using SharepointToolbox.Web.Core.Models;
using SharepointToolbox.Web.Infrastructure.Persistence;

namespace SharepointToolbox.Web.Services.Session;

public class UserSessionService : IUserSessionService
{
    private readonly ISessionManager _sessionManager;
    private readonly SettingsRepository _settingsRepo;

    private TenantProfile? _currentProfile;
    private AppSettings _settings = new();

    public TenantProfile? CurrentProfile => _currentProfile;
    public bool HasProfile => _currentProfile is not null;
    public AppSettings Settings => _settings;

    public ReportBranding CurrentBranding => new(_settings.MspLogo, _currentProfile?.ClientLogo);

    public event Action? ProfileChanged;

    public UserSessionService(ISessionManager sessionManager, SettingsRepository settingsRepo)
    {
        _sessionManager = sessionManager;
        _settingsRepo = settingsRepo;
        // Load synchronously so Settings (esp. Lang) are available the moment the circuit
        // starts — culture is applied in MainLayout.OnInitialized before any page renders,
        // so a fire-and-forget load here would race and lose.
        //
        // Run on the thread pool (Task.Run) so LoadAsync's await continuation does NOT post
        // back to the circuit's SynchronizationContext. Blocking that context here with a plain
        // GetResult() deadlocks: the continuation can never resume on the thread we're blocking.
        try { _settings = Task.Run(() => _settingsRepo.LoadAsync()).GetAwaiter().GetResult(); }
        catch { /* use defaults */ }
    }

    public void SetProfile(TenantProfile profile)
    {
        _currentProfile = profile;
        ProfileChanged?.Invoke();
    }

    public async Task ClearSessionAsync()
    {
        if (_currentProfile is not null)
            await _sessionManager.ClearSessionAsync(_currentProfile.TenantUrl);
        _currentProfile = null;
        ProfileChanged?.Invoke();
    }

    public void UpdateSettings(AppSettings settings)
    {
        _settings = settings;
        _ = _settingsRepo.SaveAsync(settings);
    }
}