Program.cs

// NovaPAI C# SDK Example
// Install: dotnet add package OpenAI
// Docs: https://novapai.ai

using OpenAI;
using OpenAI.Chat;
using System.ClientModel;
using System.Text.Json;

// ── Setup Client ────────────────────────────────────────────
var options = new OpenAIClientOptions
{
    Endpoint = new Uri("https://api.novapai.ai/router/v1")
};
var client = new ChatClient(
    model: "deepseek-v4-pro",
    credential: new ApiKeyCredential("your-api-key"),
    options: options
);

// ── Basic Chat ──────────────────────────────────────────────
async Task BasicChat()
{
    var messages = new List<ChatMessage>
    {
        new SystemChatMessage("You are a helpful assistant."),
        new UserChatMessage("Hello!")
    };

    ChatCompletion response = await client.CompleteChatAsync(messages);
    Console.WriteLine(response.Content[0].Text);
}

// ── Streaming ───────────────────────────────────────────────
async Task StreamChat()
{
    var messages = new List<ChatMessage>
    {
        new UserChatMessage("Tell me a joke")
    };

    await foreach (StreamingChatCompletionUpdate chunk in
        client.CompleteChatStreamingAsync(messages))
    {
        foreach (var part in chunk.ContentUpdate)
            Console.Write(part.Text);
    }
    Console.WriteLine();
}

// ── Multi-turn Conversation ─────────────────────────────────
async Task MultiTurnChat()
{
    var messages = new List<ChatMessage>
    {
        new SystemChatMessage("You are a helpful assistant.")
    };

    async Task<string> Chat(string userInput)
    {
        messages.Add(new UserChatMessage(userInput));
        var response = await client.CompleteChatAsync(messages);
        var reply = response.Content[0].Text;
        messages.Add(new AssistantChatMessage(reply));
        return reply;
    }

    Console.WriteLine(await Chat("What is 1+1?"));
    Console.WriteLine(await Chat("Multiply that by 10"));
}

// ── Function Calling ────────────────────────────────────────
async Task FunctionCalling()
{
    var getWeatherTool = ChatTool.CreateFunctionTool(
        "get_weather",
        "Get current weather for a city",
        BinaryData.FromString("""
        {
            "type": "object",
            "properties": {
                "city": { "type": "string", "description": "City name" }
            },
            "required": ["city"]
        }
        """)
    );

    var chatOptions = new ChatCompletionOptions();
    chatOptions.Tools.Add(getWeatherTool);

    List<ChatMessage> messages = [new UserChatMessage("What's the weather in Tokyo?")];
    ChatCompletion response = await client.CompleteChatAsync(messages, chatOptions);

    var toolCall = response.ToolCalls[0];
    Console.WriteLine($"Function: {toolCall.FunctionName}");
    Console.WriteLine($"Args: {toolCall.FunctionArguments}");
}

// ── JSON Mode (Structured Output) ───────────────────────────
async Task JsonMode()
{
    var chatOptions = new ChatCompletionOptions
    {
        ResponseFormat = ChatResponseFormat.CreateJsonObjectFormat()
    };

    List<ChatMessage> messages = [
        new SystemChatMessage("Extract company info as JSON."),
        new UserChatMessage("Apple Inc. is based in Cupertino, founded in 1976.")
    ];

    ChatCompletion response = await client.CompleteChatAsync(messages, chatOptions);
    Console.WriteLine(response.Content[0].Text);
}

await BasicChat();
await StreamChat();
await MultiTurnChat();
await FunctionCalling();
await JsonMode();