"""Market bar — displays major indices at the top of the app."""
import streamlit as st
from services.data_service import get_market_indices
from utils.formatters import fmt_number


def render_market_bar():
    indices = get_market_indices()

    cols = st.columns(len(indices))
    for col, (name, data) in zip(cols, indices.items()):
        price = data.get("price")
        change_pct = data.get("change_pct")

        if price is None:
            col.metric(label=name, value="—")
            continue

        price_str = f"{price:,.2f}"
        delta_str = f"{change_pct * 100:+.2f}%" if change_pct is not None else None
        col.metric(
            label=name,
            value=price_str,
            delta=delta_str,
        )