app.py

import streamlit as st
from datetime import datetime

# Application title
st.set_page_config(page_title="To-Do Notebook", page_icon="📝", layout="centered")

# App header
st.title("📝 To-Do Notebook")
st.subheader("Organize your tasks with ease!")

# App description
st.write("Add your tasks, check them off, and delete them when you're done.")

# Initialize task list in the session state
if "tasks" not in st.session_state:
    st.session_state.tasks = []

# Function to add a task
def add_task(task_name, priority, deadline):
    if task_name:
        st.session_state.tasks.append({
            "task": task_name,
            "priority": priority,
            "deadline": deadline,
            "completed": False
        })
        st.success(f"Task '{task_name}' added!")

# Function to toggle task completion
def toggle_completion(index):
    st.session_state.tasks[index]["completed"] = not st.session_state.tasks[index]["completed"]

# Function to delete a task
def delete_task(index):
    st.session_state.tasks.pop(index)
    st.success("Task deleted!")

# Add task section
with st.expander("➕ Add a New Task"):
    task_name = st.text_input("Task Name", placeholder="Enter task here...")
    priority = st.selectbox("Priority", ["Low", "Medium", "High"])
    deadline = st.date_input("Deadline")
    if st.button("Add Task"):
        add_task(task_name, priority, deadline)

# Show tasks
if st.session_state.tasks:
    st.subheader("📋 Your Tasks")
    for i, task in enumerate(st.session_state.tasks):
        col1, col2, col3 = st.columns([5, 2, 1])

        # Display task with checkbox
        with col1:
            st.checkbox(
                f"({task['priority']}) {task['task']} - Due: {task['deadline']}",
                value=task["completed"],
                on_change=toggle_completion,
                args=(i,)
            )
        # Delete button
        with col3:
            if st.button("🗑️", key=f"delete_{i}"):
                delete_task(i)
else:
    st.info("You have no tasks. Add a new task to get started!")

# Footer
st.write("---")
st.write("✨ Made with ❤️ using Streamlit")

# Run Streamlit locally or deploy
!streamlit run app.py