public class PersonalChatAdapter extends RecyclerView.Adapter<PersonalChatAdapter.ViewHolder> {

    private Context context;
    private List<Users> usersList;
    private boolean isChat;

    String lastMessage;

    public PersonalChatAdapter(Context context, List<Users> usersList, boolean isChat) {
        this.context = context;
        this.usersList = usersList;
        this.isChat = isChat;
    }


    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.row_chat_personal, parent, false);

        return new PersonalChatAdapter.ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        final Users user = usersList.get(position);
        holder.username.setText(user.getUsername());

        if (user.getImageURL().equals("default")){
            holder.profilImage.setImageResource(R.mipmap.ic_launcher);
        } else {
            Glide.with(context).load(user.getImageURL()).into(holder.profilImage);
        }

        if (isChat){
            lastMessage(user.getId(), holder.last_msg);
        } else {
            holder.last_msg.setVisibility(View.GONE);
        }

        if (isChat){
            if (user.getStatus().equals("online")){
                holder.img_on.setVisibility(View.VISIBLE);
                holder.img_off.setVisibility(View.GONE);
            } else {
                holder.img_on.setVisibility(View.GONE);
                holder.img_off.setVisibility(View.VISIBLE);
            }
        } else{
            holder.img_on.setVisibility(View.GONE);
            holder.img_off.setVisibility(View.GONE);
        }

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent= new Intent(context, ChatActivity.class);
                intent.putExtra("userid", user.getId());
                context.startActivity(intent);
            }
        });
    }

    @Override
    public int getItemCount() {
        return 0;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView username, last_msg;
        public ImageView profilImage;
        private ImageView img_on, img_off;


        public ViewHolder(View itemView) {
            super(itemView);

            username = itemView.findViewById(R.id.tx_name);
            profilImage = itemView.findViewById(R.id.img_cp_list);
            img_on = itemView.findViewById(R.id.img_on);
            img_off = itemView.findViewById(R.id.img_off);
            last_msg = itemView.findViewById(R.id.last_msg);
        }
    }

    //check for last message
    private void lastMessage(final String userid, final TextView last_msg){
        lastMessage = "default";
        final FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
        DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Chats");

        reference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                for (DataSnapshot snapshot : dataSnapshot.getChildren()){
                    ChatModel chat = snapshot.getValue(ChatModel.class);

                    if (chat.getReceiver().equals(firebaseUser.getUid()) && chat.getSender().equals(userid) ||
                    chat.getReceiver().equals(userid) && chat.getSender().equals(firebaseUser.getUid())){
                        lastMessage = chat.getMessage();
                    }
                }

                switch (lastMessage){
                    case "default":
                        last_msg.setText("Tidak ada Pesan");
                        break;

                    default:
                        last_msg.setText(lastMessage);
                        break;
                }

                lastMessage = "default"
;            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });
    }
}