From d1f0b876aabddb87c8d8645f4f974850b6bbc332 Mon Sep 17 00:00:00 2001
From: "belevo\\mh" <mh@belevo.ch>
Date: Thu, 18 Dec 2025 08:32:15 +0100
Subject: [PATCH] no message

---
 Energy_Pie/module.html | 196 +++++++++++++++++++++++------------------
 Energy_Pie/module.php  | 179 +++++++++++++++++++++----------------
 2 files changed, 213 insertions(+), 162 deletions(-)

diff --git a/Energy_Pie/module.html b/Energy_Pie/module.html
index 57e7871..ccc22ce 100644
--- a/Energy_Pie/module.html
+++ b/Energy_Pie/module.html
@@ -1,6 +1,5 @@
 
-<div id="wrap"
-     style="padding:12px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;">
+<div id="wrap" style="padding:12px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;">
   <!-- Controls -->
   <div style="display:flex;gap:10px;flex-wrap:wrap;align-items:center;">
     <label style="display:flex;gap:6px;align-items:center;">
@@ -23,8 +22,12 @@
   <div id="period" style="margin-top:10px;font-size:12px;opacity:0.75;"></div>
   <div id="hint"   style="margin-top:6px;font-size:12px;opacity:0.8;"></div>
   <div id="grid"
-       style="margin-top:14px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));
-              gap:14px;max-width:880px;">
+       style="margin-top:14px;
+              display:grid;
+              grid-template-columns:repeat(2,minmax(0,1fr));
+              gap:14px;
+              width:100%;
+              max-width:none;">
   </div>
   <!-- Debug/Status -->
   <div id="dbg" style="margin-top:10px;font-size:12px;opacity:0.75;"></div>
@@ -32,37 +35,67 @@
   <div id="err" style="margin-top:6px;font-size:12px;opacity:0.9;color:#ffb4b4;"></div>
 </div>
 <style>
-  #wrap {
-    position: relative;
-    overflow: hidden;
+  /* Responsive: bei schmalen Screens 1 Spalte */
+  @media (max-width: 720px) {
+    #grid { grid-template-columns: 1fr !important; }
   }
-  #wrap::before {
-    content: "";
-    position: absolute;
-    inset: -40%;
+  /* Quantum-Waves Hintergrund */
+  #wrap{
+    position:relative;
+    overflow:hidden;
+    min-height:100vh;
+  }
+  #wrap::before{
+    content:"";
+    position:absolute;
+    inset:-50%;
     background:
-      radial-gradient(circle at 20% 20%, rgba(99,179,255,0.18), transparent 45%),
-      radial-gradient(circle at 80% 30%, rgba(168,85,247,0.16), transparent 50%),
-      radial-gradient(circle at 50% 80%, rgba(255,255,255,0.06), transparent 55%);
-    filter: blur(18px);
-    animation: auroraMove 10s ease-in-out infinite alternate;
-    pointer-events: none;
-    z-index: 0;
+      radial-gradient(circle at 20% 25%, rgba(99,179,255,.20), transparent 45%),
+      radial-gradient(circle at 80% 35%, rgba(168,85,247,.18), transparent 50%),
+      radial-gradient(circle at 55% 80%, rgba(255,255,255,.07), transparent 55%);
+    filter: blur(20px);
+    opacity:.9;
+    animation: qDrift 14s ease-in-out infinite alternate;
+    pointer-events:none;
+    z-index:0;
   }
-  #wrap > * {
-    position: relative;
-    z-index: 1;
+  #wrap::after{
+    content:"";
+    position:absolute;
+    inset:-30%;
+    background:
+      repeating-radial-gradient(circle at 30% 40%,
+        rgba(255,255,255,.06) 0px,
+        rgba(255,255,255,0) 14px,
+        rgba(255,255,255,0) 28px),
+      repeating-linear-gradient(120deg,
+        rgba(168,85,247,.06) 0px,
+        rgba(168,85,247,0) 18px,
+        rgba(99,179,255,.05) 36px,
+        rgba(99,179,255,0) 54px);
+    mix-blend-mode: overlay;
+    opacity:.35;
+    animation: qWaves 10s linear infinite;
+    pointer-events:none;
+    z-index:0;
   }
-  @keyframes auroraMove {
-    from { transform: translate3d(-2%, -2%, 0) scale(1.02); }
-    to   { transform: translate3d( 2%,  2%, 0) scale(1.06); }
+  #wrap > *{
+    position:relative;
+    z-index:1;
+  }
+  @keyframes qDrift{
+    from{ transform: translate3d(-2%, -2%, 0) scale(1.02) rotate(-2deg); }
+    to  { transform: translate3d( 2%,  2%, 0) scale(1.08) rotate( 2deg); }
+  }
+  @keyframes qWaves{
+    from{ transform: translate3d(0,0,0) rotate(0deg); }
+    to  { transform: translate3d(6%, -4%, 0) rotate(360deg); }
   }
 </style>
 <!-- 1) Puffer-Handler: fängt Symcon-Messages ab, selbst wenn UI noch nicht ready ist -->
 <script>
   window.__EnergyPieQueue = window.__EnergyPieQueue || [];
   window.__EnergyPieReady = false;
-  // Symcon ruft handleMessage evtl. sehr früh auf -> wir puffern.
