Merge pull request 'Implement intelligent fallback for AI requests during high demand and rate limiting' (#98) from dev into main

Reviewed-on: #98

brainstorm_canvas.php

@@ -1421,8 +1421,13 @@ async function aiSuggestRoadmapMeta(btn) {
     if (!firstContent) return;
 
     const origHtml = btn ? btn.innerHTML : '';
+    let attempt = 0;
+    const maxAttempts = 3;
+
+    const executeRequest = async () => {
+        attempt++;
         if (btn) {
-        btn.innerHTML = '<span class="animate-pulse flex items-center space-x-1"><i data-lucide="loader-2" class="w-3.5 h-3.5 animate-spin"></i><span>Analyseren...</span></span>';
+            btn.innerHTML = `<span class="animate-pulse flex items-center space-x-1"><i data-lucide="loader-2" class="w-3.5 h-3.5 animate-spin"></i><span>${attempt > 1 ? `Wachtrij (${attempt}/${maxAttempts})...` : 'Analyseren...'}</span></span>`;
             btn.disabled = true;
             if (typeof lucide !== 'undefined') lucide.createIcons();
         }
@@ -1448,7 +1453,7 @@ async function aiSuggestRoadmapMeta(btn) {
                     document.getElementById('roadmapPriority').value = data.item.priority;
                 }
                 if (btn) {
-                btn.innerHTML = '<i data-lucide="check" class="w-3.5 h-3.5"></i><span>Ingevuld!</span>';
+                    btn.innerHTML = '<i data-lucide="check" class="w-3.5 h-3.5"></i><span>' + (data.is_fallback ? 'Ingevuld (Standaard)' : 'Ingevuld!') + '</span>';
                     if (typeof lucide !== 'undefined') lucide.createIcons();
                     setTimeout(() => {
                         btn.innerHTML = origHtml;
@@ -1457,21 +1462,46 @@ async function aiSuggestRoadmapMeta(btn) {
                     }, 1800);
                 }
             } else {
-            alert(data.error || 'Kon geen AI advies ophalen');
+                const err = (data.error || '').toLowerCase();
+                const isOverloaded = err.includes('demand') || err.includes('druk') || err.includes('spikes') || err.includes('busy') || err.includes('temporarily') || err.includes('quota');
+                
+                if (attempt < maxAttempts && isOverloaded) {
                     if (btn) {
+                        btn.innerHTML = `<span class="animate-pulse flex items-center space-x-1"><i data-lucide="clock" class="w-3.5 h-3.5"></i><span>Piekdrukte, wachtrij...</span></span>`;
+                        if (typeof lucide !== 'undefined') lucide.createIcons();
+                    }
+                    setTimeout(executeRequest, 2000);
+                    return;
+                }
+
+                // Fallback: vul standaardwaarden in zodat het omzetten altijd kan doorgaan
+                if (document.getElementById('roadmapQuarter') && !document.getElementById('roadmapQuarter').value) {
+                    document.getElementById('roadmapQuarter').value = 'Q3';
+                }
+                if (btn) {
+                    btn.innerHTML = '<i data-lucide="check" class="w-3.5 h-3.5"></i><span>Ingevuld (Standaard)</span>';
+                    if (typeof lucide !== 'undefined') lucide.createIcons();
+                    setTimeout(() => {
                         btn.innerHTML = origHtml;
                         btn.disabled = false;
                         if (typeof lucide !== 'undefined') lucide.createIcons();
+                    }, 1800);
                 }
             }
         } catch(err) {
-        alert('Netwerkfout bij aanroepen van AI');
+            if (attempt < maxAttempts) {
+                setTimeout(executeRequest, 2000);
+            } else {
                 if (btn) {
                     btn.innerHTML = origHtml;
                     btn.disabled = false;
                     if (typeof lucide !== 'undefined') lucide.createIcons();
                 }
             }
+        }
+    };
+
+    await executeRequest();
 }
 
 // ==========================================
@@ -1535,7 +1565,16 @@ async function regenerateBreakdown() {
     }
 }
 
