using System.Security.Claims;
using ManagerService.Security;
using ManagerService.Tests.Infrastructure;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
using Moq;
using Xunit;

namespace ManagerService.Tests.Security
{
    /// <summary>
    /// Les tests des contrôleurs appellent les méthodes <b>directement</b> : aucun filtre
    /// d'autorisation ne s'y exécute, et ils ne prouvent donc rien sur la fermeture des
    /// routes. C'est ce trou-là que ces tests comblent — ils visent le filtre lui-même.
    /// </summary>
    public class RequireAppKeyAttributeTests
    {
        private static AuthorizationFilterContext BuildContext(
            bool apiKeyValid, ClaimsPrincipal user = null)
        {
            var authentication = new Mock<IAuthenticationService>();
            authentication
                .Setup(a => a.AuthenticateAsync(It.IsAny<HttpContext>(),
                                                RequireAppKeyAttribute.ApiKeyScheme))
                .ReturnsAsync(apiKeyValid
                    ? AuthenticateResult.Success(new AuthenticationTicket(
                        new ClaimsPrincipal(new ClaimsIdentity("ApiKey")),
                        RequireAppKeyAttribute.ApiKeyScheme))
                    : AuthenticateResult.NoResult());

            var services = new ServiceCollection();
            services.AddSingleton(authentication.Object);

            var http = new DefaultHttpContext
            {
                RequestServices = services.BuildServiceProvider(),
                User = user ?? new ClaimsPrincipal(new ClaimsIdentity())
            };

            return new AuthorizationFilterContext(
                new ActionContext(http, new RouteData(), new ActionDescriptor()),
                new List<IFilterMetadata>());
        }

        [Fact]
        public async Task NoKeyNoUser_Returns401()
        {
            var context = BuildContext(apiKeyValid: false);

            await new RequireAppKeyAttribute().OnAuthorizationAsync(context);

            var result = Assert.IsType<ObjectResult>(context.Result);
            Assert.Equal(401, result.StatusCode);
        }

        [Fact]
        public async Task ValidApiKey_LetsThrough()
        {
            var context = BuildContext(apiKeyValid: true);

            await new RequireAppKeyAttribute().OnAuthorizationAsync(context);

            Assert.Null(context.Result);
        }

        [Fact]
        public async Task ManagerUser_LetsThrough()
        {
            // Le back-office appelle les mêmes routes avec son jeton, sans clé d'API.
            var manager = new ClaimsPrincipal(new ClaimsIdentity(
                new[] { new Claim(ClaimTypeKeys.Permission, Permissions.Viewer) },
                authenticationType: "Bearer"));

            var context = BuildContext(apiKeyValid: false, user: manager);

            await new RequireAppKeyAttribute().OnAuthorizationAsync(context);

            Assert.Null(context.Result);
        }

        [Fact]
        public async Task AuthenticatedWithoutPermission_Returns401()
        {
            // Authentifié ne suffit pas : il faut la permission de lecture.
            var stranger = new ClaimsPrincipal(new ClaimsIdentity(
                new[] { new Claim("sub", "someone") }, authenticationType: "Bearer"));

            var context = BuildContext(apiKeyValid: false, user: stranger);

            await new RequireAppKeyAttribute().OnAuthorizationAsync(context);

            var result = Assert.IsType<ObjectResult>(context.Result);
            Assert.Equal(401, result.StatusCode);
        }
    }
}