"""
program that stores book information

title       author
year        ISBN


                view all
listbox         search
                add
                update
                delete
                close

"""
from tkinter import *

# import our functions
import backend

# glue functions

def get_selected_row(event):
    try:
        global selected_tuple
        index=list1.curselection()[0] # error on update - tuple index out of range
        selected_tuple=list1.get(index)
        e1.delete(0,END)
        e1.insert(END,selected_tuple[1])
        e2.delete(0,END)
        e2.insert(END,selected_tuple[2])
        e3.delete(0,END)
        e3.insert(END,selected_tuple[3])
        e4.delete(0,END)
        e4.insert(END,selected_tuple[4])
    except IndexError:
        pass


def view_command():
    """
    END indicates always append each row
    """
    list1.delete(0,END)
    for row in backend.view():
        list1.insert(END, row)

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


def add_command():
    backend.insert(title_text.get(),author_text.get(),year_text.get(),isbn_text.get())
    list1.delete(0,END)
    list1.insert(END,(title_text.get(),author_text.get(),year_text.get(),isbn_text.get()))

def update_command():
    backend.update(selected_tuple[0], title_text.get(),author_text.get(),year_text.get(),isbn_text.get())
    print(selected_tuple[0], title_text.get(),author_text.get(),year_text.get(),isbn_text.get())
    list1.delete(0,END)
    list1.insert(END,title_text.get(),author_text.get(),year_text.get(),isbn_text.get())


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


def delete_command():
    """
    my refresh hack
    """
    backend.delete(selected_tuple[0])
    list1.delete(0,END)
    view_command()


def close_command():
    pass

#main tk
window=Tk()
window.wm_title("Bob's Bookstore")

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

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

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

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

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

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

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

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

# listbox
list1 = Listbox(window,height=10,width=35)
list1.grid(row=2,column=0,rowspan=6,columnspan=2)
# scrollbar
sb1=Scrollbar(window)
sb1.grid(row=2,column=2,rowspan=6)

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

# binding a method to a function
list1.bind('<<ListboxSelect>>',get_selected_row)

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

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

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

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

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

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

window.mainloop()