using System.Collections.Generic;
using System.Linq;
using Xunit;
using ytLive.Models;

namespace ytLive.Tests;

/// <summary>Creator ruling (2026-10-30): the Scoreboard layer — YT_ACTIVITY_TICKER — is AVAILABLE TO
/// ALL SCENES. It therefore heals into every scene like the Background and Brand logo, and a scene
/// can never end up with two of them.</summary>
public class ScoreboardHealerTests
{
    private static Scene SceneWith(string name)
    {
        var scene = new Scene { Name = name };
        scene.Elements.Add(new Source { Name = "Background", Type = SourceType.Background, IsBackground = true });
        scene.Elements.Add(new Source { Name = "Brand logo", Type = SourceType.Image, IsBrandLogo = true });
        return scene;
    }

    [Fact]
    public void Every_scene_gets_exactly_one_scoreboard_below_the_background()
    {
        var scenes = new List<Scene>
        {
            SceneWith(SceneCatalog.Starting), SceneWith(SceneCatalog.Live), SceneWith(SceneCatalog.Brb),
        };

        Assert.True(ScoreboardHealer.Ensure(scenes));
        foreach (var scene in scenes)
        {
            var boards = scene.Elements.OfType<Source>().Where(s => s.IsScoreboard).ToList();
            Assert.Single(boards);
            Assert.Equal("Scoreboard", boards[0].Name);
            Assert.Equal(0, boards[0].X);
            Assert.Equal(1920, boards[0].Width);
            Assert.Equal(ScoreboardHealer.StripHeight, boards[0].Height);
            // Topmost: a full-width strip over the scene, and the Brand logo keeps its documented
            // place directly above the background.
            Assert.Equal(scene.Elements.Count - 1, scene.Elements.IndexOf(boards[0]));
            Assert.Equal("Brand logo", scene.Elements[1].Name);
        }

        // Idempotent: a second pass changes nothing (no duplicate strips, no churn).
        Assert.False(ScoreboardHealer.Ensure(scenes));
        foreach (var scene in scenes) Assert.Single(scene.Elements.OfType<Source>().Where(s => s.IsScoreboard));

        // A scene that somehow has two is healed back to one.
        scenes[0].Elements.Add(new Source { Name = "Scoreboard2", Type = SourceType.Scoreboard });
        Assert.True(ScoreboardHealer.Ensure(scenes));
        Assert.Single(scenes[0].Elements.OfType<Source>().Where(s => s.IsScoreboard));
    }
}