from datetime import date

import streamlit as st

from data_processing import filter_by_date, hourly_average, load_data

st.set_page_config(page_title="Glucose dashboard", page_icon="📊", layout="centered")

st.title("Glucose per uur")

df = load_data()

min_date = df["timestamp"].dt.date.min() if not df.empty else date.today()
max_date = df["timestamp"].dt.date.max() if not df.empty else date.today()

selected_date = st.date_input(
    "Kies een datum",
    value=max_date,
    min_value=min_date,
    max_value=max_date,
)

day_data = filter_by_date(df, selected_date)

if day_data.empty:
    st.info("Geen metingen gevonden voor deze datum.")
else:
    hourly = hourly_average(day_data)
    st.bar_chart(
        hourly.set_index("hour")["glucose_value"],
        x_label="Uur van de dag",
        y_label="Gemiddelde glucosewaarde",
    )
    st.caption(f"{len(day_data)} metingen op {selected_date.strftime('%d-%m-%Y')}")