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

namespace ytLive.Tests;

public sealed class LayoutStoreSnapshotTests
{
    [Fact]
    public void SameBuild_OpensCurrentLayout_WithoutChangingDefaultSnapshot()
    {
        var path = Path.Combine(Path.GetTempPath(), $"ytLlive-layout-snapshot-{Guid.NewGuid():N}.db");
        const string buildId = "build-a";
        try
        {
            using (var store = new LayoutStore(path))
            {
                var factory = MakeScene("Factory title");
                store.Save(new[] { factory }, null, null);
                store.PrepareLayoutSnapshots(buildId);

                store.Save(new[] { MakeScene("Creator edit") }, null, null);
            }

            using (var reopened = new LayoutStore(path))
            {
                reopened.PrepareLayoutSnapshots(buildId);
                var current = Assert.Single(reopened.Load());
                Assert.Equal("Creator edit", Assert.Single(current.Elements.OfType<Source>()).Name);

                using var connection = GetConnection(path);
                using var command = connection.CreateCommand();
                command.CommandText = "SELECT Value FROM LayoutSnapshotState WHERE Key = 'CurrentBuildId';";
                Assert.Equal(buildId, command.ExecuteScalar());

                command.CommandText = "SELECT Name FROM DefaultSource;";
                Assert.Equal("Factory title", command.ExecuteScalar());
            }
        }
        finally
        {
            SqliteConnection.ClearAllPools();
            try { File.Delete(path); } catch { /* best-effort cleanup */ }
        }
    }

    [Fact]
    public void DifferentBuild_RestoresTheDefaultSnapshotBeforeLoading()
    {
        var path = Path.Combine(Path.GetTempPath(), $"ytLlive-layout-snapshot-{Guid.NewGuid():N}.db");
        try
        {
            using (var store = new LayoutStore(path))
            {
                store.Save(new[] { MakeScene("Factory title") }, null, null);
                store.PrepareLayoutSnapshots("build-a");
                store.Save(new[] { MakeScene("Creator edit") }, null, null);
            }

            using (var reopened = new LayoutStore(path))
            {
                reopened.PrepareLayoutSnapshots("build-b");
                var restored = Assert.Single(reopened.Load());
                Assert.Equal("Factory title", Assert.Single(restored.Elements.OfType<Source>()).Name);

                using var connection = GetConnection(path);
                using var command = connection.CreateCommand();
                command.CommandText = "SELECT Value FROM LayoutSnapshotState WHERE Key = 'CurrentBuildId';";
                Assert.Equal("build-b", command.ExecuteScalar());
            }
        }
        finally
        {
            SqliteConnection.ClearAllPools();
            try { File.Delete(path); } catch { /* best-effort cleanup */ }
        }
    }

    [Fact]
    public void ResetOneScene_RestoresItsFactoryLayers_AndKeepsOtherSceneEdits()
    {
        var path = Path.Combine(Path.GetTempPath(), $"ytLlive-layout-snapshot-{Guid.NewGuid():N}.db");
        var starting = MakeScene(SceneCatalog.Starting, "Factory starting");
        var brb = MakeScene(SceneCatalog.Brb, "Factory BRB");
        try
        {
            using (var store = new LayoutStore(path))
            {
                store.Save(new[] { starting, brb }, null, null);
                store.PrepareLayoutSnapshots("build-a");
                store.Save(new[]
                {
                    MakeScene(starting.Id, starting.Name, "Edited starting"),
                    MakeScene(brb.Id, brb.Name, "Edited BRB"),
                }, null, null);
            }

            using (var reopened = new LayoutStore(path))
            {
                reopened.PrepareLayoutSnapshots("build-a");
                Assert.True(reopened.RestoreDefaultScene(starting.Id));

                var scenes = reopened.Load();
                Assert.Equal("Factory starting", Assert.Single(scenes.Single(s => s.Id == starting.Id).Elements.OfType<Source>()).Name);
                Assert.Equal("Edited BRB", Assert.Single(scenes.Single(s => s.Id == brb.Id).Elements.OfType<Source>()).Name);
            }
        }
        finally
        {
            SqliteConnection.ClearAllPools();
            try { File.Delete(path); } catch { /* best-effort cleanup */ }
        }
    }

    private static Scene MakeScene(string sourceName)
        => MakeScene(SceneCatalog.Starting, sourceName);

    private static Scene MakeScene(string sceneName, string sourceName)
        => new()
        {
            Name = sceneName,
            Elements = { new Source { Name = sourceName, Type = SourceType.TextOverlay } },
        };

    private static Scene MakeScene(string id, string sceneName, string sourceName)
        => new()
        {
            Id = id,
            Name = sceneName,
            Elements = { new Source { Name = sourceName, Type = SourceType.TextOverlay } },
        };

    private static SqliteConnection GetConnection(string path)
    {
        var connection = new SqliteConnection($"Data Source={path}");
        connection.Open();
        return connection;
    }
}