using System;
using System.IO;
using Microsoft.Data.Sqlite;
using Xunit;
using ytLive.Services;
using ytLive.ViewModels;

namespace ytLive.Tests;

/// <summary>
/// Session-teardown integration (2026-09-01, first native launch): a frame-pump death
/// must roll the WHOLE session back — record-only sessions used to stay IsRecording=true
/// with a dead encoder (no live session to flip StreamStatus), and StopStream never
/// cleared the intent pills. "Stop ends everything" (creator ruling): pills slide off
/// with the session; re-arming is one click. Real-App + temp-DB pattern.
/// </summary>
[Collection("RealApp")]
public sealed class SessionTeardownTests
{
    private readonly RealAppHost _app;

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

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

    private void Run()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-teardown-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        var window = default(MainWindow);
        try
        {
            using (var schema = new LayoutStore(tempDb)) { }
            SqliteConnection.ClearAllPools();

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

            // The exact 2026-09-01 zombie: record-only, intent lit, reality true,
            // encoder already dead. Sign-in absent — the guard must also prove no
            // close-out API call is attempted for a record-only session (StopStream
            // completes without throwing offline).
            vm.RecordPillOn = true;
            vm.IsRecording = true;

            vm.OnFramePumpFailed(this, "test: ffmpeg exited");

            Assert.False(vm.IsRecording, "pump death must roll IsRecording back — no zombie session");
            Assert.False(vm.RecordPillOn, "Stop ends everything — the REC pill slides off with the session");
            Assert.False(vm.OnAirPillOn, "both pills clear");
            Assert.False(vm.ShowEndStreamButton, "no End button once nothing is running");
            Assert.Equal(ytLive.Models.StreamStatus.Offline, vm.StreamStatus);
            // No dead ends (2026-09-01): after a stop the top bar must still offer a
            // reachable Start — pills cleared + signed out used to blank the button.
            Assert.True(vm.ShowPrimaryStartButton, "a stopped session must leave a Start button");
        }
        finally
        {
            if (window != null) window.Close();
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best-effort */ }
        }
    }
}