package com.example.calculator;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private final int STANDARD_REQUEST_CODE = 1;
    private EditText firstNumber;
    private EditText secondNumber;
    private EditText name;
    private EditText age;
    private EditText result;
    private Button btnMultiply;
    private Button btnDivide;
    private Button btnAdd;
    private Button btnSubtract;
    private Button btnFactor;
    private SharedPreferences sharedPreferences;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        firstNumber = findViewById(R.id.txtNum);
        secondNumber = findViewById(R.id.txtNum2);
        result = findViewById(R.id.txtResult);
        name = findViewById(R.id.txtName);
        age = findViewById(R.id.txtAge);
        btnAdd = findViewById(R.id.btnAdd);
        btnSubtract = findViewById(R.id.btnSubtract);
        btnDivide = findViewById(R.id.btnDivide);
        btnMultiply = findViewById(R.id.btnMultiply);
        btnFactor = findViewById(R.id.btnFactor);
        sharedPreferences = getSharedPreferences("general prefs", MODE_PRIVATE);



        btnAdd.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view){
                String firstField = firstNumber.getText().toString();
                String secondField = secondNumber.getText().toString();
                if(firstField.matches("") || secondField.matches("")) {
                    Toast.makeText(MainActivity.this, "You did not enter enough information", Toast.LENGTH_SHORT).show();
                    return;
                } else {
                    int calculationResult = Add(Integer.parseInt(firstNumber.getText().toString()), Integer.parseInt(secondNumber.getText().toString()));
                    result.setText(String.valueOf(calculationResult));
                }
            }
        });

        btnSubtract.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                String firstField = firstNumber.getText().toString();
                String secondField = secondNumber.getText().toString();
                if(firstField.matches("") || secondField.matches("")) {
                    Toast.makeText(MainActivity.this, "You did not enter enough information", Toast.LENGTH_SHORT).show();
                    return;
                } else {
                    int calculationResult = Subtract(Integer.parseInt(firstNumber.getText().toString()), Integer.parseInt(secondNumber.getText().toString()));
                    result.setText(String.valueOf(calculationResult));
                }
            }
        });

        btnMultiply.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                String firstField = firstNumber.getText().toString();
                String secondField = secondNumber.getText().toString();
                if(firstField.matches("") || secondField.matches("")) {
                    Toast.makeText(MainActivity.this, "You did not enter enough information", Toast.LENGTH_SHORT).show();
                    return;
                } else {
                    int calculationResult = Multiply(Integer.parseInt(firstNumber.getText().toString()), Integer.parseInt(secondNumber.getText().toString()));
                    result.setText(String.valueOf(calculationResult));
                }
            }
        });

        btnDivide.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                String firstField = firstNumber.getText().toString();
                String secondField = secondNumber.getText().toString();
                if(firstField.matches("") || secondField.matches("")) {
                    Toast.makeText(MainActivity.this, "You did not enter enough information", Toast.LENGTH_SHORT).show();
                    return;
                } else {
                    int calculationResult = Divide(Integer.parseInt(firstNumber.getText().toString()), Integer.parseInt(secondNumber.getText().toString()));
                    result.setText(String.valueOf(calculationResult));
                }
            }
        });

        btnFactor.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                String secondField = secondNumber.getText().toString();
                if(secondField.matches("")) {
                    int calculationResult = Factorial(Integer.parseInt(firstNumber.getText().toString()));
                    result.setText(String.valueOf(calculationResult));
                }else{
                    Toast.makeText(MainActivity.this, "Please remove the second number", Toast.LENGTH_SHORT).show();
                    return;
                }
            }
        });

    }

    public void startSaveActivity(View v) {

        if (v.getId() == R.id.btnNext) {

            Intent intent = new Intent(this, SaveActivity.class);

            startActivityForResult(intent, STANDARD_REQUEST_CODE);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {

        } // What do i put for else here?

    }

    public int Add(int firstNumber, int secondNumber) {
        int result = firstNumber + secondNumber;
        return result;
    }

    public int Subtract(int firstNumber, int secondNumber){
        int result = firstNumber - secondNumber;
        return result;
    }

    public int Multiply(int firstNumber, int secondNumber){
        int result = firstNumber * secondNumber;
        return result;
    }

    public int Divide(int firstNumber, int secondNumber){
        int result = firstNumber/secondNumber;
        return result;
    }

    public int Factorial(int number){
        int factorial = 1;

        for(int i = 1; i<=number;i++){
            factorial = factorial*i;
        }

        return factorial;
    }
}