package com.example.mikus.calc;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private static int task = 0;
    private static String in1 = "0";
    private static String in2 = "0";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt1 = (Button) findViewById(R.id.bt1);
        Button bt2 = (Button) findViewById(R.id.bt2);
        Button bt3 = (Button) findViewById(R.id.bt3);
        Button bt4 = (Button) findViewById(R.id.bt4);
        Button bt5 = (Button) findViewById(R.id.bt5);
        Button bt6 = (Button) findViewById(R.id.bt6);
        Button bt7 = (Button) findViewById(R.id.bt7);
        Button bt8 = (Button) findViewById(R.id.bt8);
        Button bt9 = (Button) findViewById(R.id.bt9);
        Button bt0 = (Button) findViewById(R.id.bt0);
        Button btdot = (Button) findViewById(R.id.btdot);
        Button btdevide = (Button) findViewById(R.id.btdevide);
        Button bttimes = (Button) findViewById(R.id.bttimes);
        Button btminus = (Button) findViewById(R.id.btminus);
        Button btplus = (Button) findViewById(R.id.btplus);
        Button btequals = (Button) findViewById(R.id.btequals);
        final TextView txt = (TextView) findViewById(R.id.textView);


        bt1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "1";
                txt.setText(text);
            }
        });

        bt2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "2";

                txt.setText(text);
            }
        });

        bt3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "3";

                txt.setText(text);
            }
        });

        bt4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "4";

                txt.setText(text);
            }
        });

        bt5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "5";

                txt.setText(text);
            }
        });

        bt6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "6";

                txt.setText(text);
            }
        });

        bt7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "7";

                txt.setText(text);
            }
        });

        bt8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "8";

                txt.setText(text);
            }
        });

        bt9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "9";

                txt.setText(text);
            }
        });

        bt0.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + "0";

                txt.setText(text);
            }
        });

        btdot.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text = txt.getText() + ".";

                txt.setText(text);
            }
        });

        btequals.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int a = Integer.parseInt(in1);
                in2 = txt.getText().toString();
                int b = Integer.parseInt(in2);
                if(task == 1){
                    txt.setText(a + b);
                }
                if(task == 2){
                    txt.setText(a - b);
                }
                if(task == 3){
                    txt.setText(a * b);
                }
                if(task == 4){
                    txt.setText(a / b);
                }
            }
        });

        btplus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                task = 1;
                in1 = txt.getText().toString();
                txt.setText("");
            }
        });

        btminus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                task = 2;
                in1 = txt.getText().toString();
                txt.setText("");
            }
        });

        bttimes.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                task = 3;
                in1 = txt.getText().toString();
                txt.setText("");
            }
        });


        btdevide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                task = 4;
                in1 = txt.getText().toString();
                txt.setText("");
            }
        });
    }
}

txt.setText(String.valueOf(a + b));