"""Renders local weather station history for the web UI."""

from __future__ import annotations

import json
from datetime import datetime
from gibil.classes.models import WeatherStationObservation
from astrape_oracle.classes.datasets import WeatherStationDisplayDataset


class WeatherStationDisplay:
    """Renders local weather station history for the Astrape web UI."""

    def render(self) -> str:
        return """
        <section class="panel weather-station-panel" data-module="weather-station-display">
          <div class="panel-heading">
            <div>
              <h2>Weather Station</h2>
              <p>Local Ecowitt history</p>
            </div>
            <div class="control-row">
              <label>
                Range
                <select id="station-range">
                  <option value="24">24 hours</option>
                  <option value="72">3 days</option>
                  <option value="168" selected>7 days</option>
                  <option value="720">30 days</option>
                </select>
              </label>
              <label>
                Variable
                <select id="station-variable">
                  <option value="solar_radiation_w_m2">Sun</option>
                  <option value="rain_rate_mm_h">Rain rate</option>
                  <option value="rain_daily_mm">Daily rain</option>
                  <option value="wind_speed_m_s">Wind speed</option>
                  <option value="wind_gust_m_s">Wind gust</option>
                  <option value="temperature_c">Temperature</option>
                  <option value="relative_humidity_pct">Humidity</option>
                  <option value="relative_pressure_hpa">Pressure</option>
                  <option value="uv_index">UV index</option>
                </select>
              </label>
            </div>
          </div>
          <div id="station-stats" class="stat-grid"></div>
          <div class="chart-shell">
            <canvas id="station-chart" width="1100" height="420"></canvas>
          </div>
        </section>
        <script>
        window.astrapeModules = window.astrapeModules || {};
        window.astrapeModules.weatherStationDisplay = (() => {
          const variables = {
            solar_radiation_w_m2: { label: "Sun", unit: "W/m2", color: "#fbbf24", decimals: 0 },
            rain_rate_mm_h: { label: "Rain rate", unit: "mm/h", color: "#60a5fa", decimals: 1 },
            rain_daily_mm: { label: "Daily rain", unit: "mm", color: "#38bdf8", decimals: 1 },
            wind_speed_m_s: { label: "Wind speed", unit: "m/s", color: "#34d399", decimals: 1 },
            wind_gust_m_s: { label: "Wind gust", unit: "m/s", color: "#22d3ee", decimals: 1 },
            temperature_c: { label: "Temperature", unit: "C", color: "#fb7185", decimals: 1 },
            relative_humidity_pct: { label: "Humidity", unit: "%", color: "#a78bfa", decimals: 0 },
            relative_pressure_hpa: { label: "Pressure", unit: "hPa", color: "#f8fafc", decimals: 1 },
            uv_index: { label: "UV index", unit: "", color: "#f59e0b", decimals: 1 },
          };

          function init() {
            document.getElementById("station-range").addEventListener("change", refresh);
            document.getElementById("station-variable").addEventListener("change", render);
            refresh();
            setInterval(refresh, 30000);
          }

          async function refresh() {
            const hours = document.getElementById("station-range").value;
            const response = await fetch(`/api/weather-station?lookback_hours=${hours}`, { cache: "no-store" });
            window.astrapeWeatherStationData = await response.json();
            render();
          }

          function render() {
            const payload = window.astrapeWeatherStationData || { observations: [], stats: {} };
            renderStats(payload);
            drawChart(payload);
          }

          function renderStats(payload) {
            const stats = payload.stats || {};
            const items = [
              { label: "Sun peak", value: stats.max_solar_radiation_w_m2, unit: "W/m2", decimals: 0 },
              { label: "Rain today", value: stats.latest_rain_daily_mm, unit: "mm", decimals: 1 },
              { label: "Rain rate peak", value: stats.max_rain_rate_mm_h, unit: "mm/h", decimals: 1 },
              { label: "Wind peak", value: stats.max_wind_gust_m_s, unit: "m/s", decimals: 1 },
              { label: "Outdoor temp", value: stats.latest_temperature_c, unit: "C", decimals: 1 },
              { label: "Humidity", value: stats.latest_relative_humidity_pct, unit: "%", decimals: 0 },
            ];
            document.getElementById("station-stats").innerHTML = items.map((item) => `
              <div class="stat-card">
                <div class="stat-label">${item.label}</div>
                <div class="stat-value">${formatValue(item.value, item.decimals)}<span>${item.unit}</span></div>
              </div>
            `).join("");
          }

          function drawChart(payload) {
            const canvas = document.getElementById("station-chart");
            const ctx = canvas.getContext("2d");
            const variable = document.getElementById("station-variable").value;
            const config = variables[variable];
            const points = (payload.observations || [])
              .map((point) => ({ observed_at: point.observed_at, value: point[variable] }))
              .filter((point) => point.value !== null && Number.isFinite(Number(point.value)));

            ctx.clearRect(0, 0, canvas.width, canvas.height);
            if (!points.length) {
              drawEmpty(ctx, canvas);
              return;
            }

            const xs = points.map((point) => new Date(point.observed_at).getTime());
            const ys = points.map((point) => Number(point.value));
            const bounds = {
              minX: Math.min(...xs),
              maxX: Math.max(...xs),
              minY: Math.min(...ys),
              maxY: Math.max(...ys),
            };
            if (bounds.minY === bounds.maxY) {
              bounds.minY -= 1;
              bounds.maxY += 1;
            }

