using ChatApi.Models;
using ChatRAG.Contracts.VectorSearch;
using ChatRAG.Models;
using ChatRAG.Services.Contracts;
using Microsoft.SemanticKernel.Embeddings;

#pragma warning disable SKEXP0001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
namespace ChatRAG.Services.ResponseService
{
    public class MongoResponseService : IResponseService
    {
        private readonly ResponseRAGService _originalService; // Sua classe atual!
        private readonly IVectorSearchService _vectorSearchService;
        private readonly ITextEmbeddingGenerationService _embeddingService;
        private readonly TextFilter _textFilter;

        public MongoResponseService(
            ResponseRAGService originalService,
            IVectorSearchService vectorSearchService,
            ITextEmbeddingGenerationService embeddingService,
            TextFilter textFilter)
        {
            _originalService = originalService;
            _vectorSearchService = vectorSearchService;
            _embeddingService = embeddingService;
            _textFilter = textFilter;
        }

        public string ProviderName => "MongoDB";

        // ========================================
        // MÉTODO ORIGINAL - Delega para ResponseRAGService
        // ========================================
        public async Task<string> GetResponse(UserData userData, string projectId, string sessionId, string question)
        {
            return await _originalService.GetResponse(userData, projectId, sessionId, question);
        }

        // ========================================
        // MÉTODO ESTENDIDO COM MAIS DETALHES
        // ========================================
        public async Task<ResponseResult> GetResponseDetailed(
            UserData userData,
            string projectId,
            string sessionId,
            string question,
            ResponseOptions? options = null)
        {
            options ??= new ResponseOptions();
            var stopwatch = System.Diagnostics.Stopwatch.StartNew();

            // Gera embedding da pergunta
            var embeddingPergunta = await _embeddingService.GenerateEmbeddingAsync(
                _textFilter.ToLowerAndWithoutAccents(question));
            var embeddingArray = embeddingPergunta.ToArray().Select(e => (double)e).ToArray();

            var searchStart = stopwatch.ElapsedMilliseconds;

            // Busca documentos similares usando a interface
            var documentos = await _vectorSearchService.SearchSimilarDynamicAsync(
                embeddingArray,
                projectId,
                options.SimilarityThreshold,
                options.MaxContextDocuments);

            var searchTime = stopwatch.ElapsedMilliseconds - searchStart;
            var llmStart = stopwatch.ElapsedMilliseconds;

            // Chama o método original para gerar resposta
            var response = await _originalService.GetResponse(userData, projectId, sessionId, question);

            var llmTime = stopwatch.ElapsedMilliseconds - llmStart;
            stopwatch.Stop();

            // Monta resultado detalhado
            return new ResponseResult
            {
                Content = response,
                Provider = "MongoDB",
                Sources = documentos.Select(d => new SourceDocument
                {
                    Id = d.Id,
                    Title = d.Title,
                    Content = d.Content,
                    Similarity = d.Score,
                    Metadata = d.Metadata
                }).ToList(),
                Metrics = new ResponseMetrics
                {
                    TotalTimeMs = stopwatch.ElapsedMilliseconds,
                    SearchTimeMs = searchTime,
                    LlmTimeMs = llmTime,
                    DocumentsFound = documentos.Count,
                    DocumentsUsed = documentos.Count,
                    AverageSimilarity = documentos.Any() ? documentos.Average(d => d.Score) : 0
                }
            };
        }

        public async Task<ResponseStats> GetStatsAsync()
        {
            // Implementação básica - pode ser expandida
            return new ResponseStats
            {
                TotalRequests = 0,
                AverageResponseTime = 0,
                RequestsByProject = new Dictionary<string, int>(),
                LastRequest = DateTime.UtcNow
            };
        }
    }
}
#pragma warning restore SKEXP0001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.