package com.example.sam.myfragmentprac;

import android.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "fragmentTAG";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void onAddClick(View view){
        // we need to new a FragmentTransaction every time when we need to do something
        FragmentManager fragmentManager = this.getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        //
        android.support.v4.app.Fragment fragment = fragmentManager.findFragmentById(R.id.myFrameLayoutContainer); //
        if (fragment == null){
            // prepare data
            String title = "Fragment A";
            MyFragment fragmentA = new MyFragment();
            Bundle bundle = new Bundle();
            bundle.putString("title",title);
            fragmentA.setArguments(bundle);
            //// real action - transaction
            //    將Fragment物件放到R.id.myFrameLayoutContainer這個容器上(創造Fragment+Attach它到容器上)
            fragmentTransaction.add(R.id.myFrameLayoutContainer, fragmentA, TAG);
            fragmentTransaction.commit();
        }else{
            showToast("fragment exists.");
        }
    }

    public void onReplaceClick(View view){
        // we need to new a FragmentTransaction every time when we need to do something
        FragmentManager fragmentManager = this.getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        //
        MyFragment fragmentB = new MyFragment();
        Bundle bundle = new Bundle();
        bundle.putString("title","fragment B");
        fragmentB.setArguments(bundle);
        fragmentTransaction.replace(R.id.myFrameLayoutContainer,fragmentB,TAG);
        fragmentTransaction.commit();
    }

    public void onAttachClick(View view){
        // we need to new a FragmentTransaction every time when we need to do something
        FragmentManager fragmentManager = this.getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        //
        android.support.v4.app.Fragment fragment = fragmentManager.findFragmentById(R.id.myFrameLayoutContainer);
        if (fragment == null){
            showToast("fragment does not exist.");
        }else{
            if (fragment.isDetached()){
                fragmentTransaction.attach(fragment);
                fragmentTransaction.commit();
            }else{
                showToast("fragment already attached");
            }
        }
    }

    public void onDettachClick(View view){
        // we need to new a FragmentTransaction every time when we need to do something
        FragmentManager fragmentManager = this.getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        //
        android.support.v4.app.Fragment fragment = fragmentManager.findFragmentById(R.id.myFrameLayoutContainer);
        if (fragment == null){
            showToast("fragment does not exist.");
        }else{
            if (!fragment.isDetached()){
                fragmentTransaction.detach(fragment);
                fragmentTransaction.commit();
            }else{
                showToast("fragment already dettached");
            }
        }
    }

    public void onRemoveClick(View view){
        // we need to new a FragmentTransaction every time when we need to do something
        FragmentManager fragmentManager = this.getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        //
        android.support.v4.app.Fragment fragment = fragmentManager.findFragmentById(R.id.myFrameLayoutContainer);
        if (fragment == null){
            showToast("fragment does not exist");
        }else{
            fragmentTransaction.remove(fragment);
            fragmentTransaction.commit();
        }
    }

    public void onFinishClick(View view){
        finish();
    }

    private void showToast(String msg){
        Toast.makeText(getApplicationContext(),
                msg,
                Toast.LENGTH_SHORT)
                .show();
    }
}