[AI Bundle] Fix unresolved Distance enum dependencies in configuration

The options.php file was importing Distance enums from optional store bridge
packages (postgres-store and redis-store) unconditionally. This caused errors
when these packages weren't installed since PHP tries to resolve imports at
parse time.

The fix uses string values for the distance configuration instead of enum
references, and converts them to enums in AiBundle.php only after verifying
the package is installed via willBeAvailable().

Author: OskarStark

src/ai-bundle/config/options.php

@@ -18,8 +18,6 @@
 use Symfony\AI\Platform\Capability;
 use Symfony\AI\Platform\Model;
 use Symfony\AI\Platform\PlatformInterface;
-use Symfony\AI\Store\Bridge\Postgres\Distance as PostgresDistance;
-use Symfony\AI\Store\Bridge\Redis\Distance;
 use Symfony\AI\Store\Document\VectorizerInterface;
 use Symfony\AI\Store\StoreInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
@@ -794,8 +792,8 @@
                                 ->end()
                                 ->enumNode('distance')
                                     ->info('Distance metric to use for vector similarity search')
-                                    ->enumFqcn(PostgresDistance::class)
-                                    ->defaultValue(PostgresDistance::L2)
+                                    ->values(['cosine', 'inner_product', 'l1', 'l2'])
+                                    ->defaultValue('l2')
                                 ->end()
                                 ->stringNode('dbal_connection')->cannotBeEmpty()->end()
                             ->end()
@@ -844,8 +842,8 @@
                                 ->end()
                                 ->enumNode('distance')
                                     ->info('Distance metric to use for vector similarity search')
-                                    ->values(Distance::cases())
-                                    ->defaultValue(Distance::Cosine)
+                                    ->values(['COSINE', 'L2', 'IP'])
+                                    ->defaultValue('COSINE')
                                 ->end()
                             ->end()
                             ->validate()

src/ai-bundle/src/AiBundle.php

@@ -92,8 +92,10 @@
 use Symfony\AI\Store\Bridge\Neo4j\Store as Neo4jStore;
 use Symfony\AI\Store\Bridge\OpenSearch\Store as OpenSearchStore;
 use Symfony\AI\Store\Bridge\Pinecone\Store as PineconeStore;
+use Symfony\AI\Store\Bridge\Postgres\Distance as PostgresDistance;
 use Symfony\AI\Store\Bridge\Postgres\Store as PostgresStore;
 use Symfony\AI\Store\Bridge\Qdrant\Store as QdrantStore;
+use Symfony\AI\Store\Bridge\Redis\Distance as RedisDistance;
 use Symfony\AI\Store\Bridge\Redis\Store as RedisStore;
 use Symfony\AI\Store\Bridge\Supabase\Store as SupabaseStore;
 use Symfony\AI\Store\Bridge\SurrealDb\Store as SurrealDbStore;
@@ -1437,9 +1439,7 @@ private function processStoreConfig(string $type, array $stores, ContainerBuilde
                     ];
                 }
 
-                if (\array_key_exists('distance', $store)) {
-                    $arguments[3] = $store['distance'];
-                }
+                $arguments[3] = PostgresDistance::from($store['distance']);
 
                 $definition
                     ->setLazy(true)
@@ -1507,7 +1507,7 @@ private function processStoreConfig(string $type, array $stores, ContainerBuilde
                         $redisClient,
                         $store['index_name'] ?? $name,
                         $store['key_prefix'],
-                        $store['distance'],
+                        RedisDistance::from($store['distance']),
                     ])
                     ->addTag('proxy', ['interface' => StoreInterface::class])
                     ->addTag('proxy', ['interface' => ManagedStoreInterface::class])

src/ai-bundle/tests/DependencyInjection/AiBundleTest.php

@@ -45,7 +45,7 @@
 use Symfony\AI\Store\Bridge\Neo4j\Store as Neo4jStore;
 use Symfony\AI\Store\Bridge\OpenSearch\Store as OpenSearchStore;
 use Symfony\AI\Store\Bridge\Pinecone\Store as PineconeStore;
-use Symfony\AI\Store\Bridge\Postgres\Distance;
+use Symfony\AI\Store\Bridge\Postgres\Distance as PostgresDistance;
 use Symfony\AI\Store\Bridge\Postgres\Store as PostgresStore;
 use Symfony\AI\Store\Bridge\Qdrant\Store as QdrantStore;
 use Symfony\AI\Store\Bridge\Redis\Distance as RedisDistance;
@@ -2588,7 +2588,7 @@ public function testPostgresStoreWithDifferentConnectionCanBeConfigured()
         $this->assertSame('my_connection', (string) $definition->getArgument(0));
         $this->assertSame('db', $definition->getArgument(1));
         $this->assertSame('foo', $definition->getArgument(2));
-        $this->assertSame(Distance::L2, $definition->getArgument(3));
+        $this->assertSame(PostgresDistance::L2, $definition->getArgument(3));
 
         $this->assertTrue($definition->hasTag('proxy'));
         $this->assertSame([
@@ -2609,7 +2609,7 @@ public function testPostgresStoreWithDifferentConnectionCanBeConfigured()
                         'db' => [
                             'dbal_connection' => 'my_connection',
                             'vector_field' => 'foo',
-                            'distance' => Distance::L1->value,
+                            'distance' => PostgresDistance::L1->value,
                         ],
                     ],
                 ],
@@ -2625,7 +2625,7 @@ public function testPostgresStoreWithDifferentConnectionCanBeConfigured()
         $this->assertSame('my_connection', (string) $definition->getArgument(0));
         $this->assertSame('db', $definition->getArgument(1));
         $this->assertSame('foo', $definition->getArgument(2));
-        $this->assertSame(Distance::L1, $definition->getArgument(3));
+        $this->assertSame(PostgresDistance::L1, $definition->getArgument(3));
 
         $this->assertTrue($definition->hasTag('proxy'));
         $this->assertSame([
@@ -2647,7 +2647,7 @@ public function testPostgresStoreWithDifferentConnectionCanBeConfigured()
                             'dbal_connection' => 'my_connection',
                             'table_name' => 'foo',
                             'vector_field' => 'foo',
-                            'distance' => Distance::L1->value,
+                            'distance' => PostgresDistance::L1->value,
                         ],
                     ],
                 ],
@@ -2663,7 +2663,7 @@ public function testPostgresStoreWithDifferentConnectionCanBeConfigured()
         $this->assertSame('my_connection', (string) $definition->getArgument(0));
         $this->assertSame('foo', $definition->getArgument(1));
         $this->assertSame('foo', $definition->getArgument(2));
-        $this->assertSame(Distance::L1, $definition->getArgument(3));
+        $this->assertSame(PostgresDistance::L1, $definition->getArgument(3));
 
         $this->assertTrue($definition->hasTag('proxy'));
         $this->assertSame([
@@ -2997,7 +2997,7 @@ public function testRedisStoreWithCustomDistanceCanBeConfigured()
                         'my_redis_store' => [
                             'client' => 'foo',
                             'index_name' => 'my_vector_index',
-                            'distance' => RedisDistance::L2,
+                            'distance' => RedisDistance::L2->value,
                         ],
                     ],
                 ],
@@ -7217,7 +7217,7 @@ private function getFullConfig(): array
                         'my_redis_store_with_custom_distance' => [
                             'client' => 'foo',
                             'index_name' => 'my_vector_index',
-                            'distance' => RedisDistance::L2,
+                            'distance' => RedisDistance::L2->value,
                         ],
                     ],
                     'supabase' => [