using System;
using System.IO;
using System.Linq;
using System.Text.Json;
using FinlyticCore.Models.Analyzer;
using FinlyticCore.Models.Trades;
using Microsoft.Extensions.Logging;

namespace FinlyticAnalyzer.Services;

public class WinRateCalculator : IWinRateCalculator
{
    private readonly ILogger<WinRateCalculator> _logger;
    private readonly string _feedbackDir;

    public WinRateCalculator(ILogger<WinRateCalculator> logger)
    {
        _logger = logger;
        _feedbackDir = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "data", "feedback");
        if (!Directory.Exists(_feedbackDir))
        {
            Directory.CreateDirectory(_feedbackDir);
        }
    }

    /// <summary>
    /// Calculates the win rate for a given sector and symbol under the specified market regime.
    /// </summary>
    public double CalculateWinRate(string sector, string symbol, VixMarketRegime regime)
    {
        try
        {
            if (!Directory.Exists(_feedbackDir)) return 65.0;

            var jsonFiles = Directory.GetFiles(_feedbackDir, "*.json", SearchOption.AllDirectories);
            if (jsonFiles.Length == 0) return 65.0;

            int totalTrades = 0;
            int winningTrades = 0;

            foreach (var file in jsonFiles)
            {
                var content = File.ReadAllText(file);
                var records = JsonSerializer.Deserialize<TradeFeedbackRecord[]>(content);
                if (records == null || records.Length == 0) continue;

                var matching = records.Where(r => 
                    string.Equals(r.Sector, sector, StringComparison.OrdinalIgnoreCase) &&
                    r.VixRegime == regime).ToList();

                foreach (var rec in matching)
                {
                    totalTrades++;
                    if (rec.IsWin) winningTrades++;
                }
            }

            if (totalTrades > 0)
            {
                double calculatedWinRate = (double)winningTrades / totalTrades * 100.0;
                _logger.LogInformation("[{Channel}] Calculated win-rate for Sector '{Sector}' in Regime '{Regime}': {WinRate:F1}% ({Wins}/{Total})",
                    "AnalyzerChannel", sector, regime, calculatedWinRate, winningTrades, totalTrades);
                return Math.Round(calculatedWinRate, 1);
            }
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "[{Channel}] Error reading feedback files for win-rate calculation. Falling back to default.", "AnalyzerChannel");
        }

        return 65.0; // Default baseline win-rate
    }
}