using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Effects;

namespace AxCopilot.Views;

/// <summary>
/// 도구 실행 승인을 위한 간결한 별도 다이얼로그 창.
/// PlanViewerV2(전체 계획 뷰어)와 분리하여 도구 단위 승인에 사용합니다.
/// </summary>
internal sealed class ToolApprovalWindow : Window
{
    private string? _result;

    private ToolApprovalWindow(string message, List<string> options)
    {
        Width = 500;
        MinWidth = 400;
        MaxWidth = 600;
        SizeToContent = SizeToContent.Height;
        WindowStartupLocation = WindowStartupLocation.CenterScreen;
        ResizeMode = ResizeMode.NoResize;
        WindowStyle = WindowStyle.None;
        AllowsTransparency = true;
        Background = Brushes.Transparent;
        ShowInTaskbar = false;
        Topmost = true;

        var bg = Application.Current.TryFindResource("LauncherBackground") as Brush
                 ?? new SolidColorBrush(Color.FromRgb(0x1A, 0x1B, 0x2E));
        var primary = Application.Current.TryFindResource("PrimaryText") as Brush ?? Brushes.White;
        var secondary = Application.Current.TryFindResource("SecondaryText") as Brush ?? Brushes.Gray;
        var accent = Application.Current.TryFindResource("AccentColor") as Brush
                     ?? new SolidColorBrush(Color.FromRgb(0x4B, 0x5E, 0xFC));
        var border = Application.Current.TryFindResource("BorderColor") as Brush ?? Brushes.Gray;
        var itemBg = Application.Current.TryFindResource("ItemBackground") as Brush
                     ?? new SolidColorBrush(Color.FromRgb(0x2A, 0x2B, 0x40));
        var errorBrush = Application.Current.TryFindResource("ErrorColor") as Brush
                         ?? new SolidColorBrush(Color.FromRgb(0xDC, 0x26, 0x26));
        var hoverBg = Application.Current.TryFindResource("ItemHoverBackground") as Brush
                      ?? new SolidColorBrush(Color.FromArgb(0x20, 0xFF, 0xFF, 0xFF));

        var root = new Border
        {
            Background = bg,
            BorderBrush = border,
            BorderThickness = new Thickness(1),
            CornerRadius = new CornerRadius(14),
            Padding = new Thickness(20, 16, 20, 16),
            Effect = new DropShadowEffect
            {
                BlurRadius = 20,
                ShadowDepth = 4,
                Opacity = 0.35,
                Color = Colors.Black,
            },
        };

        var stack = new StackPanel();

        // Header
        var header = new Grid { Margin = new Thickness(0, 0, 0, 12) };
        header.MouseLeftButtonDown += (_, _) => { try { DragMove(); } catch { } };
        header.Children.Add(new StackPanel
        {
            Orientation = Orientation.Horizontal,
            Children =
            {
                new TextBlock
                {
                    Text = "\uE946", // Shield icon
                    FontFamily = new FontFamily("Segoe MDL2 Assets"),
                    FontSize = 15,
                    Foreground = accent,
                    Margin = new Thickness(0, 0, 8, 0),
                    VerticalAlignment = VerticalAlignment.Center,
                },
                new TextBlock
                {
                    Text = "실행 확인",
                    FontSize = 13.5,
                    FontWeight = FontWeights.SemiBold,
                    Foreground = primary,
                    VerticalAlignment = VerticalAlignment.Center,
                }
            }
        });

        // Close button
        var close = new Border
        {
            Width = 26,
            Height = 26,
            CornerRadius = new CornerRadius(7),
            Background = Brushes.Transparent,
            Cursor = Cursors.Hand,
            HorizontalAlignment = HorizontalAlignment.Right,
            VerticalAlignment = VerticalAlignment.Center,
            Child = new TextBlock
            {
                Text = "\uE8BB",
                FontFamily = new FontFamily("Segoe MDL2 Assets"),
                FontSize = 10,
                Foreground = secondary,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            },
        };
        close.MouseLeftButtonUp += (_, _) => { _result = "취소"; Close(); };
        close.MouseEnter += (_, _) => close.Background = hoverBg;
        close.MouseLeave += (_, _) => close.Background = Brushes.Transparent;
        header.Children.Add(close);
        stack.Children.Add(header);

        // Message content
        var msgBorder = new Border
        {
            Background = itemBg,
            CornerRadius = new CornerRadius(12),
            Padding = new Thickness(14, 11, 14, 11),
            Margin = new Thickness(0, 0, 0, 14),
        };

        var msgText = new TextBlock
        {
            Text = message,
            FontSize = 13,
            FontFamily = new FontFamily("Segoe UI"),
            Foreground = primary,
            TextWrapping = TextWrapping.Wrap,
            LineHeight = 20,
        };
        msgBorder.Child = msgText;
        stack.Children.Add(msgBorder);

        // Buttons
        var btnPanel = new StackPanel
        {
            Orientation = Orientation.Horizontal,
            HorizontalAlignment = HorizontalAlignment.Right,
        };

        foreach (var option in options)
        {
            var btn = CreateOptionButton(option, primary, secondary, accent, bg, errorBrush);
            btn.MouseLeftButtonUp += (_, _) => { _result = option; Close(); };
            btnPanel.Children.Add(btn);
        }
        stack.Children.Add(btnPanel);

        root.Child = stack;
        Content = root;

