kanban.py

# Kanban Board App using Streamlit
# Ensure you run this locally with `streamlit run kanban.py`

import os
import json
import streamlit as st
import uuid

st.set_page_config(page_title="Kanban Board", layout="wide")

st.title("🗂️ Simple Kanban Board")

KANBAN_FILE = "kanban_data.json"

def load_kanban():
    if os.path.exists(KANBAN_FILE):
        with open(KANBAN_FILE, "r") as f:
            return json.load(f)
    return {
        "To Do": [],
        "In Progress": [],
        "Done": []
    }

def save_kanban(data):
    with open(KANBAN_FILE, "w") as f:
        json.dump(data, f, indent=2)

# Initialize session state if not already set
if "kanban_data" not in st.session_state:
    st.session_state.kanban_data = load_kanban()

columns = list(st.session_state.kanban_data.keys())

# Form to add new tasks
with st.form("new_task_form"):
    st.subheader("➕ Add New Task")
    new_task = st.text_input("Task name")
    column_choice = st.selectbox("Select column", columns)
    submitted = st.form_submit_button("Add Task")
    if submitted and new_task.strip():
        task_id = str(uuid.uuid4())
        st.session_state.kanban_data[column_choice].append({"id": task_id, "name": new_task.strip()})
        save_kanban(st.session_state.kanban_data)
        st.experimental_rerun()

# Reset board button
if st.button("🗑️ Reset All Tasks"):
    st.session_state.kanban_data = {
        "To Do": [],
        "In Progress": [],
        "Done": []
    }
    save_kanban(st.session_state.kanban_data)
    st.experimental_rerun()

# Display columns
cols = st.columns(len(columns))
for i, col in enumerate(columns):
    with cols[i]:
        st.subheader(col)
        for task in st.session_state.kanban_data[col]:
            with st.container():
                st.markdown(f"- {task['name']}")
                move_to = st.selectbox(f"Move to:", ["-"] + columns, key=task['id'])
                if move_to != "-" and move_to != col:
                    st.session_state.kanban_data[col] = [t for t in st.session_state.kanban_data[col] if t['id'] != task['id']]
                    st.session_state.kanban_data[move_to].append(task)
                    save_kanban(st.session_state.kanban_data)
                    st.experimental_rerun()