// 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 Moq;
using NUnit.Framework;
using Umbraco.Cms.Core;
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 BackOfficeHandlerTests
{
    [Test]
    public async Task Runtime_State_Install_Is_Authorized()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler(RuntimeLevel.Install);

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task Runtime_State_Upgrade_Is_Authorized()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler(RuntimeLevel.Upgrade);

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

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

        await sut.HandleAsync(authHandlerContext);

        Assert.IsFalse(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task Authenticated_User_Is_Not_Authorized_When_Not_Approved_And_Approval_Required()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext(true);
        var sut = CreateHandler(currentUserIsAuthenticated: true);

        await sut.HandleAsync(authHandlerContext);

        Assert.IsFalse(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task Authenticated_User_Is_Authorized_When_Not_Approved_And_Approval_Not_Required()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext();
        var sut = CreateHandler(currentUserIsAuthenticated: true);

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

    [Test]
    public async Task Authenticated_User_Is_Authorized_When_Approved_And_Approval_Required()
    {
        var authHandlerContext = CreateAuthorizationHandlerContext(true);
        var sut = CreateHandler(currentUserIsAuthenticated: true, currentUserIsApproved: true);

        await sut.HandleAsync(authHandlerContext);

        Assert.IsTrue(authHandlerContext.HasSucceeded);
    }

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

    private BackOfficeHandler CreateHandler(
        RuntimeLevel runtimeLevel = RuntimeLevel.Run,
        bool currentUserIsAuthenticated = false,
        bool currentUserIsApproved = false)
    {
        var mockBackOfficeSecurityAccessor =
            CreateMockBackOfficeSecurityAccessor(currentUserIsAuthenticated, currentUserIsApproved);
        var mockRuntimeState = CreateMockRuntimeState(runtimeLevel);
        return new BackOfficeHandler(mockBackOfficeSecurityAccessor.Object, mockRuntimeState.Object);
    }

    private static Mock<IBackOfficeSecurityAccessor> CreateMockBackOfficeSecurityAccessor(
        bool currentUserIsAuthenticated, bool currentUserIsApproved)
    {
        var user = new UserBuilder()
            .WithIsApproved(currentUserIsApproved)
            .Build();
        var mockBackOfficeSecurity = new Mock<IBackOfficeSecurity>();
        mockBackOfficeSecurity.Setup(x => x.IsAuthenticated()).Returns(currentUserIsAuthenticated);
        if (currentUserIsAuthenticated)
        {
            mockBackOfficeSecurity.Setup(x => x.CurrentUser).Returns(user);
        }

        var mockBackOfficeSecurityAccessor = new Mock<IBackOfficeSecurityAccessor>();
        mockBackOfficeSecurityAccessor.Setup(x => x.BackOfficeSecurity).Returns(mockBackOfficeSecurity.Object);
        return mockBackOfficeSecurityAccessor;
    }

    private static Mock<IRuntimeState> CreateMockRuntimeState(RuntimeLevel runtimeLevel)
    {
        var mockRuntimeState = new Mock<IRuntimeState>();
        mockRuntimeState.SetupGet(x => x.Level).Returns(runtimeLevel);
        return mockRuntimeState;
    }
}