using TradingBot.Models;
using System.Text.Json;

namespace TradingBot.Services;

/// <summary>
/// Service for managing trading indicators configuration and signals
/// </summary>
public class IndicatorsService
{
    private readonly Dictionary<string, IndicatorConfig> _indicators = new();
    private readonly Dictionary<string, Dictionary<string, IndicatorStatus>> _indicatorStatus = new();
    private readonly List<IndicatorSignal> _recentSignals = new();
    private readonly string _configPath;
    private const int MaxSignals = 100;

    public event Action? OnIndicatorsChanged;
    public event Action<IndicatorSignal>? OnSignalGenerated;

    public IndicatorsService()
    {
        _configPath = Path.Combine(Directory.GetCurrentDirectory(), "data", "indicators-config.json");
        InitializeDefaultIndicators();
        LoadConfiguration();
    }

    private void InitializeDefaultIndicators()
    {
        _indicators["rsi"] = new IndicatorConfig
        {
            Id = "rsi",
            Name = "RSI",
            Description = "Relative Strength Index - Misura la forza del trend",
            Type = IndicatorType.RSI,
            IsEnabled = true,
            Period = 14,
            OverboughtThreshold = 70,
            OversoldThreshold = 30
        };

        _indicators["macd"] = new IndicatorConfig
        {
            Id = "macd",
            Name = "MACD",
            Description = "Moving Average Convergence Divergence - Identifica cambi di trend",
            Type = IndicatorType.MACD,
            IsEnabled = true,
            FastPeriod = 12,
            SlowPeriod = 26,
            SignalPeriod = 9
        };

        _indicators["sma_20"] = new IndicatorConfig
        {
            Id = "sma_20",
            Name = "SMA 20",
            Description = "Simple Moving Average 20 periodi - Trend a breve termine",
            Type = IndicatorType.SMA,
            IsEnabled = true,
            Period = 20
        };

        _indicators["sma_50"] = new IndicatorConfig
        {
            Id = "sma_50",
            Name = "SMA 50",
            Description = "Simple Moving Average 50 periodi - Trend a medio termine",
            Type = IndicatorType.SMA,
            IsEnabled = true,
            Period = 50
        };

        _indicators["ema_12"] = new IndicatorConfig
        {
            Id = "ema_12",
            Name = "EMA 12",
            Description = "Exponential Moving Average 12 periodi - Reattivo ai cambiamenti",
            Type = IndicatorType.EMA,
            IsEnabled = true,
            Period = 12
        };

        _indicators["bollinger"] = new IndicatorConfig
        {
            Id = "bollinger",
            Name = "Bollinger Bands",
            Description = "Bande di Bollinger - Misura volatilità e livelli estremi",
            Type = IndicatorType.BollingerBands,
            IsEnabled = true,
            Period = 20
        };

        _indicators["stochastic"] = new IndicatorConfig
        {
            Id = "stochastic",
            Name = "Stochastic",
            Description = "Oscillatore Stocastico - Identifica momenti di inversione",
            Type = IndicatorType.Stochastic,
            IsEnabled = false,
            Period = 14,
            OverboughtThreshold = 80,
            OversoldThreshold = 20
        };
    }

    /// <summary>
    /// Get all indicator configurations
    /// </summary>
    public IReadOnlyDictionary<string, IndicatorConfig> GetIndicators()
    {
        return _indicators;
    }

    /// <summary>
    /// Get enabled indicators only
    /// </summary>
    public IEnumerable<IndicatorConfig> GetEnabledIndicators()
    {
        return _indicators.Values.Where(i => i.IsEnabled);
    }

    /// <summary>
    /// Update indicator configuration
    /// </summary>
    public void UpdateIndicator(string id, IndicatorConfig config)
    {
        _indicators[id] = config;
        SaveConfiguration();
        OnIndicatorsChanged?.Invoke();
    }

    /// <summary>
    /// Toggle indicator on/off
    /// </summary>
    public void ToggleIndicator(string id, bool enabled)
    {
        if (_indicators.TryGetValue(id, out var indicator))
        {
            indicator.IsEnabled = enabled;
            SaveConfiguration();
            OnIndicatorsChanged?.Invoke();
        }
    }

    /// <summary>
    /// Update indicator status for a symbol
    /// </summary>
    public void UpdateIndicatorStatus(string indicatorId, string symbol, IndicatorStatus status)
    {
        if (!_indicatorStatus.ContainsKey(symbol))
        {
            _indicatorStatus[symbol] = new Dictionary<string, IndicatorStatus>();
        }

        _indicatorStatus[symbol][indicatorId] = status;
    }

    /// <summary>
    /// Get indicator status for a symbol
    /// </summary>
    public IndicatorStatus? GetIndicatorStatus(string indicatorId, string symbol)
    {
        if (_indicatorStatus.TryGetValue(symbol, out var symbolIndicators))
        {
            symbolIndicators.TryGetValue(indicatorId, out var status);
            return status;
        }
        return null;
    }