   window.handleMessage = function (data) {
     window.__EnergyPieQueue.push(data);
     if (window.__EnergyPieReady && typeof window.__EnergyPieConsume === "function") {
@@ -83,7 +116,7 @@
   const elGrid   = document.getElementById('grid');
   const elDbg    = document.getElementById('dbg');
   const elErr    = document.getElementById('err');
-  // Start nicht "grau/leer"
+  // Start nicht "leer"
   elGrid.innerHTML = '<div style="opacity:.75;padding:12px;">Lade Daten…</div>';
   // --- helpers ---
   function toNum(x) {
@@ -116,10 +149,9 @@
     const msg = (e && e.message) ? e.message : String(e);
     elErr.textContent = 'JS-Fehler: ' + msg;
   }
-  // Global error trap
   window.addEventListener('error', (ev) => showErr(ev.error || ev.message));
   window.addEventListener('unhandledrejection', (ev) => showErr(ev.reason));
-  // --- requestAction robust finden (Popup hat das oft am parent) ---
+  // --- requestAction robust finden ---
   function getRequestAction() {
     if (typeof window.requestAction === 'function') return window.requestAction;
     if (typeof window.parent?.requestAction === 'function') return window.parent.requestAction;
@@ -135,70 +167,64 @@
       return false;
     };
     if (tryCall()) return;
-    // Popup/Fullscreen: manchmal kommt requestAction deutlich später -> länger retry
     let tries = 0;
     const timer = setInterval(() => {
       tries++;
-      if (tryCall() || tries >= 150) clearInterval(timer); // ~18s
+      if (tryCall() || tries >= 150) clearInterval(timer);
     }, 120);
   }
   function safeRefreshSoon() {
     setTimeout(() => safeRequestAction('Refresh', 1), 150);
   }
   // --- donut card ---
-function donutCard({ title, percent, subtitle, color }) {
-  const share = clamp01(percent / 100);
-  const r = 56;
-  const c = 2 * Math.PI * r;
-  const dash = share * c;
-  const gap  = c - dash;
-  return `
-    <div style="border:1px solid rgba(255,255,255,0.12);
-                border-radius:16px;
-                padding:14px;
-                min-height:210px;
-                display:flex;
-                flex-direction:column;
-                align-items:center;
-                justify-content:center;
-                gap:10px;">
-      <!-- Titel oben -->
-      <div style="font-size:14px;font-weight:700;opacity:.9;">
-        ${escapeHtml(title)}
-      </div>
-      <!-- Donut -->
-      <div style="position:relative;width:170px;height:170px;">
-        <svg width="170" height="170" viewBox="0 0 170 170">
-          <circle cx="85" cy="85" r="${r}"
-                  fill="none"
-                  stroke="rgba(255,255,255,0.10)"
-                  stroke-width="18" />
-          <circle cx="85" cy="85" r="${r}"
-                  fill="none"
-                  stroke="${color}"
-                  stroke-width="18"
-                  stroke-linecap="butt"
-                  stroke-dasharray="${dash} ${gap}"
-                  transform="rotate(-90 85 85)" />
-        </svg>
-        <!-- Prozent im Kreis -->
-        <div style="position:absolute;
-                    inset:0;
-                    display:flex;
-                    align-items:center;
-                    justify-content:center;
-                    font-weight:800;
-                    font-size:22px;">
-          ${escapeHtml(percent.toFixed(1))}%
+  function donutCard({ title, percent, subtitle, color }) {
+    const share = clamp01(percent / 100);
+    const r = 56;
+    const c = 2 * Math.PI * r;
+    const dash = share * c;
+    const gap  = c - dash;
+    return `
+      <div style="border:1px solid rgba(255,255,255,0.12);
+                  border-radius:16px;
+                  padding:14px;
+                  min-height:260px;
+                  width:100%;
+                  display:flex;
+                  flex-direction:column;
+                  align-items:center;
+                  justify-content:center;
+                  gap:12px;
+                  background:rgba(0,0,0,0.08);
+                  backdrop-filter: blur(2px);">
+        <div style="font-size:14px;font-weight:700;opacity:.9;">
+          ${escapeHtml(title)}
+        </div>
+        <div style="position:relative;width:180px;height:180px;">
+          <svg width="180" height="180" viewBox="0 0 180 180">
+            <circle cx="90" cy="90" r="${r}"
+                    fill="none"
