first commit

frontend/app/(dashboard)/energy/page.tsx

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+"use client";
+
+import { useEffect, useState, useCallback } from "react";
+import { toast } from "sonner";
+import {
+  fetchEnergyReport, fetchUtilityPower,
+  type EnergyReport, type UtilityPower,
+} from "@/lib/api";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { Skeleton } from "@/components/ui/skeleton";
+import {
+  AreaChart, Area, LineChart, Line,
+  XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, ReferenceLine,
+} from "recharts";
+import { Zap, Leaf, RefreshCw, TrendingDown, DollarSign, Activity } from "lucide-react";
+import { cn } from "@/lib/utils";
+
+const SITE_ID = "sg-01";
+
+// Singapore grid emission factor (kgCO2e/kWh) — Energy Market Authority 2023
+const GRID_EF_KG_CO2_KWH = 0.4168;
+// Approximate WUE for air-cooled DC in Singapore climate
+const WUE_EST = 1.4;
+
+function KpiTile({
+  label, value, sub, icon: Icon, iconClass, warn,
+}: {
+  label: string; value: string; sub?: string;
+  icon?: React.ElementType; iconClass?: string; warn?: boolean;
+}) {
+  return (
+    <div className="rounded-xl border border-border bg-muted/10 px-4 py-4 space-y-1">
+      <div className="flex items-center gap-2">
+        {Icon && <Icon className={cn("w-4 h-4 shrink-0", iconClass ?? "text-primary")} />}
+        <p className="text-[10px] text-muted-foreground uppercase tracking-wider">{label}</p>
+      </div>
+      <p className={cn("text-2xl font-bold tabular-nums leading-none", warn && "text-amber-400")}>{value}</p>
+      {sub && <p className="text-[10px] text-muted-foreground">{sub}</p>}
+    </div>
+  );
+}
+
+function SectionHeader({ children }: { children: React.ReactNode }) {
+  return (
+    <h2 className="text-xs font-semibold uppercase tracking-widest text-muted-foreground">{children}</h2>
+  );
+}
+
+export default function EnergyPage() {
+  const [energy,  setEnergy]  = useState<EnergyReport | null>(null);
+  const [utility, setUtility] = useState<UtilityPower | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  const load = useCallback(async () => {
+    try {
+      const [e, u] = await Promise.all([
+        fetchEnergyReport(SITE_ID, 30),
+        fetchUtilityPower(SITE_ID).catch(() => null),
+      ]);
+      setEnergy(e);
+      setUtility(u);
+    } catch { toast.error("Failed to load energy data"); }
+    finally { setLoading(false); }
+  }, []);
+
+  useEffect(() => {
+    load();
+    const id = setInterval(load, 60_000);
+    return () => clearInterval(id);
+  }, [load]);
+
+  const co2e_kg   = energy ? Math.round(energy.kwh_total * GRID_EF_KG_CO2_KWH) : null;
+  const co2e_t    = co2e_kg ? (co2e_kg / 1000).toFixed(2) : null;
+  const wue_water = energy ? (energy.kwh_total * (WUE_EST - 1)).toFixed(0) : null;
+
+  const itKwChart = (energy?.pue_trend ?? []).map((d) => ({
+    day:  new Date(d.day).toLocaleDateString("en-GB", { month: "short", day: "numeric" }),
+    kw:   d.avg_it_kw,
+    pue:  d.pue_est,
+  }));
+
+  const avgPue30 = energy?.pue_estimated ?? null;
+  const pueWarn  = avgPue30 != null && avgPue30 > 1.5;
+
+  return (
+    <div className="p-6 space-y-6">
+      {/* Header */}
+      <div className="flex items-start justify-between gap-4 flex-wrap">
+        <div>
+          <h1 className="text-xl font-semibold">Energy &amp; Sustainability</h1>
+          <p className="text-sm text-muted-foreground">Singapore DC01 — 30-day energy analysis · refreshes every 60s</p>
+        </div>
+        <div className="flex items-center gap-3">
+          {!loading && (
+            <div className="flex items-center gap-1.5 text-xs px-3 py-1.5 rounded-full bg-green-500/10 text-green-400 font-semibold">
