import re
import tkinter as tk
import tkinter.filedialog as tkfd
import tkinter.messagebox as tkm

root = tk.Tk()
root.rowconfigure(0, weight=1)
root.rowconfigure(0, weight=3)
root.columnconfigure(0, weight=1)
root.columnconfigure(1, weight=1)
root.columnconfigure(2, weight=1)

content = ""
content_lines = list()
newcontent = ""
fname = ""

def load_file(event=None):
    global content
    global content_lines
    global fname
    fname = tkfd.askopenfilename(filetypes=(("CSV files","*.csv"),("text files","*.txt")))
    try:
        f = open(fname, mode='r')
        content = f.read()
        f.seek(0)
        for line in f:
            content_lines.append(line)
        t_preview.insert(0.0,content)
        f.close()
    except:
        tkm.showerror(title="Fehler beim Öffnen",
                      message="Öffnen der Datei fehlgeschlagen.")

def clean(event=None):
    global content_lines
    global newcontent
    newcontent = ""
    t_preview.delete(0.0,tk.END)
    for line in content_lines:
        newline = re.sub(r"\s[(][a-zA-Zäöü\s]*[)]", "", line) # Fächer
        newline = re.sub(r'["]', "", newline) # Anführungszeichen
        tc = re.split(',', newline)
        tc = [e.strip() for e in tc]
        print(tc)
        # Umsortieren
        tcnew = [tc[-1]] + [tc[1]] + [tc[0]] + tc[2:-1]
        tcnew[-1] = tcnew[-1] + "\n"
        newline = ",".join(tcnew)
        newcontent += newline
    t_preview.insert(0.0,newcontent)
    

def save_file(event=None):
    global fname
    global newcontent

    if fname == "":
        tkm.showerror(title="Fehler beim Speichern",
                      message="Speichern fehlgeschlagen")
        return 1
    
    fname_new = fname[:-4] + "c" + ".csv"
    try:
        f = open(fname_new, mode='w')
        f.write(newcontent)
        tkm.showinfo(title="Gespeichert",
                      message="Datei unter {} gespeichert.".format(fname_new))
    except:
        tkm.showerror(title="Fehler beim Speichern",
                      message="Speichern fehlgeschlagen")

bt_choose_file = tk.Button(root, text="Datei auswählen")
bt_choose_file.grid(row=0, column=0)
bt_choose_file["command"] = load_file

bt_clean = tk.Button(root, text="Bereinigen")
bt_clean.grid(row=0, column=1)
bt_clean["command"] = clean

bt_save_file = tk.Button(root, text="Speichern")
bt_save_file.grid(row=0, column=2)
bt_save_file["command"] = save_file

bt_quit = tk.Button(root, text="Beenden", fg="red")
bt_quit.grid(row=0, column=3)
bt_quit["command"] = root.destroy

t_preview = tk.Text(root, height = 10, width = 150)
t_preview.grid(row=1, column=0, columnspan=3, sticky="nwse")

root.mainloop()