import tkinter
import backend


def get_selected_row(event):
    global selected_tuple
    try:
        index=list1.curselection()[0]
        selected_tuple = list1.get(index)
        print(selected_tuple)
        clean_form()
        populate_form()
    except IndexError:
        pass

def view_command():
    list1.delete(0,tkinter.END)
    for row in backend.view():
        list1.insert(tkinter.END, row)

def search_command():
    list1.delete(0,tkinter.END)
    for row in backend.search(
        title_text.get(),
        author_text.get(),
        year_text.get(),
        isbn_text.get()):
        list1.insert(tkinter.END, row)

def add_command():
    backend.insert(
        title_text.get(),
        author_text.get(),
        year_text.get(),
        isbn_text.get())
    search_command()
    clean_form()

def delete_command():
    backend.delete(selected_tuple[0])
    clean_form()

def update_command():
    backend.update(
        selected_tuple[0],  #id
        title_text.get(),
        author_text.get(),
        year_text.get(),
        isbn_text.get())
    view_command()

def clean_form():
    e1.delete(0,tkinter.END)
    e2.delete(0,tkinter.END)
    e3.delete(0,tkinter.END)
    e4.delete(0,tkinter.END)

def populate_form():
    e1.insert(0,selected_tuple[1])
    e2.insert(0,selected_tuple[2])
    e3.insert(0,selected_tuple[3])
    e4.insert(0,selected_tuple[4])

window=tkinter.Tk()
window.wm_title("BookStore")

l1=tkinter.Label(window, text="Title")
l1.grid(row=0, column=0)

l2=tkinter.Label(window, text="Author")
l2.grid(row=0, column=2)

l3=tkinter.Label(window, text="Year")
l3.grid(row=1, column=0)

l4=tkinter.Label(window, text="ISBN")
l4.grid(row=1, column=2)

title_text = tkinter.StringVar()
e1 = tkinter.Entry(window, textvariable=title_text)
e1.grid(row=0, column=1)

author_text = tkinter.StringVar()
e2 = tkinter.Entry(window, textvariable=author_text)
e2.grid(row=0, column=3)

year_text = tkinter.StringVar()
e3 = tkinter.Entry(window, textvariable=year_text)
e3.grid(row=1, column=1)

isbn_text = tkinter.StringVar()
e4 = tkinter.Entry(window, textvariable=isbn_text)
e4.grid(row=1, column=3)

list1=tkinter.Listbox(window, height=6, width=35)
list1.grid(row=2, column=0, rowspan=6, columnspan=2)

sb1=tkinter.Scrollbar(window)
sb1.grid(row=2,column=2,rowspan=6)

list1.configure(yscrollcommand=sb1.set)
sb1.configure(command=list1.yview)

list1.bind('<<ListboxSelect>>', get_selected_row)

b1=tkinter.Button(window, text="View all", width=12, command=view_command)
b1.grid(row=2, column=3)

b2=tkinter.Button(window, text="Search entry", width=12, command=search_command)
b2.grid(row=3, column=3)

b3=tkinter.Button(window, text="Add entry", width=12, command=add_command)
b3.grid(row=4, column=3)

b4=tkinter.Button(window, text="Update", width=12, command=update_command)
b4.grid(row=5, column=3)

b5=tkinter.Button(window, text="Delete", width=12, command=delete_command)
b5.grid(row=6, column=3)

b6=tkinter.Button(window, text="Close", width=12, command=window.destroy)
b6.grid(row=7, column=3)


window.mainloop()
