Return ChatResponseMetadata with BedrockAnthropic3ChatModel call prompt method.

Include id, model, inputTokens and outputTokens usage data.

Author: dafriz

models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/anthropic3/BedrockAnthropic3ChatModel.java

@@ -23,6 +23,8 @@
 
 import org.springframework.ai.chat.messages.AssistantMessage;
 import org.springframework.ai.chat.messages.UserMessage;
+import org.springframework.ai.chat.metadata.ChatResponseMetadata;
+import org.springframework.ai.chat.metadata.Usage;
 import reactor.core.publisher.Flux;
 
 import org.springframework.ai.bedrock.anthropic3.api.Anthropic3ChatBedrockApi;
@@ -83,11 +85,16 @@ public ChatResponse call(Prompt prompt) {
 
 		List<Generation> generations = response.content().stream().map(content -> {
 			return new Generation(new AssistantMessage(content.text()),
-					ChatGenerationMetadata.from(response.stopReason(), new Anthropic3ChatBedrockApi.AnthropicUsage(
-							response.usage().inputTokens(), response.usage().outputTokens())));
+					ChatGenerationMetadata.from(response.stopReason(), null));
 		}).toList();
 
-		return new ChatResponse(generations);
+		ChatResponseMetadata metadata = ChatResponseMetadata.builder()
+			.withId(response.id())
+			.withModel(response.model())
+			.withUsage(extractUsage(response))
+			.build();
+
+		return new ChatResponse(generations, metadata);
 	}
 
 	@Override
@@ -117,6 +124,21 @@ public Flux<ChatResponse> stream(Prompt prompt) {
 		});
 	}
 
+	private Usage extractUsage(AnthropicChatResponse response) {
+		return new Usage() {
+
+			@Override
+			public Long getPromptTokens() {
+				return response.usage().inputTokens().longValue();
+			}
+
+			@Override
+			public Long getGenerationTokens() {
+				return response.usage().outputTokens().longValue();
+			}
+		};
+	}
+
 	/**
 	 * Accessible for testing.
 	 */