using System.Security.Claims;
using Microsoft.AspNetCore.Components.Authorization;

namespace ChessCubing.App.Services;

public sealed class UserSession(AuthenticationStateProvider authenticationStateProvider)
{
    public async ValueTask<UserStorageScope> GetStorageScopeAsync()
    {
        var authState = await authenticationStateProvider.GetAuthenticationStateAsync();
        var userId = ResolveUserId(authState.User);

        return new UserStorageScope(
            $"{MatchStore.StorageKeyPrefix}:{userId}",
            $"{MatchStore.WindowNameKeyPrefix}:{userId}:");
    }

    private static string ResolveUserId(ClaimsPrincipal user)
    {
        if (user.Identity?.IsAuthenticated != true)
        {
            return "anonymous";
        }

        var rawIdentifier = user.FindFirst("sub")?.Value
            ?? user.FindFirst(ClaimTypes.NameIdentifier)?.Value
            ?? user.FindFirst("preferred_username")?.Value
            ?? user.Identity?.Name;

        if (string.IsNullOrWhiteSpace(rawIdentifier))
        {
            return "authenticated";
        }

        return Uri.EscapeDataString(rawIdentifier.Trim());
    }
}

public readonly record struct UserStorageScope(string StorageKey, string WindowNameKey);