#region imports
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Linq;
    using System.Globalization;
    using System.Drawing;
    using QuantConnect;
    using QuantConnect.Algorithm.Framework;
    using QuantConnect.Algorithm.Framework.Selection;
    using QuantConnect.Algorithm.Framework.Alphas;
    using QuantConnect.Algorithm.Framework.Portfolio;
    using QuantConnect.Algorithm.Framework.Execution;
    using QuantConnect.Algorithm.Framework.Risk;
    using QuantConnect.Algorithm.Selection;
    using QuantConnect.Parameters;
    using QuantConnect.Benchmarks;
    using QuantConnect.Brokerages;
    using QuantConnect.Util;
    using QuantConnect.Interfaces;
    using QuantConnect.Algorithm;
    using QuantConnect.Indicators;
    using QuantConnect.Data;
    using QuantConnect.Data.Consolidators;
    using QuantConnect.Data.Custom;
    using QuantConnect.DataSource;
    using QuantConnect.Data.Fundamental;
    using QuantConnect.Data.Market;
    using QuantConnect.Data.UniverseSelection;
    using QuantConnect.Notifications;
    using QuantConnect.Orders;
    using QuantConnect.Orders.Fees;
    using QuantConnect.Orders.Fills;
    using QuantConnect.Orders.Slippage;
    using QuantConnect.Scheduling;
    using QuantConnect.Securities;
    using QuantConnect.Securities.Equity;
    using QuantConnect.Securities.Future;
    using QuantConnect.Securities.Option;
    using QuantConnect.Securities.Forex;
    using QuantConnect.Securities.Crypto;   
    using QuantConnect.Securities.Interfaces;
    using QuantConnect.Storage;
    using QCAlgorithmFramework = QuantConnect.Algorithm.QCAlgorithm;
    using QCAlgorithmFrameworkBridge = QuantConnect.Algorithm.QCAlgorithm;
#endregion

using QuantConnect.Lean.Engine.DataFeeds.WorkScheduling;

namespace QuantConnect.Algorithm.CSharp
{
    public class EmptyEquityAndOptions400Benchmark : QCAlgorithm
    {
        private int _selections;
        private long _accumulatorTotal;
        private long _accumulator;

        public override void Initialize()
        {
            const int underlyings = 80;
            const int toSelect = 0;
            // var version = Globals.Version.EndsWithInvariant("97") ? "Master" : "Branch";

            SetName($"v{Globals.Version.Split('.')[^1]} - {underlyings} underlyings - {toSelect} selected");

            UniverseSettings.Asynchronous = true;

            SetStartDate(2007, 01, 01);
            // SetEndDate(2016, 01, 01);

