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

namespace ytLive.Tests;

/// <summary>
/// TASK 32·3 — Back on air. Once YouTube completes a broadcast it cannot be resumed, so the only honest
/// route back is a NEW broadcast: one click, saved details, no dialog, and a title that says it is a
/// resume (otherwise the channel grows two identically named videos).
/// </summary>
// Constructs a MainViewModel directly, and `LayoutPathOverride` is static: it belongs in the serialised
// collection with the other direct-construction tests, or a parallel sibling can swap the layout path
// underneath it (observed as a one-off failure in a full run, green in isolation).
[Collection("MainViewModelLayoutPath")]
public class BackOnAirTests
{
    [Fact]
    public void ResumeTitle_MarksTheFirstReAir()
        => Assert.Equal("Friday Night Show (resumed)", BroadcastTitle.ForResume("Friday Night Show", 1));

    [Fact]
    public void ResumeTitle_CountsASecondDrop_InsteadOfStackingMarkers()
        => Assert.Equal("Friday Night Show (resumed 2)", BroadcastTitle.ForResume("Friday Night Show (resumed)", 2));

    [Fact]
    public void ResumeTitle_FitsYouTubesHundredCharacterLimit()
    {
        var longTitle = new string('x', 140);
        var resumed = BroadcastTitle.ForResume(longTitle, 1);

        Assert.Equal(BroadcastTitle.MaxLength, resumed.Length);
        Assert.EndsWith(" (resumed)", resumed);
    }

    [Fact]
    public void ResumeTitle_HandlesAnEmptyTitle()
        => Assert.Equal("LlamaCasty (resumed)", BroadcastTitle.ForResume("   ", 1));

    [Fact]
    public void AfterADrop_TheCreatorIsOfferedOneClickBackOnAir()
    {
        var tempDb = Path.Combine(Path.GetTempPath(), $"ytLlive-backonair-{Guid.NewGuid():N}.db");
        MainViewModel.LayoutPathOverride = tempDb;
        var vm = new MainViewModel();
        try
        {
            Assert.False(vm.IsOffAirAfterDrop);
            Assert.False(vm.BackOnAirCommand.CanExecute(null));

            vm.MarkOffAirAfterDropForTest("Friday Night Show");

            Assert.True(vm.IsOffAirAfterDrop);
            Assert.True(vm.BackOnAirCommand.CanExecute(null));
            Assert.Equal("● Back on air", vm.BackOnAirLabel);
            // The ordinary start button steps aside so there is exactly one way forward.
            Assert.False(vm.ShowPrimaryStartButton);
        }
        finally
        {
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(tempDb); } catch { /* best-effort cleanup */ }
        }
    }
}