import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

import com.firebase.client.Firebase;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class MainActivity extends AppCompatActivity {
    private  Button add_room;
    private  EditText room_name;
    private ListView listView;
    private String name;
    private DatabaseReference root = FirebaseDatabase.getInstance().getReference().getRoot();

    private ArrayAdapter<String> arrayAdapter;
    private ArrayList<String> list_of_rooms = new ArrayList();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        add_room = (Button)findViewById(R.id.btnAdd_room);
        room_name = (EditText)findViewById(R.id.etNeme_room);
        listView = (ListView)findViewById(R.id.listView);

        arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list_of_rooms);
        listView.setAdapter(arrayAdapter);

        request_user_name();
        add_room.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Map<String,Object> map = new HashMap<String,Object>();
                map.put(room_name.getText().toString(),"");
                root.updateChildren(map);

            }
        });
        root.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                Set<String> set = new HashSet<String>();
                Iterator i = dataSnapshot.getChildren().iterator();
                while ( i.hasNext())
                {
                    set.add(((DataSnapshot)i.next()).getKey());
                }
                list_of_rooms.clear();
                list_of_rooms.addAll(set);

                arrayAdapter.notifyDataSetChanged();
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                Intent I = new Intent(getApplicationContext(),chatroom.class);
                I.putExtra("room_name",((TextView)view).getText().toString());
                I.putExtra("user_name",name);
                startActivity(I);
            }
        });

    }

    private void request_user_name() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Enter Name");
        final EditText input_field = new EditText(this);
        builder.setView(input_field);
        builder.setPositiveButton("OK ", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                name = input_field.getText().toString();
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.cancel();
                request_user_name();
            }
        });
        builder.show();
    }
}