DDM 2022-12-07

//MainActivity.java
package com.joythis.android.datesdistance;

import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContract;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;

public class MainActivity extends AppCompatActivity {
    public final static String DATES_SAVED_DB =
            "DATES_SAVED.DB";
    SharedPreferences mSp;

    public final static String KEY_RESULT_DATE =
            "KEY_RESULT_DATE";
    public final static String KEY_CALLER =
            "KEY_CALLER";
    public final static String VALUE_DATE1 =
            "DATE1";
    public final static String VALUE_DATE2 =
            "DATE2";

    Activity mA;
    EditText mEtDate1, mEtDate2;
    Button mBtnPickDate1,
            mBtnPickDate2,
            mBtnComputeDistance;

    /////////////// SAFR modern pattern START //////////////////
    /*
    SAFR
    Contract
    Callback
    Launcher
     */
    ActivityResultContract mContract =
            new ActivityResultContracts.StartActivityForResult();

    ActivityResultCallback<ActivityResult> mCallback =
    new ActivityResultCallback<ActivityResult>() {
        @Override
        public void onActivityResult(ActivityResult result) {
            boolean bConfirm =
                result.getResultCode() == RESULT_OK;
            boolean bCanceled =
                result.getResultCode() == RESULT_CANCELED;
            if(bConfirm){
                Intent intentResponse = result.getData();
                if (intentResponse!=null){
                    int[] aYMD =
                    intentResponse.getIntArrayExtra(
                        KEY_RESULT_DATE
                    );
                    int y,m,d;
                    y = aYMD[0];
                    m = aYMD[1];
                    d = aYMD[2];

                    String strForWhomIsTheResult =
                    intentResponse.getStringExtra(
                        KEY_CALLER
                    );

                    /*
                    se o caller for VALUE_DATE1
                    devemos inscrever a data resultado
                    em mEtDate1
                    c.c.
                    se o caller for VALUE_DATE2
                    devemos inscrever a a data resultado
                    em mEtDate2
                     */
                    String strDate = String.format(
                        "%4d-%2d-%2d",
                        y,m,d
                    );
                    switch(strForWhomIsTheResult){
                        case VALUE_DATE1:
                            mEtDate1.setText(strDate);
                            break;
                        case VALUE_DATE2:
                            mEtDate2.setText(strDate);
                            break;
                    }//switch


                }//
            }
        }
    };

    ActivityResultLauncher<Intent> mLauncher =
        registerForActivityResult(
            mContract,
            mCallback
        );

    /////////////// SAFR modern pattern END //////////////////

    /////////////// ListView pattern START //////////////////
    ListView mLvDistances; //visualização

    ArrayAdapter<String> mAd;

    // 2022-12-06 and 2022-12-07 are 1 day(s) apart
    ArrayList<String> mAlDistances; // os dados

    /////////////// ListView pattern END //////////////////

    View.OnClickListener mClickHandler = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch(v.getId()){
                case R.id.idBtnPickDate1:
                    actionPickDate1();
                    break;
                case R.id.idBtnPickDate2:
                    actionPickDate2();
                    break;
                case R.id.idBtnComputeDistance:
                    actionComputeDistance();
                    break;
            }//switch
        }//onClick
    };//mClickHandler

    void actionComputeDistance(){
        //1 - instanciar um objeto AmDate
        // correspondente à data em mEtDate1
        AmDate d1 = new AmDate(
            mEtDate1.getText().toString().trim()
        );

        //2 - instanciar um objeto AmDate
        // correspondente à data em mEtDate2
        AmDate d2 = new AmDate(
            mEtDate2.getText().toString().trim()
        );

        //3 - pedir a um dos objetos (d1 ou d2)
        // que se meça
        // em dias, relativamente ao outro
        long distInDays = d2.distanceInDays(d1);

        //4 - preparar uma frase que inclua
        // a distância em dias
        //e.g.: 2022-12-06 and 2022-12-07 are 1 day(s) apart
        String strMsg =
        String.format(
            "%s and %s are %d day(s) apart",
            d1.toString(),
            d2.toString(),
            distInDays
        );

        //5 - mostrar a frase na ListView
        mAlDistances.add(0, strMsg);
        mAd.notifyDataSetChanged();

        //6 - gravar a nova distância
        // TODO: isolar em método próprio
        SharedPreferences.Editor ed = mSp.edit();
        Set<String> setDates = new HashSet<>();
        setDates.addAll(mAlDistances);
        ed.putStringSet(
            "DATES", setDates
        );
        ed.commit();
    }//actionComputeDistance

    void actionPickDate1(){
        //SAFR!!! TODO
        Intent goGoPickDate1 = new Intent(
            MainActivity.this,
            DateInput.class
        );

        // mera navegação
        //startActivity(goGoPickDate1);

        //SAFR modern
        goGoPickDate1.putExtra(
            KEY_CALLER,
            VALUE_DATE1
        );
        mLauncher.launch(goGoPickDate1);
    }//actionPickDate1

    void actionPickDate2(){
        //SAFR!!! TODO
        Intent goGoPickDate2 = new Intent(
                MainActivity.this,
                DateInput.class
        );

        // mera navegação
        //startActivity(goGoPickDate2);

        goGoPickDate2.putExtra(
            KEY_CALLER,
            VALUE_DATE2
        );

        mLauncher.launch(
            goGoPickDate2
        );
    }//actionPickDate2

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

        init();
    }//onCreate

    void init(){
        //1 - assocs
        mEtDate1 = findViewById(R.id.idEtDate1);
        mEtDate2 = findViewById(R.id.idEtDate2);
        mBtnPickDate1 = findViewById(R.id.idBtnPickDate1);
        mBtnPickDate2 = findViewById(R.id.idBtnPickDate2);
        mBtnComputeDistance = findViewById(R.id.idBtnComputeDistance);

        mLvDistances = findViewById(R.id.idLvDistances);
        mAlDistances = new ArrayList<>();
        mAd = new ArrayAdapter<String>(
            this,
            android.R.layout.simple_list_item_1,
            mAlDistances // os dados
        );

        mSp = getSharedPreferences(
            DATES_SAVED_DB,
            MODE_PRIVATE
        );
        if (mSp!=null){
            Set<String> setDates =
                mSp.getStringSet("DATES", null);
            if(setDates!=null){
                mAlDistances.clear();
                //mAlDistances.addAll(setDates);
                for (String d : setDates){
                    mAlDistances.add(0, d);
                }
            }
        }

        displayDefaultDates();

        //2 - behaviors
        mBtnPickDate1.setOnClickListener(mClickHandler);
        mBtnPickDate2.setOnClickListener(mClickHandler);
        mBtnComputeDistance.setOnClickListener(mClickHandler);

        mLvDistances.setAdapter(mAd);
    }//init

    void displayDefaultDates(){
        AmDate d = new AmDate();
        mEtDate1.setText(d.toString());
        mEtDate2.setText(d.toString());
    }//displayDefaultDates
}