+              <Leaf className="w-3.5 h-3.5" /> {co2e_t ? `${co2e_t} tCO₂e this month` : "—"}
+            </div>
+          )}
+          <button
+            onClick={load}
+            className="flex items-center gap-1.5 text-xs text-muted-foreground hover:text-foreground transition-colors"
+          >
+            <RefreshCw className="w-3.5 h-3.5" /> Refresh
+          </button>
+        </div>
+      </div>
+
+      {/* Site energy banner */}
+      {!loading && utility && (
+        <div className="rounded-xl border border-border bg-muted/10 px-5 py-3 flex items-center gap-8 text-sm flex-wrap">
+          <div>
+            <span className="text-muted-foreground">Current IT load: </span>
+            <strong>{utility.total_kw.toFixed(1)} kW</strong>
+          </div>
+          <div>
+            <span className="text-muted-foreground">Tariff: </span>
+            <strong>SGD {utility.tariff_sgd_kwh.toFixed(3)}/kWh</strong>
+          </div>
+          <div>
+            <span className="text-muted-foreground">Month-to-date: </span>
+            <strong>{utility.kwh_month_to_date.toFixed(0)} kWh</strong>
+            <span className="text-muted-foreground ml-1">
+              (SGD {utility.cost_sgd_mtd.toFixed(0)})
+            </span>
+          </div>
+          <div className="ml-auto text-xs text-muted-foreground">
+            Singapore · SP Group grid
+          </div>
+        </div>
+      )}
+
+      {/* 30-day KPIs */}
+      <SectionHeader>30-Day Energy Summary</SectionHeader>
+      {loading ? (
+        <div className="grid grid-cols-2 lg:grid-cols-4 gap-3">
+          {Array.from({ length: 4 }).map((_, i) => <Skeleton key={i} className="h-24" />)}
+        </div>
+      ) : (
+        <div className="grid grid-cols-2 lg:grid-cols-4 gap-3">
+          <KpiTile
+            label="Total Consumption"
+            value={energy ? `${energy.kwh_total.toFixed(0)} kWh` : "—"}
+            sub="last 30 days"
+            icon={Zap}
+            iconClass="text-amber-400"
+          />
+          <KpiTile
+            label="Energy Cost"
+            value={energy ? `SGD ${energy.cost_sgd.toFixed(0)}` : "—"}
+            sub={`@ SGD ${energy?.tariff_sgd_kwh.toFixed(3) ?? "—"}/kWh`}
+            icon={DollarSign}
+            iconClass="text-green-400"
+          />
+          <KpiTile
+            label="Avg PUE"
+            value={avgPue30 != null ? avgPue30.toFixed(3) : "—"}
+            sub={avgPue30 != null && avgPue30 < 1.4 ? "Excellent" : avgPue30 != null && avgPue30 < 1.6 ? "Good" : "Room to improve"}
+            icon={Activity}
+            iconClass={pueWarn ? "text-amber-400" : "text-primary"}
+            warn={pueWarn}
+          />
+          <KpiTile
+            label="Annual Estimate"
+            value={utility ? `SGD ${(utility.cost_sgd_annual_est).toFixed(0)}` : "—"}
+            sub={utility ? `${utility.kwh_annual_est.toFixed(0)} kWh/yr` : undefined}
+            icon={TrendingDown}
+            iconClass="text-muted-foreground"
+          />
+        </div>
+      )}
+
+      {/* IT Load trend */}
+      {(loading || itKwChart.length > 0) && (
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-semibold flex items-center gap-2">
+              <Zap className="w-4 h-4 text-amber-400" />
+              Daily IT Load — 30 Days
+            </CardTitle>
+          </CardHeader>
+          <CardContent>
+            {loading ? (
+              <Skeleton className="h-48" />
+            ) : (
+              <ResponsiveContainer width="100%" height={200}>
+                <AreaChart data={itKwChart} margin={{ top: 4, right: 16, left: -10, bottom: 0 }}>
+                  <defs>
+                    <linearGradient id="itKwGrad" x1="0" y1="0" x2="0" y2="1">
