/*
 * 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 System.Linq;
using QuantConnect.Brokerages;
using QuantConnect.Data;
using QuantConnect.Interfaces;

namespace QuantConnect.Algorithm.CSharp
{
    /// <summary>
    /// Regression algorithm which tests that a two leg currency conversion happens correctly
    /// </summary>
    public class TwoLegCurrencyConversionRegressionAlgorithm : QCAlgorithm, IRegressionAlgorithmDefinition
    {
        private Symbol _ethUsdSymbol;
        private Symbol _ltcUsdSymbol;

        public override void Initialize()
        {
            SetStartDate(2018, 04, 04);
            SetEndDate(2018, 04, 04);
            SetBrokerageModel(BrokerageName.GDAX, AccountType.Cash);

            // GDAX doesn't have LTCETH or ETHLTC, but they do have ETHUSD and LTCUSD to form a path between ETH and LTC
            SetAccountCurrency("ETH");
            SetCash("ETH", 100000);
            SetCash("LTC", 100000);
            SetCash("USD", 100000);

            _ethUsdSymbol = AddCrypto("ETHUSD", Resolution.Minute).Symbol;
            _ltcUsdSymbol = AddCrypto("LTCUSD", Resolution.Minute).Symbol;
        }

        public override void OnData(Slice slice)
        {
            if (!Portfolio.Invested)
            {
                MarketOrder(_ltcUsdSymbol, 1);
            }
        }

        public override void OnEndOfAlgorithm()
        {
            var ltcCash = Portfolio.CashBook["LTC"];

            var conversionSymbols = ltcCash.CurrencyConversion.ConversionRateSecurities
                .Select(x => x.Symbol)
                .ToList();

            if (conversionSymbols.Count != 2)
            {
                throw new RegressionTestException(
                    $"Expected two conversion rate securities for LTC to ETH, is {conversionSymbols.Count}");
            }

            if (conversionSymbols[0] != _ltcUsdSymbol)
            {
                throw new RegressionTestException(
                    $"Expected first conversion rate security from LTC to ETH to be {_ltcUsdSymbol}, is {conversionSymbols[0]}");
            }

            if (conversionSymbols[1] != _ethUsdSymbol)
            {
                throw new RegressionTestException(
                    $"Expected second conversion rate security from LTC to ETH to be {_ethUsdSymbol}, is {conversionSymbols[1]}");
            }

            var ltcUsdValue = Securities[_ltcUsdSymbol].GetLastData().Value;
            var ethUsdValue = Securities[_ethUsdSymbol].GetLastData().Value;

            var expectedConversionRate = ltcUsdValue / ethUsdValue;
            var actualConversionRate = ltcCash.ConversionRate;

            if (actualConversionRate != expectedConversionRate)
            {
                throw new RegressionTestException(
                    $"Expected conversion rate from LTC to ETH to be {expectedConversionRate}, is {actualConversionRate}");
            }
        }

        /// <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 List<Language> Languages { get; } = new() { Language.CSharp, Language.Python };

        /// <summary>
        /// Data Points count of all timeslices of algorithm
        /// </summary>
        public long DataPoints => 5765;

        /// <summary>
        /// Data Points count of the algorithm history
        /// </summary>
        public int AlgorithmHistoryDataPoints => 120;

        /// <summary>
        /// Final status of the algorithm
        /// </summary>
        public AlgorithmStatus AlgorithmStatus => AlgorithmStatus.Completed;

        /// <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 Orders", "1"},
            {"Average Win", "0%"},
            {"Average Loss", "0%"},
            {"Compounding Annual Return", "0%"},
            {"Drawdown", "0%"},
            {"Expectancy", "0"},
            {"Start Equity", "132348.63"},
            {"End Equity", "131620.05"},
            {"Net Profit", "0%"},
            {"Sharpe Ratio", "0"},
            {"Sortino Ratio", "0"},
            {"Probabilistic Sharpe Ratio", "0%"},
            {"Loss Rate", "0%"},
            {"Win Rate", "0%"},
            {"Profit-Loss Ratio", "0"},
            {"Alpha", "0"},
            {"Beta", "0"},
            {"Annual Standard Deviation", "0"},
            {"Annual Variance", "0"},
            {"Information Ratio", "0"},
            {"Tracking Error", "0"},
            {"Treynor Ratio", "0"},
            {"Total Fees", "Ξ0.00"},
            {"Estimated Strategy Capacity", "Ξ2000.00"},
            {"Lowest Capacity Asset", "LTCUSD 2XR"},
            {"Portfolio Turnover", "0.00%"},
            {"Drawdown Recovery", "0"},
            {"OrderListHash", "c5d6001a28b12bd2d6c714a9aaa3aa07"}
        };
    }
}