Enhance MiniMax chat model compatibility and add tests

- Add web search mode response in choice.message for enhanced
compatibility
- Implement web search mode for stream mode
- Add comprehensive unit tests for new features

Related to #1292

feat: enhance the compatibility of the minimax model and tests, related issue #1292

models/spring-ai-minimax/src/main/java/org/springframework/ai/minimax/MiniMaxChatModel.java

@@ -17,7 +17,6 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import org.springframework.ai.chat.messages.AssistantMessage;
 import org.springframework.ai.chat.messages.MessageType;
 import org.springframework.ai.chat.messages.ToolResponseMessage;
@@ -57,9 +56,12 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
+import static org.springframework.ai.minimax.api.MiniMaxApiConstants.TOOL_CALL_FUNCTION_TYPE;
+
 /**
  * {@link ChatModel} and {@link StreamingChatModel} implementation for {@literal MiniMax}
  * backed by {@link MiniMaxApi}.
@@ -169,12 +171,21 @@ public ChatResponse call(Prompt prompt) {
 
 		List<Generation> generations = choices.stream().map(choice -> {
 			// @formatter:off
+			// if the choice is a web search tool call, return last message of choice.messages
+			ChatCompletionMessage message = null;
+			if(choice.message() != null) {
+				message = choice.message();
+			} else if(!CollectionUtils.isEmpty(choice.messages())){
+				// the MiniMax web search messages result is ['user message','assistant tool call', 'tool call', 'assistant message']
+				// so the last message is the assistant message
+				message = choice.messages().get(choice.messages().size() - 1);
+			}
 			Map<String, Object> metadata = Map.of(
 					"id", chatCompletion.id(),
-					"role", choice.message().role() != null ? choice.message().role().name() : "",
+					"role", message != null && message.role() != null ? message.role().name() : "",
 					"finishReason", choice.finishReason() != null ? choice.finishReason().name() : "");
 			// @formatter:on
-			return buildGeneration(choice, metadata);
+			return buildGeneration(message, choice.finishReason(), metadata);
 		}).toList();
 
 		ChatResponse chatResponse = new ChatResponse(generations, from(completionEntity.getBody()));
@@ -224,7 +235,7 @@ public Flux<ChatResponse> stream(Prompt prompt) {
 									"role", roleMap.getOrDefault(id, ""),
 									"finishReason", choice.finishReason() != null ? choice.finishReason().name() : "");
 							return buildGeneration(choice, metadata);
-						}).toList();
+						}).filter(Objects::nonNull).toList();
 						// @formatter:on
 
 					if (chatCompletion2.usage() != null) {
@@ -250,12 +261,28 @@ public Flux<ChatResponse> stream(Prompt prompt) {
 				// conversation that contains the call responses.
 				return this.stream(new Prompt(toolCallConversation, prompt.getOptions()));
 			}
-			else {
-				return Flux.just(response);
-			}
+			return Flux.just(response);
 		});
 	}
 
+	/**
+	 * The MimiMax web search function tool type is 'web_search', so we need to filter out
+	 * the tool calls whose type is not 'function'
+	 * @param generation the generation to check
+	 * @param toolCallFinishReasons the tool call finish reasons
+	 * @return true if the generation is a tool call
+	 */
+	@Override
+	protected boolean isToolCall(Generation generation, Set<String> toolCallFinishReasons) {
+		if (!super.isToolCall(generation, toolCallFinishReasons)) {
+			return false;
+		}
+		return generation.getOutput()
+			.getToolCalls()
+			.stream()
+			.anyMatch(toolCall -> TOOL_CALL_FUNCTION_TYPE.equals(toolCall.type()));
+	}
+
 	private ChatResponseMetadata from(ChatCompletion result, RateLimit rateLimit) {
 		Assert.notNull(result, "MiniMax ChatCompletionResult must not be null");
 		return ChatResponseMetadata.builder()
@@ -277,21 +304,28 @@ private ChatResponseMetadata from(ChatCompletion result) {
 			.build();
 	}
 
-	private static Generation buildGeneration(Choice choice, Map<String, Object> metadata) {
-		List<AssistantMessage.ToolCall> toolCalls = choice.message().toolCalls() == null ? List.of()
-				: choice.message()
-					.toolCalls()
+	private Generation buildGeneration(ChatCompletionMessage message, ChatCompletionFinishReason completionFinishReason,
+			Map<String, Object> metadata) {
+		if (message == null || message.role() == Role.TOOL) {
+			return null;
+		}
+		List<AssistantMessage.ToolCall> toolCalls = message.toolCalls() == null ? List.of()
+				: message.toolCalls()
 					.stream()
-					.map(toolCall -> new AssistantMessage.ToolCall(toolCall.id(), "function",
+					.map(toolCall -> new AssistantMessage.ToolCall(toolCall.id(), toolCall.type(),
 							toolCall.function().name(), toolCall.function().arguments()))
 					.toList();
 
-		var assistantMessage = new AssistantMessage(choice.message().content(), metadata, toolCalls);
-		String finishReason = (choice.finishReason() != null ? choice.finishReason().name() : "");
+		var assistantMessage = new AssistantMessage(message.content(), metadata, toolCalls);
+		String finishReason = (completionFinishReason != null ? completionFinishReason.name() : "");
 		var generationMetadata = ChatGenerationMetadata.from(finishReason, null);
 		return new Generation(assistantMessage, generationMetadata);
 	}
 
