feat: AI image classification and dynamic fallback assignment

lib/image-matcher.ts

@@ -0,0 +1,70 @@
+import metadataJson from '../public/assets/image-metadata.json';
+
+export interface ImageMeta {
+  file: string;
+  category: 'pv' | 'wind' | 'fiber' | 'power' | 'battery' | 'unknown';
+  environment: 'freies_feld' | 'urban' | 'wald' | 'indoor' | 'unknown';
+  quality_score: number;
+  description: string;
+}
+
+const metadata = metadataJson as Record<string, ImageMeta>;
+
+// Create a deterministic pseudo-random number based on a string
+function hashString(str: string): number {
+  let hash = 0;
+  for (let i = 0; i < str.length; i++) {
+    const char = str.charCodeAt(i);
+    hash = (hash << 5) - hash + char;
+    hash = hash & hash; // Convert to 32bit integer
+  }
+  return Math.abs(hash);
+}
+
+/**
+ * Returns a fitting, highly-rated image for a specific project type.
+ * It is deterministic based on the seed (e.g. project ID).
+ */
+export function getImageForProject(seed: string, category: string): string {
+  const allImages = Object.values(metadata);
+  
+  // 1. Filter by category
+  let candidates = allImages.filter(img => img.category === category);
+  
+  // If no candidates for category, fallback to fiber (Kabeltiefbau is safe default for ETIB)
+  if (candidates.length === 0) {
+    candidates = allImages.filter(img => img.category === 'fiber');
+  }
+
+  // Still empty? Just get anything highly rated
+  if (candidates.length === 0) {
+    candidates = allImages;
+  }
+
+  // 2. Sort by quality score (descending)
+  candidates.sort((a, b) => b.quality_score - a.quality_score);
+
+  // 3. For PV and Wind, strongly prefer 'freies_feld'
+  if (category === 'pv' || category === 'wind') {
+    const fieldCandidates = candidates.filter(img => img.environment === 'freies_feld' && img.quality_score >= 6);
+    if (fieldCandidates.length > 0) {
+      candidates = fieldCandidates;
+    }
+  } else {
+    // For others, just take top 30% quality to have some variation
+    candidates = candidates.filter(img => img.quality_score >= 6);
+    if (candidates.length === 0) {
+      candidates = allImages.filter(img => img.category === category);
+    }
+  }
+
+  if (candidates.length === 0) {
+    return '/assets/logo.png'; // Ultimate fallback
+  }
+
+  // 4. Deterministically pick one based on the seed
+  const hash = hashString(seed);
+  const index = hash % candidates.length;
+  
+  return candidates[index].file;
+}