using System;
using System.Windows;
using Microsoft.Data.Sqlite;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Threading;
using Xunit;
using ytLive.Controls;
using ytLive.Models;
using ytLive.Services.Entitlement;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>
/// The About overlay is the in-app creator hub: it opens from the real window,
/// and its licensing sub-panel surfaces the full THIRD-PARTY-NOTICES.txt
/// in-app (scrolling text, never the OS viewer / Notepad). Drives the real VM
/// through the real window — same real-App + temp-DB pattern as the round-clip
/// and source-naming tests.
/// </summary>
[Collection("RealApp")]
public sealed class AboutHubTests
{
    private readonly RealAppHost _app;

    public AboutHubTests(RealAppHost app)
    {
        _app = app;
    }

    [Fact]
    public void About_Opens_InApp_Licensing_Loads_Shipped_Notices()
    {
        _app.Run(Run);
    }

    private void Run()
    {
        var tempDb = System.IO.Path.Combine(System.IO.Path.GetTempPath(), $"ytLlive-about-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        var window = new MainWindow();
        var vm = (MainViewModel)window.DataContext;
        try
        {
            // About hub opens (the wordmark / gear menu entry point).
            vm.OpenAboutCommand.Execute(null);
            Assert.True(vm.IsAboutOpen);
            Assert.False(vm.IsLicensesOpen);

            // The hub links resolve to real destinations.
            Assert.Equal("https://youtube.com/@llamachileshop", MainViewModel.ChannelUrl);
            Assert.Equal("https://mastodon.llamachile.tube/@gramps", MainViewModel.MastodonUrl);
            Assert.Equal("https://buymeacoffee.com/llamachiley", MainViewModel.CoffeeUrl);
            Assert.Equal("https://llamacasty.com", MainViewModel.PremiumUrl);

            // The licensing panel loads the full shipped notices text in-app.
            vm.OpenLicensesCommand.Execute(null);
            Assert.True(vm.IsLicensesOpen);
            Assert.False(string.IsNullOrWhiteSpace(vm.LicensesText));
            Assert.Contains("Third-Party Notices", vm.LicensesText, StringComparison.OrdinalIgnoreCase);
            Assert.Contains("LGPL", vm.LicensesText, StringComparison.OrdinalIgnoreCase);

            // Back returns to the hub view (code-behind click handler path is
            // equivalent; here we assert the VM contract the handler uses).
            vm.IsLicensesOpen = false;
            Assert.True(vm.IsAboutOpen);
        }
        finally
        {
            window.Close();
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { System.IO.File.Delete(tempDb); } catch { /* best-effort cleanup */ }
        }
    }

    /// <summary>
    /// The About box is a conversion surface (creator, 2026-11-05): a large logo, the 1-2-3 tagline,
    /// the offer, one primary CTA with the price on it — and a paying customer sees none of the price.
    /// </summary>
    [Fact]
    public void About_ShowsTheOfferToFreeUsers_AndNothingToSellToOwners()
    {
        _app.Run(() =>
        {
            var tempDb = Path.Combine(Path.GetTempPath(), $"llamacasty-about-{Guid.NewGuid():N}.db");
            MainViewModel.LayoutPathOverride = tempDb;
            MainWindow? window = null;
            try
            {
                window = new MainWindow();
                var vm = (MainViewModel)window.DataContext;
                vm.EntitlementOverride = new FakeEntitlement(false, "Steam licensing is not configured in this build.");
                window.Show();
                vm.OpenAboutCommand.Execute(null);
                window.UpdateLayout();

                var badge = FindVisualChildByName<Button>(window, "ReleaseBadgeButton");
                Assert.NotNull(badge);
                Assert.Equal("Pre-Release", badge!.Content);
                Assert.NotNull(badge.Command);   // the badge links out until the Steam page exists

                var tagline = FindVisualChildByName<TextBlock>(window, "AboutTagline");
                Assert.NotNull(tagline);
                Assert.Equal("1-2-3, and go live to the world on YouTube!", tagline!.Text);
                // The old line insulted the creator and is gone for good.
                Assert.DoesNotContain("right-brained", TextOf(window));

                var price = FindVisualChildByName<TextBlock>(window, "AboutPriceLine");
                Assert.Equal("Launch price $79", price!.Text);

                var cta = FindVisualChildByName<Button>(window, "UpgradeCtaButton");
                Assert.NotNull(cta);
                Assert.Equal("Unlock 60 fps — $79", cta!.Content);
                var upgradeBlock = FindVisualChildByName<StackPanel>(window, "UpgradeBlock");
                Assert.Equal(Visibility.Visible, upgradeBlock!.Visibility);

                var copyright = FindVisualChildByName<TextBlock>(window, "AboutCopyright");
                Assert.Equal($"© {DateTime.Now.Year} Llama Chile Shop", copyright!.Text);
                Assert.DoesNotContain("Made by gramps", TextOf(window));

