Code Editor for app.py

import streamlit as st
import pandas as pd
from datetime import datetime
import uuid

# Set up page config
st.set_page_config(page_title="Task Manager", layout="wide")

# Initialize session state variables if they don't exist
if "tasks" not in st.session_state:
    st.session_state.tasks = []

if "filtered_tasks" not in st.session_state:
    st.session_state.filtered_tasks = []

if "filter_status" not in st.session_state:
    st.session_state.filter_status = "All"

# Function to add a new task
def add_task(title, description, due_date, priority, status="To Do"):
    task = {
        "id": str(uuid.uuid4()),
        "title": title,
        "description": description,
        "due_date": due_date,
        "priority": priority,
        "status": status,
        "created_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    }
    st.session_state.tasks.append(task)
    apply_filters()  # Update filtered tasks

# Function to delete a task
def delete_task(task_id):
    st.session_state.tasks = [task for task in st.session_state.tasks if task["id"] != task_id]
    apply_filters()  # Update filtered tasks

# Function to update task status
def update_status(task_id, new_status):
    for task in st.session_state.tasks:
        if task["id"] == task_id:
            task["status"] = new_status
    apply_filters()  # Update filtered tasks

# Function to apply filters
def apply_filters():
    filter_status = st.session_state.filter_status
    
    if filter_status == "All":
        st.session_state.filtered_tasks = st.session_state.tasks
    else:
        st.session_state.filtered_tasks = [task for task in st.session_state.tasks 
                                          if task["status"] == filter_status]

# App title
st.title("Task Manager")

# Sidebar with filters
with st.sidebar:
    st.header("Filters")
    status_filter = st.selectbox(
        "Filter by Status",
        ["All", "To Do", "In Progress", "Done"],
        key="status_filter",
        on_change=lambda: setattr(st.session_state, 'filter_status', st.session_state.status_filter)
    )
    
    # Apply filters button
    if st.button("Apply Filters"):
        apply_filters()
    
    # Add sample tasks button
    if st.button("Add Sample Tasks"):
        sample_tasks = [
            {
                "id": str(uuid.uuid4()),
                "title": "Complete Project Proposal",
                "description": "Draft the initial proposal for the client project",
                "due_date": "2023-12-15",
                "priority": "High",
                "status": "To Do",
                "created_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S")
            },
            {
                "id": str(uuid.uuid4()),
                "title": "Weekly Team Meeting",
                "description": "Prepare agenda for weekly sync",
                "due_date": "2023-12-10",
                "priority": "Medium",
                "status": "In Progress",
                "created_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S")
            },
            {
                "id": str(uuid.uuid4()),
                "title": "Review Code Changes",
                "description": "Review and approve pull requests",
                "due_date": "2023-12-08",
                "priority": "Low",
                "status": "Done",
                "created_at": datetime.now().strftime("%Y-%m-%d %H:%M:%S")
            }
        ]
        st.session_state.tasks.extend(sample_tasks)
        apply_filters()

# Add new task form
st.header("Add New Task")
with st.form(key="task_form", clear_on_submit=True):
    col1, col2 = st.columns(2)
    
    with col1:
        title = st.text_input("Task Title", max_chars=50)
        priority = st.selectbox("Priority", ["Low", "Medium", "High"])
    
    with col2:
        due_date = st.date_input("Due Date")
        status = st.selectbox("Status", ["To Do", "In Progress", "Done"])
    
    description = st.text_area("Description", max_chars=200)
    
    submitted = st.form_submit_button("Add Task")
    
    if submitted and title:
        add_task(
            title=title,
            description=description,
            due_date=due_date.strftime("%Y-%m-%d"),
            priority=priority,
            status=status
        )
        st.success(f"Task '{title}' added successfully!")

# Apply initial filter if not done already
if not st.session_state.filtered_tasks and st.session_state.tasks:
    apply_filters()

# Display tasks
st.header("Tasks")

# Initialize column configuration
priority_colors = {
    "High": "🔴",
    "Medium": "🟡",
    "Low": "🟢"
}

# Create tabs for different views
tab1, tab2 = st.tabs(["Card View", "Table View"])

with tab1:
    if not st.session_state.filtered_tasks:
        st.info("No tasks found. Add a new task or change filters.")
    else:
        # Create rows with 3 cards each
        for i in range(0, len(st.session_state.filtered_tasks), 3):
            cols = st.columns(3)
            for j in range(3):
                if i + j < len(st.session_state.filtered_tasks):
                    task = st.session_state.filtered_tasks[i + j]
                    with cols[j]:
                        with st.container(border=True):
                            st.subheader(task["title"])
                            st.caption(f"Due: {task['due_date']} | {priority_colors[task['priority']]} {task['priority']}")
                            st.write(task["description"])
                            
                            status_col, action_col = st.columns([3, 1])
                            with status_col:
                                new_status = st.selectbox(
                                    "Status",
                                    ["To Do", "In Progress", "Done"],
                                    index=["To Do", "In Progress", "Done"].index(task["status"]),
                                    key=f"status_{task['id']}",
                                    on_change=update_status,
                                    args=(task["id"], st.session_state[f"status_{task['id']}"]),
                                )
                            with action_col:
                                if st.button("Delete", key=f"delete_{task['id']}"):
                                    delete_task(task["id"])
                                    st.rerun()

with tab2:
    if not st.session_state.filtered_tasks:
        st.info("No tasks found. Add a new task or change filters.")
    else:
        # Convert tasks to DataFrame for table view
        df = pd.DataFrame(st.session_state.filtered_tasks)
        df = df[["title", "description", "due_date", "priority", "status"]]
        
        # Rename columns for better display
        df.columns = ["Title", "Description", "Due Date", "Priority", "Status"]
        
        st.dataframe(df, use_container_width=True)