using Koogle.Domain.Interfaces;
using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Koogle.Infrastrcuture.Services;

public class CurrentUserService : ICurrentUserService
{
    private readonly IHttpContextAccessor _httpContextAccessor;

    /// <summary>
    /// Erstellt eine neue Instanz des CurrentUserService.
    /// </summary>
    /// <param name="httpContextAccessor">Der HTTP-Kontext-Accessor.</param>
    public CurrentUserService(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    /// <inheritdoc />
    public int UserId
    {
        get
        {
            //var userIdClaim = _httpContextAccessor.HttpContext?.UserProfile?.FindFirst(ClaimTypes.NameIdentifier)?.Value
            //    ?? _httpContextAccessor.HttpContext?.UserProfile?.FindFirst("sub")?.Value
            //    ?? _httpContextAccessor.HttpContext?.UserProfile?.FindFirst("oid")?.Value;
            var userIdClaim = _httpContextAccessor.HttpContext?.User?.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier")?.Value;

            return 0;
            //if (string.IsNullOrEmpty(userIdClaim))
            //    return Guid.Empty;

            //// Versuche zuerst als Guid zu parsen (für interne UserProfile-IDs)
            //if (Guid.TryParse(userIdClaim, out var userId))
            //    return userId;

            //// Falls es eine Azure AD Object ID ist, generiere eine deterministische Guid daraus
            //return GenerateDeterministicGuid(userIdClaim);
        }
    }

    /// <inheritdoc />
    public bool IsAuthenticated =>
        _httpContextAccessor.HttpContext?.User?.Identity?.IsAuthenticated ?? false;

    /// <summary>
    /// Generiert eine deterministische Guid aus einem String.
    /// </summary>
    private static Guid GenerateDeterministicGuid(string input)
    {
        using var md5 = System.Security.Cryptography.MD5.Create();
        var hash = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));
        return new Guid(hash);
    }
}