/*
 * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

using System;
using System.Collections.Generic;
using QuantConnect.Data;
using QuantConnect.Interfaces;
using QuantConnect.Orders.Fees;
using QuantConnect.Securities;

namespace QuantConnect.Algorithm.CSharp
{
    /// <summary>
    /// Regression test algorithm where custom a <see cref="FeeModel"/> returns <see cref="OrderFee.Zero"/>
    /// </summary>
    public class ZeroFeeRegressionAlgorithm : QCAlgorithm, IRegressionAlgorithmDefinition
    {
        private Security _security;
        // Adding this so we only trade once, so math is easier and clear
        private bool _alreadyTraded;

        /// <summary>
        /// Initialise the data and resolution required, as well as the cash and start-end dates for your algorithm. All algorithms must initialized.
        /// </summary>
        public override void Initialize()
        {
            SetStartDate(2013, 10, 07);  //Set Start Date
            SetEndDate(2013, 10, 11);    //Set End Date
            SetCash(100000);             //Set Strategy Cash

            _security = AddEquity("SPY", Resolution.Minute);
            _security.FeeModel = new ZeroFeeModel();
        }

        /// <summary>
        /// OnData event is the primary entry point for your algorithm. Each new data point will be pumped in here.
        /// </summary>
        /// <param name="data">Slice object keyed by symbol containing the stock data</param>
        public override void OnData(Slice data)
        {
            if (!Portfolio.Invested && !_alreadyTraded)
            {
                _alreadyTraded = true;
                SetHoldings(_security.Symbol, 1);
                Debug("Purchased Stock");
            }
            else
            {
                Liquidate(_security.Symbol);
            }
        }

        public override void OnEndOfAlgorithm()
        {
            Log($"TotalPortfolioValue: {Portfolio.TotalPortfolioValue}");
            Log($"CashBook: {Portfolio.CashBook}");
            Log($"Holdings.TotalCloseProfit: {_security.Holdings.TotalCloseProfit()}");

            if (Portfolio.CashBook["USD"].Amount - _security.Holdings.LastTradeProfit != 100000)
            {
                throw new Exception("Unexpected USD cash amount: " +
                    $"{Portfolio.CashBook["USD"].Amount}");
            }
            if (Portfolio.CashBook.ContainsKey(Currencies.NullCurrency))
            {
                throw new Exception("Unexpected NullCurrency cash");
            }

            var closedTrade = TradeBuilder.ClosedTrades[0];
            if (closedTrade.TotalFees != 0)
            {
                throw new Exception($"Unexpected closed trades total fees {closedTrade.TotalFees}");
            }
            if (_security.Holdings.TotalFees != 0)
            {
                throw new Exception($"Unexpected closed trades total fees {closedTrade.TotalFees}");
            }
        }

        internal class ZeroFeeModel : FeeModel
        {
            public override OrderFee GetOrderFee(OrderFeeParameters parameters)
            {
                return OrderFee.Zero;
            }
        }

        /// <summary>
        /// This is used by the regression test system to indicate if the open source Lean repository has the required data to run this algorithm.
        /// </summary>
        public bool CanRunLocally { get; } = true;

        /// <summary>
        /// This is used by the regression test system to indicate which languages this algorithm is written in.
        /// </summary>
        public Language[] Languages { get; } = { Language.CSharp };

        /// <summary>
        /// This is used by the regression test system to indicate what the expected statistics are from running the algorithm
        /// </summary>
        public Dictionary<string, string> ExpectedStatistics => new Dictionary<string, string>
        {
            {"Total Trades", "2"},
            {"Average Win", "0%"},
            {"Average Loss", "-0.04%"},
            {"Compounding Annual Return", "-2.573%"},
            {"Drawdown", "0.000%"},
            {"Expectancy", "-1"},
            {"Net Profit", "-0.036%"},
            {"Sharpe Ratio", "-6.481"},
            {"Loss Rate", "100%"},
            {"Win Rate", "0%"},
            {"Profit-Loss Ratio", "0"},
            {"Alpha", "-0.015"},
            {"Beta", "0.001"},
            {"Annual Standard Deviation", "0.002"},
            {"Annual Variance", "0"},
            {"Information Ratio", "-1.974"},
            {"Tracking Error", "0.188"},
            {"Treynor Ratio", "-20.905"},
            {"Total Fees", "$0.00"}
        };
    }
}