import gradio as gr

tasks = []

def add_task(task):
    """Add a new task."""
    if task.strip():
        tasks.append({"task": task.strip(), "done": False})

    choices = [(f"{'✅' if t['done'] else '⬜'} {t['task']}", i) for i, t in enumerate(tasks)]
    return "", gr.CheckboxGroup(choices=choices, value=[])

def update_completed(selected):
    """Update completed tasks."""
    for i, task in enumerate(tasks):
        task["done"] = i in selected

    choices = [(f"{'✅' if t['done'] else '⬜'} {t['task']}", i) for i, t in enumerate(tasks)]
    values = [i for i, t in enumerate(tasks) if t["done"]]

    return gr.CheckboxGroup(choices=choices, value=values)

def refresh():
    """Remove completed tasks."""
    global tasks
    tasks = [t for t in tasks if not t["done"]]

    choices = [(f"{'✅' if t['done'] else '⬜'} {t['task']}", i) for i, t in enumerate(tasks)]
    values = [i for i, t in enumerate(tasks) if t["done"]]

    return gr.CheckboxGroup(choices=choices, value=values)

def create_tasks():

    with gr.Column() as tasks:
        gr.Markdown("# 📝 Interactive To-Do List")

        with gr.Row():
            task_input = gr.Textbox(
                placeholder="Enter a task...",
                label="New Task"
            )
            add_btn = gr.Button("➕ Add Task")

        todo_list = gr.CheckboxGroup(
            choices=[],
            value=[],
            label="Your Tasks"
        )

        refresh_btn = gr.Button("🔄 Refresh (Remove Completed)")

        add_btn.click(
            fn=add_task,
            inputs=task_input,
            outputs=[task_input, todo_list]
        )

        todo_list.change(
            fn=update_completed,
            inputs=todo_list,
            outputs=todo_list
        )

        refresh_btn.click(
            fn=refresh,
            inputs=None,
            outputs=todo_list
        )

    return tasks