import tkinter as tk
from expression import *

class Interface(tk.Frame):
    def __init__(self, master):
        self.master = master
        tk.Frame.__init__(self, master)
        
        self.saisie_expression = tk.Entry(self.master)
        self.saisie_expression.grid(row=0, column=0)
        self.saisie_expression.bind("<Return>", lambda e : self.evaluer())
        self.saisie_expression.bind("<KP_Enter>", lambda e : self.evaluer())
        
        
        btn_calculer = tk.Button(self.master, text='évaluer', command=self.evaluer)
        btn_calculer.grid(row=0, column=2)
        
        self.affichage_expression = tk.Label(self.master)
        self.affichage_expression.grid(row=1, column=0)
        
        tk.Label(self.master, text = "=").grid(row=1, column=1)
        
        self.res = tk.Label(self.master)
        self.res.grid(row=1, column=2)

        
    def evaluer(self):
        lst_expr = self.saisie_expression.get().split()
        try:
            arbre_expr = npi2tree(lst_expr)
            self.affichage_expression.config(text = str(arbre_expr))
            self.res.config(text = arbre_expr.evalue())
        except IndexError:
            self.affichage_expression.config(text = "Erreur")
            self.res.config(text = "Erreur")
        
        
        

    
if __name__ == "__main__":
    root = tk.Tk()
    root.title("Calculatrice")
    root.geometry("350x500")
    hello_frame = Interface(root)
    hello_frame.mainloop()