fix(embedder): Use FQCN for embedder model config, to allow any Model child class

Author: welcoMattic

src/DependencyInjection/Configuration.php

@@ -197,7 +197,7 @@ public function getConfigTreeBuilder(): TreeBuilder
                             ->end()
                             ->arrayNode('model')
                                 ->children()
-                                    ->scalarNode('name')->isRequired()->end()
+                                    ->scalarNode('className')->isRequired()->end()
                                     ->scalarNode('version')->defaultNull()->end()
                                     ->arrayNode('options')
                                         ->scalarPrototype()->end()

src/DependencyInjection/LlmChainExtension.php

@@ -457,14 +457,13 @@ private function processStoreConfig(string $type, array $stores, ContainerBuilde
      */
     private function processEmbedderConfig(int|string $name, array $config, ContainerBuilder $container): void
     {
-        ['name' => $modelName, 'version' => $version, 'options' => $options] = $config['model'];
+        ['className' => $modelClassName, 'version' => $version, 'options' => $options] = $config['model'];
 
-        $modelClass = match (strtolower((string) $modelName)) {
-            'embeddings' => Embeddings::class,
-            'voyage' => Voyage::class,
-            default => throw new \InvalidArgumentException(sprintf('Model "%s" is not supported.', $modelName)),
-        };
-        $modelDefinition = (new Definition($modelClass));
+        if (!is_a($modelClassName, Model::class)) {
+            throw new \InvalidArgumentException(sprintf('"%s" class is not extending PhpLlm\LlmChain\Platform\Model.', $modelClassName));
+        }
+
+        $modelDefinition = (new Definition($modelClassName));
         if (null !== $version) {
             $modelDefinition->setArgument('$name', $version);
         }