[Python] I created fdm addon that put track number in the download of playlist with elephant

I created fdm addon that add trackk number to the download playlist when try in to donwload playlist it prompt you to add track numbers in the playlist but when i finished evrything and craeted the fdm addon which is addtrack.fda and loaded in fdm it tell me unknown error and when i checked the log of fdm it say performance issue so my code is like this manifest.json

{
"id": "addtrack",
"name": "Add Track Numbers",
"description": "Adds track numbers to playlist filenames in order.",
"version": "1.0.0",
"minApiVersion": 4,
"minFeaturesLevel": 2,
"author": "Mohamed Subarashi",
"authorUrl": "https://www.facebook.com/mohamedsubarashi",
"icon": "icon.png",
"dependencies": {
"Python": { "minVersion": "3.9" }
},
"entry": "main.py",
"permissions": ["launchPython"]
}


my fdm main.py

import os
import json
import tkinter as tk
from tkinter import filedialog
from pathlib import Path
import getpass

CONFIG_FILE = os.path.join(os.path.dirname(__file__), "config.json")
SUPPORTED_EXTS = [".m3u", ".txt", ".json"]

def load_config():
if os.path.exists(CONFIG_FILE):
with open(CONFIG_FILE, "r", encoding="utf-8") as f:
return json.load(f)
return {"remember": False, "enabled": None}

def save_config(remember, enabled):
with open(CONFIG_FILE, "w", encoding="utf-8") as f:
json.dump({"remember": remember, "enabled": enabled}, f)

def prompt_user_gui(config):
result = {"enabled": None, "remember": False}
def on_yes():
result["enabled"] = True
result["remember"] = remember_var.get()
if result["remember"]:
save_config(True, True)
root.destroy()

def on_no():
result["enabled"] = False
result["remember"] = remember_var.get()
if result["remember"]:
save_config(True, False)
root.destroy()

root = tk.Tk()
root.title("Add Track Numbers?")
root.geometry("340x140")
root.resizable(False, False)

tk.Label(root, text="Add track numbers to playlist filenames?", pady=10).pack()

remember_var = tk.BooleanVar()
tk.Checkbutton(root, text="Remember my choice", variable=remember_var).pack()

button_frame = tk.Frame(root)
button_frame.pack(pady=10)
tk.Button(button_frame, text="Yes", width=10, command=on_yes).pack(side=tk.LEFT, padx=10)
tk.Button(button_frame, text="No", width=10, command=on_no).pack(side=tk.RIGHT, padx=10)

root.mainloop()
config["enabled"] = result["enabled"]
config["remember"] = result["remember"]
return config

def apply_track_numbers(file_path):
try:
with open(file_path, 'r', encoding='utf-8') as f:
lines = [line.strip() for line in f.readlines() if line.strip()]
except Exception:
print(f"⚠️ Couldn't read file: {file_path}")
return

updated = []
for i, line in enumerate(lines):
if not line.lower().endswith(('.mp4', '.mkv', '.mp3', '.avi')):
updated.append(line)
continue
filename = os.path.basename(line)
directory = os.path.dirname(line)
new_filename = f"{str(i + 1).zfill(3)}. {filename}"
new_path = os.path.join(directory, new_filename)
updated.append(new_path)

with open(file_path, 'w', encoding='utf-8') as f:
f.write('\n'.join(updated))
print(f"✔️ Modified: {file_path}")

def scan_fdm_folder():
user = getpass.getuser()
base_paths = [
f"C:/Users/{user}/Downloads",
f"C:/Users/{user}/AppData/Roaming/FDM",
f"C:/Users/{user}/AppData/Local/Free Download Manager"
]
found = []
for path in base_paths:
if os.path.exists(path):
try:
for file in os.listdir(path):
if Path(file).suffix.lower() in SUPPORTED_EXTS:
found.append(os.path.join(path, file))
except Exception:
continue
return found

def drop_file_interface():
root = tk.Tk()
root.withdraw()
file_path = filedialog.askopenfilename(
title="Drop a playlist file or browse manually",
filetypes=[("Playlist Files", "*.txt *.m3u *.json")]
)
return file_path

def main():
config = load_config()

files = scan_fdm_folder()
if not files:
file = drop_file_interface()
if not file:
print("No file selected.")
return
files = [file]

if not config.get("remember"):
config = prompt_user_gui(config)

if config.get("enabled"):
for f in files:
apply_track_numbers(f)
else:
print("Track numbering not applied.")

if __name__ == "__main__":
main()


Please help me to fix this issue.

I want it to work which is not working correctly.

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