package de.hysky.skyblocker.utils;

import com.mojang.brigadier.Command;
import de.hysky.skyblocker.SkyblockerMod;
import de.hysky.skyblocker.skyblock.itemlist.ItemRepository;
import de.hysky.skyblocker.utils.scheduler.Scheduler;
import io.github.moulberry.repo.NEURepository;
import net.fabricmc.fabric.api.client.command.v2.ClientCommandManager;
import net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback;
import net.minecraft.client.MinecraftClient;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.text.Text;
import org.apache.commons.lang3.function.Consumers;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.TransportException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.concurrent.CompletableFuture;

/**
 * Initializes the NEU repo, which contains item metadata and fairy souls location data. Clones the repo if it does not exist and checks for updates. Use {@link #runAsyncAfterLoad(Runnable)} to run code after the repo is initialized.
 */
public class NEURepoManager {
    private static final Logger LOGGER = LoggerFactory.getLogger(NEURepoManager.class);
    public static final String REMOTE_REPO_URL = "https://github.com/NotEnoughUpdates/NotEnoughUpdates-REPO.git";
    /**
     * Use {@link #NEU_REPO}.
     */
    private static final Path LOCAL_REPO_DIR = SkyblockerMod.CONFIG_DIR.resolve("item-repo"); // TODO rename to NotEnoughUpdates-REPO
    private static CompletableFuture<Void> REPO_LOADING = loadRepository().thenAccept(Consumers.nop());
    public static final NEURepository NEU_REPO = NEURepository.of(LOCAL_REPO_DIR);

    /**
     * Adds command to update repository manually from ingame.
     * <p></p>
     * TODO A button could be added to the settings menu that will trigger this command.
     */
    public static void init() {
        ClientCommandRegistrationCallback.EVENT.register((dispatcher, registryAccess) ->
                dispatcher.register(ClientCommandManager.literal(SkyblockerMod.NAMESPACE)
                        .then(ClientCommandManager.literal("updateRepository").executes(context -> {
                            deleteAndDownloadRepository(context.getSource().getPlayer());
                            return Command.SINGLE_SUCCESS;
                        }))
                )
        );
    }

    private static CompletableFuture<Boolean> loadRepository() {
        return CompletableFuture.supplyAsync(() -> {
            try {
                if (Files.isDirectory(NEURepoManager.LOCAL_REPO_DIR)) {
                    try (Git localRepo = Git.open(NEURepoManager.LOCAL_REPO_DIR.toFile())) {
                        localRepo.pull().setRebase(true).call();
                        LOGGER.info("[Skyblocker] NEU Repository Updated");
                    }
                } else {
                    Git.cloneRepository().setURI(REMOTE_REPO_URL).setDirectory(NEURepoManager.LOCAL_REPO_DIR.toFile()).setBranchesToClone(List.of("refs/heads/master")).setBranch("refs/heads/master").call().close();
                    LOGGER.info("[Skyblocker] NEU Repository Downloaded");
                }
                NEU_REPO.reload();
                return true;
            } catch (TransportException e) {
                LOGGER.error("[Skyblocker] Transport operation failed. Most likely unable to connect to the remote NEU repo on github", e);
            } catch (RepositoryNotFoundException e) {
                LOGGER.warn("[Skyblocker] Local NEU Repository not found or corrupted, downloading new one", e);
                Scheduler.INSTANCE.schedule(() -> deleteAndDownloadRepository(MinecraftClient.getInstance().player), 1);
            } catch (Exception e) {
                LOGGER.error("[Skyblocker] Encountered unknown exception while initializing NEU Repository", e);
            }
            return false;
        });
    }

    private static void deleteAndDownloadRepository(PlayerEntity player) {
        if (REPO_LOADING != null && !REPO_LOADING.isDone()) {
            player.sendMessage(Constants.PREFIX.get().append(Text.translatable("skyblocker.updateRepository.loading")), false);
            return;
        }
        player.sendMessage(Constants.PREFIX.get().append(Text.translatable("skyblocker.updateRepository.start")), false);

        REPO_LOADING = CompletableFuture.runAsync(() -> {
            try {
                ItemRepository.setFilesImported(false);
                FileUtils.recursiveDelete(NEURepoManager.LOCAL_REPO_DIR);
                player.sendMessage(Constants.PREFIX.get().append(Text.translatable("skyblocker.updateRepository.deleted")), false);
                player.sendMessage(Constants.PREFIX.get().append(Text.translatable(loadRepository().join() ? "skyblocker.updateRepository.success" : "skyblocker.updateRepository.failed")), false);
            } catch (Exception e) {
                LOGGER.error("[Skyblocker] Encountered unknown exception while deleting the NEU repo", e);
                player.sendMessage(Constants.PREFIX.get().append(Text.translatable("skyblocker.updateRepository.error")), false);
            }
        });
    }

    /**
     * Runs the given runnable after the NEU repo is initialized.
     * @param runnable the runnable to run
     * @return a completable future of the given runnable
     */
    public static CompletableFuture<Void> runAsyncAfterLoad(Runnable runnable) {
        return REPO_LOADING.thenRunAsync(runnable);
    }
}