using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;

namespace Myc.HmaSma
{
    /// <summary>
    /// DTO representing a single row in the HMA/SMA configuration file.
    /// </summary>
    public class HmaSmaParameters
    {
        // Initialized to string.Empty to satisfy CS8618
        public string Symbol { get; set; } = string.Empty;
        public string Timeframe { get; set; } = string.Empty;
        public double EntrySig { get; set; }
        public double SlSig { get; set; }
        public int SmaBias { get; set; }
        public int HmaBias { get; set; }
        public int HmaCluster { get; set; }
        public bool BiasFilter { get; set; }
        public int BiasAvg { get; set; }
        public bool DynMgmt { get; set; }
        public bool TelegramOnly { get; set; }

        public override string ToString()
        {
            return $"{Symbol} {Timeframe}: SMA={SmaBias}, HMA={HmaBias}, Cluster={HmaCluster}";
        }
    }

    /// <summary>
    /// Handles parsing and caching of HMA/SMA configuration files.
    /// </summary>
    public class HmaSmaLoader
    {
        // Key: "SYMBOL_TIMEFRAME" (Normalized to UpperCase)
        private readonly Dictionary<string, HmaSmaParameters> _cache = new Dictionary<string, HmaSmaParameters>();
        private readonly string _filePath;

        public HmaSmaLoader(string filePath)
        {
            _filePath = filePath;
        }

        /// <summary>
        /// Reads the file and populates the internal cache.
        /// Throws FileNotFoundException if file is missing.
        /// Returns number of successfully loaded entries.
        /// </summary>
        public int Load()
        {
            _cache.Clear();

            if (!File.Exists(_filePath))
                throw new FileNotFoundException($"Config file not found: {_filePath}");

            var lines = File.ReadAllLines(_filePath);
            int loadedCount = 0;

            foreach (var line in lines)
            {
                var trimmed = line.Trim();
                if (string.IsNullOrWhiteSpace(trimmed) || trimmed.StartsWith("#"))
                    continue;

                // Split by whitespace (tabs or spaces)
                var cols = trimmed.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);

                // Ensure we have at least 11 columns based on specification
                if (cols.Length < 11)
                    continue;

                try
                {
                    var param = new HmaSmaParameters
                    {
                        Symbol = cols[0],
                        Timeframe = cols[1],
                        EntrySig = double.Parse(cols[2], CultureInfo.InvariantCulture),
                        SlSig = double.Parse(cols[3], CultureInfo.InvariantCulture),
                        SmaBias = int.Parse(cols[4], CultureInfo.InvariantCulture),
                        HmaBias = int.Parse(cols[5], CultureInfo.InvariantCulture),
                        HmaCluster = int.Parse(cols[6], CultureInfo.InvariantCulture),
                        BiasFilter = bool.Parse(cols[7]),
                        BiasAvg = int.Parse(cols[8], CultureInfo.InvariantCulture),
                        DynMgmt = bool.Parse(cols[9]),
                        TelegramOnly = bool.Parse(cols[10])
                    };

                    string key = BuildKey(param.Symbol, param.Timeframe);
                    
                    // Overwrite duplicates if they exist lower in the file
                    _cache[key] = param;
                    loadedCount++;
                }
                catch (Exception)
                {
                    // Fail silently for single bad lines, or log if logger provided.
                    // For library code, we skip invalid lines to ensure robustness.
                    continue;
                }
            }

            return loadedCount;
        }

        /// <summary>
        /// Retrieves configuration for a specific symbol and timeframe.
        /// Returns null if not found.
        /// </summary>
        public HmaSmaParameters? GetParameters(string symbol, string timeframe)
        {
            string key = BuildKey(symbol, timeframe);
            return _cache.TryGetValue(key, out var parameters) ? parameters : null;
        }

        private static string BuildKey(string symbol, string timeframe)
        {
            return $"{symbol.ToUpperInvariant()}_{timeframe.ToUpperInvariant()}";
        }
    }
}