OllamaStudy/OllamaStudy.CApp/Program.cs

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text.Json.Serialization;

using System.Text;
using System.Text.Json;

namespace OllamaStudy.CApp
{


    class Program
    {
        private static readonly HttpClient httpClient = new HttpClient();

        static async Task Main()
        {
            string model = "llama3.2:1b";
            string prompt = "What is the weather in Toronto?";
            var functionDefinition = new
            {
                name = "get_current_weather",
                description = "Get the current weather for a city.",
                parameters = new
                {
                    type = "object",
                    properties = new { city = new { type = "string", description = "The name of the city" } },
                    required = new[] { "city" }
                }
            };

            var requestBody = new
            {
                model = model,
                messages = new[] { new { role = "user", content = prompt } },
                tools = new[] { new { type = "function", function = functionDefinition } },
                stream = false
            };

            string jsonRequest = JsonSerializer.Serialize(requestBody);
            var request = new HttpRequestMessage
            {
                Method = HttpMethod.Post,
                RequestUri = new Uri("http://localhost:11434/api/chat"),
                Content = new StringContent(jsonRequest, Encoding.UTF8, "application/json")
            };

            try
            {
                HttpResponseMessage response = await httpClient.SendAsync(request);
                string responseContent = await response.Content.ReadAsStringAsync();
                Console.WriteLine("🔹 Response from model:");
                Console.WriteLine(responseContent);

                var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
                var jsonResponse = JsonSerializer.Deserialize<OllamaResponse>(responseContent, options);

                if (jsonResponse?.Message?.ToolCalls != null && jsonResponse.Message.ToolCalls.Length > 0)
                {
                    foreach (var toolCall in jsonResponse.Message.ToolCalls)
                    {
                        if (toolCall.Function?.Name == "get_current_weather")
                        {
                            string city = toolCall.Function.Arguments?.City ?? "unknown";
                            Console.WriteLine($"🌦️ Calling get_current_weather with city: {city}");
                            string weatherInfo = GetCurrentWeather(city);
                            Console.WriteLine($"✅ Weather in {city}: {weatherInfo}");
                        }
                    }
                }
                else
                {
                    Console.WriteLine("⚠️ No tool calls detected.");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"❌ Error connecting to Ollama: {ex.Message}");
            }
        }

        static string GetCurrentWeather(string city)
        {
            return $"The weather in {city} is sunny with 25°C.";
        }
    }

    class OllamaResponse
    {
        [JsonPropertyName("message")]
        public MessageContent? Message { get; set; }
    }

    class MessageContent
    {
        [JsonPropertyName("tool_calls")]
        public ToolCall[]? ToolCalls { get; set; }
    }

    class ToolCall
    {
        [JsonPropertyName("function")]
        public FunctionData? Function { get; set; }
    }

    class FunctionData
    {
        [JsonPropertyName("name")]
        public string? Name { get; set; }

        [JsonPropertyName("arguments")]
        public ToolArguments? Arguments { get; set; }
    }

    class ToolArguments
    {
        [JsonPropertyName("city")]
        public string? City { get; set; }
    }
}