+                    stroke="rgba(255,255,255,0.10)"
+                    stroke-width="18" />
+            <circle cx="90" cy="90" r="${r}"
+                    fill="none"
+                    stroke="${color}"
+                    stroke-width="18"
+                    stroke-linecap="butt"
+                    stroke-dasharray="${dash} ${gap}"
+                    transform="rotate(-90 90 90)" />
+          </svg>
+          <div style="position:absolute;inset:0;display:flex;
+                      align-items:center;justify-content:center;
+                      font-weight:800;font-size:24px;">
+            ${escapeHtml(percent.toFixed(1))}%
+          </div>
+        </div>
+        <div style="font-size:12px;opacity:.65;text-align:center;">
+          ${escapeHtml(subtitle)}
         </div>
       </div>
-      <!-- Untertitel unten -->
-      <div style="font-size:12px;opacity:.65;text-align:center;">
-        ${escapeHtml(subtitle)}
-      </div>
-    </div>
-  `;
-}
+    `;
+  }
   function render(data) {
     const values = data?.values || {};
     const prod = toNum(values?.Produktion);
@@ -208,12 +234,10 @@ function donutCard({ title, percent, subtitle, color }) {
     const eigenClamped = eigen < 0 ? 0 : eigen;
     const evq    = (prod > 0) ? (eigenClamped / prod * 100) : 0;
     const autark = (cons > 0) ? (eigenClamped / cons * 100) : 0;
-    // Controls sync
     if (data?.range) elRange.value = data.range;
     if (data?.date)  elDate.value  = data.date;
     const isTotal = (data?.range === 'total');
     elDate.disabled = isTotal;
-    // Zeitraum-Text
     if (data?.tStart && data?.tEnd) {
       const s = new Date(data.tStart * 1000);
       const e = new Date(data.tEnd   * 1000);
@@ -223,7 +247,6 @@ function donutCard({ title, percent, subtitle, color }) {
     } else {
       elPeriod.textContent = '';
     }
-    // Hint
     if (data?.hasData === false) {
       elHint.textContent = 'Keine Logdaten für den gewählten Zeitraum.';
     } else {
@@ -244,6 +267,7 @@ function donutCard({ title, percent, subtitle, color }) {
         color: '#A855F7'
       })
     ].join('');
+
   }
   // --- cache ---
   function saveLast(data) {
@@ -257,7 +281,6 @@ function donutCard({ title, percent, subtitle, color }) {
       return null;
     }
   }
-  // 2) Consumer für gepufferte Symcon-Messages
   window.__EnergyPieConsume = function (data) {
     if (typeof data === 'string') {
       try { data = JSON.parse(data); } catch(e) {}
@@ -278,16 +301,13 @@ function donutCard({ title, percent, subtitle, color }) {
   elPrev.addEventListener('click',  () => safeRequestAction('Prev', 1));
   elToday.addEventListener('click', () => safeRequestAction('Today', 1));
   elNext.addEventListener('click',  () => safeRequestAction('Next', 1));
-  // On load: cached sofort rendern
   const cached = loadLast();
   if (cached) render(cached);
-  // UI ready -> Queue flushen
   window.__EnergyPieReady = true;
   if (window.__EnergyPieQueue && window.__EnergyPieQueue.length) {
     const q = window.__EnergyPieQueue.splice(0);
     q.forEach(d => window.__EnergyPieConsume(d));
   }
-  // Refresh on start + on fullscreen/resize/visibility changes
   safeRefreshSoon();
   document.addEventListener('visibilitychange', () => {
     if (!document.hidden) safeRefreshSoon();
diff --git a/Energy_Pie/module.php b/Energy_Pie/module.php
index e595682..5617e91 100644
--- a/Energy_Pie/module.php
+++ b/Energy_Pie/module.php
@@ -3,6 +3,7 @@
 declare(strict_types=1);
 class Energy_Pie extends IPSModule
 {
+    // Attribute keys for UI state
     private const ATTR_RANGE = 'Range';
     private const ATTR_DATE  = 'Date';
     public function Create(): void
@@ -13,30 +14,28 @@ class Energy_Pie extends IPSModule
         $this->RegisterPropertyInteger('VarConsumption', 0);
         $this->RegisterPropertyInteger('VarFeedIn', 0);
         $this->RegisterPropertyInteger('VarGrid', 0);
+        // Default range for first startup
+        $this->RegisterPropertyString('DefaultRange', 'day');
         // Persisted UI state
         $this->RegisterAttributeString(self::ATTR_RANGE, 'day');
         $this->RegisterAttributeString(self::ATTR_DATE, date('Y-m-d'));
         // Enable individual visualization (HTML-SDK)
         $this->SetVisualizationType(1);
-        // IMPORTANT: Timer calls global helper below (must exist!)