    /// <summary>
    /// Get all indicator statuses for a symbol
    /// </summary>
    public IEnumerable<IndicatorStatus> GetSymbolIndicators(string symbol)
    {
        if (_indicatorStatus.TryGetValue(symbol, out var symbolIndicators))
        {
            return symbolIndicators.Values;
        }
        return Enumerable.Empty<IndicatorStatus>();
    }

    /// <summary>
    /// Generate and record a signal
    /// </summary>
    public void GenerateSignal(IndicatorSignal signal)
    {
        _recentSignals.Insert(0, signal);
        
        // Maintain max size
        while (_recentSignals.Count > MaxSignals)
        {
            _recentSignals.RemoveAt(_recentSignals.Count - 1);
        }

        OnSignalGenerated?.Invoke(signal);
    }

    /// <summary>
    /// Get recent signals
    /// </summary>
    public IReadOnlyList<IndicatorSignal> GetRecentSignals(int count = 20)
    {
        return _recentSignals.Take(count).ToList().AsReadOnly();
    }

    /// <summary>
    /// Get signals for a specific symbol
    /// </summary>
    public IReadOnlyList<IndicatorSignal> GetSymbolSignals(string symbol, int count = 20)
    {
        return _recentSignals
            .Where(s => s.Symbol.Equals(symbol, StringComparison.OrdinalIgnoreCase))
            .Take(count)
            .ToList()
            .AsReadOnly();
    }

    /// <summary>
    /// Analyze indicators and generate trading recommendation
    /// </summary>
    public TradingRecommendation AnalyzeIndicators(string symbol)
    {
        var recommendation = new TradingRecommendation
        {
            Symbol = symbol,
            Timestamp = DateTime.UtcNow
        };

        var symbolIndicators = GetSymbolIndicators(symbol).ToList();
        if (!symbolIndicators.Any())
        {
            recommendation.Action = "HOLD";
            recommendation.Confidence = 0;
            recommendation.Reason = "Indicatori non disponibili";
            return recommendation;
        }

        int buySignals = 0;
        int sellSignals = 0;
        int totalEnabled = GetEnabledIndicators().Count();

        foreach (var status in symbolIndicators)
        {
            if (!_indicators.TryGetValue(status.IndicatorId, out var config) || !config.IsEnabled)
                continue;

            switch (status.Condition)
            {
                case MarketCondition.Oversold:
                case MarketCondition.Bullish:
                    buySignals++;
                    recommendation.SupportingIndicators.Add($"{config.Name}: {status.Recommendation}");
                    break;

                case MarketCondition.Overbought:
                case MarketCondition.Bearish:
                    sellSignals++;
                    recommendation.SupportingIndicators.Add($"{config.Name}: {status.Recommendation}");
                    break;
            }
        }

        // Determine action based on signals
        if (buySignals > sellSignals && buySignals >= totalEnabled * 0.6m)
        {
            recommendation.Action = "BUY";
            recommendation.Confidence = (decimal)buySignals / totalEnabled * 100;
            recommendation.Reason = $"{buySignals}/{totalEnabled} indicatori suggeriscono acquisto";
        }
        else if (sellSignals > buySignals && sellSignals >= totalEnabled * 0.6m)
        {
            recommendation.Action = "SELL";
            recommendation.Confidence = (decimal)sellSignals / totalEnabled * 100;
            recommendation.Reason = $"{sellSignals}/{totalEnabled} indicatori suggeriscono vendita";
        }
        else
        {
            recommendation.Action = "HOLD";
            recommendation.Confidence = 50;
            recommendation.Reason = "Segnali contrastanti - attendere conferma";
        }

        return recommendation;
    }

    private void SaveConfiguration()
    {
        try
        {
            var directory = Path.GetDirectoryName(_configPath);
            if (directory != null && !Directory.Exists(directory))
            {
                Directory.CreateDirectory(directory);
            }

            var json = JsonSerializer.Serialize(_indicators, new JsonSerializerOptions
            {
                WriteIndented = true
            });

            File.WriteAllText(_configPath, json);
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error saving indicators configuration: {ex.Message}");
        }
    }

    private void LoadConfiguration()
    {
        try
        {
            if (File.Exists(_configPath))
            {
                var json = File.ReadAllText(_configPath);
                var loaded = JsonSerializer.Deserialize<Dictionary<string, IndicatorConfig>>(json);
                
                if (loaded != null)
                {
                    foreach (var kvp in loaded)
                    {
                        _indicators[kvp.Key] = kvp.Value;
                    }
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error loading indicators configuration: {ex.Message}");
        }
    }
}

/// <summary>
/// Trading recommendation based on multiple indicators
/// </summary>
public class TradingRecommendation
{
    public string Symbol { get; set; } = string.Empty;
    public DateTime Timestamp { get; set; }
    public string Action { get; set; } = "HOLD"; // BUY, SELL, HOLD
    public decimal Confidence { get; set; }
    public string Reason { get; set; } = string.Empty;
    public List<string> SupportingIndicators { get; set; } = new();
}