using Qdp.Pricing.Base.Enums;
using Qdp.Pricing.Library.Common.Interfaces;
using Qdp.Pricing.Library.Options.MonteCarlo;
using Qdp.Pricing.Library.Options.Products.Autocall.Phoenix.Numerical;

namespace YLErp.BLL.Calculation.Engine
{
    class AutoCallEngineFactory : OptionEngineFactoryBase
    {
        public static AutoCallEngineFactory Instance
        {
            get
            {
                if (_instance == null)
                {
                    _instance = new AutoCallEngineFactory();
                }
                return _instance;
            }
        }
        protected AutoCallEngineFactory() { }
        protected static AutoCallEngineFactory _instance;

        public override IEngine GetEngine(
            string engineName = null,
            OptionExercise exercise = OptionExercise.European,
            params object[] additionalParams)
        {
            if (string.IsNullOrWhiteSpace(engineName))
            {
                return DefaultEngine(additionalParams);
            }
            else if (engineName.ToUpper() == "GBMMONTECARLOENGINE")
            {
                return new GbmMonteCarloEngine(100000, 1e-3, 1e-6, 1);
            }
            else if (engineName.IsValidEngineName())
            {
                return OptionEngineRepository.CreateEngine(engineName);
            }
            else
            {
                throw new Exception($"无法创建计算引擎{engineName}");
            }
        }

        private IEngine DefaultEngine(params object[] additionalParams)
        {
            var quadratureFastMode = false;
            if (additionalParams.Length > 0)
            {
                quadratureFastMode = (bool)additionalParams[0];
            }

            if (quadratureFastMode)
            {
                return new QuadAutoCallEngine(parallelDegree: Environment.ProcessorCount);
            }
            else
            {
                return new QuadAutoCallEngine(parallelDegree: PS.Config.ErpElement.QdpParallelDegree);
            }
        }
    }
}