first commit

app.py

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+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')}")