using System;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Data.Sqlite;
using Xunit;
using ytLive.Controls;
using ytLive.Models;
using ytLive.ViewModels;

namespace ytLive.Tests;

[Collection("RealApp")]
public sealed class TextLayerDropdownTests
{
    private readonly RealAppHost _app;

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

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

    private static void Run()
    {
        var dbPath = Path.Combine(Path.GetTempPath(), $"ytLlive-text-controls-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = dbPath;
        MainWindow? window = null;
        try
        {
            window = new MainWindow();
            var vm = (MainViewModel)window.DataContext;
            vm.EditingActive = true;
            vm.StagedScene = vm.Scenes.Single(scene => SceneCatalog.Is(scene.Name, SceneCatalog.Live));
            vm.AddSourceCommand.Execute(SourceType.TextOverlay);
            var source = vm.StagedScene!.Elements.OfType<Source>()
                .Single(item => item.Type == SourceType.TextOverlay);
            vm.SelectedElement = source;

            window.Show();
            window.UpdateLayout();

            var panel = (LeftPanel)window.FindName("LeftPanel")!;
            var fontType = (ComboBox)panel.FindName("TextLayerFontTypePicker")!;
            var font = (ComboBox)panel.FindName("TextLayerFontPicker")!;
            var size = (ComboBox)panel.FindName("TextLayerSizePicker")!;
            var colorField = (TextBox)panel.FindName("TextLayerColorEditor")!;
            var color = (ComboBox)panel.FindName("TextLayerColorPicker")!;
            var horizontal = (ComboBox)panel.FindName("TextLayerHorizontalAlignmentPicker")!;
            var vertical = (ComboBox)panel.FindName("TextLayerVerticalAlignmentPicker")!;

            Assert.Equal("Sans Serif", fontType.SelectedItem);
            Assert.Equal("Sans Serif", fontType.Text);
            Assert.Equal("Segoe UI", font.SelectedItem);
            Assert.Equal("Segoe UI", font.Text);
            Assert.Equal(48d, size.SelectedItem);
            Assert.Equal("48", size.Text);
            Assert.Equal("#FFFFFF", colorField.Text);
            Assert.Equal(source.TextColorEntry, color.SelectedItem);
            Assert.Equal(TextLayerAlignment.Left, horizontal.SelectedItem);
            Assert.Equal("Left", horizontal.Text);
            Assert.Equal(TextLayerVerticalAlignment.Top, vertical.SelectedItem);
            Assert.Equal("Top", vertical.Text);

            Assert.Same(Application.Current.Resources["YtComboBox"], color.Style);
            Assert.Same(panel.Resources["BorderColorTemplates"], color.ItemTemplateSelector);
            Assert.Equal(10, ((FrameworkElement)fontType.Parent).Margin.Left);
            Assert.Equal(10, ((FrameworkElement)color.Parent).Margin.Left);
            Assert.Equal(10, ((FrameworkElement)horizontal.Parent).Margin.Left);
            Assert.Equal(10, ((FrameworkElement)vertical.Parent).Margin.Left);

            fontType.SelectedItem = "Serif";
            window.UpdateLayout();
            Assert.Equal("Serif", vm.SelectedTextFontType);
            Assert.Equal("Segoe UI", source.TextFontFamily);
            Assert.NotEmpty(font.Items);
            var serifFont = font.Items.Cast<string>().First();
            font.SelectedItem = serifFont;
            size.SelectedItem = 36d;
            color.SelectedItem = source.TextColorOptions.Single(item => item.Hex == "#FF0000");
            horizontal.SelectedItem = TextLayerAlignment.Center;
            vertical.SelectedItem = TextLayerVerticalAlignment.Bottom;
            window.UpdateLayout();

