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 calculator
{


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

        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text += "7";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox1.Text += "8";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text += "9";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            textBox1.Text += "4";
        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text += "5";
        }

        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text += "6";
        }

        private void button9_Click(object sender, EventArgs e)
        {
            textBox1.Text += "1";
        }

        private void button10_Click(object sender, EventArgs e)
        {
            textBox1.Text += "2";
        }

        private void button11_Click(object sender, EventArgs e)
        {
            textBox1.Text += "3";
        }

        private void button13_Click(object sender, EventArgs e)
        {
            textBox1.Text += "^";
        }

        private void button14_Click(object sender, EventArgs e)
        {
            textBox1.Text += "0";
        }

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

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

        private void button12_Click(object sender, EventArgs e)
        {
            textBox1.Text += "*";
        }

        private void button16_Click(object sender, EventArgs e)
        {
            textBox1.Text += "/";
        }
        private void button20_Click(object sender, EventArgs e)
        {
            textBox1.Text += "√";
        }

        private void button15_Click(object sender, EventArgs e)
        {
            try
            {
                            int t = 0;
            if (textBox1.Text.Contains("+"))
            {
                t = textBox1.Text.IndexOf("+");
            }
            else if (textBox1.Text.Contains("-"))
            {
                t = textBox1.Text.IndexOf("-");
            }
            else if (textBox1.Text.Contains("*"))
            {
                t = textBox1.Text.IndexOf("*");
            }
            else if (textBox1.Text.Contains("/"))
            {
                t = textBox1.Text.IndexOf("/");
            }
                else if (textBox1.Text.Contains("^"))
                {
                    t = textBox1.Text.IndexOf("^");
                }
                else if (textBox1.Text.Contains("√"))
                {
                    t = textBox1.Text.IndexOf("√");
                }

                string x = textBox1.Text.Substring(t,1);
            double x1 = Convert.ToDouble(textBox1.Text.Substring(0,t));
            double x2 = Convert.ToDouble(textBox1.Text.Substring(t+1,textBox1.Text.Length-t-1));
            if (x == "+")
            {
                listBox1.Items.Add(textBox1.Text + "=" + (x1 + x2));
                textBox1.Text = (x1 + x2).ToString();
            }
            else if (x == "-")
            {
                listBox1.Items.Add(textBox1.Text + "=" + (x1 - x2));
                textBox1.Text = (x1 - x2).ToString();
            }
            else if (x == "*")
            {
                listBox1.Items.Add(textBox1.Text + "=" + (x1 * x2));
                textBox1.Text = (x1 * x2).ToString();
            }
            else if (x == "/")
            {
                listBox1.Items.Add(textBox1.Text + "=" + (x1 / x2));
                textBox1.Text = (x1 /x2).ToString();
            }
                else if (x == "^")
                {
                    listBox1.Items.Add(textBox1.Text + "=" + Math.Pow(x1 , x2));
                    textBox1.Text = Math.Pow(x1 , x2).ToString();
                }
                else if (x == "√")
                {
                    listBox1.Items.Add(textBox1.Text + "=" + Math.Pow(x1,1 / x2));
                    textBox1.Text = Math.Pow(x1,1 / x2).ToString();
                }

            }
            catch
            {

                textBox1.Text = "error";
            }
        }

        private void button17_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button18_Click(object sender, EventArgs e)
        {
            using (System.IO.StreamWriter SaveFile = new System.IO.StreamWriter(@"C:\Users\admin\Desktop\calculator\Logi.txt"))
            {
                foreach (var item in listBox1.Items)
                {
                    SaveFile.WriteLine(item.ToString());
                }
            }
        }

        private void editLast_Click(object sender, EventArgs e)
        {
            textBox1.Text = listBox1.Items[listBox1.Items.Count - 1].ToString();
            listBox1.Items.RemoveAt(listBox1.Items.Count - 1);
        }
    }
}