from tkinter import *
import re
from math import *


class Calculator:

    def __init__(self, master):
        self.write_area = Entry(master, justify=RIGHT)
        self.write_area.grid(row=0, columnspan=6, sticky=W + E, ipady=6, pady=6)

        self.scrollbarY = Scrollbar(master, orient=VERTICAL, command=self.score_area_yview)
        self.scrollbarY.grid(row=1, rowspan=4, column=7, sticky=N + S)
        self.scrollbarX = Scrollbar(master, orient=HORIZONTAL, command=self.score_area_xview)
        self.scrollbarX.grid(row=5, column=6, sticky=W+E)

        self.score_area = Text(master, width=40, height=10, wrap=NONE)
        self.score_area.grid(row=1, rowspan=4, column=6)
        self.score_area['yscrollcommand'] = self.scrollbarY.set
        self.score_area['xscrollcommand'] = self.scrollbarX.set

        self.score_area_text = Label(master, text="The result is:").grid(row=0, column=6, sticky=W + E)

        self.type = Label(master, text="Simple version").grid(row=5, column=0, columnspan=6)

        self.button7 = Button(text="7", height=2, width=8, command=lambda: self.write_area.insert(END, "7")).grid(
            column=0, row=1)
        self.button8 = Button(text="8", height=2, width=8, command=lambda: self.write_area.insert(END, "8")).grid(
            row=1, column=1)
        self.button9 = Button(text="9", height=2, width=8, command=lambda: self.write_area.insert(END, "9")).grid(
            row=1, column=2)
        self.buttonPlus = Button(text="+", height=2, width=8, command=lambda: self.write_area.insert(END, "+")).grid(
            row=1, column=3)
        self.buttonSquare = Button(text="x²", height=2, width=8, command=self.square).grid(row=1, column=4)
        self.buttonC = Button(text="C", height=2, width=8, command=lambda: self.write_area.delete(0, END)).grid(
            row=2, column=5)

        self.button4 = Button(text="4", height=2, width=8, command=lambda: self.write_area.insert(END, "4")).grid(
            row=2, column=0)
        self.button5 = Button(text="5", height=2, width=8, command=lambda: self.write_area.insert(END, "5")).grid(
            row=2, column=1)
        self.button6 = Button(text="6", height=2, width=8, command=lambda: self.write_area.insert(END, "6")).grid(
            row=2, column=2)
        self.buttonMinus = Button(text="-", height=2, width=8, command=lambda: self.write_area.insert(END, "-")).grid(
            row=2, column=3)
        self.buttonSqrt = Button(text="√", height=2, width=8, command=self.sqrt).grid(row=2, column=4)
        self.buttonBackspace = Button(text="←", height=2, width=8, command=self.clear_last).grid(row=1, column=5)

        self.button1 = Button(text="1", height=2, width=8, command=lambda: self.write_area.insert(END, "1")).grid(
            row=3, column=0)
        self.button2 = Button(text="2", height=2, width=8, command=lambda: self.write_area.insert(END, "2")).grid(
            row=3, column=1)
        self.button3 = Button(text="3", height=2, width=8, command=lambda: self.write_area.insert(END, "3")).grid(
            row=3, column=2)
        self.buttonMulti = Button(text="*", height=2, width=8, command=lambda: self.write_area.insert(END, "*")).grid(
            row=3, column=3)
        self.buttonSquareY = Button(text="xʸ", height=2, width=8, command=self.squareY).grid(row=3, column=4)
        self.buttonCE = Button(text="CE", height=2, width=8, command=self.clear).grid(row=3, column=5)

        self.button0 = Button(text="0", height=2, width=8, command=lambda: self.write_area.insert(END, "0")).grid(
            row=4, column=1)
        self.buttonDot = Button(text=".", height=2, width=8, command=lambda: self.write_area.insert(END, ".")).grid(
            row=4, column=0)
        self.buttonEqual = Button(text="=", height=2, width=8, command=self.equal).grid(row=4, column=2)
        self.buttonDiv = Button(text="/", height=2, width=8).grid(row=4, column=3)
        self.buttonLeftPar = Button(text="(", height=2, width=8, command=lambda: self.write_area.insert(END, "(")).grid(
            row=4, column=4)
        self.buttonRightPar = Button(text=")", height=2, width=8, command=lambda: self.write_area.insert(END, ")")).\
            grid(row=4, column=5)
        master.bind('<BackSpace>', self.clear_last)
        master.bind('<Delete>', self.clear)
        master.bind('<KP_Enter>', self.equal)


    def score_area_yview(self, *L):
        op, howMany = L[0], L[1]

        if op == 'scroll':
            units = L[2]
            self.score_area.yview_scroll(howMany, units)
        elif op == 'moveto':
            self.score_area.yview_moveto(howMany)

    def score_area_xview(self, *L):
        op, howMany = L[0], L[1]

        if op == 'scroll':
            units = L[2]
            self.score_area.xview_scroll(howMany, units)
        elif op == 'moveto':
            self.score_area.xview_moveto(howMany)

    def equal(self, event=None):
        equation = self.write_area.get()
        self.score_area.insert(1.0, self.write_area.get() + "=" + str(eval(compile(equation, '<string>', 'eval'))) + "\n")
        self.write_area.delete(0, END)
        self.write_area.insert(0, str(eval(compile(equation, '<string>', 'eval'))))


    def clear_last(self, event=None):
        get_length = len(self.write_area.get())
        self.write_area.delete(get_length - 1)


    def clear(self, event=None):
        self.write_area.delete(0, END)
        self.score_area.delete(1.0, END)

    def square(self):
        equation = self.write_area.get()
        result = eval(compile(equation, '<string>', 'eval')) ** 2
        self.write_area.delete(0, END)
        self.write_area.insert(0, str(result))
        self.score_area.insert(1.0, equation + "**2" + "=" + str(result))

    def squareY(self):
        check = self.write_area.get()
        check2 = re.search(r'\d+', check).span()
        if len(check) == check2[1]:
            self.write_area.insert(END, "**")
        elif self.write_area.get()[0] == "(":
            self.write_area.insert(END, "**(")
        else:
            self.write_area.insert(0, "(")
            self.write_area.insert(END, ")**(")

    def sqrt(self):
        number = eval(compile(self.write_area.get(), '<string>', 'eval'))
        self.score_area.insert(1.0, "√(" + self.write_area.get() + ")=" + str(sqrt(number)) + "\n")
        self.write_area.delete(0, END)
        self.write_area.insert(0, str(number))

root = Tk()

a = Calculator(root)

root.mainloop()