import string
import sys
from tkinter import Tk
from tkinter import ttk


def run():
    """
    This sets up a minimal tk application that has enough functionality
    to verify it is "live" and the inputhook is running while waiting for
    user input.
    """
    root = Tk()
    frm = ttk.Frame(root, padding=10)
    frm.grid()
    lbl = ttk.Label(frm, text="push count = 0")
    lbl.grid(column=0, row=0)

    j = 0

    def set_label():
        nonlocal j
        j += 1
        lbl["text"] = f"push count = {j}"

    ttk.Button(frm, text="Push me!", command=set_label).grid(column=1, row=0)

    return root, frm


run()

print("This is a demo of a bug in the non-readline based stdio code\n\n")
print(f"The readline module is not loaded: {'readline' in sys.modules=}")

test_string = (string.ascii_lowercase + string.ascii_uppercase) * 2

print(
    f"""
We are using the test string :

\t{test_string}

as it is easy to eyeball the length (it is 104 characters long in 26
character blocks).

You should see a tk window with a button that says "Push me!" and a counter.
Pushing the button should increment the counter.

Follow the instructions to demonstrate the bug.


"""
)

print(
    f"""
To see a case where it works paste

{test_string[:10]}

into the prompt below.  Before hitting return, try pushing
the button on the UI to verify that the inputhook is running.
"""
)

a = input("paste here >> ")
print(f"You pasted {a}")


print(
    f"""
To see it fail past the full string

{test_string}

into the prompt below (you will have to hit enter twice)
"""
)

a = input("paste here >> ")
print(f"You pasted {a}")

print("There is still a newline in the buffer, this input will be 'skipped'\n")
a = input("you can not input here >> ")
print(f"we got an empty string!: {a=!r} (also note no new line in stdout)")


print(
    f"""

you can now play with it or ctrl-d to exit.

The longest string that works is (98 letters + new line):

{test_string[:98]}

"""
)

while True:
    print("\n")
    a = input("test input >> ")
    print(f"what you entered: {a=}")