ChatCheap/ChatServerSpace/Services/ServerSpaceChatService.cs

using ChatServerSpace.Models;
using Microsoft.AspNetCore.DataProtection.KeyManagement;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;

namespace ChatServerSpace.Services
{
    public class ServerSpaceChatService : IChatService
    {
        private readonly IChatHistoryService _historyService;
        private readonly Kernel _kernel;
        private readonly ILogger<ServerSpaceChatService> _logger;

        public ServerSpaceChatService(IChatHistoryService historyService, IConfiguration config, ILogger<ServerSpaceChatService> logger, HttpClient httpClient)
        {
            _historyService = historyService;
            _logger = logger;

            var apiKey = config["ChatServer:ApiKey"] ?? throw new ArgumentNullException("ServeSpace:ApiKey configuration is missing");
            var modelId = config["ChatServer:ModelId"] ?? "anthropic/claude-3.7-sonnet";
            var endpoint = config["ChatServer:Url"] ?? "https://api.deepinfra.com/v1/openai/chat/completions";


            _kernel = Kernel.CreateBuilder()
                .AddOpenAIChatCompletion(modelId, new Uri(endpoint), apiKey)
                .Build();
        }

        public async Task<ChatResponse> ProcessMessageAsync(ChatRequest request)
        {
            try
            {
                // Save user message to history
                var userMessage = new ChatMessage
                {

                    SessionId = request.SessionId,
                    Role = "user",
                    Content = request.Message
                };
                await _historyService.SaveMessageAsync(userMessage);

                // Get chat history
                var history = await _historyService.GetSessionHistoryAsync(request.SessionId);

                // Create chat history for Semantic Kernel
                var chatHistory = new Microsoft.SemanticKernel.ChatCompletion.ChatHistory();

                foreach (var message in history)
                {
                    if (message.Role.Equals("user", StringComparison.OrdinalIgnoreCase))
                    {
                        chatHistory.AddUserMessage(message.Content);
                    }
                    else if (message.Role.Equals("assistant", StringComparison.OrdinalIgnoreCase))
                    {
                        chatHistory.AddAssistantMessage(message.Content);
                    }
                }

                try
                {
                    // Get response from Gemini
                    var chatCompletionService = _kernel.GetRequiredService<IChatCompletionService>();

                    var exec = new PromptExecutionSettings
                    {
                        ExtensionData = new Dictionary<string, object>
                        {
                            { "maxOutputTokens", 8192 },
                            { "temperature", 0.8 },
                            { "topP", 0.95 },
                            //{ "stopSequences", new List<string>() }
                        }
                    };
                    var result = await chatCompletionService.GetChatMessageContentAsync(chatHistory, exec);
                    var responseText = result.ToString();

                    // Save assistant message to history
                    var assistantMessage = new ChatMessage
                    {
                        SessionId = request.SessionId,
                        Role = "assistant",
                        Content = responseText
                    };
                    await _historyService.SaveMessageAsync(assistantMessage);

                    await Task.Delay(2000);

                    return new ChatResponse
                    {
                        SessionId = request.SessionId,
                        Response = responseText
                    };
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Error getting response from Gemini");
                    throw;
                }
            }
            catch (Exception ex)
            {
                throw new Exception("Erro na parada!", ex);
            }
        }

        private class ServerSpaceResponse
        {
            public List<ServerSpaceChoice>? Choices { get; set; }
        }

        private class ServerSpaceChoice
        {
            public ServerSpaceMessage? Message { get; set; }
        }

        private class ServerSpaceMessage
        {
            public string? Content { get; set; }
        }
    }
}