using System;
using OllamaSharp;
using System.Threading.Tasks;
using Microsoft.Extensions.AI;
using xAiApi.AI.Interfaces;
using xCommons.Extensions;
using xExceptions.Constants;
using xAiApi.AI.Configuration;
using System.Collections.Generic;
using System.Threading;
using Microsoft.SemanticKernel.ChatCompletion;

namespace xAiApi.AI.Services
{
    public class XAIService : IXAIService
    {
        /// <summary>
        /// Provides Options for Chat ...
        /// </summary>
        /// <value></value>
        public ChatOptions ChatOptions { get; }

        /// <summary>
        /// Provides History for Chat ... 
        /// </summary>
        /// <value></value>
        public ChatHistory ChatHistory { get; }

        /// <summary>
        /// a Client for Text Chat ...
        /// </summary>
        /// <value></value>
        public IChatClient TextGenreatorClient { get; }

        /// <summary>
        /// a Client for Code Chat ...
        /// </summary>
        /// <value></value>
        public IChatClient CodeGenreatorClient { get; }

        /// <summary>
        /// a Client for Image Chats ...
        /// </summary>
        /// <value></value>
        public IChatClient ImageGenreatorClient { get; }

        /// <summary>
        /// Configuration ...
        /// </summary>
        /// <value></value>
        public XAiApiConfiguration Configuration { get; }

        /// <summary>
        /// Constructing Service ...
        /// </summary>
        /// <param name="configuration">configuration ...</param>
        public XAIService(
            XAiApiConfiguration configuration
        )
        {
            //
            Configuration = configuration;

            //
            // here we are Initialize Text Generator Model ...
            TextGenreatorClient = new ChatClientBuilder(new OllamaApiClient(
                new Uri(configuration.Url),
                configuration.TextModel
            ))
            // .UseFunctionInvocation()
            .Build();

            //
            // Code Generator Client ...
            if (!configuration.CodeModel.IsNullOrEmpty())
            {
                //
                CodeGenreatorClient = new ChatClientBuilder(new OllamaApiClient(
                    new Uri(configuration.Url),
                    configuration.CodeModel
                ))
                // .UseFunctionInvocation()
                .Build();
            }

            //
            // Image Generator Client ...
            if (!configuration.ImageModel.IsNullOrEmpty())
            {
                //
                ImageGenreatorClient = new ChatClientBuilder(new OllamaApiClient(
                    new Uri(configuration.Url),
                    configuration.ImageModel
                ))
                // .UseFunctionInvocation()
                .Build();
            }

            //
            // Configuring Chant Options ...
            ChatOptions = new ChatOptions()
            {
                //
                // Preparing Tools ...
                // Tools = [
                //     //
                //     // Tempreature Tool ...
                //     AIFunctionFactory.Create((string location, string unit) => {
                //         //
                //         var temp = Random.Shared.Next(5, 20);
                //         var cond = Random.Shared.Next(0, 1) == 0 ? "sunny" : "rainy";

                //         //
                //         var result = $"The weather is {temp} degrees C and {cond}.";

                //         //
                //         return result;
                //     },
                //     "get_current_weather",
                //     "Get the current weather in given location"
                //     )
                // ],
            };
        }

        //
        #region Text Actions ...
        /// <summary>
        /// Generated Response ...
        /// </summary>
        /// <param name="prompt"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<ChatResponse> GetResponseAsync(
            string prompt,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Validate ...
            var isValid = !prompt.IsNullOrEmpty();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Preparing Prompt ...
            prompt = await PreparePrompt(
                prompt: prompt,
                cancellationToken: cancellationToken
            );

            //
            // Generate Response ...
            var result = await TextGenreatorClient
                .GetResponseAsync(
                    chatMessage: prompt, 
                    options: ChatOptions,
                    cancellationToken: cancellationToken
            );

            //
            return result;
        }

        /// <summary>
        /// Generated Text ...
        /// </summary>
        /// <param name="prompt"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task<string> GetTextResponseAsync(
            string prompt,
            CancellationToken cancellationToken = default
        )
        {
            //
            var response = await GetResponseAsync(
                prompt: prompt,
                cancellationToken: cancellationToken
            );

            //
            return response.Text;
        }

        /// <summary>
        /// Generate Text Response Stream ...
        /// </summary>
        /// <param name="prompt"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public IAsyncEnumerable<ChatResponseUpdate> GetTextReponseStreamAsync(
            string prompt,
            CancellationToken cancellationToken = default
        )
        {
            //
            // Validate ...
            var isValid = !prompt.IsNullOrEmpty();
            if (!isValid)
            {
                XException.InvalidArgs.Throw();
            }

            //
            // Preparing Prompt ...
            prompt = PreparePrompt(
                prompt: prompt,
                cancellationToken: cancellationToken
            )
            .RunTask();

            //
            // Generate Response ...
            var result = TextGenreatorClient
                .GetStreamingResponseAsync(
                    chatMessage: prompt,
                    options: ChatOptions,
                    cancellationToken: cancellationToken
            );

            //
            return result;
        }
        #endregion

        //
        #region Code Actions ...
        #endregion

        //
        #region Image Actions ...
        #endregion

        //
        #region Private ...
        /// <summary>
        /// Preparing Prompt for AI ...
        /// </summary>
        /// <param name="prompt"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        private async Task<string> PreparePrompt(
            string prompt,
            CancellationToken cancellationToken = default
        )
        {
            //
            return await Task.FromResult(prompt);
        }
        #endregion
    }
}