                // A paying customer is never sold to.
                vm.EntitlementOverride = new FakeEntitlement(true);
                window.UpdateLayout();
                Assert.Equal(Visibility.Collapsed, FindVisualChildByName<StackPanel>(window, "UpgradeBlock")!.Visibility);
                var owned = FindVisualChildByName<TextBlock>(window, "OwnedStateText");
                Assert.Equal(Visibility.Visible, owned!.Visibility);
                Assert.Contains("owned", owned.Text, StringComparison.OrdinalIgnoreCase);
            }
            finally
            {
                window?.Close();
                MainViewModel.LayoutPathOverride = null;
                SqliteConnection.ClearAllPools();
                try { File.Delete(tempDb); } catch { /* best-effort cleanup */ }
            }
        });
    }

    [Fact]
    public void Free_user_gets_1080p30_and_cannot_select_or_change_to_60fps()
    {
        _app.Run(() =>
        {
            var tempDb = System.IO.Path.Combine(System.IO.Path.GetTempPath(), $"llamacasty-upgrade-{Guid.NewGuid():N}.db");
            MainViewModel.LayoutPathOverride = tempDb;
            MainWindow? window = null;
            try
            {
                window = new MainWindow();
                var vm = (MainViewModel)window.DataContext;
                vm.EntitlementOverride = new FakeEntitlement(false,
                    "Steam could not verify ownership. Open Steam, sign in, then restart LlamaCasty.");
                window.Show();
                window.UpdateLayout();

                var freeTier = vm.QualityOptions.Single(option => option.Display == "1080p30");
                var lockedTier = vm.QualityOptions.First(option => option.Fps == 60);
                Assert.Same(freeTier, vm.SelectedQuality);

                // The old red panel under the quality picker is gone (2026-11-05): the licence state
                // lives in the left panel's alert stack now, as a pinned status indicator.
                Assert.Null(window.FindName("EntitlementErrorPanel"));
                var licenceRow = vm.AttentionAlerts.Single(alert => alert.Id == "steam-licence");
                Assert.True(licenceRow.IsPinned);
                Assert.Contains("Steam ID Limit: 30fps", licenceRow.Text);
                Assert.Contains("Click for More Info", licenceRow.Text);

                var picker = (ComboBox)window.FindName("QualityPicker");
                Assert.True(vm.CanChangeQuality);
                Assert.True(picker.IsEnabled);
                picker.IsDropDownOpen = true;
                picker.UpdateLayout();
                Dispatcher.CurrentDispatcher.Invoke(() => { }, DispatcherPriority.Loaded);

                var lockedItem = (ComboBoxItem)picker.ItemContainerGenerator.ContainerFromItem(lockedTier)!;
                Assert.False(lockedItem.IsEnabled);
                var struckText = FindVisualChild<TextBlock>(lockedItem);
                Assert.NotNull(struckText);
                Assert.Contains(struckText!.TextDecorations, decoration =>
                    decoration.Location == TextDecorationLocation.Strikethrough);

                picker.SelectedItem = lockedTier;
                picker.UpdateLayout();

                Assert.Same(freeTier, vm.SelectedQuality);
                Assert.False(vm.IsAboutOpen);

                picker.IsDropDownOpen = false;
                vm.IsRecording = true;
                window.UpdateLayout();
                Assert.False(vm.CanChangeQuality);
                Assert.False(picker.IsEnabled);
                vm.SelectedQuality = vm.QualityOptions.Single(option => option.Display == "720p30");
                Assert.Same(freeTier, vm.SelectedQuality);

                vm.IsRecording = false;
                vm.StreamStatus = StreamStatus.Streaming;
                window.UpdateLayout();
                Assert.False(vm.CanChangeQuality);
                Assert.False(picker.IsEnabled);
                vm.SelectedQuality = vm.QualityOptions.Single(option => option.Display == "720p30");
                Assert.Same(freeTier, vm.SelectedQuality);

                vm.StreamStatus = StreamStatus.Offline;
                Assert.True(vm.CanChangeQuality);
                Assert.True(picker.IsEnabled);
            }
            finally
            {
                window?.Close();
                MainViewModel.LayoutPathOverride = null;
                SqliteConnection.ClearAllPools();
                try { System.IO.File.Delete(tempDb); } catch { /* best-effort cleanup */ }
            }
        });
    }

    private static T? FindVisualChildByName<T>(DependencyObject parent, string name) where T : DependencyObject
    {
        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            if (child is FrameworkElement element && element.Name == name && child is T typed) return typed;
            if (FindVisualChildByName<T>(child, name) is { } found) return found;
        }
        return null;
    }

    /// <summary>Every TextBlock string in the tree — for asserting that removed copy is really gone.</summary>
    private static string TextOf(DependencyObject parent)
    {
        var text = new System.Text.StringBuilder();
        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            if (child is TextBlock block) text.Append(block.Text).Append('\n');
            text.Append(TextOf(child));
        }
        return text.ToString();
    }

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