/*
 * 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 NodaTime;
using QuantConnect.Data.Consolidators;
using QuantConnect.Data.Market;
using QuantConnect.Interfaces;
using QuantConnect.Util;

namespace QuantConnect.Data
{
    /// <summary>
    ///     Enumerable Subscription Management Class
    /// </summary>
    public class SubscriptionManager
    {
        private IAlgorithmSubscriptionManager _subscriptionManager;

        /// <summary>
        ///     Instance that implements <see cref="ISubscriptionDataConfigService" />
        /// </summary>
        public ISubscriptionDataConfigService SubscriptionDataConfigService => _subscriptionManager;

        /// <summary>
        ///     Returns an IEnumerable of Subscriptions
        /// </summary>
        public IEnumerable<SubscriptionDataConfig> Subscriptions => _subscriptionManager.SubscriptionManagerSubscriptions;

        /// <summary>
        ///     Flags the existence of custom data in the subscriptions
        /// </summary>
        public bool HasCustomData
        {
            get { return _subscriptionManager.HasCustomData; }
            set { _subscriptionManager.HasCustomData = value; }
        }

        /// <summary>
        ///     The different <see cref="TickType" /> each <see cref="SecurityType" /> supports
        /// </summary>
        public Dictionary<SecurityType, List<TickType>> AvailableDataTypes => _subscriptionManager.AvailableDataTypes;

        /// <summary>
        ///     Get the count of assets:
        /// </summary>
        public int Count => _subscriptionManager.SubscriptionManagerCount();

        /// <summary>
        ///     Add Market Data Required (Overloaded method for backwards compatibility).
        /// </summary>
        /// <param name="symbol">Symbol of the asset we're like</param>
        /// <param name="resolution">Resolution of Asset Required</param>
        /// <param name="timeZone">The time zone the subscription's data is time stamped in</param>
        /// <param name="exchangeTimeZone">
        ///     Specifies the time zone of the exchange for the security this subscription is for. This
        ///     is this output time zone, that is, the time zone that will be used on BaseData instances
        /// </param>
        /// <param name="isCustomData">True if this is custom user supplied data, false for normal QC data</param>
        /// <param name="fillDataForward">when there is no data pass the last tradebar forward</param>
        /// <param name="extendedMarketHours">Request premarket data as well when true </param>
        /// <returns>
        ///     The newly created <see cref="SubscriptionDataConfig" /> or existing instance if it already existed
        /// </returns>
        public SubscriptionDataConfig Add(
            Symbol symbol,
            Resolution resolution,
            DateTimeZone timeZone,
            DateTimeZone exchangeTimeZone,
            bool isCustomData = false,
            bool fillDataForward = true,
            bool extendedMarketHours = false
            )
        {
            //Set the type: market data only comes in two forms -- ticks(trade by trade) or tradebar(time summaries)
            var dataType = typeof(TradeBar);
            if (resolution == Resolution.Tick)
            {
                dataType = typeof(Tick);
            }

            var tickType = LeanData.GetCommonTickTypeForCommonDataTypes(dataType, symbol.SecurityType);
            return Add(dataType, tickType, symbol, resolution, timeZone, exchangeTimeZone, isCustomData, fillDataForward,
                extendedMarketHours);
        }

        /// <summary>
        ///     Add Market Data Required - generic data typing support as long as Type implements BaseData.
        /// </summary>
        /// <param name="dataType">Set the type of the data we're subscribing to.</param>
        /// <param name="tickType">Tick type for the subscription.</param>
        /// <param name="symbol">Symbol of the asset we're like</param>
        /// <param name="resolution">Resolution of Asset Required</param>
        /// <param name="dataTimeZone">The time zone the subscription's data is time stamped in</param>
        /// <param name="exchangeTimeZone">
        ///     Specifies the time zone of the exchange for the security this subscription is for. This
        ///     is this output time zone, that is, the time zone that will be used on BaseData instances
        /// </param>
        /// <param name="isCustomData">True if this is custom user supplied data, false for normal QC data</param>
        /// <param name="fillDataForward">when there is no data pass the last tradebar forward</param>
        /// <param name="extendedMarketHours">Request premarket data as well when true </param>
        /// <param name="isInternalFeed">
        ///     Set to true to prevent data from this subscription from being sent into the algorithm's
        ///     OnData events
        /// </param>
        /// <param name="isFilteredSubscription">
        ///     True if this subscription should have filters applied to it (market hours/user
        ///     filters from security), false otherwise
        /// </param>
        /// <param name="dataNormalizationMode">Define how data is normalized</param>
        /// <returns>
        ///     The newly created <see cref="SubscriptionDataConfig" /> or existing instance if it already existed
        /// </returns>
        public SubscriptionDataConfig Add(
            Type dataType,
            TickType tickType,
            Symbol symbol,
            Resolution resolution,
            DateTimeZone dataTimeZone,
            DateTimeZone exchangeTimeZone,
            bool isCustomData,
            bool fillDataForward = true,
            bool extendedMarketHours = false,
            bool isInternalFeed = false,
            bool isFilteredSubscription = true,
            DataNormalizationMode dataNormalizationMode = DataNormalizationMode.Adjusted
            )
        {
            return SubscriptionDataConfigService.Add(symbol, resolution, fillDataForward,
                extendedMarketHours, isFilteredSubscription, isInternalFeed, isCustomData,
                new List<Tuple<Type, TickType>> {new Tuple<Type, TickType>(dataType, tickType)},
                dataNormalizationMode).First();
        }


