Code Editor for app.py

import streamlit as st

# -------------------------------
# Validation function
# -------------------------------
def validate_fields(step):
    """Return a list of empty fields based on the step number."""
    empty_fields = []

    if step == 0:
        if not st.session_state["name"].strip():
            empty_fields.append("Nazwa")
        if not st.session_state["description"].strip():
            empty_fields.append("Opis")
        if st.session_state["unit"] == "":
            empty_fields.append("Jednostka")
        if st.session_state["config"] == "":
            empty_fields.append("Konfiguracja")

    elif step == 1:
        if not st.session_state["module"].strip():
            empty_fields.append("Moduł")
        if not st.session_state["nrb"].strip():
            empty_fields.append("NRB klienta")

    return empty_fields


# -------------------------------
# Step rendering functions
# -------------------------------
def render_step_1():
    with st.expander("Krok 1 – Podstawowe informacje", expanded=True):
        st.text_input("Nazwa:", key="name")
        st.text_area("Opis:", key="description")

        col1, col2 = st.columns(2)
        with col1:
            st.selectbox("Jednostka:", options=["", "Centrala"], key="unit")
        with col2:
            st.selectbox("Konfiguracja wyciągów", options=["", "Konfiguracja 1"], key="config")


def render_step_2():
    with st.expander("Krok 2 – Dodatkowe dane", expanded=True):
        st.text_input("Moduł:", key="module")
        st.text_input("NRB klienta:", key="nrb")


# -------------------------------
# Main App
# -------------------------------
st.title("Kreator zakładania grupy wyciągów")

steps = [
    "Krok 1 - Wpisz unikalną nazwę grupy, opis oraz wybierz formę wysyłki do klienta",
    "Krok 2 - Dodaj modula lub NRB klienta"
]

# Initialize session state
if 'current_step' not in st.session_state:
    st.session_state.current_step = 0

# Display step markers with highlighting for the current step
for i, step in enumerate(steps):
    if i == st.session_state.current_step:
        st.markdown(f"* **{step}**")
    else:
        st.markdown(f"* {step}", help="Not active")

# Render the appropriate step content
if st.session_state.current_step == 0:
    render_step_1()
elif st.session_state.current_step == 1:
    render_step_2()

# Navigation buttons
col1, col2, col3 = st.columns(3)

with col1:
    if st.button("Poprzedni Krok", disabled=st.session_state.current_step == 0):
        st.session_state.current_step -= 1
        st.rerun() # Rerun to refresh after changing step

with col2:
    if st.button("Następny Krok", disabled=st.session_state.current_step == len(steps) - 1):
        # Validate fields for the current step
        empty_fields = validate_fields(st.session_state.current_step)

        if empty_fields:
            st.warning(f"Nieuzupełnione pola: {', '.join(empty_fields)}")
        else:
            st.session_state.current_step += 1
            st.rerun()  # Rerun to refresh after changing step

with col3:
    st.button("Anuluj", type="primary")