package io.gitlab.jfronny.inceptum.launcher.util;

import io.gitlab.jfronny.commons.io.JFiles;
import io.gitlab.jfronny.inceptum.launcher.model.inceptum.ModDescription;
import io.gitlab.jfronny.inceptum.launcher.model.inceptum.rt.Instance;
import io.gitlab.jfronny.inceptum.launcher.model.inceptum.rt.Mod;
import io.gitlab.jfronny.inceptum.launcher.system.mds.ModsDirScanner;
import io.gitlab.jfronny.inceptum.launcher.system.source.ModDownload;
import io.gitlab.jfronny.inceptum.launcher.system.source.ModSource;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

public class ModManager {
    public static void delete(Instance instance, Mod md) throws IOException {
        JFiles.deleteRecursive(md.path());
        if (md.imod().isPresent() && Files.exists(md.imod().get())) Files.delete(md.imod().get());
        if (md.mod().isPresent()) {
            for (String dependency : md.mod().get().dependencies) {
                Path dep = instance.modsDir().resolve(dependency);
                Mod dmd = instance.mds().get(dep);
                if (dmd.mod().isPresent()) {
                    dmd.mod().get().dependencies.remove(md.path().getFileName().toString());
                    if (dmd.mod().get().dependencies.isEmpty()) delete(instance, dmd);
                    else if (dmd.imod().isPresent()) JFiles.writeObject(dmd.imod().get(), dmd.mod().get());
                }
            }
        }
    }

    public static DownloadMeta download(ModSource ms, Path metaFile, ModsDirScanner mds) throws IOException {
        for (Mod value : mds.getMods()) {
            if (value.mod().isEmpty()) continue;
            for (ModSource source : value.mod().get().sources.keySet()) {
                if (ms.equals(source)) {
                    return new DownloadMeta(new ModDownload(value.mod().get().sha1, value.mod().get().murmur2, value.path()), value.mod().get(), source, metaFile);
                }
            }
        }
        ModDownload md = ms.download();
        ModDescription manifest = ModDescription.of(md.sha1(), md.murmur2(), ms, mds.getGameVersion());
        for (ModSource dependency : ms.getDependencies(mds.getGameVersion())) {
            DownloadMeta depMan = download(dependency, metaFile.getParent().resolve(dependency.getShortName() + ModPath.EXT_IMOD), mds);
            depMan.description.dependents.add(md.file().getFileName().toString());
            manifest.dependencies.add(depMan.download.file().getFileName().toString());
            depMan.write();
        }
        return new DownloadMeta(md, manifest, ms, metaFile);
    }

    public record DownloadMeta(ModDownload download, ModDescription description, ModSource source, Path metaFile) {
        public void write() throws IOException {
            JFiles.writeObject(metaFile, description);
        }
    }
}