using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button_0_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "0";
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "1";
        }
        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "2";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "3";
        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "4";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "5";
            
        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "6";
        }

        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "7";
        }

        private void button8_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "8";
        }

        private void button9_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "9";
        }


        

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }


        private void division_Click_1(object sender, EventArgs e)
        {
            Dataread();
            Data.mode = '/';
        }

        
        private void multiplication_Click(object sender, EventArgs e)
        {
            Dataread();
            Data.mode = '*';
        }

        private void substraction_Click(object sender, EventArgs e)
        {
            Dataread();
            Data.mode = '-';
        }

        private void addition_Click(object sender, EventArgs e)
        {
            Dataread();
            Data.mode = '+';
        }

        private void enter_Click(object sender, EventArgs e)
        {
            ModeCase();
        }

        

        private void point_Click(object sender, EventArgs e)
        {
            textBox1.Text += ',';
        }

        private void clear_Click(object sender, EventArgs e)
        {
            textBox1.Clear();
            Data.mode = ' ';
            ModeCase();
        }

        public void Dataread()
        {
            bool eredmeny = textBox1.Text.Any(x => !char.IsLetter(x));
            if (eredmeny)
            {
                Data.x = Convert.ToDouble(textBox1.Text);
                textBox1.Clear();
            }
            else
            {
                textBox1.Text = "";
            }
            
            
        }
        

        public void ModeCase()
        {
            switch (Data.mode)
            {
                case '+':
                    Data.y = Convert.ToDouble(textBox1.Text);
                    textBox1.Clear();
                    Data.ans = Data.x + Data.y;
                    textBox1.Text = Data.ans.ToString();
                    break;
                case '-':
                    Data.y = Convert.ToDouble(textBox1.Text);
                    textBox1.Clear();
                    Data.ans = Data.x - Data.y;
                    textBox1.Text = Data.ans.ToString();
                    break;
                case '/':
                    Data.y = Convert.ToDouble(textBox1.Text);
                    textBox1.Clear();
                    if (Data.x != 0)
                    {
                        Data.ans = Data.x / Data.y;
                        textBox1.Text = Data.ans.ToString();
                    }
                    else
                    {
                        textBox1.Text = "Error";
                    }
                    break;
                case '*':
                    Data.y = Convert.ToDouble(textBox1.Text);
                    textBox1.Clear();
                    Data.ans = Data.x * Data.y;
                    textBox1.Text = Data.ans.ToString();
                    break;
                case ' ':
                    Data.x = 0.0;
                    Data.y = 0.0;
                    textBox1.Clear();
                    Data.ans = 0.0;
                    textBox1.Text = "";
                    break;
                default:
                    textBox1.Text = "Error";
                    break;
            }
        }
    }

    public static class Data
    {
        public static double x;
        public static double y;

        public static double ans; 

        public static char mode;
    }
}