        /// <summary>
        ///     Add a consolidator for the symbol
        /// </summary>
        /// <param name="symbol">Symbol of the asset to consolidate</param>
        /// <param name="consolidator">The consolidator</param>
        public void AddConsolidator(Symbol symbol, IDataConsolidator consolidator)
        {
            // Find the right subscription and add the consolidator to it
            var subscriptions = Subscriptions.Where(x => x.Symbol == symbol).ToList();

            if (subscriptions.Count == 0)
            {
                // If we made it here it is because we never found the symbol in the subscription list
                throw new ArgumentException("Please subscribe to this symbol before adding a consolidator for it. Symbol: " +
                    symbol.Value);
            }

            foreach (var subscription in subscriptions)
            {
                // we need to be able to pipe data directly from the data feed into the consolidator
                if (IsSubscriptionValidForConsolidator(subscription, consolidator))
                {
                    subscription.Consolidators.Add(consolidator);
                    return;
                }
            }

            throw new ArgumentException("Type mismatch found between consolidator and symbol. " +
                $"Symbol: {symbol.Value} does not support input type: {consolidator.InputType.Name}. " +
                $"Supported types: {string.Join(",", subscriptions.Select(x => x.Type.Name))}.");
        }

        /// <summary>
        ///     Removes the specified consolidator for the symbol
        /// </summary>
        /// <param name="symbol">The symbol the consolidator is receiving data from</param>
        /// <param name="consolidator">The consolidator instance to be removed</param>
        public void RemoveConsolidator(Symbol symbol, IDataConsolidator consolidator)
        {
            // remove consolidator from each subscription
            foreach (var subscription in Subscriptions.Where(x => x.Symbol == symbol))
            {
                subscription.Consolidators.Remove(consolidator);
            }

            // dispose of the consolidator to remove any remaining event handlers
            consolidator.DisposeSafely();
        }

        /// <summary>
        ///     Hard code the set of default available data feeds
        /// </summary>
        public static Dictionary<SecurityType, List<TickType>> DefaultDataTypes()
        {
            return new Dictionary<SecurityType, List<TickType>>
            {
                {SecurityType.Base, new List<TickType> {TickType.Trade}},
                {SecurityType.Forex, new List<TickType> {TickType.Quote}},
                {SecurityType.Equity, new List<TickType> {TickType.Trade}},
                {SecurityType.Option, new List<TickType> {TickType.Quote, TickType.Trade, TickType.OpenInterest}},
                {SecurityType.Cfd, new List<TickType> {TickType.Quote}},
                {SecurityType.Future, new List<TickType> {TickType.Quote, TickType.Trade, TickType.OpenInterest}},
                {SecurityType.Commodity, new List<TickType> {TickType.Trade}},
                {SecurityType.Crypto, new List<TickType> {TickType.Trade, TickType.Quote}}
            };
        }

        /// <summary>
        ///     Get the available data types for a security
        /// </summary>
        public IReadOnlyList<TickType> GetDataTypesForSecurity(SecurityType securityType)
        {
            return AvailableDataTypes[securityType];
        }

        /// <summary>
        ///     Get the data feed types for a given <see cref="SecurityType" /> <see cref="Resolution" />
        /// </summary>
        /// <param name="symbolSecurityType">The <see cref="SecurityType" /> used to determine the types</param>
        /// <param name="resolution">The resolution of the data requested</param>
        /// <param name="isCanonical">Indicates whether the security is Canonical (future and options)</param>
        /// <returns>Types that should be added to the <see cref="SubscriptionDataConfig" /></returns>
        public List<Tuple<Type, TickType>> LookupSubscriptionConfigDataTypes(
            SecurityType symbolSecurityType,
            Resolution resolution,
            bool isCanonical
            )
        {
            return _subscriptionManager.LookupSubscriptionConfigDataTypes(symbolSecurityType, resolution, isCanonical);
        }

        /// <summary>
        ///     Sets the Subscription Manager
        /// </summary>
        public void SetDataManager(IAlgorithmSubscriptionManager subscriptionManager)
        {
            _subscriptionManager = subscriptionManager;
        }

        /// <summary>
        /// Checks if the subscription is valid for the consolidator
        /// </summary>
        /// <param name="subscription">The subscription configuration</param>
        /// <param name="consolidator">The consolidator</param>
        /// <returns>true if the subscription is valid for the consolidator</returns>
        public static bool IsSubscriptionValidForConsolidator(SubscriptionDataConfig subscription, IDataConsolidator consolidator)
        {
            if (subscription.Type == typeof(Tick))
            {
                var tickType = LeanData.GetCommonTickTypeForCommonDataTypes(consolidator.OutputType, subscription.Symbol.SecurityType);
                return subscription.TickType == tickType;
            }

            return consolidator.InputType.IsAssignableFrom(subscription.Type);
        }
    }
}