Add neat arena

src/lib/neatArena/exportImport.ts

@@ -0,0 +1,120 @@
+import type { Genome } from './genome';
+import type { EvolutionConfig } from './evolution';
+
+/**
+ * Export/Import system for trained genomes.
+ * 
+ * Allows saving champion genomes as JSON files and loading them back
+ * for exhibition matches or continued training.
+ */
+
+export interface ExportedGenome {
+    version: string;
+    timestamp: number;
+    config: {
+        inputCount: number;
+        outputCount: number;
+    };
+    genome: Genome;
+    metadata?: {
+        generation?: number;
+        fitness?: number;
+        speciesCount?: number;
+    };
+}
+
+const EXPORT_VERSION = '1.0.0';
+
+/**
+ * Export a genome to a downloadable JSON format
+ */
+export function exportGenome(
+    genome: Genome,
+    config: EvolutionConfig,
+    metadata?: ExportedGenome['metadata']
+): ExportedGenome {
+    return {
+        version: EXPORT_VERSION,
+        timestamp: Date.now(),
+        config: {
+            inputCount: config.inputCount,
+            outputCount: config.outputCount,
+        },
+        genome: {
+            nodes: genome.nodes,
+            connections: genome.connections,
+            fitness: genome.fitness,
+        },
+        metadata,
+    };
+}
+
+/**
+ * Import a genome from JSON
+ */
+export function importGenome(exported: ExportedGenome): {
+    genome: Genome;
+    config: { inputCount: number; outputCount: number };
+} {
+    // Version check
+    if (exported.version !== EXPORT_VERSION) {
+        console.warn(`Imported genome version ${exported.version} may be incompatible with current version ${EXPORT_VERSION}`);
+    }
+    
+    return {
+        genome: exported.genome,
+        config: exported.config,
+    };
+}
+
+/**
+ * Download genome as JSON file
+ */
+export function downloadGenomeAsFile(exported: ExportedGenome, filename?: string): void {
+    const json = JSON.stringify(exported, null, 2);
+    const blob = new Blob([json], { type: 'application/json' });
+    const url = URL.createObjectURL(blob);
+    
+    const link = document.createElement('a');
+    link.href = url;
+    link.download = filename || `neat-champion-${Date.now()}.json`;
+    document.body.appendChild(link);
+    link.click();
+    document.body.removeChild(link);
+    
+    URL.revokeObjectURL(url);
+}
+
+/**
+ * Upload and parse genome from file
+ */
+export function uploadGenomeFromFile(): Promise<ExportedGenome> {
+    return new Promise((resolve, reject) => {
+        const input = document.createElement('input');
+        input.type = 'file';
+        input.accept = 'application/json,.json';
+        
+        input.onchange = (e) => {
+            const file = (e.target as HTMLInputElement).files?.[0];
+            if (!file) {
+                reject(new Error('No file selected'));
+                return;
+            }
+            
+            const reader = new FileReader();
+            reader.onload = (event) => {
+                try {
+                    const json = event.target?.result as string;
+                    const exported = JSON.parse(json) as ExportedGenome;
+                    resolve(exported);
+                } catch (err) {
+                    reject(new Error('Failed to parse genome file'));
+                }
+            };
+            reader.onerror = () => reject(new Error('Failed to read file'));
+            reader.readAsText(file);
+        };
+        
+        input.click();
+    });
+}