package com.joythis.android.fourcorners;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.util.Log; //for statements like Log.e(...)
import android.view.Gravity;
import android.view.View; //for the View datatype
import android.widget.Button; //here via ALT+ENTER
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    //ALT+ENTER > "import class" > import android.widget.Button;
    //Class data members
    Button mBtnULC=null, mBtnURC=null, mBtnLLC=null, mBtnLRC=null; //cascade declaration
    Context mContext;
    public static final String ERROR_STAMP = "NULL OBJECT";

    View.OnClickListener mClickHandler = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            boolean bCautious = v instanceof Button;
            if (bCautious){
                Button b = (Button)v;
                String strTheButtonText = b.getText().toString();
                Toast t = Toast.makeText(
                    mContext,
                    //"Button "+strTheButtonText+" was clicked!",
                strTheButtonText +
                    " "+
                    getString(R.string.strButtonResponse),
                    Toast.LENGTH_LONG
                );
                t.setGravity(
                    Gravity.CENTER,
                    0,
                    0
                );
                t.show();
            }//if bCautious
        }//onClick
    }; //mClickHandler

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        //CTRL+SPACE - all available autocomplete options
        setContentView(R.layout.rl_four_corners_v2);
        //setContentView(R.layout.cl_four_corners);

        init();
    }//onCreate

    public void someMethodInTheActivityClass (View pV){
        Toast t = Toast.makeText(
            this,
            //"hello",
            ((Button)pV).getText().toString(),
            Toast.LENGTH_LONG
        );
        t.show();
    }//someMethodInTheActivityClass

    void init(){
        this.mContext = this;
        //1 - bindings between XML elements and class data members
        //get rid of the null status
        mBtnULC = findViewById(R.id.idBtnULC);
        mBtnURC = findViewById(R.id.idBtnURC);
        mBtnLLC = findViewById(R.id.idBtnLLC);
        mBtnLRC = findViewById(R.id.idBtnLRC);

        //quality control
        Button[] aRelevantButtons = {
            mBtnLLC, mBtnLRC, mBtnURC, mBtnULC
        };
        for (Button b : aRelevantButtons){
            boolean bNull = b==null;
            if (bNull){
                Log.e(
                    ERROR_STAMP,
                    "Button found null. Aborting."
                );
                finish(); //terminates the Activity
            }//if
        }//for

        //2 - via the Java bindings, assign behavior to the XML elements
        mBtnULC.setOnClickListener(this); //useless
        mBtnURC.setOnClickListener(this); //useless
        mBtnLLC.setOnClickListener(mClickHandler); //useless

        makeAllButtonRespondToClickViaSameHandler(
            aRelevantButtons,
            mClickHandler //Buttons will respond via Class's mClickHandler
            //this //Buttons will respond via Class's onclick
        );
    }//init

    void makeAllButtonRespondToClickViaSameHandler(
        Button[] pButtonsThatShouldBehaveViaTheSameHandler,
        View.OnClickListener pHandler
    ){
        for (Button b : pButtonsThatShouldBehaveViaTheSameHandler){
            b.setOnClickListener(pHandler);
        }//for
    }//makeAllButtonRespondToClickViaSameHandler

    /*
    the contractual interface View.OnClickListener
    comes with a single obligation
    to write the onClick method

    The class itself now provides a solution named "onClick"
    for whatever View object to respond to a click
     */
    @Override
    public void onClick(View v) {
        int iWhichViewWasClicked = v.getId();
        switch(iWhichViewWasClicked){
            case R.id.idBtnULC:
            case R.id.idBtnURC:
            case R.id.idBtnLLC:
            case R.id.idBtnLRC:
                Toast t = Toast.makeText(
                    mContext,//Context
                    "via implements interface",//String (the message)
                    Toast.LENGTH_LONG //int (the message's duration)
                );
                t.show();
        }//switch
    }//onClick
}//MainActivity