            var equity_symbols = new[] {

                "SPY",

// "MARK", "TSN", "DT", "RDW", "CVE", "NXPI", "FIVN", "CLX", "SPXL", "BKSY", "NUGT", "CF", "NEGG",
// "RH", "SIRI", "ITUB", "CSX", "AUR", "LIDR", "CMPS", "DHI", "GLW", "NTES", "CIFR", "S", "HSBC",
// "HIPO", "WTRH", "AMRN", "BIIB", "RIO", "EDIT", "TEAM", "CNK", "BUD", "MILE", "AEHR", "DOCN",
// "CLSK", "BROS", "MLCO", "SBLK", "ICLN", "OPK", "CNC", "SKX", "SESN", "VRM", "ASML", "BBAI",
// "HON", "MRIN", "BLMN", "NTNX", "POWW", "FOUR", "HOG", "GOGO", "MGNI", "GENI", "XPDI",
// "DG", "PSX", "RRC", "CORT", "MET", "UMC", "INMD", "RBAC", "ISRG", "BOX", "DVAX", "CRVS", "HLT",
// "BKNG", "BENE", "CLVS", "ESSC", "PTRA", "BE", "FPAC", "YETI", "DOCS", "DB", "EBON", "RDS.B",
// "ERIC", "BSIG", "INTU", "MNTS", "BCTX", "BLU", "FIS", "MAC", "WMB", "TTWO", "ARDX", "SWBI",
// "ELY", "INDA", "REAL", "ACI", "APRN", "BHP", "CPB", "SLQT", "ARKF", "TSP", "OKE", "NVTA", "META",
// "CSTM", "KMX", "IBB", "AGEN", "WOOF", "MJ", "HYZN", "RSI", "JCI", "EXC", "HPE", "SI", "WPM",
// "PRTY", "BBD", "FVRR", "CANO", "INDI", "MDLZ", "KOLD", "AMBA", "SOXS", "RSX", "ZEN", "PUBM",
// "VLDR", "CI", "ISEE", "GEO", "BKR", "DHR", "GRPN", "NRXP", "ACN", "MAT", "BODY", "ENDP",
// "SHPW", "AVIR", "GPN", "BILL", "BZ", "CERN", "ARVL", "DNMR", "NTR", "FSM", "BMBL", "PAAS",
// "INVZ", "ANF", "CL", "XP", "CS", "KD", "WW", "AHT", "GRTX", "XLC", "BLDP", "HTA", "APT", "BYSI",
// "ENB", "TRIT", "VTNR", "AVCT", "SLI", "CP", "CAH", "ALLY", "FIGS", "PXD", "TPX", "ZI", "BKLN", "SKIN",
// "LNG", "NU", "CX", "GSM", "NXE", "REI", "MNDT", "IP", "BLOK", "IAA", "TIP", "MCHP", "EVTL", "BIGC",
// "IGV", "LOTZ", "EWC", "DRI", "PSTG", "APLS", "KIND", "BBIO", "APPH", "FIVE", "LSPD", "SHAK",
// "COMM", "NAT", "VFC", "AMT", "VRTX", "RGS", "DD", "GBIL", "LICY", "ACHR", "FLR", "HGEN", "TECL",
// "SEAC", "NVS", "NTAP", "ML", "SBSW", "XRX", "UA", "NNOX", "SFT", "FE", "APP", "KEY", "CDEV",
// "DPZ", "BARK", "SPR", "CNQ", "XL", "AXSM", "ECH", "RNG", "AMLP", "ENG", "BTI", "REKR",
// "STZ", "BK", "HEAR", "LEV", "SKT", "HBI", "ALB", "CAG", "MNKD", "NMM", "BIRD", "CIEN", "SILJ",
// "STNG", "GUSH", "GIS", "PRPL", "SDOW", "GNRC", "ERX", "GES", "CPE", "FBRX", "WM", "ESTC",
// "GOED", "STLD", "LILM", "JNK", "BOIL", "ALZN", "IRBT", "KOPN", "AU", "TPR", "RWLK", "TROX",
// "TMO", "AVDL", "XSPA", "JKS", "PACB", "LOGI", "BLK", "REGN", "CFVI", "EGHT", "ATNF", "PRU",
// "URBN", "KMB", "SIX", "CME", "ENVX", "NVTS", "CELH", "CSIQ", "GSL", "PAA", "WU", "MOMO",
// "TOL", "WEN", "GTE", "EXAS", "GDRX", "PVH", "BFLY", "SRTY", "UDOW", "NCR", "ALTO", "CRTD",
// "GOCO", "ALK", "TTM", "DFS", "VFF", "ANTM", "FREY", "WY", "ACWI", "PNC", "SYY", "SNY", "CRK",
// "SO", "XXII", "PBF", "AER", "RKLY", "SOL", "CND", "MPLX", "JNPR", "FTCV", "CLR", "XHB", "YY",
// "POSH", "HIMS", "LIFE", "XENE", "ADM", "ROST", "MIR", "NRG", "AAP", "SSYS", "KBH", "KKR", "PLAN",
// "DUK", "WIMI", "DBRG", "WSM", "LTHM", "OVV", "CFLT", "EWT", "UNFI", "TX", "EMR", "IMGN", "K",
// "ONON", "UNIT", "LEVI", "ADTX", "UPWK", "DBA", "VOO", "FATH", "URI", "MPW", "JNUG", "RDFN",
// "OSCR", "WOLF", "SYF", "GOGL", "HES", "PHM", "CWEB", "ALDX", "BTWN", "AFL", "PPL", "CIM"

            };
            
            foreach(var ticker in equity_symbols.Take(underlyings))
            {
                var option = AddOption(ticker, Resolution.Daily);
                option.SetFilter(u => 
                {
                    return u.Contracts(x => x.Take(toSelect));
                    // return u;
                });
            }

            AddEquity("SPY", Resolution.Daily);

            var chart = new Chart("Memory usage"); 
            AddChart(chart);
            chart.AddSeries(new Series("Memory", SeriesType.Line));


            // var chart2 = new Chart("Active Securities"); 
            // AddChart(chart2);
            // chart2.AddSeries(new Series("Count", SeriesType.Line));

            Schedule.On(DateRules.MonthStart(), TimeRules.Midnight, () => 
            {
                // GC.Collect();
                Plot("Memory usage", "Memory", Convert.ToDecimal(OS.ApplicationMemoryUsed));
                // Plot("Active Securities", "Count", ActiveSecurities.Count);

                // var dict = typeof(BaseDataCollection).GetField("_symbolsCache", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic).GetValue(null) as Dictionary<string, Symbol>;
                // lock (dict) 
                // {
                //     dict.Clear();
                // }

                // var dict2 = typeof(SecurityIdentifier).GetField("SecurityIdentifierCache", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic).GetValue(null) as Dictionary<string, SecurityIdentifier>;
                // lock (dict2) 
                // {
                //     dict2.Clear();
                // }

                // if (Time.Month > 5)
                // {
                //     Quit();
                // }
            });
        }

        public override void OnData(Slice slice)
        {
            if (IsWarmingUp)
            {
                return;
            }
            // Quit("The end!");
        }

        public override void OnEndOfAlgorithm()
        {
            // Log($"From {_selections} selections, average of {_accumulator/_selections} contracts selected from average of {_accumulatorTotal/_selections}");            
        }
    }
}