using System.Security.Claims;
using Microsoft.AspNetCore.Components.Authorization;
using QuantEngine.Web.Client.Services;

namespace QuantEngine.Web.Client.Infrastructure
{
    public class CustomAuthenticationStateProvider : AuthenticationStateProvider
    {
        private readonly LocalStorageService _localStorage;
        private readonly ClaimsPrincipal _anonymous = new ClaimsPrincipal(new ClaimsIdentity());
        private const string StorageKey = "quant_admin_session";

        public CustomAuthenticationStateProvider(LocalStorageService localStorage)
        {
            _localStorage = localStorage;
        }

        public override async Task<AuthenticationState> GetAuthenticationStateAsync()
        {
            try
            {
                var username = await _localStorage.GetAsync<string>(StorageKey);
                if (!string.IsNullOrEmpty(username))
                {
                    var identity = new ClaimsIdentity(new[]
                    {
                        new Claim(ClaimTypes.Name, username),
                        new Claim(ClaimTypes.Role, "Admin")
                    }, "QuantAdminAuth");

                    var user = new ClaimsPrincipal(identity);
                    return new AuthenticationState(user);
                }
            }
            catch
            {
                // Return anonymous if localStorage isn't ready
            }

            return new AuthenticationState(_anonymous);
        }

        public async Task MarkUserAsAuthenticatedAsync(string username)
        {
            await _localStorage.SetAsync(StorageKey, username);

            var identity = new ClaimsIdentity(new[]
            {
                new Claim(ClaimTypes.Name, username),
                new Claim(ClaimTypes.Role, "Admin")
            }, "QuantAdminAuth");

            var user = new ClaimsPrincipal(identity);
            NotifyAuthenticationStateChanged(Task.FromResult(new AuthenticationState(user)));
        }

        public async Task MarkUserAsLoggedOutAsync()
        {
            await _localStorage.DeleteAsync(StorageKey);
            NotifyAuthenticationStateChanged(Task.FromResult(new AuthenticationState(_anonymous)));
        }
    }
}