+	private Generation buildGeneration(Choice choice, Map<String, Object> metadata) {
+		return buildGeneration(choice.message(), choice.finishReason(), metadata);
+	}
+
 	/**
 	 * Convert the ChatCompletionChunk into a ChatCompletion. The Usage is set to null.
 	 * @param chunk the ChatCompletionChunk to convert

models/spring-ai-minimax/src/main/java/org/springframework/ai/minimax/api/MiniMaxApiConstants.java

@@ -10,4 +10,6 @@ public final class MiniMaxApiConstants {
 
 	public static final String DEFAULT_BASE_URL = "https://api.minimax.chat";
 
+	public static final String TOOL_CALL_FUNCTION_TYPE = "function";
+
 }

models/spring-ai-minimax/src/test/java/org/springframework/ai/minimax/chat/MiniMaxChatOptionsTests.java

@@ -2,25 +2,35 @@
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.ai.chat.messages.AssistantMessage;
 import org.springframework.ai.chat.messages.Message;
 import org.springframework.ai.chat.messages.UserMessage;
 import org.springframework.ai.chat.model.ChatResponse;
+import org.springframework.ai.chat.model.Generation;
 import org.springframework.ai.chat.prompt.Prompt;
 import org.springframework.ai.minimax.MiniMaxChatModel;
 import org.springframework.ai.minimax.MiniMaxChatOptions;
 import org.springframework.ai.minimax.api.MiniMaxApi;
+import reactor.core.publisher.Flux;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.ai.minimax.api.MiniMaxApi.ChatModel.ABAB_6_5_S_Chat;
 
 /**
  * @author Geng Rong
  */
 @EnabledIfEnvironmentVariable(named = "MINIMAX_API_KEY", matches = ".+")
 public class MiniMaxChatOptionsTests {
 
+	private static final Logger logger = LoggerFactory.getLogger(MiniMaxChatOptionsTests.class);
+
 	private final MiniMaxChatModel chatModel = new MiniMaxChatModel(new MiniMaxApi(System.getenv("MINIMAX_API_KEY")));
 
 	@Test
@@ -46,4 +56,72 @@ void testMarkSensitiveInfo() {
 		assertThat(unmaskResponseContent).contains("133-12345678");
 	}
 
+	/**
+	 * There is a certain probability of failure, because it needs to be searched through
+	 * the network, which may cause the test to fail due to different search results. And
+	 * the search results are related to time. For example, after the start of the Paris
+	 * Paralympic Games, searching for the number of gold medals in the Paris Olympics may
+	 * be affected by the search results of the number of gold medals in the Paris
+	 * Paralympic Games with higher priority by the search engine. Even if the input is an
+	 * English question, there may be get Chinese content, because the main training
+	 * content of MiniMax and search engine are Chinese
+	 */
+	@Test
+	void testWebSearch() {
+		UserMessage userMessage = new UserMessage(
+				"How many gold medals has the United States won in total at the 2024 Olympics?");
+
+		List<Message> messages = new ArrayList<>(List.of(userMessage));
+
+		List<MiniMaxApi.FunctionTool> functionTool = List.of(MiniMaxApi.FunctionTool.webSearchFunctionTool());
+
+		MiniMaxChatOptions options = MiniMaxChatOptions.builder()
+			.withModel(ABAB_6_5_S_Chat.value)
+			.withTools(functionTool)
+			.build();
+
+		ChatResponse response = chatModel.call(new Prompt(messages, options));
+		String responseContent = response.getResult().getOutput().getContent();
+
+		assertThat(responseContent).contains("40");
+	}
+
+	/**
+	 * There is a certain probability of failure, because it needs to be searched through
+	 * the network, which may cause the test to fail due to different search results. And
+	 * the search results are related to time. For example, after the start of the Paris
+	 * Paralympic Games, searching for the number of gold medals in the Paris Olympics may
+	 * be affected by the search results of the number of gold medals in the Paris
+	 * Paralympic Games with higher priority by the search engine. Even if the input is an
+	 * English question, there may be get Chinese content, because the main training
+	 * content of MiniMax and search engine of MiniMax are Chinese
+	 */
+	@Test
+	void testWebSearchStream() {
+		UserMessage userMessage = new UserMessage(
+				"How many gold medals has the United States won in total at the 2024 Olympics?");
+
+		List<Message> messages = new ArrayList<>(List.of(userMessage));
+
+		List<MiniMaxApi.FunctionTool> functionTool = List.of(MiniMaxApi.FunctionTool.webSearchFunctionTool());
+
+		MiniMaxChatOptions options = MiniMaxChatOptions.builder()
+			.withModel(ABAB_6_5_S_Chat.value)
+			.withTools(functionTool)
+			.build();
+
+		Flux<ChatResponse> response = chatModel.stream(new Prompt(messages, options));
+		String content = Objects.requireNonNull(response.collectList().block())
+			.stream()
+			.map(ChatResponse::getResults)
+			.flatMap(List::stream)
+			.map(Generation::getOutput)
+			.map(AssistantMessage::getContent)
+			.filter(Objects::nonNull)
+			.collect(Collectors.joining());
+		logger.info("Response: {}", content);
+
+		assertThat(content).contains("40");
+	}
+
 }