-        $this->RegisterTimer('AutoPush', 0, 'IPS_RequestAction($_IPS["TARGET"], "Refresh", 1);');
     }
     public function ApplyChanges(): void
     {
         parent::ApplyChanges();
-        // ensure range valid
+        // First-time init: if range is empty, set it to property default
         $range = $this->ReadAttributeString(self::ATTR_RANGE);
-        if (!in_array($range, ['day', 'week', 'month', 'total'], true)) {
-            $this->WriteAttributeString(self::ATTR_RANGE, 'day');
+        if ($range === '') {
+            $this->WriteAttributeString(self::ATTR_RANGE, $this->ReadPropertyString('DefaultRange'));
         }
-        // ensure date valid (not empty/invalid/future)
         $date = $this->ReadAttributeString(self::ATTR_DATE);
+        // Wenn Datum leer/ungültig oder in der Zukunft -> heute setzen
         if ($date === '' || !$this->isValidDate($date) || strtotime($date . ' 00:00:00') > time()) {
             $this->WriteAttributeString(self::ATTR_DATE, date('Y-m-d'));
         }
-        // Fullscreen-Fix: push periodically (adjust as you like)
-        // 2000ms = alle 2 Sekunden (stabil, aber nicht ganz so brutal wie 1000ms)
-        $this->SetTimerInterval('AutoPush', 2000);
+        // Push initial view data
         $this->RecalculateAndPush();
     }
     public function GetVisualizationTile(): string
@@ -53,15 +52,16 @@ class Energy_Pie extends IPSModule
             case 'SetRange':
                 $range = (string)$Value;
                 if (!in_array($range, ['day', 'week', 'month', 'total'], true)) {
-                    return;
+                    throw new Exception('Invalid range: ' . $range);
                 }
                 $this->WriteAttributeString(self::ATTR_RANGE, $range);
                 $this->RecalculateAndPush();
                 break;
             case 'SetDate':
+                // Expect YYYY-MM-DD from HTML <input type="date">
                 $date = (string)$Value;
                 if (!$this->isValidDate($date)) {
-                    return;
+                    throw new Exception('Invalid date: ' . $date);
                 }
                 $this->WriteAttributeString(self::ATTR_DATE, $date);
                 $this->RecalculateAndPush();
@@ -76,73 +76,98 @@ class Energy_Pie extends IPSModule
                 $this->RecalculateAndPush();
                 break;
             default:
-                // ignore unknown
-                return;
+                throw new Exception('Unknown Ident: ' . $Ident);
         }
     }
-    private function RecalculateAndPush(): void
-    {
-        $range = $this->ReadAttributeString(self::ATTR_RANGE);
-        $date  = $this->ReadAttributeString(self::ATTR_DATE);
-        [$tStart, $tEnd] = $this->getRange($range, $date);
-        $dbgProd = [];
-        $dbgFeed = [];
-        $dbgGrid = [];
-        $prod = $this->readDelta($this->ReadPropertyInteger('VarProduction'), $tStart, $tEnd, $dbgProd);
-        $feed = $this->readDelta($this->ReadPropertyInteger('VarFeedIn'),     $tStart, $tEnd, $dbgFeed);
-        $grid = $this->readDelta($this->ReadPropertyInteger('VarGrid'),       $tStart, $tEnd, $dbgGrid);
-        $hasData = (($dbgProd['count'] ?? 0) > 0) || (($dbgFeed['count'] ?? 0) > 0) || (($dbgGrid['count'] ?? 0) > 0);
-        // Auto-jump to last log day if none found
-        if (!$hasData && $range !== 'total') {
-            $lastTs = $this->getLastLogTimestamp($this->ReadPropertyInteger('VarProduction'));
-            if ($lastTs > 0) {
-                $this->WriteAttributeString(self::ATTR_DATE, date('Y-m-d', $lastTs));
-                $date = $this->ReadAttributeString(self::ATTR_DATE);
-                [$tStart, $tEnd] = $this->getRange($range, $date);
-                $prod = $this->readDelta($this->ReadPropertyInteger('VarProduction'), $tStart, $tEnd, $dbgProd);
-                $feed = $this->readDelta($this->ReadPropertyInteger('VarFeedIn'),     $tStart, $tEnd, $dbgFeed);
-                $grid = $this->readDelta($this->ReadPropertyInteger('VarGrid'),       $tStart, $tEnd, $dbgGrid);
-                $hasData = (($dbgProd['count'] ?? 0) > 0) || (($dbgFeed['count'] ?? 0) > 0) || (($dbgGrid['count'] ?? 0) > 0);
-            }
+    /**
+     * Compute values (later from archive), then push to tile via UpdateVisualizationValue.
