package io.gitlab.jfronny.resclone;

import com.google.gson.Gson;
import io.gitlab.jfronny.resclone.data.PackMetaLoaded;
import io.gitlab.jfronny.resclone.api.RescloneApi;
import io.gitlab.jfronny.resclone.api.RescloneEntry;
import io.gitlab.jfronny.resclone.data.PackMetaUnloaded;
import io.gitlab.jfronny.resclone.data.RescloneException;
import io.gitlab.jfronny.resclone.fetchers.PackFetcher;
import io.gitlab.jfronny.resclone.processors.PackProcessor;
import io.gitlab.jfronny.resclone.processors.RemoveEmptyProcessor;
import io.gitlab.jfronny.resclone.processors.RootPathProcessor;
import net.fabricmc.api.ModInitializer;
import net.fabricmc.loader.api.FabricLoader;

import java.io.IOException;
import java.net.URI;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;

public class Resclone implements ModInitializer, RescloneApi {
    public static final Set<PackMetaUnloaded> conf = new LinkedHashSet<>();
    public static final Map<String, PackFetcher> fetcherInstances = new LinkedHashMap<>();
    public static final Set<PackProcessor> processors = new LinkedHashSet<>();
    public static final Set<PackMetaLoaded> downloadedPacks = new LinkedHashSet<>();
    public static final Gson gson = new Gson();
    public static final String MOD_ID = "resclone";
    public static PackUrlCache urlCache;

    @Override
    public void onInitialize() {
        System.out.println("[resclone] Beginning init, will download packs");
        urlCache = new PackUrlCache(getConfigPath().resolve("urlCache.properties"));
        conf.clear();
        fetcherInstances.clear();
        processors.clear();
        downloadedPacks.clear();
        addProcessor(new RootPathProcessor()); //This should be run before any other processor to make sure the path is valid
        for (RescloneEntry entry : FabricLoader.getInstance().getEntrypoints(MOD_ID, RescloneEntry.class)) {
            try {
                entry.init(this);
            } catch (RescloneException e) {
                e.printStackTrace();
            }
        }
        addProcessor(new RemoveEmptyProcessor());
        reload();
        System.out.println("[resclone] Completed");
    }

    @Override
    public void addFetcher(PackFetcher fetcher) {
        fetcherInstances.put(fetcher.getSourceTypeName(), fetcher);
    }

    @Override
    public void addProcessor(PackProcessor processor) {
        processors.add(processor);
    }

    @Override
    public void addPack(String fetcher, String pack, String name) {
        addPack(fetcher, pack, name, false);
    }

    @Override
    public void addPack(String fetcher, String pack, String name, boolean forceRedownload) {
        conf.add(new PackMetaUnloaded(fetcher, pack, name, forceRedownload));
    }

    @Override
    public void reload() {
        //Get paths from patchers. Downloading is implemented in PackFetcher to allow for unconsidered sources
        Set<PackMetaLoaded> metas = new LinkedHashSet<>();
        //Download
        for (PackMetaUnloaded s : conf) {
            try {
                if (!fetcherInstances.containsKey(s.fetcher))
                    throw new RescloneException("Invalid fetcher: " + s.fetcher);
                Path cacheDir = getConfigPath().resolve("cache");
                PackMetaLoaded p;
                try {
                    //Download
                    PackFetcher.Result fr = fetcherInstances.get(s.fetcher).get(s.source, cacheDir, s.forceDownload);
                    p = new PackMetaLoaded(fr.downloadPath, s.name);
                    metas.add(p);
                    if (fr.freshDownload) {
                        //Process
                        Map<String, String> props = new HashMap<>();
                        props.put("create", "false");
                        URI zipfile = URI.create("jar:" + p.zipPath.toUri().toString());
                        try (FileSystem zipfs = FileSystems.newFileSystem(zipfile, props)) {
                            for (PackProcessor processor : processors) {
                                processor.process(zipfs);
                            }

                        } catch (Throwable e) {
                            e.printStackTrace();
                        }
                    }
                }
                catch (Throwable e) {
                    throw new RescloneException("Failed to download pack", e);
                }
            } catch (Throwable e) {
                System.err.println("Encountered issue while preparing " + s.name);
                e.printStackTrace();
            }
        }
        //Set variable
        urlCache.save();
        downloadedPacks.clear();
        downloadedPacks.addAll(metas);
    }

    @Override
    public Path getConfigPath() {
        Path configPath = FabricLoader.getInstance().getConfigDir().resolve("resclone");
        if (!Files.isDirectory(configPath.resolve("cache"))) {
            try {
                Files.createDirectories(configPath.resolve("cache"));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return configPath;
    }
}