import plotly.graph_objects as go
import requests
import streamlit as st
from plotly.subplots import make_subplots

from auth import require_auth
from data_processing import TARGET_HIGH, TARGET_LOW
from nightscout_client import NightscoutConfigError
from ui_common import (
    add_threshold_lines,
    get_colors,
    load_range_data,
    render_completeness_warning,
    select_period_days,
)

st.set_page_config(page_title="Glucose dashboard — Dagoverzicht", page_icon="📊", layout="wide")
require_auth()

st.title("Dagoverzicht")
st.caption("Eén glucosegrafiek per kalenderdag (FR4).")

start, end, days = select_period_days(default_label="14 dagen")
if days > 31:
    st.info(
        "Bij langere periodes wordt de pagina lang en kan laden traag zijn — "
        "voor het bekijken van individuele dagen is 14 of 30 dagen prettiger."
    )

try:
    glucose, _treatments = load_range_data(start, end)
except NightscoutConfigError as exc:
    st.error(str(exc))
    st.stop()
except (requests.RequestException, ValueError) as exc:
    st.error(f"Kon geen data ophalen van Nightscout: {exc}")
    st.stop()

if glucose.empty:
    st.info("Geen glucosemetingen gevonden in deze periode.")
    st.stop()

render_completeness_warning(glucose, start, end)

colors = get_colors()
glucose = glucose.copy()
glucose["date"] = glucose["timestamp"].dt.date
glucose["hour"] = glucose["timestamp"].dt.hour + glucose["timestamp"].dt.minute / 60

dates = sorted(glucose["date"].unique())
row_height = 150
fig = make_subplots(
    rows=len(dates),
    cols=1,
    shared_xaxes=True,
    subplot_titles=[d.strftime("%A %d-%m-%Y") for d in dates],
    vertical_spacing=min(0.4 / max(len(dates) - 1, 1), 0.05),
)

for i, day in enumerate(dates, start=1):
    day_df = glucose[glucose["date"] == day]
    fig.add_hrect(
        y0=TARGET_LOW, y1=TARGET_HIGH, fillcolor=colors["band"], line_width=0, layer="below", row=i, col=1
    )
    fig.add_trace(
        go.Scatter(
            x=day_df["hour"],
            y=day_df["mmol"],
            mode="lines",
            line={"color": colors["glucose"], "width": 2},
            showlegend=False,
            hovertemplate="%{y:.1f} mmol/L<extra></extra>",
        ),
        row=i,
        col=1,
    )
    fig.update_yaxes(title_text="mmol/L", gridcolor=colors["grid"], row=i, col=1)
    add_threshold_lines(fig, colors, row=i)

fig.update_xaxes(title_text="Uur van de dag", range=[0, 24], dtick=4, gridcolor=colors["grid"])
fig.update_layout(
    paper_bgcolor="rgba(0,0,0,0)",
    plot_bgcolor="rgba(0,0,0,0)",
    font_color=colors["text"],
    height=row_height * len(dates),
    showlegend=False,
    margin={"l": 10, "r": 10, "t": 30, "b": 10},
)
st.plotly_chart(fig, width="stretch")
st.caption(f"{len(dates)} dagen · {len(glucose)} metingen")