Combine prompt and config class into request class

- Stop maintaining defaults for request parameters
- remove extra serialised data from test

Author: rpanackal

foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/OpenAiChatCompletionConfig.java

@@ -0,0 +1,152 @@
+package com.sap.ai.sdk.foundationmodels.openai;
+
+import com.sap.ai.sdk.foundationmodels.openai.model2.ChatCompletionStreamOptions;
+import com.sap.ai.sdk.foundationmodels.openai.model2.ChatCompletionTool;
+import com.sap.ai.sdk.foundationmodels.openai.model2.ChatCompletionToolChoiceOption;
+import com.sap.ai.sdk.foundationmodels.openai.model2.CreateChatCompletionRequest;
+import com.sap.ai.sdk.foundationmodels.openai.model2.CreateChatCompletionRequestAllOfResponseFormat;
+import com.sap.ai.sdk.foundationmodels.openai.model2.CreateChatCompletionRequestAllOfStop;
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+/**
+ * Represents a request for OpenAI chat completion, including conversation messages and parameters.
+ */
+@Accessors(fluent = true)
+@Data
+public class OpenAiChatCompletionRequest {
+  /** List of messages from the conversation. */
+  @Nonnull private final List<OpenAiMessage> messages = new ArrayList<>();
+
+  /** Stop sequences for the completion. */
+  @Nullable private List<String> stop;
+
+  /** Temperature for the completion. */
+  @Nullable private BigDecimal temperature;
+
+  /** Top-p sampling parameter. */
+  @Nullable private BigDecimal topP;
+
+  /** Whether to stream the completion. */
+  @Nullable private Boolean stream;
+
+  /** Maximum number of tokens for the completion. */
+  @Nullable private Integer maxTokens;
+
+  /** Maximum number of tokens for the completion response. */
+  @Nullable private Integer maxCompletionTokens;
+
+  /** Presence penalty for the completion. */
+  @Nullable private BigDecimal presencePenalty;
+
+  /** Frequency penalty for the completion. */
+  @Nullable private BigDecimal frequencyPenalty;
+
+  /** Logit bias for the completion. */
+  @Nullable private Map<String, Integer> logitBias;
+
+  /** User identifier for the completion. */
+  @Nullable private String user;
+
+  /** Whether to include log probabilities in the response. */
+  @Nullable private Boolean logprobs;
+
+  /** Number of top log probabilities to include. */
+  @Nullable private Integer topLogprobs;
+
+  /** Number of completions to generate. */
+  @Nullable private Integer n;
+
+  /** Whether to allow parallel tool calls. */
+  @Nullable private Boolean parallelToolCalls;
+
+  /** Seed for random number generation. */
+  @Nullable private Integer seed;
+
+  /** Options for streaming the completion. */
+  @Nullable private ChatCompletionStreamOptions streamOptions;
+
+  /** Response format for the completion. */
+  @Nullable private CreateChatCompletionRequestAllOfResponseFormat responseFormat;
+
+  /** List of tools for the completion. */
+  @Nullable private List<ChatCompletionTool> tools;
+
+  /** Tool choice option for the completion. */
+  @Nullable private ChatCompletionToolChoiceOption toolChoice;
+
+  /**
+   * Creates an OpenAiChatCompletionPrompt with a single message.
+   *
+   * @param message the message to be added to the prompt
+   */
+  public OpenAiChatCompletionRequest(@Nonnull final String message) {
+    messages.add(OpenAiMessage.user(message));
+  }
+
+  /**
+   * Creates an OpenAiChatCompletionPrompt with a multiple unpacked messages.
+   *
+   * @param message the primary message to be added to the prompt
+   * @param messages additional messages to be added to the prompt
+   */
+  public OpenAiChatCompletionRequest(
+      @Nonnull final OpenAiMessage message, @Nonnull final OpenAiMessage... messages) {
+    this.messages.add(message);
+    this.messages.addAll(Arrays.asList(messages));
+  }
+
+  /**
+   * Sets the stop sequences for the prompt.
+   *
+   * @param values the stop sequences to be set
+   * @return the current OpenAiChatCompletionPrompt instance
+   */
+  @Nonnull
+  public OpenAiChatCompletionRequest stop(
+      @Nonnull final String value, @Nonnull final String... values) {
+    this.stop = new ArrayList<>();
+
+    this.stop.add(value);
+    this.stop.addAll(Arrays.asList(values));
+
+    return this;
+  }
+
+  CreateChatCompletionRequest toCreateChatCompletionRequest() {
+    final var request = new CreateChatCompletionRequest();
+    this.messages().forEach(message -> request.addMessagesItem(message.createDTO()));
+
+    request.stop(
+        this.stop() != null ? CreateChatCompletionRequestAllOfStop.create(this.stop()) : null);
+
+    request.temperature(this.temperature());
+    request.topP(this.topP());
+    request.stream(this.stream());
+    request.maxTokens(this.maxTokens());
+    request.maxCompletionTokens(this.maxCompletionTokens());
+    request.presencePenalty(this.presencePenalty());
+    request.frequencyPenalty(this.frequencyPenalty());
+    request.logitBias(this.logitBias());
+    request.user(this.user());
+    request.logprobs(this.logprobs());
+    request.topLogprobs(this.topLogprobs());
+    request.n(this.n());
+    request.parallelToolCalls(this.parallelToolCalls());
+    request.seed(this.seed());
+    request.streamOptions(this.streamOptions());
+    request.responseFormat(this.responseFormat());
+    request.tools(this.tools());
+    request.toolChoice(this.toolChoice());
+    request.functionCall(null);
+    request.functions(null);
+    return request;
+  }
+}

foundation-models/openai/src/main/java/com/sap/ai/sdk/foundationmodels/openai/OpenAiChatCompletionPrompt.java

@@ -14,7 +14,7 @@
 /** Represents the output of an OpenAI chat completion. */
 @Data
 @RequiredArgsConstructor(access = PROTECTED)
-public class OpenAiChatCompletionOutput {
+public class OpenAiChatCompletionResponse {
   /** The original response from the OpenAI API. */
   @Nonnull final CreateChatCompletionResponse originalResponse;