var configuration = new ConfigurationBuilder()
    .AddUserSecrets<Program>()
    .Build();

var apiKey = configuration["OpenAI:ApiKey"]!;

var fileClient = new OpenAIFileClient(apiKey);
OpenAIFile openAIFileInfo = await fileClient.UploadFileAsync("employees.pdf", FileUploadPurpose.Assistants);

// Upload a file to the specified provider.
var fileId = openAIFileInfo.Id;

// Create a vector store for the uploaded file to enable file search capabilities.
var vectorStoreClient = new VectorStoreClient(apiKey);
VectorStoreCreationOptions vectorOptions = new();
vectorOptions.FileIds.Add(fileId);

var vectorStore = await vectorStoreClient.CreateVectorStoreAsync(waitUntilCompleted: true, vectorOptions);

// Create a file search tool that can access the vector store.
var fileSearchTool = new HostedFileSearchTool()
{
    Inputs = [new HostedVectorStoreContent(vectorStore.Value!.Id)],
};

ChatOptions chatOptions = new() { Tools = [fileSearchTool] };

var assistantClient = new AssistantClient(apiKey);
Assistant assistant = await assistantClient.CreateAssistantAsync("gpt-4o-mini", new AssistantCreationOptions()
{
    Name = "FileSearchAssistant",
    Instructions = "You are a helpful assistant that can search through uploaded documents to answer questions. Use the file search tool to find relevant information from the uploaded files.",
});

using var chatClient = new AssistantClient(apiKey).AsIChatClient(assistant.Id);

const string Prompt = "Who is the youngest employee?";

await foreach (var update in chatClient.GetStreamingResponseAsync(Prompt, chatOptions))
{
    Console.Write(update);
}

await assistantClient.DeleteAssistantAsync(assistant.Id);