using System.Globalization;
using System.Linq;
using System.Text;
using FinlyticCore.Dtos.Bot;
using FinlyticCore.Dtos.News;
using FinlyticCore.Dtos.TechnicalAnalysis;
using FinlyticCore.Dtos.Trading;

namespace FinlyticNotify.Services;

/// <summary>
/// Service interface for transforming trading and news events into structured ntfy push notifications.
/// </summary>
public interface INotificationFormatter
{
    /// <summary>
    /// Formats a new trade proposal into a high-priority opportunity notification.
    /// </summary>
    NtfyNotification FormatProposalNotification(TradeProposalDto proposal, string targetTopic);

    /// <summary>
    /// Formats an active trade lifecycle change into a user-specific status notification.
    /// </summary>
    NtfyNotification FormatTradeStatusNotification(ActiveTradeDto trade, string targetTopic);

    /// <summary>
    /// Formats an automated paper-trading bot execution event into a notification.
    /// </summary>
    NtfyNotification FormatBotTradeNotification(BotTradeOrderDto botTrade, string targetTopic);

    /// <summary>
    /// Formats an analyzed news article with sentiment evaluation into a push notification.
    /// </summary>
    NtfyNotification FormatNewsNotification(NewsArticleDto article, string targetTopic);
}

/// <summary>
/// Implementation of <see cref="INotificationFormatter"/> that creates emoji-rich Markdown messages
/// formatted for the ntfy mobile/web applications.
/// </summary>
public class NotificationFormatter : INotificationFormatter
{
    /// <inheritdoc />
    public NtfyNotification FormatProposalNotification(TradeProposalDto proposal, string targetTopic)
    {
        bool isBuy = proposal.Direction == SignalDirection.Buy;
        string dirEmoji = isBuy ? "🟢" : "🔴";
        string dirText = isBuy ? "Long" : "Short";
        string title = $"{dirEmoji} Neuer Trade-Vorschlag: {proposal.Symbol} ({dirText})";

        var tags = new List<string>
        {
            isBuy ? "chart_with_upwards_trend" : "chart_with_downwards_trend",
            "moneybag",
            "dart"
        };

        int priority = proposal.CompositeScore >= 80m ? 4 : 3;

        var sb = new StringBuilder();
        sb.AppendLine($"**Strategie:** {proposal.StrategyKey} | **Score:** {proposal.CompositeScore:F1}/100");
        sb.AppendLine($"**Einstieg:** {proposal.EntryPrice:F2} €");
        sb.AppendLine($"**Stop-Loss:** {proposal.InvalidationPrice:F2} €");

        var tp1 = proposal.ExitPlan?.TakeProfitStages?.FirstOrDefault();
        if (tp1 != null)
        {
            sb.AppendLine($"**Ziel (TP1):** {tp1.TargetPrice:F2} € ({tp1.Description})");
        }

        if (proposal.SelectedDerivative != null)
        {
            sb.AppendLine($"**Knock-Out:** {proposal.SelectedDerivative.Issuer} ({proposal.SelectedDerivative.OptionType}, Hebel: {proposal.SelectedDerivative.Leverage:F1}x)");
        }

        if (!string.IsNullOrWhiteSpace(proposal.AiValidation?.ThesisSummary))
        {
            sb.AppendLine();
            sb.AppendLine($"**KI-These:** {proposal.AiValidation.ThesisSummary}");
        }

        return new NtfyNotification(
            Topic: targetTopic,
            Title: title,
            Message: sb.ToString().TrimEnd(),
            Priority: priority,
            Tags: tags
        );
    }

    /// <inheritdoc />
    public NtfyNotification FormatTradeStatusNotification(ActiveTradeDto trade, string targetTopic)
    {
        string dirText = trade.Direction == SignalDirection.Buy ? "Long" : "Short";

        return trade.Status switch
        {
            TradeStatus.Active or TradeStatus.Proposed => new NtfyNotification(
                Topic: targetTopic,
                Title: $"⚡ Trade aktiv: {trade.Symbol} ({dirText})",
                Message: $"**Buy-In:** {trade.AverageBuyIn:F2} € | **Menge:** {trade.TotalQuantity:F2}\n" +
                         $"**Initialer Stop-Loss:** {trade.InitialStopLoss:F2} €\n" +
                         $"**Aktueller Kurs:** {trade.CurrentPrice:F2} €",
                Priority: 3,
                Tags: ["zap", "white_check_mark"]
            ),

