using ChatApi.Data;
using ChatRAG.Contracts.VectorSearch;
using ChatRAG.Data;
using ChatRAG.Services.Contracts;
using ChatRAG.Services.ResponseService;
using ChatRAG.Services.TextServices;
using ChatRAG.Settings.ChatRAG.Configuration;
using Microsoft.Extensions.Options;

namespace ChatRAG.Services.SearchVectors
{
    public class VectorDatabaseFactory : IVectorDatabaseFactory
    {
        private readonly IServiceProvider _serviceProvider;
        private readonly VectorDatabaseSettings _settings;
        private readonly ILogger<VectorDatabaseFactory> _logger;

        public VectorDatabaseFactory(
            IServiceProvider serviceProvider,
            IOptions<VectorDatabaseSettings> settings,
            ILogger<VectorDatabaseFactory> logger)
        {
            _serviceProvider = serviceProvider;
            _settings = settings.Value;
            _logger = logger;
        }

        public string GetActiveProvider()
        {
            return _settings.Provider;
        }

        public VectorDatabaseSettings GetSettings()
        {
            return _settings;
        }

        public IVectorSearchService CreateVectorSearchService()
        {
            _logger.LogInformation("Criando VectorSearchService para provider: {Provider}", _settings.Provider);

            return _settings.Provider.ToLower() switch
            {
                "qdrant" => GetService<QdrantVectorSearchService>(),
                "mongodb" => GetService<MongoVectorSearchService>(),
                "chroma" => GetService<ChromaVectorSearchService>(),
                _ => throw new ArgumentException($"Provider de VectorSearch não suportado: {_settings.Provider}")
            };
        }

        public ITextDataService CreateTextDataService()
        {
            _logger.LogInformation("Criando TextDataService para provider: {Provider}", _settings.Provider);

            return _settings.Provider.ToLower() switch
            {
                "qdrant" => GetService<QdrantTextDataService>(),
                "mongodb" => GetService<MongoTextDataService>(),
                "chroma" => GetService<ChromaTextDataService>(),
                _ => throw new ArgumentException($"Provider de TextDataService não suportado: {_settings.Provider}")
            };
        }

        public IResponseService CreateResponseService()
        {
            _logger.LogInformation("Criando ResponseService para provider: {Provider}", _settings.Provider);

            // Verificar se deve usar RAG Hierárquico
            var configuration = _serviceProvider.GetService<IConfiguration>();
            var useHierarchical = configuration?.GetValue<bool>("Features:UseHierarchicalRAG") ?? false;
            var useConfidenceAware = configuration?.GetValue<bool>("Features:UseConfidenceAwareRAG") ?? false;

            if (useHierarchical && !useConfidenceAware)
            {
                _logger.LogInformation("Usando HierarchicalRAGService");
                return GetService<HierarchicalRAGService>();
            }
            
            if (useConfidenceAware)
            {
                _logger.LogInformation("Usando ConfidenceAwareRAGService");
                return GetService<ConfidenceAwareRAGService>();
            }

            // Usar estratégia baseada no provider ou configuração
            var ragStrategy = configuration?.GetValue<string>("Features:RAGStrategy");

            return ragStrategy?.ToLower() switch
            {
                "hierarchical" => GetService<HierarchicalRAGService>(),
                "standard" => GetService<ResponseRAGService>(),
                _ => GetService<ResponseRAGService>() // Padrão
            };
        }

        private T GetService<T>() where T : class
        {
            var service = _serviceProvider.GetService<T>();
            if (service == null)
            {
                throw new InvalidOperationException($"Serviço {typeof(T).Name} não está registrado no DI container. " +
                    $"Verifique se o serviço foi registrado para o provider '{_settings.Provider}'.");
            }
            return service;
        }
    }
}