            Assert.Equal(serifFont, source.TextFontFamily);
            Assert.Equal(36, source.TextFontSize);
            Assert.Equal("#FF0000", source.TextColor);
            Assert.Equal(TextLayerAlignment.Center, source.TextAlignment);
            Assert.Equal(TextLayerVerticalAlignment.Bottom, source.TextVerticalAlignment);
            var raster = Assert.IsType<ytLive.Services.VideoFrame>(vm.ResolveOutputFrame(source));
            Assert.True(FirstInkRow(raster) > 50,
                "bottom alignment did not place the text lower inside its box");
            Assert.Equal("Serif", fontType.SelectedItem);
            Assert.Equal(serifFont, font.SelectedItem);
            Assert.Equal(serifFont, font.Text);
            Assert.Equal(36d, size.SelectedItem);
            Assert.Equal("36", size.Text);
            Assert.Equal("#FF0000", colorField.Text);
            Assert.Equal(source.TextColorEntry, color.SelectedItem);
            Assert.Equal(TextLayerAlignment.Center, horizontal.SelectedItem);
            Assert.Equal("Center", horizontal.Text);
            Assert.Equal(TextLayerVerticalAlignment.Bottom, vertical.SelectedItem);
            Assert.Equal("Bottom", vertical.Text);

            vm.SaveLayoutNow();
            window.Close();
            window = null;
            SqliteConnection.ClearAllPools();

            window = new MainWindow();
            var reloadedVm = (MainViewModel)window.DataContext;
            reloadedVm.EditingActive = true;
            reloadedVm.StagedScene = reloadedVm.Scenes.Single(scene => SceneCatalog.Is(scene.Name, SceneCatalog.Live));
            var reloaded = reloadedVm.StagedScene.Elements.OfType<Source>()
                .Single(item => item.Type == SourceType.TextOverlay);
            reloadedVm.SelectedElement = reloaded;
            window.Show();
            window.UpdateLayout();

            var reloadedPanel = (LeftPanel)window.FindName("LeftPanel")!;
            Assert.Equal(reloadedVm.SelectedTextFontType, ((ComboBox)reloadedPanel.FindName("TextLayerFontTypePicker")!).SelectedItem);
            Assert.Equal(reloaded.TextFontFamily, ((ComboBox)reloadedPanel.FindName("TextLayerFontPicker")!).SelectedItem);
            Assert.Equal(reloaded.TextFontFamily, ((ComboBox)reloadedPanel.FindName("TextLayerFontPicker")!).Text);
            Assert.Equal(reloaded.TextFontSize, ((ComboBox)reloadedPanel.FindName("TextLayerSizePicker")!).SelectedItem);
            Assert.Equal(reloaded.TextFontSize.ToString(), ((ComboBox)reloadedPanel.FindName("TextLayerSizePicker")!).Text);
            Assert.Equal(reloaded.TextColor, ((TextBox)reloadedPanel.FindName("TextLayerColorEditor")!).Text);
            Assert.Equal(reloaded.TextColorEntry, ((ComboBox)reloadedPanel.FindName("TextLayerColorPicker")!).SelectedItem);
            Assert.Equal(reloaded.TextAlignment, ((ComboBox)reloadedPanel.FindName("TextLayerHorizontalAlignmentPicker")!).SelectedItem);
            Assert.Equal(reloaded.TextAlignment.ToString(), ((ComboBox)reloadedPanel.FindName("TextLayerHorizontalAlignmentPicker")!).Text);
            Assert.Equal(reloaded.TextVerticalAlignment, ((ComboBox)reloadedPanel.FindName("TextLayerVerticalAlignmentPicker")!).SelectedItem);
            Assert.Equal(reloaded.TextVerticalAlignment.ToString(), ((ComboBox)reloadedPanel.FindName("TextLayerVerticalAlignmentPicker")!).Text);
        }
        finally
        {
            window?.Close();
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(dbPath); } catch { /* best-effort cleanup */ }
        }
    }

    private static int FirstInkRow(ytLive.Services.VideoFrame frame)
    {
        for (var y = 0; y < frame.Height; y++)
            for (var x = 0; x < frame.Width; x++)
                if (frame.BgraPixels[(y * frame.Width + x) * 4 + 3] > 0)
                    return y;
        return frame.Height;
    }
}