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

namespace ytLive.Tests;

/// <summary>
/// Scene-strip ordering vs F-keys (creator's report 2026-10-10). The five
/// canonical scenes are loaded <c>ORDER BY SortOrder</c>, and a session can
/// persist Chat before BRB, so the thumbnail strip renders in the wrong order
/// while each tab's F-key label is name-derived — "the ordering of the 5
/// screens and their corresponding F-key is out of sequence". Fix: the VM
/// reorders Scenes to the canonical F1-F5 order (Starting, Live, BRB, Chat,
/// Ending) at load; the next save re-stamps SortOrder to the corrected order.
/// </summary>
[Collection("RealApp")]
public sealed class SceneOrderTests
{
    private readonly RealAppHost _app;

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

    [Fact]
    public void Scenes_Load_Into_Canonical_FKey_Order_Whatever_The_SortOrder_Rows()
    {
        _app.Run(() =>
        {
            using var layout = new TempSwappedOrderLayout();

            var vm = new MainViewModel();

            var names = vm.Scenes.Select(s => s.Name).ToArray();
            Assert.Equal(new[] { "Starting", "Live", "BRB", "Chat", "Ending" }, names);

            var keys = vm.Scenes.Select(s => s.HotkeyLabel).ToArray();
            Assert.Equal(new[] { "F1", "F2", "F3", "F4", "F5" }, keys);

            // The heal persists: a save re-stamps SortOrder, so a fresh load (the
            // thumbnail strip's rendering source) keeps the canonical order.
            vm.SaveLayoutNow();
            using var reloaded = new Services.LayoutStore(layout.DbPath);
            Assert.Equal(new[] { "Starting", "Live", "BRB", "Chat", "Ending" },
                reloaded.Load().Select(s => s.Name).ToArray());
        });
    }

    /// <summary>Creates a DB whose five scenes are persisted with Chat BEFORE
    /// BRB — the exact stale state found on the creator's box.</summary>
    private sealed class TempSwappedOrderLayout : IDisposable
    {
        public string DbPath { get; }
        private readonly string _path;

        public TempSwappedOrderLayout()
        {
            _path = Path.Combine(Path.GetTempPath(), $"ytLive-sceneorder-{Guid.NewGuid():N}.db");
            DbPath = _path;
            using (var schema = new Services.LayoutStore(_path)) { }
            SqliteConnection.ClearAllPools();
            MainViewModel.LayoutPathOverride = _path;

            using var connection = new SqliteConnection($"Data Source={_path}");
            connection.Open();
            using (var cmd = connection.CreateCommand())
            {
                cmd.CommandText = """
                    INSERT INTO Scene (Id, Name, IsHidden, IsChatScene, HasBackground, SortOrder)
                    VALUES
                        ('scene-starting', 'Starting', 0, 0, 1, 0),
                        ('scene-live',     'Live',     0, 0, 1, 1),
                        ('scene-chat',     'Chat',     0, 1, 1, 2),
                        ('scene-brb',      'BRB',      0, 0, 1, 3),
                        ('scene-ending',   'Ending',   0, 0, 1, 4);
                    """;
                cmd.ExecuteNonQuery();
            }
        }

        public void Dispose()
        {
            MainViewModel.LayoutPathOverride = null;
            SqliteConnection.ClearAllPools();
            try { File.Delete(_path); } catch { /* best-effort cleanup */ }
        }
    }
}