fix(chat): function call nullable name/arguments

openai-core/src/commonMain/kotlin/com.aallam.openai.api/chat/FunctionCall.kt

@@ -6,29 +6,54 @@ import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
 
 /**
- * The name and arguments of a function that should be called, as generated by the model.
+ * Represents a function invocation with its name and serialized arguments as generated by the model.
+ *
+ * In scenarios such as a streaming variant of the chat API, both [nameOrNull] and [argumentsOrNull] can be null.
  */
 @Serializable
 public data class FunctionCall(
     /**
      * The name of the function to call.
      */
-    @SerialName("name") val name: String,
+    @SerialName("name") val nameOrNull: String? = null,
 
     /**
      * The arguments to call the function with, as generated by the model in JSON format.
      * Note that the model does not always generate valid JSON, and may hallucinate parameters
      * not defined by your function schema.
      * Validate the arguments in your code before calling your function.
      */
-    @SerialName("arguments") val arguments: String,
+    @SerialName("arguments") val argumentsOrNull: String? = null,
 ) {
 
+    /**
+     * The name of the function to call.
+     */
+    public val name: String
+        get() = requireNotNull(nameOrNull)
+
+    /**
+     * The arguments to call the function with, as generated by the model in JSON format.
+     * Note that the model does not always generate valid JSON, and may hallucinate parameters
+     * not defined by your function schema.
+     * Validate the arguments in your code before calling your function.
+     */
+    public val arguments: String
+        get() = requireNotNull(argumentsOrNull)
+
     /**
      * Decodes the [arguments] JSON string into a JsonObject.
      * If [arguments] is null, the function will return null.
      *
      * @param json The Json object to be used for decoding, defaults to a default Json instance
      */
     public fun argumentsAsJson(json: Json = Json): JsonObject = json.decodeFromString(arguments)
+
+    /**
+     * Decodes the [arguments] JSON string into a JsonObject.
+     * If [arguments] is null, the function will return null.
+     *
+     * @param json The Json object to be used for decoding, defaults to a default Json instance
+     */
+    public fun argumentsAsJsonOrNull(json: Json = Json): JsonObject? = argumentsOrNull?.let { json.decodeFromString(it) }
 }

sample/jvm/src/main/kotlin/com/aallam/openai/sample/jvm/Chat.kt

@@ -1,18 +1,15 @@
 package com.aallam.openai.sample.jvm
 
-import com.aallam.openai.api.BetaOpenAI
 import com.aallam.openai.api.chat.ChatCompletionRequest
 import com.aallam.openai.api.chat.ChatMessage
 import com.aallam.openai.api.chat.ChatRole
 import com.aallam.openai.api.model.ModelId
 import com.aallam.openai.client.OpenAI
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.onCompletion
 import kotlinx.coroutines.flow.onEach
 
-@OptIn(BetaOpenAI::class)
-suspend fun CoroutineScope.chat(openAI: OpenAI) {
+suspend fun chat(openAI: OpenAI) {
     println("\n> Create chat completions...")
     val chatCompletionRequest = ChatCompletionRequest(
         model = ModelId("gpt-3.5-turbo"),
@@ -33,6 +30,5 @@ suspend fun CoroutineScope.chat(openAI: OpenAI) {
     openAI.chatCompletions(chatCompletionRequest)
         .onEach { print(it.choices.first().delta.content.orEmpty()) }
         .onCompletion { println() }
-        .launchIn(this)
-        .join()
+        .collect()
 }

sample/jvm/src/main/kotlin/com/aallam/openai/sample/jvm/ChatFunctionCall.kt

@@ -1,19 +1,16 @@
 package com.aallam.openai.sample.jvm
 
-import com.aallam.openai.api.BetaOpenAI
 import com.aallam.openai.api.chat.*
 import com.aallam.openai.api.model.ModelId
 import com.aallam.openai.client.OpenAI
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.onCompletion
 import kotlinx.coroutines.flow.onEach
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.*
 
-@OptIn(BetaOpenAI::class)
-suspend fun CoroutineScope.chatFunctionCall(openAI: OpenAI) {
+suspend fun chatFunctionCall(openAI: OpenAI) {
     // *** Chat Completion with Function Call  *** //
 
     println("\n> Create Chat Completion function call...")
@@ -84,8 +81,7 @@ suspend fun CoroutineScope.chatFunctionCall(openAI: OpenAI) {
                 updateChatMessages(chatMessages, message, it, functionResponse)
             }
         }
-        .launchIn(this)
-        .join()
+        .collect()
 
     openAI.chatCompletions(
         ChatCompletionRequest(
@@ -95,8 +91,7 @@ suspend fun CoroutineScope.chatFunctionCall(openAI: OpenAI) {
     )
         .onEach { print(it.choices.first().delta.content.orEmpty()) }
         .onCompletion { println() }
-        .launchIn(this)
-        .join()
+        .collect()
 }
 
 @Serializable

sample/jvm/src/main/kotlin/com/aallam/openai/sample/jvm/Whisper.kt

@@ -1,6 +1,5 @@
 package com.aallam.openai.sample.jvm
 
-import com.aallam.openai.api.BetaOpenAI
 import com.aallam.openai.api.audio.TranscriptionRequest
 import com.aallam.openai.api.audio.TranslationRequest
 import com.aallam.openai.api.file.FileSource
@@ -9,7 +8,6 @@ import com.aallam.openai.client.OpenAI
 import okio.FileSystem
 import okio.Path.Companion.toPath
 
-@OptIn(BetaOpenAI::class)
 suspend fun whisper(openAI: OpenAI) {
     println("\n>️ Create transcription...")
     val transcriptionRequest = TranscriptionRequest(

sample/jvm/src/main/kotlin/com/aallam/openai/sample/jvm/images.kt

@@ -1,6 +1,5 @@
 package com.aallam.openai.sample.jvm
 
-import com.aallam.openai.api.BetaOpenAI
 import com.aallam.openai.api.file.FileSource
 import com.aallam.openai.api.image.ImageCreation
 import com.aallam.openai.api.image.ImageEdit
@@ -9,7 +8,6 @@ import com.aallam.openai.client.OpenAI
 import okio.FileSystem
 import okio.Path.Companion.toPath
 
-@OptIn(BetaOpenAI::class)
 suspend fun images(openAI: OpenAI) {
     println("\n> Create images...")
     val images = openAI.imageURL(