameProfile, false);
                }
            } else {
                logger.info(profile.toString(profileCache.getExpiry(credential)));
            }
        } else {
            profileCache.setLoading(credential, true);
            profile = loadProfile0(gameProfile, false);
        }
        return ModelManager0.fromUserProfile(profile);
    }

    //Core
    public static UserProfile loadProfile0(GameProfile gameProfile, boolean isSkull) {
        String username = gameProfile.getName();
        String credential = MinecraftUtil.getCredential(gameProfile);

        profileCache.setLoading(credential, true);
        logger.info("Loading " + username + "'s profile.");
        if (config.loadlist == null || config.loadlist.isEmpty()) {
            logger.info("LoadList is Empty.");
            return null;
        }

        UserProfile profile0 = new UserProfile();
        for (int i = 0; i < config.loadlist.size(); i++) {
            SkinSiteProfile ssp = config.loadlist.get(i);
            logger.info((i + 1) + "/" + config.loadlist.size() + " Try to load profile from '" + ssp.name + "'.");
            if (ssp.type == null) {
                logger.info("The type of '" + ssp.name + "' is null.");
                continue;
            }
            ProfileLoader.IProfileLoader loader = ProfileLoader.LOADERS.get(ssp.type.toLowerCase());
            if (loader == null) {
                logger.info("Type '" + ssp.type + "' is not defined.");
                continue;
            }
            UserProfile profile = null;
            try {
                profile = loader.loadProfile(ssp, gameProfile);
            } catch (Exception e) {
                logger.warning("Exception occurs while loading.");
                logger.warning(e);
                if (e.getCause() != null) {
                    logger.warning("Caused By:");
                    logger.warning(e.getCause());
                }
            }
            if (profile == null) {
                continue;
            }
            profile0.mix(profile);
            if (isSkull && !profile0.hasSkinUrl()) {
                continue;
            }
            if (!config.forceLoadAllTextures) {
                break;
            }
            if (profile0.isFull()) {
                break;
            }
        }
        if (!profile0.isEmpty()) {
            logger.info(username + "'s profile loaded.");
            if (!config.enableCape) {
                profile0.capeUrl = null;
            }
            profileCache.updateCache(credential, profile0);
            profileCache.setLoading(credential, false);
            logger.info(profile0.toString(profileCache.getExpiry(credential)));
            return profile0;
        }
        logger.info(username + "'s profile not found in load list.");

        if (config.enableLocalProfileCache) {
            UserProfile profile = profileCache.getLocalProfile(credential);
            if (profile == null) {
                logger.info(username + "'s LocalProfile not found.");
            } else {
                profileCache.updateCache(credential, profile, false);
                profileCache.setLoading(credential, false);
                logger.info(username + "'s LocalProfile will be used.");
                logger.info(profile.toString(profileCache.getExpiry(credential)));
                return profile;
            }
        }
        profileCache.setLoading(credential, false);
        return null;
    }

    //For Skull
    public static Map<MinecraftProfileTexture.Type, MinecraftProfileTexture> loadProfileFromCache(
            final GameProfile gameProfile) {
        String username = gameProfile.getName();
        String credential = MinecraftUtil.getCredential(gameProfile);

        //CustomSkinLoader needs username to load standard skin, if username not exist, only textures in NBT can be used
        //Authlib 3.11.50 makes empty username to " "
        if (username == null || username.isEmpty() || username.equals(" ") || credential == null) {
            return dynamicSkullManager.getTexture(gameProfile);
        }
        if (config.forceUpdateSkull ? profileCache.isReady(credential) : profileCache.isExist(credential)) {
            UserProfile profile = profileCache.getProfile(credential);
            return ModelManager0.fromUserProfile(profile);
        }
        if (!profileCache.isLoading(credential)) {
            profileCache.setLoading(credential, true);
            Runnable loadThread = () -> {
                String tempName = Thread.currentThread().getName();
                Thread.currentThread().setName(username + "'s skull");
                loadProfile0(gameProfile, true);//Load in thread
                Thread.currentThread().setName(tempName);
            };
            if (config.forceUpdateSkull) {
                new Thread(loadThread).start();
            } else {
                threadPool.execute(loadThread);
            }
        }
        return Maps.newHashMap();
    }

    private static Logger initLogger() {
        LogManager.setLogFile(LOG_FILE.toPath());
        Logger logger = LogManager.getLogger("Core");
        logger.info("CustomSkinLoader " + CustomSkinLoader_FULL_VERSION);
        logger.info("DataDir: " + DATA_DIR.getAbsolutePath());
        logger.info("Operating System: " + System.getProperty("os.name") +
                " (" + System.getProperty("os.arch") + ") version " + System.getProperty("os.version"));
        logger.info("Java Version: " + System.getProperty("java.version") +
                ", " + System.getProperty("java.vendor"));
        logger.info("Java VM Version: " + System.getProperty("java.vm.name") +
                " (" + System.getProperty("java.vm.info") + "), " + System.getProperty("java.vm.vendor"));
        logger.info("Minecraft: " + MinecraftUtil.getMinecraftMainVersion());
        return logger;
    }

    /**
     * Create <code>Config</code> object.
     * To use <code>logger</code>, please make sure call this function after <code>initLogger</code>.
     *
     * @return <code>Config</code>
     */
    private static Config initConfig() {
        Config config = Config.loadConfig0();
        logger.enableLogStdOut = config.enableLogStdOut;
        return config;
    }
}