+     */
+private function RecalculateAndPush(): void
+{
+
+
+    $range = $this->ReadAttributeString(self::ATTR_RANGE);
+    $date  = $this->ReadAttributeString(self::ATTR_DATE);
+    
+    [$tStart, $tEnd] = $this->getRange($range, $date);
+    // Debug-Container initialisieren (sonst "Undefined variable")
+    $dbgProd = [];
+    $dbgFeed = [];
+    $dbgGrid = [];
+    $prod = $this->readDelta($this->ReadPropertyInteger('VarProduction'), $tStart, $tEnd, $dbgProd);
+    $feed = $this->readDelta($this->ReadPropertyInteger('VarFeedIn'),     $tStart, $tEnd, $dbgFeed);
+    $grid = $this->readDelta($this->ReadPropertyInteger('VarGrid'),       $tStart, $tEnd, $dbgGrid);
+
+    $hasData = (($dbgProd['count'] ?? 0) > 0) || (($dbgFeed['count'] ?? 0) > 0) || (($dbgGrid['count'] ?? 0) > 0);
+    if (!$hasData && $range !== 'total') {
+        // nimm Produktion als Referenz für "letzte Daten"
+        $lastTs = $this->getLastLogTimestamp($this->ReadPropertyInteger('VarProduction'));
+        if ($lastTs > 0) {
+            $this->WriteAttributeString(self::ATTR_DATE, date('Y-m-d', $lastTs));
+            // Range neu berechnen für dieses Datum
+            $date = $this->ReadAttributeString(self::ATTR_DATE);
+            [$tStart, $tEnd] = $this->getRange($range, $date);
+            // Deltas nochmal holen (jetzt sollte count>0 werden)
+            $prod = $this->readDelta($this->ReadPropertyInteger('VarProduction'), $tStart, $tEnd, $dbgProd);
+            $feed = $this->readDelta($this->ReadPropertyInteger('VarFeedIn'),     $tStart, $tEnd, $dbgFeed);
+            $grid = $this->readDelta($this->ReadPropertyInteger('VarGrid'),       $tStart, $tEnd, $dbgGrid);
+            $hasData = (($dbgProd['count'] ?? 0) > 0) || (($dbgFeed['count'] ?? 0) > 0) || (($dbgGrid['count'] ?? 0) > 0);
         }
-        // House = Prod - Feed + Grid
-        $house = $prod - $feed + $grid;
-        if ($house < 0) $house = 0.0;
-        $payload = [
-            'range'   => $range,
-            'date'    => $date,
-            'tStart'  => $tStart,
-            'tEnd'    => $tEnd,
-            'hasData' => $hasData,
-            'values'  => [
-                'Produktion'    => (float)$prod,
-                'Einspeisung'   => (float)$feed,
-                'Netz'          => (float)$grid,
-                'Hausverbrauch' => (float)$house
-            ],
-            // kannst du später entfernen
-            'debug' => [
-                'prod' => $dbgProd,
-                'feed' => $dbgFeed,
-                'grid' => $dbgGrid
-            ]
-        ];
-        $this->UpdateVisualizationValue(json_encode($payload, JSON_THROW_ON_ERROR));
     }
+
+    $house = $prod - $feed + $grid;
+    if ($house < 0) $house = 0.0;
+    $payload = [
+        'range'  => $range,
+        'date'   => $date,
+        'tStart' => $tStart,
+        'tEnd'   => $tEnd,
+        'hasData' => $hasData,
+        'values' => [
+            'Produktion'    => (float)$prod,
+            'Einspeisung'   => (float)$feed,
+            'Netz'          => (float)$grid,
+            'Hausverbrauch' => (float)$house
+        ],
+        'debug' => [
+            'prod' => $dbgProd,
+            'feed' => $dbgFeed,
+            'grid' => $dbgGrid
+        ]
+    ];
+    $this->UpdateVisualizationValue(json_encode($payload, JSON_THROW_ON_ERROR));
+}
+
+    /**
+     * Range rules:
+     * - day: chosen date 00:00:00 .. next day 00:00:00
+     * - week: Monday 00:00:00 .. next Monday 00:00:00   (Mo–So)
+     * - month: first of month 00:00:00 .. first of next month 00:00:00
