using System.Text.Json;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Threading;

namespace AxCopilot.Services.Agent;

/// <summary>
/// Windows 알림 전송 도구.
/// 장시간 작업 완료 알림, 사용자 확인 요청 등을 트레이 또는 앱 내 토스트로 표시합니다.
/// </summary>
public class NotifyTool : IAgentTool
{
    public string Name => "notify_tool";
    public string Description =>
        "Send a notification to the user. Use this when: " +
        "a long-running task completes, an important result needs attention, " +
        "or you want to inform the user of something. " +
        "The notification appears as an in-app toast message.";

    public ToolParameterSchema Parameters => new()
    {
        Properties = new()
        {
            ["title"] = new()
            {
                Type = "string",
                Description = "Notification title (short, 1-2 words)",
            },
            ["message"] = new()
            {
                Type = "string",
                Description = "Notification message (detail text)",
            },
            ["level"] = new()
            {
                Type = "string",
                Description = "Notification level: info (default), success, warning, error",
                Enum = ["info", "success", "warning", "error"],
            },
        },
        Required = ["title", "message"],
    };

    public async Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct = default)
    {
        var title   = args.GetProperty("title").GetString() ?? "알림";
        var message = args.GetProperty("message").GetString() ?? "";
        var level   = args.TryGetProperty("level", out var lv) ? lv.GetString() ?? "info" : "info";

        try
        {
            // InvokeAsync로 변경 — Dispatcher.Invoke는 UI 스레드가 _convLock 대기 중일 때 데드락 발생
            await Application.Current.Dispatcher.InvokeAsync(() =>
            {
                ShowToast(title, message, level);
            });
            return ToolResult.Ok($"✓ Notification sent: [{level}] {title}");
        }
        catch (Exception ex)
        {
            return ToolResult.Fail($"알림 전송 실패: {ex.Message}");
        }
    }

    private static void ShowToast(string title, string message, string level)
    {
        var mainWindow = Application.Current.MainWindow;
        if (mainWindow == null) return;

        var (iconChar, iconColor) = level switch
        {
            "success" => ("\uE73E", "#34D399"),
            "warning" => ("\uE7BA", "#F59E0B"),
            "error"   => ("\uEA39", "#F87171"),
            _         => ("\uE946", "#4B5EFC"), // info
        };

        var toast = new Border
        {
            Background   = new SolidColorBrush(Color.FromRgb(0x1A, 0x1B, 0x2E)),
            CornerRadius = new CornerRadius(10),
            Padding      = new Thickness(16, 12, 16, 12),
            Margin       = new Thickness(0, 0, 20, 20),
            MinWidth     = 280,
            MaxWidth     = 400,
            HorizontalAlignment = HorizontalAlignment.Right,
            VerticalAlignment   = VerticalAlignment.Bottom,
            Effect = new System.Windows.Media.Effects.DropShadowEffect
            {
                BlurRadius  = 16,
                ShadowDepth = 4,
                Opacity     = 0.4,
                Color       = Colors.Black,
            },
        };

        var content = new StackPanel();

        // 타이틀 행
        var titleRow = new StackPanel { Orientation = Orientation.Horizontal, Margin = new Thickness(0, 0, 0, 4) };
        titleRow.Children.Add(new TextBlock
        {
            Text       = iconChar,
            FontFamily = new FontFamily("Segoe MDL2 Assets"),
            FontSize   = 14,
            Foreground = new SolidColorBrush((Color)ColorConverter.ConvertFromString(iconColor)),
            Margin     = new Thickness(0, 0, 8, 0),
            VerticalAlignment = VerticalAlignment.Center,
        });
        titleRow.Children.Add(new TextBlock
        {
            Text       = title,
            FontSize   = 13,
            FontWeight = FontWeights.SemiBold,
            Foreground = Brushes.White,
            VerticalAlignment = VerticalAlignment.Center,
        });
        content.Children.Add(titleRow);

        // 메시지
        if (!string.IsNullOrEmpty(message))
        {
            content.Children.Add(new TextBlock
            {
                Text         = message.Length > 200 ? message[..200] + "..." : message,
                FontSize     = 12,
                Foreground   = new SolidColorBrush(Color.FromRgb(0xAA, 0xAA, 0xCC)),
                TextWrapping = TextWrapping.Wrap,
            });
        }

        toast.Child = content;

        // 기존 Grid/Panel에 추가
        if (mainWindow.Content is Grid grid)
        {
            Grid.SetRowSpan(toast, grid.RowDefinitions.Count > 0 ? grid.RowDefinitions.Count : 1);
            Grid.SetColumnSpan(toast, grid.ColumnDefinitions.Count > 0 ? grid.ColumnDefinitions.Count : 1);
            grid.Children.Add(toast);

            // 5초 후 자동 제거 (페이드 아웃)
            var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(5) };
            timer.Tick += (_, _) =>
            {
                timer.Stop();
                grid.Children.Remove(toast);
            };
            timer.Start();
        }
    }
}