using Umbraco.Cms.Core.Collections;
using Umbraco.Cms.Core.Hosting;
using Umbraco.Cms.Core.Install.Models;
using Umbraco.Cms.Core.Serialization;
using Umbraco.Extensions;

namespace Umbraco.Cms.Core.Install;

/// <summary>
///     An internal in-memory status tracker for the current installation
/// </summary>
[Obsolete("This will no longer be used with the new backoffice APi, instead all steps run in one go")]
public class InstallStatusTracker
{
    private static ConcurrentHashSet<InstallTrackingItem> _steps = new();
    private readonly IHostingEnvironment _hostingEnvironment;
    private readonly IJsonSerializer _jsonSerializer;

    public InstallStatusTracker(IHostingEnvironment hostingEnvironment, IJsonSerializer jsonSerializer)
    {
        _hostingEnvironment = hostingEnvironment;
        _jsonSerializer = jsonSerializer;
    }

    public static IEnumerable<InstallTrackingItem> GetStatus() =>
        new List<InstallTrackingItem>(_steps).OrderBy(x => x.ServerOrder);

    public void Reset()
    {
        _steps = new ConcurrentHashSet<InstallTrackingItem>();
        ClearFiles();
    }

    private string GetFile(Guid installId)
    {
        var file = _hostingEnvironment.MapPathContentRoot(Constants.SystemDirectories.TempData.EnsureEndsWith('/') +
                                                          "Install/"
                                                          + "install_"
                                                          + installId.ToString("N")
                                                          + ".txt");
        return file;
    }

    public void ClearFiles()
    {
        var dir = _hostingEnvironment.MapPathContentRoot(Constants.SystemDirectories.TempData.EnsureEndsWith('/') +
                                                         "Install/");
        if (Directory.Exists(dir))
        {
            var files = Directory.GetFiles(dir);
            foreach (var f in files)
            {
                File.Delete(f);
            }
        }
        else
        {
            Directory.CreateDirectory(dir);
        }
    }

    public IEnumerable<InstallTrackingItem> InitializeFromFile(Guid installId)
    {
        // check if we have our persisted file and read it
        var file = GetFile(installId);
        if (File.Exists(file))
        {
            IEnumerable<InstallTrackingItem>? deserialized =
                _jsonSerializer.Deserialize<IEnumerable<InstallTrackingItem>>(
                    File.ReadAllText(file));
            if (deserialized is not null)
            {
                foreach (InstallTrackingItem item in deserialized)
                {
                    _steps.Add(item);
                }
            }
        }
        else
        {
            throw new InvalidOperationException("Cannot initialize from file, the installation file with id " +
                                                installId + " does not exist");
        }

        return new List<InstallTrackingItem>(_steps);
    }

    public IEnumerable<InstallTrackingItem> Initialize(Guid installId, IEnumerable<InstallSetupStep> steps)
    {
        // if there are no steps in memory
        if (_steps.Count == 0)
        {
            // check if we have our persisted file and read it
            var file = GetFile(installId);
            if (File.Exists(file))
            {
                IEnumerable<InstallTrackingItem>? deserialized =
                    _jsonSerializer.Deserialize<IEnumerable<InstallTrackingItem>>(
                        File.ReadAllText(file));
                if (deserialized is not null)
                {
                    foreach (InstallTrackingItem item in deserialized)
                    {
                        _steps.Add(item);
                    }
                }
            }
            else
            {
                ClearFiles();

                // otherwise just create the steps in memory (brand new install)
                foreach (InstallSetupStep step in steps.OrderBy(x => x.ServerOrder))
                {
                    _steps.Add(new InstallTrackingItem(step.Name, step.ServerOrder));
                }

                // save the file
                var serialized = _jsonSerializer.Serialize(new List<InstallTrackingItem>(_steps));
                Directory.CreateDirectory(Path.GetDirectoryName(file)!);
                File.WriteAllText(file, serialized);
            }
        }
        else
        {
            // ensure that the file exists with the current install id
            var file = GetFile(installId);
            if (File.Exists(file) == false)
            {
                ClearFiles();

                // save the correct file
                var serialized = _jsonSerializer.Serialize(new List<InstallTrackingItem>(_steps));
                Directory.CreateDirectory(Path.GetDirectoryName(file)!);
                File.WriteAllText(file, serialized);
            }
        }

        return new List<InstallTrackingItem>(_steps);
    }

    public void SetComplete(Guid installId, string name, IDictionary<string, object>? additionalData = null)
    {
        InstallTrackingItem trackingItem = _steps.Single(x => x.Name == name);
        if (additionalData != null)
        {
            trackingItem.AdditionalData = additionalData;
        }

        trackingItem.IsComplete = true;

        // save the file
        var file = GetFile(installId);
        var serialized = _jsonSerializer.Serialize(new List<InstallTrackingItem>(_steps));
        File.WriteAllText(file, serialized);
    }
}