using System.Windows;
using System.Windows.Input;
using System.Windows.Media;

namespace AxCopilot.Views;

public partial class ChatWindow
{
    private void RefreshContextUsageVisual()
    {
        if (TokenUsageCard == null || TokenUsageArc == null || TokenUsagePercentText == null
            || TokenUsageSummaryText == null || TokenUsageHintText == null
            || TokenUsageThresholdMarker == null || CompactNowLabel == null)
            return;

        var showContextUsage = _activeTab is "Cowork" or "Code";
        TokenUsageCard.Visibility = showContextUsage ? Visibility.Visible : Visibility.Collapsed;
        if (!showContextUsage)
        {
            if (TokenUsagePopup != null)
                TokenUsagePopup.IsOpen = false;
            return;
        }

        var llm = _settings.Settings.Llm;
        var maxContextTokens = Math.Clamp(llm.MaxContextTokens, 1024, 1_000_000);
        var triggerPercent = Math.Clamp(llm.ContextCompactTriggerPercent, 10, 95);
        var triggerRatio = triggerPercent / 100.0;

        int messageTokens;
        lock (_convLock)
            messageTokens = _currentConversation?.Messages?.Count > 0
                ? Services.TokenEstimator.EstimateMessages(_currentConversation.Messages)
                : 0;

        var draftText = InputBox?.Text ?? "";
        var draftTokens = string.IsNullOrWhiteSpace(draftText) ? 0 : Services.TokenEstimator.Estimate(draftText) + 4;
        var currentTokens = Math.Max(0, messageTokens + draftTokens);
        var usageRatio = Services.TokenEstimator.GetContextUsage(currentTokens, maxContextTokens);

        var accentBrush = TryFindResource("AccentColor") as Brush ?? Brushes.DodgerBlue;
        Brush progressBrush = accentBrush;
        string summary;
        string compactLabel;

        if (usageRatio >= 1.0)
        {
            progressBrush = Brushes.IndianRed;
            summary = "컨텍스트 한도 초과";
            compactLabel = "지금 압축";
        }
        else if (usageRatio >= triggerRatio)
        {
            progressBrush = Brushes.DarkOrange;
            summary = llm.EnableProactiveContextCompact ? "곧 자동 압축" : "압축 임계 도달";
            compactLabel = "압축 권장";
        }
        else if (usageRatio >= triggerRatio * 0.7)
        {
            progressBrush = Brushes.Goldenrod;
            summary = "컨텍스트 사용 증가";
            compactLabel = "미리 압축";
        }
        else
        {
            summary = "컨텍스트 여유";
            compactLabel = "압축";
        }

        TokenUsageArc.Stroke = progressBrush;
        TokenUsageThresholdMarker.Fill = progressBrush;
        var percentText = $"{Math.Round(usageRatio * 100):0}%";
        TokenUsagePercentText.Text = percentText;
        TokenUsageSummaryText.Text = $"컨텍스트 {percentText}";
        TokenUsageHintText.Text = $"{Services.TokenEstimator.Format(currentTokens)} / {Services.TokenEstimator.Format(maxContextTokens)}";
        CompactNowLabel.Text = compactLabel;

        if (TokenUsagePopupTitle != null)
            TokenUsagePopupTitle.Text = $"컨텍스트 창 {percentText}";
        if (TokenUsagePopupUsage != null)
            TokenUsagePopupUsage.Text = $"{Services.TokenEstimator.Format(currentTokens)}/{Services.TokenEstimator.Format(maxContextTokens)}";
        if (TokenUsagePopupDetail != null)
            TokenUsagePopupDetail.Text = _pendingPostCompaction ? "compact 후 첫 응답 대기 중" : $"자동 압축 시작 {triggerPercent}%";
        if (TokenUsagePopupCompact != null)
            TokenUsagePopupCompact.Text = "AX Agent가 컨텍스트를 자동으로 관리합니다";

        TokenUsageCard.ToolTip = null;

        UpdateCircularUsageArc(TokenUsageArc, usageRatio, 14, 14, 11);
        PositionThresholdMarker(TokenUsageThresholdMarker, triggerRatio, 14, 14, 11, 2.5);
    }

    private void TokenUsageCard_MouseEnter(object sender, MouseEventArgs e)
    {
        _tokenUsagePopupCloseTimer.Stop();
        if (TokenUsagePopup != null && TokenUsageCard?.Visibility == Visibility.Visible)
            TokenUsagePopup.IsOpen = true;
    }

    private void TokenUsageCard_MouseLeave(object sender, MouseEventArgs e)
    {
        _tokenUsagePopupCloseTimer.Stop();
        _tokenUsagePopupCloseTimer.Start();
    }

    private void TokenUsagePopup_MouseEnter(object sender, MouseEventArgs e)
    {
        _tokenUsagePopupCloseTimer.Stop();
    }

    private void TokenUsagePopup_MouseLeave(object sender, MouseEventArgs e)
    {
        _tokenUsagePopupCloseTimer.Stop();
        _tokenUsagePopupCloseTimer.Start();
    }

    private void CloseTokenUsagePopupIfIdle()
    {
        if (TokenUsagePopup == null)
            return;

        var cardHovered = IsMouseInsideElement(TokenUsageCard);
        var popupHovered = TokenUsagePopup.Child is FrameworkElement popupChild && IsMouseInsideElement(popupChild);
        if (!cardHovered && !popupHovered)
            TokenUsagePopup.IsOpen = false;
    }

    private static bool IsMouseInsideElement(FrameworkElement? element)
    {
        if (element == null || !element.IsVisible || element.ActualWidth <= 0 || element.ActualHeight <= 0)
            return false;

        try
        {
            var mouse = System.Windows.Forms.Control.MousePosition;
            var point = element.PointFromScreen(new Point(mouse.X, mouse.Y));
            return point.X >= 0 && point.Y >= 0 && point.X <= element.ActualWidth && point.Y <= element.ActualHeight;
        }
        catch
        {
            return element.IsMouseOver;
        }
    }
}