// Copyright (c) Umbraco.
// See LICENSE for more details.

using System.Collections.Generic;
using System.Security.Claims;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Primitives;
using Moq;
using NUnit.Framework;
using Umbraco.Cms.Core;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.Models.Membership;
using Umbraco.Cms.Core.Security;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Tests.Common.Builders;
using Umbraco.Cms.Tests.Common.Builders.Extensions;
using Umbraco.Cms.Web.BackOffice.Authorization;

namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Web.BackOffice.Authorization;

public class UserGroupHandlerTests
{
    private const string QueryStringName = "id";

    private const int Group1Id = 1;
    private const string Group1Alias = "group1";
    private const int Group2Id = 2;
    private const string Group2Alias = "group2";
    private const int Group3Id = 3;
    private const string Group3Alias = "group3";

    [Test]
    public async Task Missing_QueryString_Value_Is_Authorized()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler();

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task Admin_User_Is_Authorised()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler(Group1Id.ToString(), true);

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task User_Matching_Single_Requested_Group_Id_Is_Authorised()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler(Group1Id.ToString());

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task User_Matching_Only_One_Of_Requested_Group_Ids_Is_NOT_Authorised()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler($"{Group1Id},{Group2Id}");

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasFailed);
    }

    [Test]
    public async Task User_Not_Matching_Single_Requested_Group_Id_Is_Not_Authorised()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler(Group2Id.ToString());

        await sut.HandleAsync(authHandlerContext);

        Assert.IsFalse(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task User_Not_Matching_Any_Of_Requested_Group_Ids_Is_Not_Authorised()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler($"{Group2Id},{Group3Id}");

        await sut.HandleAsync(authHandlerContext);

        Assert.IsFalse(authHandlerContext.HasSucceeded);
    }

    private static AuthorizationHandlerContext CreateAuthorizationHandlerContext()
    {
        var requirement = new UserGroupRequirement();
        var user = new ClaimsPrincipal(new ClaimsIdentity(new List<Claim>()));
        var resource = new object();
        return new AuthorizationHandlerContext(new List<IAuthorizationRequirement> { requirement }, user, resource);
    }

    private UserGroupHandler CreateHandler(string queryStringValue = "", bool userIsAdmin = false)
    {
        var mockHttpContextAccessor = CreateMockHttpContextAccessor(queryStringValue);

        var mockUserService = CreateMockUserService();

        var mockContentService = new Mock<IContentService>();
        var mockMediaService = new Mock<IMediaService>();
        var mockEntityService = new Mock<IEntityService>();

        var mockBackOfficeSecurityAccessor = CreateMockBackOfficeSecurityAccessor(userIsAdmin);

        return new UserGroupHandler(
            mockHttpContextAccessor.Object,
            mockUserService.Object,
            mockContentService.Object,
            mockMediaService.Object,
            mockEntityService.Object,
            mockBackOfficeSecurityAccessor.Object,
            AppCaches.Disabled);
    }

    private static Mock<IHttpContextAccessor> CreateMockHttpContextAccessor(string queryStringValue)
    {
        var mockHttpContextAccessor = new Mock<IHttpContextAccessor>();
        var mockHttpContext = new Mock<HttpContext>();
        var mockHttpRequest = new Mock<HttpRequest>();
        var queryParams = new Dictionary<string, StringValues> { { QueryStringName, queryStringValue } };
        mockHttpRequest.SetupGet(x => x.Query).Returns(new QueryCollection(queryParams));
        mockHttpContext.SetupGet(x => x.Request).Returns(mockHttpRequest.Object);
        mockHttpContextAccessor.SetupGet(x => x.HttpContext).Returns(mockHttpContext.Object);
        return mockHttpContextAccessor;
    }

    private Mock<IUserService> CreateMockUserService()
    {
        var mockUserService = new Mock<IUserService>();
        mockUserService
            .Setup(x => x.GetAllUserGroups(It.Is<int[]>(y => y.Length == 1 && y[0] == Group1Id)))
            .Returns(new List<IUserGroup> { CreateUserGroup(Group1Id, Group1Alias) });
        mockUserService
            .Setup(x => x.GetAllUserGroups(It.Is<int[]>(y => y.Length == 1 && y[0] == Group2Id)))
            .Returns(new List<IUserGroup> { CreateUserGroup(Group2Id, Group2Alias) });
        mockUserService
            .Setup(x => x.GetAllUserGroups(It.Is<int[]>(y => y.Length == 2 && y[0] == Group1Id && y[1] == Group2Id)))
            .Returns(new List<IUserGroup>
            {
                CreateUserGroup(Group1Id, Group1Alias),
                CreateUserGroup(Group2Id, Group2Alias),
            });
        mockUserService
            .Setup(x => x.GetAllUserGroups(It.Is<int[]>(y => y.Length == 2 && y[0] == Group2Id && y[1] == Group3Id)))
            .Returns(new List<IUserGroup>
            {
                CreateUserGroup(Group2Id, Group2Alias),
                CreateUserGroup(Group3Id, Group3Alias),
            });
        return mockUserService;
    }

    private static Mock<IBackOfficeSecurityAccessor> CreateMockBackOfficeSecurityAccessor(bool userIsAdmin)
    {
        var user = CreateUser(userIsAdmin);
        var mockBackOfficeSecurity = new Mock<IBackOfficeSecurity>();
        mockBackOfficeSecurity.SetupGet(x => x.CurrentUser).Returns(user);
        var mockBackOfficeSecurityAccessor = new Mock<IBackOfficeSecurityAccessor>();
        mockBackOfficeSecurityAccessor.Setup(x => x.BackOfficeSecurity).Returns(mockBackOfficeSecurity.Object);
        return mockBackOfficeSecurityAccessor;
    }

    private static User CreateUser(bool isAdmin = false) =>
        new UserBuilder()
            .AddUserGroup()
            .WithAlias(isAdmin ? Constants.Security.AdminGroupAlias : Group1Alias)
            .Done()
            .Build();

    private IUserGroup CreateUserGroup(int id, string alias) =>
        new UserGroupBuilder()
            .WithId(id)
            .WithAlias(alias)
            .Build();
}