From a65d13468248eb6b219840d1e2dab5266fcab1b6 Mon Sep 17 00:00:00 2001
From: Dusan Vojacek <dusan.vojacek@direct.cz>
Date: Fri, 10 Apr 2026 22:49:43 +0200
Subject: [PATCH] flwo - denni sankey graf

---
 docs/04-modules/energy-flows.md    |  2 +-
 frontend/src/pages/EnergyFlows.tsx | 59 ++++++++++++++++++++++++++++--
 2 files changed, 56 insertions(+), 5 deletions(-)

diff --git a/docs/04-modules/energy-flows.md b/docs/04-modules/energy-flows.md
index 3baffb7..9036551 100644
--- a/docs/04-modules/energy-flows.md
+++ b/docs/04-modules/energy-flows.md
@@ -28,7 +28,7 @@ Základní 6 Wh veličin (import/export, PV, baterie, load) zůstává ve Fázi
 
 ## UI
 
-- Sankey (`@nivo/sankey`) – součet toků za zvolený měsíc. Síť je ve vizualizaci rozdělena na **Import ze sítě** a **Export do sítě** (jinak by vznikl cyklus síť↔baterie a knihovna hlásí „circular link“).
+- Sankey (`@nivo/sankey`) – součet toků za **celý měsíc** nebo za **jeden vybraný den** (rozbalovací pole „Graf a karty“; klik na název dne v tabulce také přepne den). Síť je ve vizualizaci rozdělena na **Import ze sítě** a **Export do sítě** (jinak by vznikl cyklus síť↔baterie a knihovna hlásí „circular link“).
 - Tři perspektivní karty (FVE / síť / baterie).
 - Tabulka dnů s rozbalením na 15min intervaly.
 
diff --git a/frontend/src/pages/EnergyFlows.tsx b/frontend/src/pages/EnergyFlows.tsx
index 6de83d8..4f102fd 100644
--- a/frontend/src/pages/EnergyFlows.tsx
+++ b/frontend/src/pages/EnergyFlows.tsx
@@ -1,5 +1,5 @@
 import { ChevronDown, ChevronLeft, ChevronRight, ChevronUp } from 'lucide-react'
-import { Fragment, useMemo, useState } from 'react'
+import { Fragment, useEffect, useMemo, useState } from 'react'
 
 import { EnergyFlowSankey, type FlowTotals } from '../components/EnergyFlowSankey'
 import { useEnergyFlowsDaily, useEnergyFlowsIntervals } from '../hooks/useEnergyFlows'
@@ -132,10 +132,23 @@ export default function EnergyFlows() {
 
   const [month, setMonth] = useState(currentMonth)
   const [expandedDay, setExpandedDay] = useState<string | null>(null)
+  /** null = součet za celý měsíc; jinak ISO den pro Sankey + perspektivní karty */
+  const [scopeDay, setScopeDay] = useState<string | null>(null)
 
   const { days, loading, error, reload } = useEnergyFlowsDaily(siteId, month)
 
-  const totals = useMemo(() => (days.length > 0 ? aggregateFlows(days) : null), [days])
+  useEffect(() => {
+    setScopeDay(null)
+  }, [month])
+
+  const totals = useMemo(() => {
+    if (days.length === 0) return null
+    if (scopeDay) {
+      const row = days.find((d) => d.day === scopeDay)
+      if (row) return aggregateFlows([row])
+    }
+    return aggregateFlows(days)
+  }, [days, scopeDay])
 
   const flowOnly: FlowTotals | null = totals
     ? {
@@ -201,6 +214,30 @@ export default function EnergyFlows() {
         </div>
       ) : (
         <>
+          {days.length > 0 && (
+            <div className="flex flex-wrap items-center gap-3 rounded-lg border border-slate-800 bg-slate-900/60 px-3 py-2">
+              <label htmlFor="energy-flow-scope" className="text-sm text-slate-400">
+                Graf a karty:
+              </label>
+              <select
+                id="energy-flow-scope"
+                className="max-w-[min(100%,20rem)] rounded-lg border border-slate-700 bg-slate-900 px-3 py-1.5 text-sm text-slate-200"
+                value={scopeDay ?? ''}
+                onChange={(e) => {
+                  const v = e.target.value
+                  setScopeDay(v === '' ? null : v)
+                }}
+              >
+                <option value="">Celý měsíc (součet)</option>
+                {days.map((d) => (
+                  <option key={d.day} value={d.day}>
+                    {fmtDay(d.day)}
+                  </option>
+                ))}
+              </select>
+            </div>
+          )}
+
           {totals && (
             <div className="grid gap-3 sm:grid-cols-3">
               <div className="rounded-xl border border-slate-800 bg-slate-900 p-4">
@@ -243,7 +280,9 @@ export default function EnergyFlows() {
           )}
 
           <div className="rounded-xl border border-slate-800 bg-slate-900 p-4">
-            <h2 className="mb-2 text-sm font-medium text-slate-300">Sankey — součet za měsíc</h2>
+            <h2 className="mb-2 text-sm font-medium text-slate-300">
+              Sankey — {scopeDay ? fmtDay(scopeDay) : 'celý měsíc (součet)'}
+            </h2>
             <EnergyFlowSankey totals={flowOnly} />
           </div>
 
@@ -281,7 +320,19 @@ export default function EnergyFlows() {
                             <span className="mr-1 inline-block w-4">
                               {expandedDay === row.day ? <ChevronUp size={14} /> : <ChevronDown size={14} />}
                             </span>
-                            {fmtDay(row.day)}
+                            <button
+                              type="button"
+                              className={`rounded px-1 text-left underline-offset-2 hover:underline ${
+                                scopeDay === row.day ? 'text-amber-300' : ''
+                              }`}
+                              title="Zobrazit tento den v Sankey a v kartách"
+                              onClick={(e) => {
+                                e.stopPropagation()
+                                setScopeDay(row.day)
+                              }}
+                            >
+                              {fmtDay(row.day)}
+                            </button>
                           </td>
                           <td className="px-3 py-2 text-right text-sm">{row.pv_production_kwh.toFixed(1)}</td>
                           <td className="px-3 py-2 text-right text-sm">{row.grid_import_kwh.toFixed(2)}</td>