            drawAxes(ctx, canvas, bounds, config);
            drawSeries(ctx, canvas, bounds, points, config.color);
          }

          function drawAxes(ctx, canvas, bounds, config) {
            const margin = chartMargin();
            ctx.strokeStyle = "#94a3b8";
            ctx.lineWidth = 1;
            ctx.beginPath();
            ctx.moveTo(margin.left, margin.top);
            ctx.lineTo(margin.left, canvas.height - margin.bottom);
            ctx.lineTo(canvas.width - margin.right, canvas.height - margin.bottom);
            ctx.stroke();

            ctx.fillStyle = "#94a3b8";
            ctx.font = "12px system-ui";
            ctx.fillText(`${config.label} (${config.unit})`, margin.left, 16);
            ctx.fillText(formatValue(bounds.maxY, config.decimals), 10, margin.top + 4);
            ctx.fillText(formatValue(bounds.minY, config.decimals), 10, canvas.height - margin.bottom);
          }

          function drawSeries(ctx, canvas, bounds, points, color) {
            const margin = chartMargin();
            ctx.strokeStyle = color;
            ctx.lineWidth = 2;
            ctx.beginPath();
            points.forEach((point, index) => {
              const x = scale(new Date(point.observed_at).getTime(), bounds.minX, bounds.maxX, margin.left, canvas.width - margin.right);
              const y = scale(Number(point.value), bounds.minY, bounds.maxY, canvas.height - margin.bottom, margin.top);
              if (index === 0) ctx.moveTo(x, y);
              else ctx.lineTo(x, y);
            });
            ctx.stroke();
          }

          function drawEmpty(ctx, canvas) {
            ctx.fillStyle = "#9aa8ba";
            ctx.font = "14px system-ui";
            ctx.fillText("No station observations in this range yet.", 28, 42);
          }

          function scale(value, inMin, inMax, outMin, outMax) {
            if (inMin === inMax) return (outMin + outMax) / 2;
            return outMin + ((value - inMin) / (inMax - inMin)) * (outMax - outMin);
          }

          function chartMargin() {
            return { top: 28, right: 28, bottom: 34, left: 58 };
          }

          function formatValue(value, decimals) {
            if (value === null || value === undefined || !Number.isFinite(Number(value))) return "--";
            return Number(value).toFixed(decimals);
          }

          return { init };
        })();
        window.astrapeModules.weatherStationDisplay.init();
        </script>
        """

    def data_payload(
        self,
        dataset: WeatherStationDisplayDataset | None = None,
    ) -> str:
        if dataset is None:
            dataset = WeatherStationDisplayDataset(observations=[])

        observations = [
            self._observation(observation) for observation in dataset.observations
        ]

        return json.dumps(
            {
                "now": datetime.now().astimezone().isoformat(),
                "observations": observations,
                "stats": self._stats(observations),
            }
        )

    def _observation(
        self,
        observation: WeatherStationObservation,
    ) -> dict[str, object]:
        return {
            "observed_at": self._iso(observation.observed_at),
            "received_at": self._iso(observation.received_at),
            "source": observation.source,
            "temperature_c": observation.temperature_c,
            "relative_humidity_pct": observation.relative_humidity_pct,
            "dew_point_c": observation.dew_point_c,
            "pressure_hpa": observation.pressure_hpa,
            "wind_speed_m_s": observation.wind_speed_m_s,
            "wind_gust_m_s": observation.wind_gust_m_s,
            "wind_max_m_s": observation.wind_max_m_s,
            "wind_direction_deg": observation.wind_direction_deg,
            "solar_radiation_w_m2": observation.solar_radiation_w_m2,
            "uv_index": observation.uv_index,
            "rain_rate_mm_h": observation.rain_rate_mm_h,
            "rain_event_mm": observation.rain_event_mm,
            "rain_hourly_mm": observation.rain_hourly_mm,
            "rain_daily_mm": observation.rain_daily_mm,
            "rain_weekly_mm": observation.rain_weekly_mm,
            "rain_monthly_mm": observation.rain_monthly_mm,
            "rain_yearly_mm": observation.rain_yearly_mm,
            "indoor_temperature_c": observation.indoor_temperature_c,
            "indoor_humidity_pct": observation.indoor_humidity_pct,
            "absolute_pressure_hpa": observation.absolute_pressure_hpa,
            "relative_pressure_hpa": observation.relative_pressure_hpa,
        }

    def _stats(self, observations: list[dict[str, object]]) -> dict[str, object]:
        latest = observations[-1] if observations else {}
        return {
            "latest_temperature_c": latest.get("temperature_c"),
            "latest_relative_humidity_pct": latest.get("relative_humidity_pct"),
            "latest_rain_daily_mm": latest.get("rain_daily_mm"),
            "max_solar_radiation_w_m2": self._max_value(
                observations, "solar_radiation_w_m2"
            ),
            "max_rain_rate_mm_h": self._max_value(observations, "rain_rate_mm_h"),
            "max_wind_gust_m_s": self._max_value(observations, "wind_gust_m_s"),
        }

    def _max_value(
        self,
        observations: list[dict[str, object]],
        key: str,
    ) -> float | None:
        values = [
            value
            for observation in observations
            if isinstance((value := observation.get(key)), (int, float))
        ]
        if not values:
            return None
        return float(max(values))

    def _iso(self, value: datetime) -> str:
        return value.isoformat()