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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;

public class ExposureMatrixAggregator
{
    /// <summary>
    /// Aggregates a matrix of net currency exposures across open FX positions.
    /// Values represent the net nominal exposure in each native currency.
    /// </summary>
    public Dictionary<string, double> CalculateNetExposureMatrix(IEnumerable<ITradingPosition> positions)
    {
        var matrix = new ConcurrentDictionary<string, double>();

        foreach (var pos in positions)
        {
            // Skip non-FX symbols or indices (assumes standard 6-character format like "EURUSD")
            if (string.IsNullOrWhiteSpace(pos.Symbol) || pos.Symbol.Length != 6)
                continue;

            string baseCcy = pos.Symbol.Substring(0, 3);
            string quoteCcy = pos.Symbol.Substring(3, 3);

            // Base currency delta: Long adds to base exposure, Short subtracts
            double baseDeltaNative = pos.IsLong ? pos.VolumeInUnits : -pos.VolumeInUnits;
            
            // Quote currency delta: Opposite direction, factored by current price
            double quoteDeltaNative = pos.IsLong 
                ? -(pos.VolumeInUnits * pos.CurrentPrice) 
                : (pos.VolumeInUnits * pos.CurrentPrice);

            // Floating PnL is realized in the quote currency, shifting its real-time delta
            quoteDeltaNative += pos.FloatingPnLNative;

            // Thread-safe aggregation across all positions
            matrix.AddOrUpdate(baseCcy, baseDeltaNative, (_, current) => current + baseDeltaNative);
            matrix.AddOrUpdate(quoteCcy, quoteDeltaNative, (_, current) => current + quoteDeltaNative);
        }

        return matrix.ToDictionary(k => k.Key, v => Math.Round(v.Value, 2));
    }
}

// Interface to decouple from specific platform implementations (cTrader, MT5, or custom REST APIs)
public interface ITradingPosition
{
    string Symbol { get; }
    double VolumeInUnits { get; }
    bool IsLong { get; }
    double CurrentPrice { get; }
    double FloatingPnLNative { get; } // Gross PnL denominated in the Quote currency
}