using ClaudeDo.Releases;
using CommunityToolkit.Mvvm.ComponentModel;

namespace ClaudeDo.Ui.Services;

public enum UpdateCheckStatus
{
    NeverChecked,
    CheckFailed,
    UpToDate,
    UpdateAvailable,
}

public sealed partial class UpdateCheckService : ObservableObject
{
    private readonly IReleaseClient _releases;

    [ObservableProperty] private bool _isUpdateAvailable;
    [ObservableProperty] private string? _latestVersion;
    [ObservableProperty] private string _currentVersion;
    [ObservableProperty] private bool _isChecking;
    [ObservableProperty] private UpdateCheckStatus _lastCheckStatus = UpdateCheckStatus.NeverChecked;

    public UpdateCheckService(IReleaseClient releases, string currentVersion)
    {
        _releases = releases;
        _currentVersion = currentVersion;
    }

    public async Task CheckNowAsync(CancellationToken ct)
    {
        IsChecking = true;
        try
        {
            GiteaRelease? rel;
            try
            {
                rel = await _releases.GetLatestReleaseAsync(ct);
            }
            catch
            {
                LastCheckStatus = UpdateCheckStatus.CheckFailed;
                IsUpdateAvailable = false;
                return;
            }

            if (rel is null)
            {
                LastCheckStatus = UpdateCheckStatus.CheckFailed;
                IsUpdateAvailable = false;
                return;
            }

            var latest = (rel.TagName ?? "").TrimStart('v', 'V');
            var cmp = VersionComparer.Compare(latest, CurrentVersion);
            if (cmp.IsNewer)
            {
                LatestVersion = latest;
                IsUpdateAvailable = true;
                LastCheckStatus = UpdateCheckStatus.UpdateAvailable;
            }
            else
            {
                IsUpdateAvailable = false;
                LastCheckStatus = UpdateCheckStatus.UpToDate;
            }
        }
        finally
        {
            IsChecking = false;
        }
    }
}