using System;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Effects;
using Microsoft.Data.Sqlite;
using Xunit;
using Xunit.Sdk;
using ytLive.Controls;
using ytLive.Models;
using ytLive.Services;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>The hole that let two regressions reach the creator on 2026-10-30: the Socials drawer's
/// appearance controls were tested against the RENDERER, while the preview is its own XAML tree —
/// so a control could paint nothing, or hide the bar entirely, with every test green.
///
/// <para>This drives the real drawer on a real MainWindow and reads the real preview elements:
/// the bar stays visible when the plate is off, the text colour reaches the glyphs, the plate
/// carries its colour and opacity, the shadow switches on, and Cancel restores the pre-edit
/// look.</para></summary>
[Collection("RealApp")]
public class SocialsPreviewTests
{
    private readonly RealAppHost _app;

    public SocialsPreviewTests(RealAppHost app) => _app = app;

    [Fact]
    public void The_preview_bar_follows_the_drawer_controls() => _app.Run(Run);

    private static void Run()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-socialspreview-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        MainWindow? window = null;

        try
        {
            var seeded = new SocialsConfig { BarEnabled = true };
            seeded.Entries.Add(new SocialEntry
            {
                Service = SocialService.YouTube, Handle = "creator",
                ProfileUrl = "https://youtube.com/@creator",
            });
            using (var store = new LayoutStore(tempDb))
                store.Save(Array.Empty<Scene>(), null, seeded);
            SqliteConnection.ClearAllPools();

            window = new MainWindow();
            var vm = (MainViewModel)window.DataContext!;
            window.Show();
            window.UpdateLayout();

            var preview = (PreviewPane)window.FindName("PreviewPane")!;
            var bar = (FrameworkElement)preview.FindName("SocialBarElement")!;
            var plate = FindChild<Border>(bar)!;
            var label = FindChild<TextBlock>(bar)!;

            Assert.Equal(Visibility.Visible, bar.Visibility);

            // 1. Drawer edits land on the preview live — no Save needed.
            vm.OpenSocialDialogCommand.Execute(null);
            var drawer = vm.SocialsDrawer!;
            drawer.BarTextColor = "#FF0000";
            window.UpdateLayout();
            Assert.Equal(Colors.Red, ((SolidColorBrush)label.Foreground).Color);

            // 2. Plate off (the default) = transparent plate, NOT a hidden bar.
            Assert.Equal(0, ((SolidColorBrush)plate.Background).Color.A);
            Assert.Equal(Visibility.Visible, bar.Visibility);

            drawer.BarBackgroundEnabled = true;
            drawer.BarBackgroundColor = "#0000FF";
            drawer.BarBackgroundOpacity = 0.5;
            window.UpdateLayout();
            var bg = ((SolidColorBrush)plate.Background).Color;
            Assert.Equal(Colors.Blue, Color.FromRgb(bg.R, bg.G, bg.B));
            Assert.InRange(bg.A, 120, 135);                       // 50% of 255
            Assert.Equal(new Thickness(18, 6, 18, 6), plate.Padding);

            // 3. The shadow is a real effect on the glyph, and off by default.
            Assert.Null(label.Effect);
            drawer.BarTextShadow = true;
            window.UpdateLayout();
            Assert.IsType<DropShadowEffect>(label.Effect);

            // 4. Cancel restores the pre-edit look (white text, no plate).
            drawer.CancelCommand.Execute(null);
            window.UpdateLayout();
            Assert.Equal(Colors.White, ((SolidColorBrush)label.Foreground).Color);
            Assert.Equal(0, ((SolidColorBrush)plate.Background).Color.A);
        }
        catch (Exception ex)
        {
            throw new XunitException(ex.ToString());   // the host otherwise hides the real stack
        }
        finally
        {
            window?.Close();
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best-effort */ }
        }
    }

    private static T? FindChild<T>(DependencyObject root) where T : DependencyObject
    {
        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(root); i++)
        {
            var child = VisualTreeHelper.GetChild(root, i);
            if (child is T match) return match;
            var deeper = FindChild<T>(child);
            if (deeper != null) return deeper;
        }
        return null;
    }
}