Add web search capability to MiniMax model

Implement web search functionality for the MiniMax model.
Includes unit tests
This enhancement expands the model's ability to access and utilize current information from the internet.

Resolves #1245

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

@@ -17,6 +17,7 @@ package org.springframework.ai.minimax;
 
 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;
@@ -302,7 +303,7 @@ public class MiniMaxChatModel extends AbstractToolCallSupport implements ChatMod
 			if (delta == null) {
 				delta = new ChatCompletionMessage("", Role.ASSISTANT);
 			}
-			return new ChatCompletion.Choice(cc.finishReason(), cc.index(), delta, cc.logprobs());
+			return new ChatCompletion.Choice(cc.finishReason(), cc.index(), delta, null, cc.logprobs());
 		}).toList();
 
 		return new ChatCompletion(chunk.id(), choices, chunk.created(), chunk.model(), chunk.systemFingerprint(),

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

@@ -160,6 +160,10 @@ public class MiniMaxApi {
 			this(Type.FUNCTION, function);
 		}
 
+		public static FunctionTool webSearchFunctionTool() {
+			return new FunctionTool(Type.WEB_SEARCH, null);
+		}
+
 		/**
 		 * Create a tool of type 'function' and the given function definition.
 		 */
@@ -167,7 +171,8 @@ public class MiniMaxApi {
 			/**
 			 * Function tool type.
 			 */
-			@JsonProperty("function") FUNCTION
+			@JsonProperty("function") FUNCTION,
+			@JsonProperty("web_search") WEB_SEARCH
 		}
 
 		/**
@@ -561,6 +566,7 @@ public class MiniMaxApi {
 				@JsonProperty("finish_reason") ChatCompletionFinishReason finishReason,
 				@JsonProperty("index") Integer index,
 				@JsonProperty("message") ChatCompletionMessage message,
+				@JsonProperty("messages") List<ChatCompletionMessage> messages,
 				@JsonProperty("logprobs") LogProbs logprobs) {
 		}
 

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

@@ -170,7 +170,23 @@ public class MiniMaxStreamFunctionCallingHelper {
 		if (choice == null || choice.delta() == null) {
 			return false;
 		}
-		return choice.finishReason() == ChatCompletionFinishReason.TOOL_CALLS;
+		return choice.finishReason() == MiniMaxApi.ChatCompletionFinishReason.TOOL_CALLS;
+	}
+
+	/**
+	 * Convert the ChatCompletionChunk into a ChatCompletion. The Usage is set to null.
+	 * @param chunk the ChatCompletionChunk to convert
+	 * @return the ChatCompletion
+	 */
+	public MiniMaxApi.ChatCompletion chunkToChatCompletion(MiniMaxApi.ChatCompletionChunk chunk) {
+		List<MiniMaxApi.ChatCompletion.Choice> choices = chunk.choices()
+			.stream()
+			.map(chunkChoice -> new MiniMaxApi.ChatCompletion.Choice(chunkChoice.finishReason(), chunkChoice.index(),
+					chunkChoice.delta(), null, chunkChoice.logprobs()))
+			.toList();
+
+		return new MiniMaxApi.ChatCompletion(chunk.id(), choices, chunk.created(), chunk.model(),
+				chunk.systemFingerprint(), "chat.completion", null, null);
 	}
 
 }

models/spring-ai-minimax/src/test/java/org/springframework/ai/minimax/api/MiniMaxApiToolFunctionCallIT.java

@@ -131,6 +131,33 @@ public class MiniMaxApiToolFunctionCallIT {
 			.containsAnyOf("°C", "Celsius");
 	}
 
+	@SuppressWarnings("null")
+	@Test
+	public void webSearchToolFunctionCall() {
+
+		var message = new ChatCompletionMessage(
+				"How many gold medals has the United States won in total at the 2024 Olympics?", Role.USER);
+
+		var functionTool = MiniMaxApi.FunctionTool.webSearchFunctionTool();
+
+		List<ChatCompletionMessage> messages = new ArrayList<>(List.of(message));
+
+		ChatCompletionRequest chatCompletionRequest = new ChatCompletionRequest(messages,
+				org.springframework.ai.minimax.api.MiniMaxApi.ChatModel.ABAB_6_5_S_Chat.getValue(),
+				List.of(functionTool), ToolChoiceBuilder.AUTO);
+
+		ResponseEntity<ChatCompletion> chatCompletion = miniMaxApi.chatCompletionEntity(chatCompletionRequest);
+
+		assertThat(chatCompletion.getBody()).isNotNull();
+		assertThat(chatCompletion.getBody().choices()).isNotEmpty();
+
+		List<ChatCompletionMessage> responseMessages = chatCompletion.getBody().choices().get(0).messages();
+		ChatCompletionMessage assistantMessage = responseMessages.get(responseMessages.size() - 1);
+
+		assertThat(assistantMessage.role()).isEqualTo(Role.ASSISTANT);
+		assertThat(assistantMessage.content()).contains("40");
+	}
+
 	private static <T> T fromJson(String json, Class<T> targetClass) {
 		try {
 			return new ObjectMapper().readValue(json, targetClass);

models/spring-ai-minimax/src/test/java/org/springframework/ai/minimax/api/MiniMaxRetryTests.java

@@ -102,7 +102,7 @@ public class MiniMaxRetryTests {
 	public void miniMaxChatTransientError() {
 
 		var choice = new ChatCompletion.Choice(ChatCompletionFinishReason.STOP, 0,
-				new ChatCompletionMessage("Response", Role.ASSISTANT), null);
+				new ChatCompletionMessage("Response", Role.ASSISTANT), null, null);
 		ChatCompletion expectedChatCompletion = new ChatCompletion("id", List.of(choice), 666l, "model", null, null,
 				null, new MiniMaxApi.Usage(10, 10, 10));