package games.coob.core.hologram;

import games.coob.core.specific.hologram.NMSHologram;
import lombok.Getter;
import org.mineacademy.fo.MinecraftVersion;
import org.mineacademy.fo.Valid;
import org.mineacademy.fo.collection.SerializedMap;
import org.mineacademy.fo.constants.FoConstants;
import org.mineacademy.fo.settings.YamlConfig;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.UUID;

/**
 * Represents an elegant way to permanently store and load Holograms
 */
public final class HologramRegistry extends YamlConfig {

    /**
     * The singleton of this class
     */
    @Getter
    private static final HologramRegistry instance = new HologramRegistry();

    /**
     * Represents currently loaded Holograms
     */
    private final List<NMSHologram> loadedHolograms = new ArrayList<>();

    /**
     * Create a new registry and load
     */
    private HologramRegistry() {
        this.loadConfiguration(NO_DEFAULT, FoConstants.File.DATA);
    }

    /**
     * Automatically loads stored disk Holograms and spawns them
     */
    public void spawnFromDisk() {
        if (!MinecraftVersion.atLeast(MinecraftVersion.V.v1_16))
            return;

        // Tricky: This automatically calls the spawn method which puts the hologram to our loadedHolograms list
        this.getList("Saved_Holograms", NMSHologram.class);

        System.out.println("@Found " + this.loadedHolograms.size() + " Holograms on the disk");

        for (final NMSHologram hologram : this.loadedHolograms)
            System.out.println("\tspawned " + hologram + " at " + hologram.getLocation());
    }

    /**
     * @see YamlConfig#serialize()
     */
    @Override
    protected SerializedMap serialize() {
        return SerializedMap.of("Saved_Holograms", this.getLoadedHolograms());
    }

    /**
     * Registers a new hologram to our map
     *
     * @param hologram
     */
    public void register(final NMSHologram hologram) {
        Valid.checkBoolean(this.isRegistered(hologram), hologram + " is already registered!");

        this.loadedHolograms.add(hologram);
        this.save();
    }

    /**
     * Return true if the given hologram is already registered
     *
     * @param hologram
     * @return
     */
    public boolean isRegistered(final NMSHologram hologram) {
        return hologram == null || this.isRegistered(hologram.getUniqueId());
    }

    /**
     * Return true if the given hologram is already registered
     *
     * @param entityUniqueId
     * @return
     */
    public boolean isRegistered(final UUID entityUniqueId) {
        for (final NMSHologram hologram : this.loadedHolograms)
            if (hologram != null && hologram.getUniqueId().equals(entityUniqueId))
                return false;

        return true;
    }

    /**
     * Get the loaded holograms
     */
    public List<NMSHologram> getLoadedHolograms() {
        return Collections.unmodifiableList(loadedHolograms);
    }
}