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

namespace ytLive.Tests;

/// <summary>
/// TASK 65 slice 5 — the replay layer as a thing the creator can add, and the one guard that matters.
///
/// <para>The layer is an ordinary media layer with an app-owned path, so the test only has to prove the
/// flags: one per scene, silent by default, once-through in Live and looping everywhere else. Playback
/// itself rides the media manager that TASK 21 already covers.</para>
/// </summary>
[Collection("RealApp")]
public sealed class ReplayLayerTests
{
    private readonly RealAppHost _app;

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

    [Fact]
    public void AddReplayLayer_IsOnePerScene_SilentByDefault_AndLoopsOutsideLive() => _app.Run(() =>
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-replay-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        try
        {
            var vm = new MainViewModel();

            vm.StagedScene = vm.Scenes.Single(s => SceneCatalog.Is(s.Name, SceneCatalog.Live));
            vm.AddReplayLayer();
            vm.AddReplayLayer();                     // second add is a no-op

            var layers = vm.Scenes.SelectMany(s => s.Elements).OfType<Source>()
                .Where(s => s.IsReplayLayer).ToList();
            Assert.Single(layers);

            var liveLayer = layers[0];
            Assert.True(liveLayer.MediaMuted);       // silent by default
            Assert.False(liveLayer.MediaIsLooping);  // Live plays once

            // Any other scene loops the kept set.
            vm.StagedScene = vm.Scenes.Single(s => SceneCatalog.Is(s.Name, SceneCatalog.Brb));
            vm.AddReplayLayer();
            var brbLayer = vm.Scenes.SelectMany(s => s.Elements).OfType<Source>()
                .Single(s => s.IsReplayLayer && s != liveLayer);
            Assert.True(brbLayer.MediaIsLooping);
            Assert.True(brbLayer.MediaMuted);

            // Clips off by default, and with no ring nothing is written by a stray F10.
            Assert.False(vm.ClipsEnabled);
            vm.SaveReplayClip();
            var clipsFolder = Path.Combine(Path.GetDirectoryName(tempDb)!, "clips");
            Assert.False(Directory.Exists(clipsFolder) && Directory.EnumerateFiles(clipsFolder).Any());
        }
        finally
        {
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best effort */ }
        }
    });
}