+     * - total: 0 .. now (placeholder)
+     */
     private function getRange(string $range, string $dateYmd): array
     {
         $now = time();
         if ($range === 'total') {
+            // Later: use oldest log timestamp as start
             return [0, $now];
         }
-        $base = strtotime($dateYmd . ' 00:00:00') ?: strtotime(date('Y-m-d') . ' 00:00:00');
+        $base = strtotime($dateYmd . ' 00:00:00');
+        if ($base === false) {
+            // fallback to today
+            $base = strtotime(date('Y-m-d') . ' 00:00:00');
+        }
         switch ($range) {
             case 'day':
-                return [$base, $base + 86400];
+                $start = $base;
+                $end   = $start + 86400;
+                return [$start, $end];
             case 'week':
-                $dow = (int)date('N', $base); // 1=Mon..7=Sun
-                $start = $base - (($dow - 1) * 86400);
-                return [$start, $start + 7 * 86400];
+                // date('N'): 1=Mon .. 7=Sun
+                $dow = (int)date('N', $base);
+                $start = $base - (($dow - 1) * 86400); // Monday
+                $end   = $start + (7 * 86400);         // next Monday
+                return [$start, $end];
             case 'month':
                 $start = strtotime(date('Y-m-01 00:00:00', $base));
                 $end   = strtotime(date('Y-m-01 00:00:00', strtotime('+1 month', $start)));
@@ -151,12 +176,7 @@ class Energy_Pie extends IPSModule
                 return [$base, $base + 86400];
         }
     }
-    public function GetVisualizationPopup(): string
-    {
-    // Popup (Fullscreen) soll das gleiche HTML wie das Tile anzeigen
-    $this->RecalculateAndPush();
-    return $this->GetVisualizationTile();
-    }
+
     private function readDelta(int $varId, int $tStart, int $tEnd, array &$dbg): float
     {
         $dbg = [
@@ -208,16 +228,24 @@ class Energy_Pie extends IPSModule
         if ($archiveID <= 0) {
             return 0;
         }
+        // Hole den letzten Eintrag (0..now, limit=1 -> der neueste)
         $values = @AC_GetLoggedValues($archiveID, $varId, 0, time(), 1);
         if (empty($values)) {
             return 0;
         }
+        // Bei limit=1 kommt genau ein Eintrag (der neueste)
         return (int)$values[0]['TimeStamp'];
     }
+
+
+    /**
+     * Buttons for quick navigation.
+     */
     private function ShiftDate(string $action): void
     {
         $range = $this->ReadAttributeString(self::ATTR_RANGE);
         if ($range === 'total') {
+            // total ignores date
             return;
         }
         if ($action === 'Today') {
@@ -225,7 +253,10 @@ class Energy_Pie extends IPSModule
             return;
         }
         $date = $this->ReadAttributeString(self::ATTR_DATE);
-        $base = strtotime($date . ' 00:00:00') ?: strtotime(date('Y-m-d') . ' 00:00:00');
+        $base = strtotime($date . ' 00:00:00');
+        if ($base === false) {
+            $base = strtotime(date('Y-m-d') . ' 00:00:00');
+        }
         $sign = ($action === 'Prev') ? -1 : 1;
         switch ($range) {
             case 'day':
@@ -242,13 +273,13 @@ class Energy_Pie extends IPSModule
     }
     private function isValidDate(string $ymd): bool
     {
+        // expects YYYY-MM-DD
         if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $ymd)) {
             return false;
         }
         [$y, $m, $d] = array_map('intval', explode('-', $ymd));
         return checkdate($m, $d, $y);
     }
+
 }
-
-
 ?>