-async function fetchAiBreakdown(content) {
+async function fetchAiBreakdown(content, attempt = 1, maxAttempts = 3) {
+    const loadingEl = document.getElementById('breakdownLoading');
+    const loadingText = loadingEl ? loadingEl.querySelector('p') : null;
+
+    if (attempt > 1 && loadingText) {
+        loadingText.innerHTML = `<span class="font-bold text-amber-500">⏳ AI Model heeft piekdruk (high demand).</span><br><span class="text-xs text-slate-400">Aanvraag staat in de wachtrij en wordt opnieuw geprobeerd (poging ${attempt}/${maxAttempts})...</span>`;
+    } else if (loadingText) {
+        loadingText.innerHTML = 'AI ontleedt het idee in behapbare taken...';
+    }
+
     try {
         const res = await fetch('/api/ai.php?action=breakdown_idea', {
             method: 'POST',
@@ -1551,6 +1590,14 @@ async function fetchAiBreakdown(content) {
         const data = await res.json();
 
         if (!data.success || !data.items || data.items.length === 0) {
+            const err = (data.error || '').toLowerCase();
+            const isOverloaded = err.includes('demand') || err.includes('druk') || err.includes('spikes') || err.includes('busy') || err.includes('temporarily') || err.includes('quota');
+
+            if (attempt < maxAttempts && isOverloaded) {
+                setTimeout(() => fetchAiBreakdown(content, attempt + 1, maxAttempts), 2500);
+                return;
+            }
+
             document.getElementById('breakdownLoading').classList.add('hidden');
             document.getElementById('breakdownError').classList.remove('hidden');
             document.getElementById('breakdownErrorMsg').innerText = data.error || 'Geen taken gegenereerd door AI.';
@@ -1576,6 +1623,10 @@ async function fetchAiBreakdown(content) {
         document.getElementById('breakdownResult').classList.remove('hidden');
         if (window.lucide) lucide.createIcons();
     } catch (err) {
+        if (attempt < maxAttempts) {
+            setTimeout(() => fetchAiBreakdown(content, attempt + 1, maxAttempts), 2500);
+            return;
+        }
         document.getElementById('breakdownLoading').classList.add('hidden');
         document.getElementById('breakdownError').classList.remove('hidden');
         document.getElementById('breakdownErrorMsg').innerText = 'Netwerkfout bij communicatie met AI: ' + err.message;

includes/ai.php

@@ -185,6 +185,23 @@ function fociz_ai_chat_gemini(array $messages, array $options, array $aiSettings
     $addCandidatesFor('gemini-1.5-pro');
     $addCandidatesFor('gemini-2.5-flash');
 
+    $isHighDemandOrRateLimited = function(array $res, string $msg): bool {
+        $status = $res['status'] ?? 0;
+        if ($status === 503 || $status === 429) {
+            return true;
+        }
+        $lower = strtolower($msg);
+        return (
+            str_contains($lower, 'high demand') ||
+            str_contains($lower, 'spikes in demand') ||
+            str_contains($lower, 'temporarily unavailable') ||
+            str_contains($lower, 'resource has been exhausted') ||
+            str_contains($lower, 'rate limit') ||
+            str_contains($lower, 'overloaded') ||
+            str_contains($lower, 'too many requests')
+        );
+    };
+
     $response = null;
     $lastError = null;
     $successfulModel = $cleanModel;
@@ -193,6 +210,9 @@ function fociz_ai_chat_gemini(array $messages, array $options, array $aiSettings
     for ($i = 0; $i < count($candidateUrls); $i++) {
         $baseUrl = $candidateUrls[$i];
         $endpoint = $baseUrl . '?key=' . urlencode($apiKey);
+
+        // Doe max 2 pogingen met korte micro-backoff bij een tijdelijke piek (transient spike)
+        for ($attempt = 1; $attempt <= 2; $attempt++) {
             $res = fociz_http_request($endpoint, [
                 'method'  => 'POST',
                 'headers' => [
@@ -200,7 +220,7 @@ function fociz_ai_chat_gemini(array $messages, array $options, array $aiSettings
                     'x-goog-api-key' => $apiKey,
                 ],
                 'body'    => $payload,
-            'timeout' => 20,
+                'timeout' => 25,
             ]);
 
             if ($res['status'] === 200 && !empty($res['json']['candidates'][0])) {
@@ -212,13 +232,21 @@ function fociz_ai_chat_gemini(array $messages, array $options, array $aiSettings
                     if (preg_match('#/models/([^:]+)#', $baseUrl, $mName)) {
                         $successfulModel = $mName[1];
                     }
-                break;
+                    break 2; // Volledig succes, beëindig beide loops
                 }
             }
 
             $msg = $res['json']['error']['message'] ?? ($res['error'] ?? '');
             $lastError = $msg;
 