        // Entrance animation
        root.Opacity = 0;
        root.RenderTransformOrigin = new Point(0.5, 0.5);
        root.RenderTransform = new ScaleTransform(0.96, 0.96);
        Loaded += (_, _) =>
        {
            root.BeginAnimation(OpacityProperty, new DoubleAnimation(0, 1, TimeSpan.FromMilliseconds(140)));
            var sx = new DoubleAnimation(0.96, 1, TimeSpan.FromMilliseconds(180))
            {
                EasingFunction = new QuadraticEase { EasingMode = EasingMode.EaseOut },
            };
            var sy = new DoubleAnimation(0.96, 1, TimeSpan.FromMilliseconds(180))
            {
                EasingFunction = new QuadraticEase { EasingMode = EasingMode.EaseOut },
            };
            ((ScaleTransform)root.RenderTransform).BeginAnimation(ScaleTransform.ScaleXProperty, sx);
            ((ScaleTransform)root.RenderTransform).BeginAnimation(ScaleTransform.ScaleYProperty, sy);
        };

        // ESC to cancel
        KeyDown += (_, e) =>
        {
            if (e.Key == Key.Escape)
            {
                _result = "취소";
                Close();
            }
        };
    }

    private Border CreateOptionButton(string label, Brush primary, Brush secondary, Brush accent, Brush bg, Brush errorBrush)
    {
        Brush foreground, background, borderBrush;
        switch (label)
        {
            case "확인":
            case "승인":
                foreground = Brushes.White;
                background = accent;
                borderBrush = accent;
                break;
            case "취소":
            case "중단":
                foreground = errorBrush;
                background = Brushes.Transparent;
                borderBrush = errorBrush;
                break;
            default:
                foreground = primary;
                background = Brushes.Transparent;
                borderBrush = secondary;
                break;
        }

        var isDestructive = label == "취소" || label == "중단";

        // Build inner content: optional left accent bar + label
        FrameworkElement child;
        if (isDestructive)
        {
            var grid = new Grid();
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto });
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            var accentBar = new Border
            {
                Width = 4,
                CornerRadius = new CornerRadius(2),
                Background = errorBrush,
                Margin = new Thickness(0, 4, 8, 4),
                VerticalAlignment = VerticalAlignment.Stretch,
            };
            Grid.SetColumn(accentBar, 0);
            grid.Children.Add(accentBar);
            var txt = new TextBlock
            {
                Text = label,
                FontSize = 12,
                FontWeight = FontWeights.SemiBold,
                Foreground = foreground,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
            Grid.SetColumn(txt, 1);
            grid.Children.Add(txt);
            child = grid;
        }
        else
        {
            child = new TextBlock
            {
                Text = label,
                FontSize = 12,
                FontWeight = FontWeights.SemiBold,
                Foreground = foreground,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
            };
        }

        var btn = new Border
        {
            MinWidth = 84,
            Height = 36,
            CornerRadius = new CornerRadius(10),
            Background = background,
            BorderBrush = borderBrush,
            BorderThickness = new Thickness(1),
            Padding = new Thickness(14, 0, 14, 0),
            Margin = new Thickness(10, 0, 0, 0),
            Cursor = Cursors.Hand,
            Child = child,
        };

        btn.MouseEnter += (_, _) => btn.Opacity = 0.85;
        btn.MouseLeave += (_, _) => btn.Opacity = 1.0;

        return btn;
    }

    /// <summary>도구 승인 다이얼로그를 표시하고 결과를 반환합니다.</summary>
    internal static string? Show(Window? owner, string message, List<string> options)
        => Show(owner, message, options, CancellationToken.None);

    /// <summary>
    /// 도구 승인 다이얼로그를 표시합니다. cancellationToken이 트리거되면 창을 자동으로 닫고 null을 반환합니다.
    /// 장시간 미응답 시 타임아웃으로 에이전트 루프가 멈추는 것을 방지하기 위해 사용합니다.
    /// </summary>
    internal static string? Show(Window? owner, string message, List<string> options, CancellationToken cancellationToken)
    {
        var dialog = new ToolApprovalWindow(message, options);
        if (owner != null && IsWindowAlive(owner))
        {
            dialog.WindowStartupLocation = WindowStartupLocation.CenterOwner;
            dialog.Owner = owner;
        }

        CancellationTokenRegistration reg = default;
        if (cancellationToken.CanBeCanceled)
        {
            reg = cancellationToken.Register(() =>
            {
                // UI 스레드에서 안전하게 닫기
                dialog.Dispatcher.BeginInvoke(new Action(() =>
                {
                    try { if (dialog.IsVisible) dialog.Close(); }
                    catch { /* 이미 닫혀있거나 파괴 중 — 무시 */ }
                }));
            });
        }

        try
        {
            dialog.ShowDialog();
        }
        finally
        {
            reg.Dispose();
        }

        return dialog._result;
    }

    private static bool IsWindowAlive(Window? w)
    {
        if (w == null) return false;
        try { var _ = w.IsVisible; return true; }
        catch { return false; }
    }
}