package com.rxjava2.android.samples.ui.operators;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.rxjava2.android.samples.R;
import com.rxjava2.android.samples.model.Car;
import com.rxjava2.android.samples.utils.AppConstant;

import androidx.appcompat.app.AppCompatActivity;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.disposables.Disposable;

/**
 * Created by amitshekhar on 30/08/16.
 */
public class DeferExampleActivity extends AppCompatActivity {

    private static final String TAG = DeferExampleActivity.class.getSimpleName();
    Button btn;
    TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_example);
        btn = findViewById(R.id.btn);
        textView = findViewById(R.id.textView);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                doSomeWork();
            }
        });
    }

    /*
     * Defer used for Deferring Observable code until subscription in RxJava
     */
    private void doSomeWork() {

        Car car = new Car();

        Observable<String> brandDeferObservable = car.brandDeferObservable();

        car.setBrand("BMW");  // Even if we are setting the brand after creating Observable
        // we will get the brand as BMW.
        // If we had not used defer, we would have got null as the brand.

        brandDeferObservable
                .subscribe(getObserver());
    }

    private Observer<String> getObserver() {
        return new Observer<String>() {

            @Override
            public void onSubscribe(Disposable d) {
                Log.d(TAG, " onSubscribe : " + d.isDisposed());
            }

            @Override
            public void onNext(String value) {
                textView.append(" onNext : value : " + value);
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onNext : value : " + value);
            }

            @Override
            public void onError(Throwable e) {
                textView.append(" onError : " + e.getMessage());
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onError : " + e.getMessage());
            }

            @Override
            public void onComplete() {
                textView.append(" onComplete");
                textView.append(AppConstant.LINE_SEPARATOR);
                Log.d(TAG, " onComplete");
            }
        };
    }


}