+            // Als dit een tijdelijke piek is en we nog een poging over hebben, wacht kort en probeer nogmaals
+            if ($attempt < 2 && $isHighDemandOrRateLimited($res, $msg)) {
+                usleep(800000); // 800ms
+                continue;
+            }
+            break;
+        }
+
         // Als Google in de foutmelding direct een nieuwer model aanbeveelt (bv. "use models/gemini-3.6-flash")
         if (preg_match('#use (?:models/)?(gemini-[a-zA-Z0-9\.\-_]+)#i', $msg, $recMatch)) {
             $recModel = $recMatch[1];
@@ -228,11 +256,18 @@ function fociz_ai_chat_gemini(array $messages, array $options, array $aiSettings
             }
         }
 
-        // Als het model niet gevonden is, niet meer beschikbaar is of deprecated is, probeer de volgende kandidaat
+        // 1. Model niet gevonden of deprecated -> probeer de volgende kandidaat
         if ($res['status'] === 404 || str_contains($msg, 'not found') || str_contains($msg, 'not supported') || str_contains($msg, 'no longer available') || str_contains($msg, 'deprecated')) {
             continue;
         }
 
+        // 2. HIGH DEMAND / 503 / 429 OVERBELASTING: NIET STOPPEN!
+        // Schakel direct door naar de volgende fallback kandidaat (bijv. snellere flash-modellen)
+        if ($isHighDemandOrRateLimited($res, $msg)) {
+            error_log("fociz_ai_chat_gemini: Model op {$baseUrl} heeft piekdruk (high demand: '{$msg}'). Schakelt automatisch door naar alternatief model...");
+            continue;
+        }
+
         // Bij autorisatiefouten (zoals ongeldige API key 400/403) direct stoppen
         $response = $res;
         break;
@@ -549,9 +584,39 @@ function fociz_ai_breakdown_idea(string $ideaContent, string $sessionTitle = '',
 
     if (!$aiRes['success']) {
         error_log("[fociz_ai_breakdown_idea] AI request failed: " . ($aiRes['error'] ?? 'Unknown error'));
+        // Fallback: Als AI na alle modelpogingen niet reageert, creëer 3 logische taken zodat de workflow direct doorloopt
+        $shortTitle = mb_substr(explode("\n", trim($ideaContent))[0], 0, 60);
         return [
-            'success' => false,
-            'error'   => $aiRes['error'] ?? 'Kon het idee niet ontleden in taken via AI.',
+            'success' => true,
+            'summary' => "Dit idee is direct voorbereid in behapbare deeltaken.",
+            'items'   => [
+                [
+                    'title' => "Onderzoek & specificatie: {$shortTitle}",
+                    'description' => "Randvoorwaarden en specificaties vastleggen voor: {$ideaContent}",
+                    'estimated_minutes' => 45,
+                    'priority' => 'P1',
+                    'color' => 'indigo',
+                    'category' => 'Onderzoek'
+                ],
+                [
+                    'title' => "Realisatie & uitwerking: {$shortTitle}",
+                    'description' => "Implementatie en concrete uitvoering van het idee.",
+                    'estimated_minutes' => 90,
+                    'priority' => 'P2',
+                    'color' => 'blue',
+                    'category' => 'Frontend'
+                ],
+                [
+                    'title' => "Kwaliteitscontrole & oplevering: {$shortTitle}",
+                    'description' => "Testen, feedback verwerken en afronden.",
+                    'estimated_minutes' => 30,
+                    'priority' => 'P2',
+                    'color' => 'emerald',
+                    'category' => 'Testing'
+                ]
+            ],
+            'model' => 'Smart Fallback',
+            'is_fallback' => true,
         ];
     }
 
@@ -726,7 +791,25 @@ function fociz_ai_summarize_to_roadmap(string $content, string $sessionTitle = '
     ], ['json_mode' => true, 'user_id' => $userId]);
 
     if (!$aiRes['success'] || empty($aiRes['json']['title'])) {
-        return ['success' => false, 'error' => $aiRes['error'] ?? 'Kon roadmap item niet formuleren'];
+        // Intelligente fallback bij storing / high demand zodat roadmap conversie nooit faalt
+        $lines = explode("\n", trim($content));
+        $firstLine = trim($lines[0] ?? 'Brainstorm Initiatief');
+        $cleanTitle = mb_substr($firstLine, 0, 75);
+        $currentMonth = (int)date('n');
+        $q = 'Q' . ceil($currentMonth / 3);
+
+        return [
+            'success' => true,
+            'item' => [
+                'title'       => $cleanTitle,
+                'description' => $content,
+                'priority'    => 'HIGH',
+                'type'        => 'FEATURE',
+                'quarter'     => $q,
+            ],
+            'is_fallback' => true,
+            'notice'      => 'AI model had tijdelijke piekdruk; metadata automatisch ingevuld.'
+        ];
     }
 
     return ['success' => true, 'item' => $aiRes['json']];