            TradeStatus.Tp1Hit => new NtfyNotification(
                Topic: targetTopic,
                Title: $"🎯 Teilgewinn erreicht (TP1): {trade.Symbol} (+{trade.UnrealizedPnlPercent:F1}%)",
                Message: $"**Gewinn:** +{trade.UnrealizedPnlEur:F2} € (+{trade.UnrealizedPnlPercent:F1}%)\n" +
                         $"**Aktueller Kurs:** {trade.CurrentPrice:F2} € (Buy-In: {trade.AverageBuyIn:F2} €)\n" +
                         $"**Neuer Stop-Loss:** {trade.CurrentStopLoss:F2} € (Break-Even gesichert)",
                Priority: 4,
                Tags: ["tada", "dart", "chart_with_upwards_trend"]
            ),

            TradeStatus.Tp2Hit => new NtfyNotification(
                Topic: targetTopic,
                Title: $"🏆 Vollziel erreicht (TP2): {trade.Symbol} (+{trade.RealizedPnlEur:F2} €)",
                Message: $"**Realisierter Gewinn:** +{trade.RealizedPnlEur:F2} €\n" +
                         $"**Schlusskurs:** {trade.CurrentPrice:F2} € (Buy-In: {trade.AverageBuyIn:F2} €)\n" +
                         $"**Status:** Trade erfolgreich mit Maximalziel abgeschlossen!",
                Priority: 4,
                Tags: ["trophy", "money_with_wings", "star2"]
            ),

            TradeStatus.StoppedOut => new NtfyNotification(
                Topic: targetTopic,
                Title: $"🛑 Stop-Loss ausgelöst: {trade.Symbol} ({trade.RealizedPnlEur:F2} €)",
                Message: $"**Verlust:** {trade.RealizedPnlEur:F2} €\n" +
                         $"**Ausstiegskurs:** {trade.CurrentPrice:F2} € (Stop war bei {trade.CurrentStopLoss:F2} €)\n" +
                         $"**Status:** Position durch Stop-Loss risikokontrolliert geschlossen.",
                Priority: 4,
                Tags: ["octagonal_sign", "warning", "shield"]
            ),

            TradeStatus.Closed => new NtfyNotification(
                Topic: targetTopic,
                Title: $"🏁 Trade geschlossen: {trade.Symbol} (G/V: {trade.RealizedPnlEur:F2} €)",
                Message: $"**Realisierter G/V:** {trade.RealizedPnlEur:F2} €\n" +
                         $"**Schlusskurs:** {trade.CurrentPrice:F2} € (Buy-In: {trade.AverageBuyIn:F2} €)",
                Priority: 3,
                Tags: ["checkered_flag", "information_source"]
            ),

            _ => new NtfyNotification(
                Topic: targetTopic,
                Title: $"🛡️ Trade Update: {trade.Symbol} ({trade.Status})",
                Message: $"**Aktueller Stop-Loss:** {trade.CurrentStopLoss:F2} €\n" +
                         $"**Aktueller Kurs:** {trade.CurrentPrice:F2} € (Buy-In: {trade.AverageBuyIn:F2} €)\n" +
                         $"**Unrealisierter G/V:** {trade.UnrealizedPnlEur:F2} € ({trade.UnrealizedPnlPercent:F1}%)",
                Priority: 2,
                Tags: ["shield", "chart"]
            )
        };
    }