+                      <stop offset="5%"  stopColor="oklch(0.78 0.17 84)" stopOpacity={0.3} />
+                      <stop offset="95%" stopColor="oklch(0.78 0.17 84)" stopOpacity={0} />
+                    </linearGradient>
+                  </defs>
+                  <CartesianGrid strokeDasharray="3 3" stroke="oklch(1 0 0 / 8%)" vertical={false} />
+                  <XAxis
+                    dataKey="day"
+                    tick={{ fontSize: 9, fill: "oklch(0.65 0.04 257)" }}
+                    tickLine={false} axisLine={false}
+                    interval={4}
+                  />
+                  <YAxis
+                    tick={{ fontSize: 9, fill: "oklch(0.65 0.04 257)" }}
+                    tickLine={false} axisLine={false}
+                    tickFormatter={(v) => `${v} kW`}
+                    domain={["auto", "auto"]}
+                  />
+                  <Tooltip
+                    contentStyle={{ backgroundColor: "oklch(0.16 0.04 265)", border: "1px solid oklch(1 0 0/9%)", borderRadius: "6px", fontSize: "12px" }}
+                    formatter={(v) => [`${Number(v).toFixed(1)} kW`, "IT Load"]}
+                  />
+                  <Area type="monotone" dataKey="kw" stroke="oklch(0.78 0.17 84)" fill="url(#itKwGrad)" strokeWidth={2} dot={false} />
+                </AreaChart>
+              </ResponsiveContainer>
+            )}
+          </CardContent>
+        </Card>
+      )}
+
+      {/* PUE trend */}
+      {(loading || itKwChart.length > 0) && (
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-semibold flex items-center gap-2">
+              <Activity className="w-4 h-4 text-primary" />
+              PUE Trend — 30 Days
+              <span className="text-[10px] font-normal text-muted-foreground ml-1">(target: &lt; 1.4)</span>
+            </CardTitle>
+          </CardHeader>
+          <CardContent>
+            {loading ? (
+              <Skeleton className="h-48" />
+            ) : (
+              <ResponsiveContainer width="100%" height={200}>
+                <LineChart data={itKwChart} margin={{ top: 4, right: 16, left: -10, bottom: 0 }}>
+                  <CartesianGrid strokeDasharray="3 3" stroke="oklch(1 0 0 / 8%)" vertical={false} />
+                  <XAxis
+                    dataKey="day"
+                    tick={{ fontSize: 9, fill: "oklch(0.65 0.04 257)" }}
+                    tickLine={false} axisLine={false}
+                    interval={4}
+                  />
+                  <YAxis
+                    tick={{ fontSize: 9, fill: "oklch(0.65 0.04 257)" }}
+                    tickLine={false} axisLine={false}
+                    domain={[1.0, "auto"]}
+                  />
+                  <Tooltip
+                    contentStyle={{ backgroundColor: "oklch(0.16 0.04 265)", border: "1px solid oklch(1 0 0/9%)", borderRadius: "6px", fontSize: "12px" }}
+                    formatter={(v) => [Number(v).toFixed(3), "PUE"]}
+                  />
+                  <ReferenceLine y={1.4} stroke="oklch(0.68 0.14 162)" strokeDasharray="4 4" strokeWidth={1}
+                    label={{ value: "Target 1.4", fontSize: 9, fill: "oklch(0.68 0.14 162)", position: "insideTopRight" }} />
+                  <ReferenceLine y={1.6} stroke="oklch(0.65 0.20 45)" strokeDasharray="4 4" strokeWidth={1}
+                    label={{ value: "Warn 1.6", fontSize: 9, fill: "oklch(0.65 0.20 45)", position: "insideTopRight" }} />
+                  <Line type="monotone" dataKey="pue" stroke="oklch(0.62 0.17 212)" strokeWidth={2} dot={false} activeDot={{ r: 3 }} />
+                </LineChart>
+              </ResponsiveContainer>
+            )}
+          </CardContent>
+        </Card>
+      )}
+
+      {/* Sustainability */}
