import streamlit as st
from datetime import datetime, timedelta
import random
import logging

# Sample data structure for user_tasks
if 'user_tasks' not in st.session_state:
    st.session_state.user_tasks = {}

# Initialize user preferences (this can also be loaded from a database or file if needed)
if 'user_preferences' not in st.session_state:
    st.session_state.user_preferences = {"name": None, "email": None}
    st.session_state.logged_in = False

# Initialize the logger
logging.basicConfig(filename='app.log', level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

# Helper functions
def generate_numeric_id():
    return int(datetime.now().timestamp() * 1000)

# Login form
def login():
    st.title("Login")
    username = st.text_input("Enter your name")
    email = st.text_input("Enter your email")
    if st.button("Login"):
        if username and email:
            # Set session state for logged-in user
            st.session_state.user_preferences['name'] = username
            st.session_state.user_preferences['email'] = email
            st.session_state.logged_in = True
            logging.info(f"User logged in: {username}")
        else:
            st.warning("Please enter both name and email.")

# Logout function
def logout():
    st.session_state.logged_in = False
    st.session_state.user_preferences['name'] = None
    st.session_state.user_preferences['email'] = None
    st.success("Logged out successfully.")

# Display tasks based on the selected section
def display_tasks(tasks):
    for task in tasks:
        st.write(f"Task: {task['text']} - Due Date: {task['date']} - Completed: {task['completed']}")

# Main App Logic
if st.session_state.logged_in:
    st.sidebar.title(f"Welcome, {st.session_state.user_preferences['name']}!")
    
    if st.sidebar.button("Logout"):
        logout()  # Clear session to log out
    
    # Task Input Form
    st.subheader("Add a New Task")
    with st.form("add_task_form"):
        task_text = st.text_input("Task Description")
        due_date = st.date_input("Due Date")
        if st.form_submit_button("Add Task"):
            task_id = generate_numeric_id()
            st.session_state.user_tasks[task_id] = {
                "id": task_id,
                "text": task_text,
                "date": due_date.strftime('%Y-%m-%d'),
                "completed": False
            }
            st.success("Task added successfully.")

    # Display Tasks
    st.subheader("Your Tasks")
    display_tasks(st.session_state.user_tasks.values())

    # Clear All Tasks
    if st.button("Delete All Tasks"):
        st.session_state.user_tasks.clear()
        st.success("All tasks deleted.")
else:
    # Render login form if the user is not logged in
    login()