import os
import time
from tkinter import Tk, Frame, Entry, Button, Label, Listbox, StringVar, messagebox
from app.widgets.abc import ThreadedTab

class TodoListTab(ThreadedTab):

    def __init__(self, root: Frame | Tk, **kwargs):
        self.task = StringVar()
        self.tasks = []
        super().__init__(root, **kwargs)

    def build(self):
        # Create the main frame for the TODO list interface
        self.todo_frame = Frame(self)
        self.todo_frame.pack(fill="both", expand=True)

        # Entry field for adding a task
        self.task_entry = Entry(self.todo_frame, textvariable=self.task)
        self.task_entry.pack(fill="x", padx=5, pady=5)

        # Button to add a task
        self.add_task_button = Button(self.todo_frame, text="Add Task", command=self.add_task)
        self.add_task_button.pack(padx=5, pady=5)

        # Listbox to display tasks
        self.task_listbox = Listbox(self.todo_frame)
        self.task_listbox.pack(fill="both", expand=True, padx=5, pady=5)

        # Button to delete a selected task
        self.delete_task_button = Button(self.todo_frame, text="Delete Selected", command=self.delete_task)
        self.delete_task_button.pack(padx=5, pady=5)

    def add_task(self):
        task_text = self.task.get()
        if task_text:
            self.tasks.append(task_text)
            self.update_task_listbox()
            self.task.set("")  # Clear the entry field
        else:
            messagebox.showwarning("Warning", "Task cannot be empty!")

    def delete_task(self):
        selected_indices = self.task_listbox.curselection()
        if selected_indices:
            for index in selected_indices[::-1]:  # Reverse to avoid index shifting issues
                del self.tasks[index]
            self.update_task_listbox()
        else:
            messagebox.showwarning("Warning", "No task selected to delete!")

    def update_task_listbox(self):
        self.task_listbox.delete(0, "end")
        for task in self.tasks:
            self.task_listbox.insert("end", task)

    def task(self):
        # Placeholder for threaded behavior if needed in the future
        time.sleep(1)