+      <SectionHeader>Sustainability Metrics</SectionHeader>
+      {loading ? (
+        <div className="grid grid-cols-1 sm:grid-cols-3 gap-3">
+          {Array.from({ length: 3 }).map((_, i) => <Skeleton key={i} className="h-24" />)}
+        </div>
+      ) : (
+        <div className="grid grid-cols-1 sm:grid-cols-3 gap-3">
+          <div className="rounded-xl border border-green-500/20 bg-green-500/5 px-4 py-4 space-y-2">
+            <div className="flex items-center gap-2">
+              <Leaf className="w-4 h-4 text-green-400" />
+              <p className="text-xs font-semibold text-green-400 uppercase tracking-wider">Carbon Footprint</p>
+            </div>
+            <p className="text-2xl font-bold tabular-nums">{co2e_t ?? "—"} tCO₂e</p>
+            <p className="text-[10px] text-muted-foreground">
+              30-day estimate · {energy?.kwh_total.toFixed(0) ?? "—"} kWh × {GRID_EF_KG_CO2_KWH} kgCO₂e/kWh
+            </p>
+            <p className="text-[10px] text-muted-foreground">
+              Singapore grid emission factor (EMA 2023)
+            </p>
+          </div>
+
+          <div className="rounded-xl border border-blue-500/20 bg-blue-500/5 px-4 py-4 space-y-2">
+            <div className="flex items-center gap-2">
+              <Activity className="w-4 h-4 text-blue-400" />
+              <p className="text-xs font-semibold text-blue-400 uppercase tracking-wider">Water Usage (WUE)</p>
+            </div>
+            <p className="text-2xl font-bold tabular-nums">{WUE_EST.toFixed(1)}</p>
+            <p className="text-[10px] text-muted-foreground">
+              Estimated WUE (L/kWh) · air-cooled DC
+            </p>
+            <p className="text-[10px] text-muted-foreground">
+              Est. {wue_water ? `${Number(wue_water).toLocaleString()} L` : "—"} consumed (30d)
+            </p>
+          </div>
+
+          <div className="rounded-xl border border-primary/20 bg-primary/5 px-4 py-4 space-y-2">
+            <div className="flex items-center gap-2">
+              <TrendingDown className="w-4 h-4 text-primary" />
+              <p className="text-xs font-semibold text-primary uppercase tracking-wider">Efficiency</p>
+            </div>
+            <p className={cn("text-2xl font-bold tabular-nums", pueWarn ? "text-amber-400" : "text-green-400")}>
+              {avgPue30?.toFixed(3) ?? "—"}
+            </p>
+            <p className="text-[10px] text-muted-foreground">
+              Avg PUE · {avgPue30 != null && avgPue30 < 1.4 ? "Excellent — Tier IV class" :
+                avgPue30 != null && avgPue30 < 1.6 ? "Good — industry average" :
+                "Above average — optimise cooling"}
+            </p>
+            <p className="text-[10px] text-muted-foreground">
+              IT energy efficiency: {avgPue30 != null ? `${(1 / avgPue30 * 100).toFixed(1)}%` : "—"} of total power to IT
+            </p>
+          </div>
+        </div>
+      )}
+
+      {/* Reference info */}
+      <div className="rounded-xl border border-border bg-muted/5 px-5 py-4 text-xs text-muted-foreground space-y-1.5">
+        <p className="font-semibold text-foreground/80">Singapore Energy Context</p>
+        <p>Grid emission factor: {GRID_EF_KG_CO2_KWH} kgCO₂e/kWh (EMA 2023, predominantly natural gas + growing solar)</p>
+        <p>Electricity tariff: SGD {utility?.tariff_sgd_kwh.toFixed(3) ?? "0.298"}/kWh (SP Group commercial rate)</p>
+        <p>BCA Green Mark: Targeting GoldPLUS certification · PUE target &lt; 1.4</p>
+        <p className="text-muted-foreground/50 text-[10px] pt-1">
+          CO₂e and WUE estimates are indicative. Actual values depend on metered chilled water and cooling tower data.
+        </p>
+      </div>
+    </div>
+  );
+}