package com.example.scientificcalculator;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;

 public class MainActivity extends AppCompatActivity {

     EditText input, sign;
     float value1, value2;
     String facto;
     int i,num;
     long factorial;
     boolean summation, subtraction, multiplication, divition, hasdot, log, ln, xn, root, not, sin, cos, tan;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        input = findViewById(R.id.input);
        sign = findViewById(R.id.sign);
    }

     public void zero(View view) {
        input.setText(input.getText()+"0");
     }

     public void one(View view) {
         input.setText(input.getText()+"1");
     }

     public void two(View view) {
         input.setText(input.getText()+"2");
     }

     public void three(View view) {
         input.setText(input.getText()+"3");
     }

     public void four(View view) {
         input.setText(input.getText()+"4");
     }

     public void five(View view) {
         input.setText(input.getText()+"5");
     }

     public void six(View view) {
         input.setText(input.getText()+"6");
     }

     public void seven(View view) {
         input.setText(input.getText()+"7");
     }

     public void eight(View view) {
         input.setText(input.getText()+"8");
     }

     public void nine(View view) {
         input.setText(input.getText()+"9");
     }

     public void dot(View view) {
        if(!hasdot){
            if(input.getText().equals("")){
                input.setText("0.");
            }
            else {
                input.setText(input.getText()+".");
            }
            hasdot=true;
        }
     }

     public void sum(View view) {
        try {
            value1 = Float.parseFloat(input.getText() + "");
            summation = true;
            sign.setText("+");
            input.setText("");
            hasdot = false;
        }
        catch (Exception e){

        }
     }

     public void sub(View view) {
        try {
            value1 = Float.parseFloat(input.getText() + "");
            subtraction = true;
            sign.setText("-");
            input.setText("");
            hasdot = false;
        }
        catch (Exception e){

        }
     }

     public void multi(View view) {
        try {
            value1 = Float.parseFloat(input.getText() + "");
            multiplication = true;
            sign.setText("*");
            input.setText("");
            hasdot = false;
        }
        catch (Exception e){

        }
     }

     public void divi(View view) {
        try {
            value1 = Float.parseFloat(input.getText() + "");
            divition = true;
            sign.setText("/");
            input.setText("");
            hasdot = false;
        }
        catch (Exception e){

        }
     }

     public void delete(View view) {
        try{
        if(input.getText().equals("")){
            input.setText(null);
        }
        else {
            int len = input.getText().length();
            String s = input.getText().toString();
            if(s.charAt(len-1)=='.'){
                input.setText(input.getText().subSequence(0,input.getText().length()-1));
                hasdot=false;
            }
            else {
                input.setText(input.getText().subSequence(0,input.getText().length()-1));
            }
        }
     }
        catch (Exception e){

        }
    }

     public void clear(View view) {
         input.setText("");
         sign.setText("");
         hasdot=false;
     }

     public void log(View view) {
         log = true;
         sign.setText("log");
         input.setText("");
     }

     public void ln(View view) {
         ln = true;
         sign.setText("ln");
         input.setText("");
     }

     public void xn(View view) {
        try {
            value1 = Float.parseFloat(input.getText() + "");
            xn = true;
            sign.setText("^");
            input.setText("");
        }
        catch (Exception e){

        }
     }

     public void root(View view) {
         root = true;
         sign.setText("√");
         input.setText("");
     }

     public void not(View view) {
        try {
            value1 = Float.parseFloat(input.getText() + "");
            facto = input.getText()+"";
            not = true;
            sign.setText("!");
            input.setText("");
        }
        catch (Exception e){

        }
     }

     public void sin(View view) {
         sin = true;
         sign.setText("sin");
         input.setText("");
     }

     public void cos(View view) {
         cos = true;
         sign.setText("cos");
         input.setText("");
     }

     public void tan(View view) {

         tan = true;
         sign.setText("ten");
         input.setText("");
     }

     public void equal(View view) {
        try{
         if (summation == true) {
             value2 = Float.parseFloat(input.getText() + "");
             input.setText(value1 + value2 + "");
             summation = false;
             sign.setText(null);
         } else if (subtraction == true) {
             value2 = Float.parseFloat(input.getText() + "");
             input.setText(value1 - value2 + "");
             subtraction = false;
             sign.setText(null);
         } else if (multiplication == true) {
             value2 = Float.parseFloat(input.getText() + "");
             input.setText(value1 * value2 + "");
             multiplication = false;
             sign.setText(null);
         } else if (divition == true) {
             value2 = Float.parseFloat(input.getText() + "");
             try {
                 input.setText(value1 / value2 + "");
                 divition = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (log == true) {
             try {
                 value1 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.log10(value1) + "");
                 log = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (ln == true) {
             try {
                 value1 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.log(value1) + "");
                 ln = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (xn == true) {
             try {
                 value2 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.pow(value1, value2) + "");
                 xn = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (root == true) {
             try {
                 value1 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.sqrt(value1) + "");
                 root = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (not == true) {
             num = Integer.parseInt(facto);
             factorial = 1;
             for (int i = 1; i <= num; ++i) {
                 factorial *= i;
             }
             input.setText(factorial + "");
             sign.setText(null);
             not = false;
         } else if (sin == true) {
             try {
                 value1 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.sin(value1) + "");
                 sin = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (cos == true) {
             try {
                 value1 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.cos(value1) + "");
                 cos = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         } else if (tan == true) {
             try {
                 value1 = Float.parseFloat(input.getText() + "");
                 input.setText(Math.tan(value1) + "");
                 tan = false;
                 sign.setText(null);
             } catch (Exception e) {

             }
         }
     }
        catch (Exception e){

        }

     }
 }