package com.hypixel.hytale.server.flock;

import com.hypixel.hytale.codec.KeyedCodec;
import com.hypixel.hytale.codec.builder.BuilderCodec;
import com.hypixel.hytale.codec.codecs.array.ArrayCodec;
import com.hypixel.hytale.codec.store.StoredCodec;
import com.hypixel.hytale.component.AddReason;
import com.hypixel.hytale.component.ComponentRegistry;
import com.hypixel.hytale.component.Holder;
import com.hypixel.hytale.component.Ref;
import com.hypixel.hytale.component.RemoveReason;
import com.hypixel.hytale.component.Store;
import com.hypixel.hytale.server.core.universe.world.storage.EntityStore;
import com.hypixel.hytale.server.spawning.SpawningPlugin;
import it.unimi.dsi.fastutil.objects.ObjectArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.logging.Level;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class StoredFlock {
   public static final BuilderCodec<StoredFlock> CODEC = BuilderCodec.builder(StoredFlock.class, StoredFlock::new)
      .append(
         new KeyedCodec<>("Members", new ArrayCodec<>(new StoredCodec<>(EntityStore.HOLDER_CODEC_KEY), Holder[]::new)),
         (flock, array) -> flock.members = array,
         flock -> flock.members
      )
      .add()
      .build();
   @Nullable
   private Holder<EntityStore>[] members;

   public void storeNPCs(@Nonnull List<Ref<EntityStore>> refs, @Nonnull Store<EntityStore> store) {
      ComponentRegistry.Data<EntityStore> data = EntityStore.REGISTRY.getData();
      ObjectArrayList<Holder<EntityStore>> members = new ObjectArrayList();

      for (int i = 0; i < refs.size(); i++) {
         Ref<EntityStore> ref = refs.get(i);
         if (ref.isValid()) {
            Holder<EntityStore> holder = store.removeEntity(ref, RemoveReason.UNLOAD);
            if (holder.hasSerializableComponents(data)) {
               members.add(holder);
            }
         }
      }

      this.members = (Holder<EntityStore>[])members.toArray(Holder[]::new);
   }

   public boolean hasStoredNPCs() {
      return this.members != null;
   }

   public void restoreNPCs(@Nonnull List<Ref<EntityStore>> output, @Nonnull Store<EntityStore> store) {
      for (Holder<EntityStore> member : this.members) {
         Ref<EntityStore> ref = store.addEntity(member, AddReason.LOAD);
         if (ref == null) {
            SpawningPlugin.get().getLogger().at(Level.WARNING).log("Failed to restore stored spawn marker member! " + member);
         } else {
            output.add(ref);
         }
      }

      this.clear();
   }

   public void clear() {
      this.members = null;
   }

   @Nonnull
   @Override
   public String toString() {
      return "StoredFlock{, members=" + Arrays.toString((Object[])this.members) + "}";
   }

   @Nonnull
   public StoredFlock clone() {
      StoredFlock storedFlock = new StoredFlock();
      if (this.members != null) {
         Holder<EntityStore>[] newMembers = new Holder[this.members.length];

         for (int i = 0; i < newMembers.length; i++) {
            newMembers[i] = this.members[i].clone();
         }

         storedFlock.members = newMembers;
      }

      return storedFlock;
   }
}