import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListAdapter;
import androidx.recyclerview.widget.RecyclerView;

import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.List;

import ua.com.adama.R;
import ua.com.adama.database.model.Contact;
import ua.com.adama.fragment.contacts.listmodels.ContactListItem;
import ua.com.adama.fragment.contacts.listmodels.ContactListModel;
import ua.com.adama.fragment.contacts.listmodels.RegionListItem;

public class ContactListAdapter extends ListAdapter<ContactListModel, ContactListViewHolder> {

    private OnRegionClickedListener onRegionClickedListener;
//    private List<ContactListModel> items = new ArrayList<>();

    public ContactListAdapter(OnRegionClickedListener onRegionClickedListener) {
        super(new ContactListAdapterDiffUtil());
        this.onRegionClickedListener = onRegionClickedListener;
    }

    @Override
    public int getItemViewType(int position) {
        return getItem(position).getType().getId();
    }


    @NonNull
    @Override
    public ContactListViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        switch (viewType) {
            case 0: return inflateRegionItemViewHolder(inflater, parent);
            case 1: return inflateContactItemViewHolder(inflater, parent);
        }
        throw new IllegalArgumentException("Cannot create instance of ContactListViewHolder for viewType=" + viewType);
    }

    private RegionItemViewHolder inflateRegionItemViewHolder(LayoutInflater inflater, @NotNull ViewGroup parent) {
        return new RegionItemViewHolder(
                inflater.inflate(R.layout.item_expandable_region_header, parent, false),
                onRegionClickedListener
        );
    }

    private ContactItemViewHolder inflateContactItemViewHolder(LayoutInflater inflater, @NotNull ViewGroup parent) {
        return new ContactItemViewHolder(
                inflater.inflate(R.layout.item_expandable_contact, parent, false)
        );
    }

//    public void submitList(List<ContactListModel> items) {
//        boolean needToNotify = this.items.isEmpty() && !items.isEmpty();
//        this.items.clear();
//        this.items.addAll(items);
//        if (needToNotify) {
//            notifyDataSetChanged();
//        }
//    }

    @Override
    public void onBindViewHolder(@NonNull ContactListViewHolder holder, int position) {
        holder.bind(getItem(position));
    }

    private static class ContactListAdapterDiffUtil extends DiffUtil.ItemCallback<ContactListModel> {

        @Override
        public boolean areItemsTheSame(@NonNull ContactListModel oldItem, @NonNull ContactListModel newItem) {
            if (oldItem instanceof RegionListItem && newItem instanceof RegionListItem) {
                final RegionListItem item1 = ((RegionListItem) oldItem);
                final RegionListItem item2 = ((RegionListItem) newItem);
                return item1.getRegion().getId() == item2.getRegion().getId();
            } else if (oldItem instanceof ContactListItem && newItem instanceof ContactListItem) {
                final Contact item1 = (((ContactListItem) oldItem).getContact());
                final Contact item2 = (((ContactListItem) newItem).getContact());
                return item1.getId() == item2.getId();
            }
            return false;
        }

        @Override
        public boolean areContentsTheSame(@NonNull ContactListModel oldItem, @NonNull ContactListModel newItem) {
            if (oldItem instanceof RegionListItem && newItem instanceof RegionListItem) {
                final RegionListItem item1 = ((RegionListItem) oldItem);
                final RegionListItem item2 = ((RegionListItem) newItem);
                return item1.isOpened() == item2.isOpened() && item1.getRegion().getName().equals(item2.getRegion().getName());
            } else if (oldItem instanceof ContactListItem && newItem instanceof ContactListItem) {
                final Contact item1 = (((ContactListItem) oldItem).getContact());
                final Contact item2 = (((ContactListItem) newItem).getContact());
                return TextUtils.equals(item1.getName_fam(), item2.getName_fam())
                        && TextUtils.equals(item1.getAdress(), item2.getAdress())
                        && TextUtils.equals(item1.getEmail(), item2.getEmail())
                        && TextUtils.equals(item1.getPosition(), item2.getPosition())
                        && TextUtils.equals(item1.getTelefon(), item2.getTelefon());
            }
            return false;
        }
    }

    public interface OnRegionClickedListener {
        void onClicked(int position);
    }

}

//IN FRAGMENT
        contactsController.itemsLiveData.observe(getViewLifecycleOwner(), contactListModels -> {
           adapter.submitList(new ArrayList<>(contactListModels));
        });