    /// <inheritdoc />
    public NtfyNotification FormatBotTradeNotification(BotTradeOrderDto botTrade, string targetTopic)
    {
        string dirText = botTrade.Direction == SignalDirection.Buy ? "Long" : "Short";
        string title = $"🤖 Bot Trade [{botTrade.Status}]: {botTrade.Symbol} ({dirText})";

        var tags = new List<string> { "robot", "chart" };
        if (botTrade.Status == BotPositionStatus.Tp1Hit || botTrade.Status == BotPositionStatus.Tp2Hit) tags.Add("dart");
        if (botTrade.Status == BotPositionStatus.StoppedOut) tags.Add("warning");

        var sb = new StringBuilder();
        sb.AppendLine($"**Venue:** {botTrade.Venue} | **Status:** {botTrade.Status}");
        sb.AppendLine($"**Buy-In:** {botTrade.AverageBuyIn:F2} € | **Menge:** {botTrade.FilledQuantity:F2}");
        sb.AppendLine($"**Stop-Loss:** {botTrade.CurrentStopLoss:F2} €");
        sb.AppendLine($"**Aktueller Kurs:** {botTrade.CurrentPrice:F2} €");

        if (botTrade.Status == BotPositionStatus.Closed || botTrade.Status == BotPositionStatus.StoppedOut || botTrade.Status == BotPositionStatus.Tp2Hit)
        {
            sb.AppendLine($"**Realisierter G/V:** {botTrade.RealizedPnlEur:F2} €");
        }
        else
        {
            sb.AppendLine($"**Unrealisierter G/V:** {botTrade.UnrealizedPnlEur:F2} €");
        }

        return new NtfyNotification(
            Topic: targetTopic,
            Title: title,
            Message: sb.ToString().TrimEnd(),
            Priority: 3,
            Tags: tags
        );
    }

    /// <inheritdoc />
    public NtfyNotification FormatNewsNotification(NewsArticleDto article, string targetTopic)
    {
        string sentimentLabel = (article.Sentiment ?? "NEUTRAL").ToUpperInvariant();
        double score = article.SentimentScore ?? 0.0;
        double confidence = article.Confidence ?? 0.0;

        string sentimentEmoji = sentimentLabel switch
        {
            "POSITIVE" => "🟢",
            "NEGATIVE" => "🔴",
            _ => "⚪"
        };

        string primaryAsset = article.MatchedAssets?.FirstOrDefault()?.Name
            ?? article.MatchedAssets?.FirstOrDefault()?.Isin
            ?? "Markt";

        string title = $"{sentimentEmoji} News ({sentimentLabel}): {primaryAsset}";

        var tags = new List<string> { "newspaper" };
        if (sentimentLabel == "POSITIVE")
        {
            tags.Add("chart_with_upwards_trend");
            tags.Add("tada");
        }
        else if (sentimentLabel == "NEGATIVE")
        {
            tags.Add("chart_with_downwards_trend");
            tags.Add("warning");
        }
        else
        {
            tags.Add("information_source");
        }

        int priority = (confidence >= 0.8 && Math.Abs(score) >= 0.6) ? 4 : 3;

        var sb = new StringBuilder();
        sb.AppendLine($"**{article.Title}**");
        sb.AppendLine();
        sb.AppendLine($"**Sentiment:** {sentimentLabel} (Score: {score:+0.00;-0.00;0.00} | Konfidenz: {confidence:P0})");

        if (article.MatchedAssets != null && article.MatchedAssets.Count > 0)
        {
            var assetList = string.Join(", ", article.MatchedAssets.Select(a => $"{a.Name} ({a.Isin})"));
            sb.AppendLine($"**Assets:** {assetList}");
        }

        if (!string.IsNullOrWhiteSpace(article.Summary))
        {
            sb.AppendLine();
            sb.AppendLine($"_{article.Summary}_");
        }

        sb.AppendLine();
        sb.AppendLine($"**Veröffentlicht:** {article.PublishedAt:dd.MM.yyyy HH:mm} UTC");

        return new NtfyNotification(
            Topic: targetTopic,
            Title: title,
            Message: sb.ToString().TrimEnd(),
            Priority: priority,
            Tags: tags,
            ClickUrl: !string.IsNullOrWhiteSpace(article.SourceUrl) ? article.SourceUrl : null
        );
    }
}