// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschraenkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using FakeItEasy;
using Microsoft.Extensions.Logging;
using NodaTime;
using Squidex.Domain.Apps.Core.TestHelpers;
using Squidex.Domain.Apps.Entities.Apps;
using Squidex.Domain.Apps.Entities.Notifications;
using Squidex.Domain.Apps.Entities.Teams;
using Squidex.Domain.Apps.Entities.TestHelpers;
using Squidex.Domain.Apps.Events.Apps;
using Squidex.Domain.Apps.Events.Teams;
using Squidex.Infrastructure;
using Squidex.Infrastructure.EventSourcing;
using Squidex.Shared.Users;
using Xunit;

namespace Squidex.Domain.Apps.Entities.Invitation
{
    public class InvitationEventConsumerTests
    {
        private readonly IAppEntity app = Mocks.App(NamedId.Of(DomainId.NewGuid(), "my-app"));
        private readonly IAppProvider appProvider = A.Fake<IAppProvider>();
        private readonly ILogger<InvitationEventConsumer> log = A.Fake<ILogger<InvitationEventConsumer>>();
        private readonly ITeamEntity team = Mocks.Team(DomainId.NewGuid());
        private readonly IUser assignee = UserMocks.User("2");
        private readonly IUser assigner = UserMocks.User("1");
        private readonly IUserNotifications userNotifications = A.Fake<IUserNotifications>();
        private readonly IUserResolver userResolver = A.Fake<IUserResolver>();
        private readonly string assignerId = DomainId.NewGuid().ToString();
        private readonly string assigneeId = DomainId.NewGuid().ToString();
        private readonly InvitationEventConsumer sut;

        public InvitationEventConsumerTests()
        {
            A.CallTo(() => userNotifications.IsActive)
                .Returns(true);

            A.CallTo(() => userResolver.FindByIdAsync(assignerId, default))
                .Returns(assigner);

            A.CallTo(() => userResolver.FindByIdAsync(assigneeId, default))
                .Returns(assignee);

            A.CallTo(() => appProvider.GetAppAsync(app.Id, true, default))
                .Returns(app);

            A.CallTo(() => appProvider.GetTeamAsync(team.Id, default))
                .Returns(team);

            sut = new InvitationEventConsumer(appProvider, userNotifications, userResolver, log);
        }

        [Fact]
        public async Task Should_not_send_app_email_if_contributors_assigned_by_clients()
        {
            var @event = CreateAppEvent(RefTokenType.Client, true);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_app_email_for_initial_owner()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, false, streamNumber: 1);

            await sut.On(@event);

            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_team_email_for_initial_owner()
        {
            var @event = CreateTeamEvent(false, streamNumber: 1);

            await sut.On(@event);

            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_app_email_for_old_events()
        {
            var created = SystemClock.Instance.GetCurrentInstant().Minus(Duration.FromHours(50));

            var @event = CreateAppEvent(RefTokenType.Subject, true, instant: created);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_team_email_for_old_events()
        {
            var created = SystemClock.Instance.GetCurrentInstant().Minus(Duration.FromHours(50));

            var @event = CreateTeamEvent(true, instant: created);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_app_email_for_old_contributor()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, true, isNewContributor: false);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_team_email_for_old_contributor()
        {
            var @event = CreateTeamEvent(true, isNewContributor: false);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_app_email_if_sender_not_active()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, true);

            A.CallTo(() => userNotifications.IsActive)
                .Returns(false);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_team_email_if_sender_not_active()
        {
            var @event = CreateTeamEvent(true);

            A.CallTo(() => userNotifications.IsActive)
                .Returns(false);

            await sut.On(@event);

            MustNotResolveUser();
            MustNotSendEmail();
        }

        [Fact]
        public async Task Should_not_send_app_email_if_assigner_not_found()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, true);

            A.CallTo(() => userResolver.FindByIdAsync(assignerId, default))
                .Returns(Task.FromResult<IUser?>(null));

            await sut.On(@event);

            MustNotSendEmail();
            MustLogWarning();
        }

        [Fact]
        public async Task Should_not_send_team_email_if_assigner_not_found()
        {
            var @event = CreateTeamEvent(true);

            A.CallTo(() => userResolver.FindByIdAsync(assignerId, default))
                .Returns(Task.FromResult<IUser?>(null));

            await sut.On(@event);

            MustNotSendEmail();
            MustLogWarning();
        }

        [Fact]
        public async Task Should_not_send_app_email_if_assignee_not_found()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, true);

            A.CallTo(() => userResolver.FindByIdAsync(assigneeId, default))
                .Returns(Task.FromResult<IUser?>(null));

            await sut.On(@event);

            MustNotSendEmail();
            MustLogWarning();
        }

        [Fact]
        public async Task Should_not_send_team_email_if_assignee_not_found()
        {
            var @event = CreateTeamEvent(true);

            A.CallTo(() => userResolver.FindByIdAsync(assigneeId, default))
                .Returns(Task.FromResult<IUser?>(null));

            await sut.On(@event);

            MustNotSendEmail();
            MustLogWarning();
        }

        [Fact]
        public async Task Should_send_app_email_for_new_user()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, true);

            await sut.On(@event);

            A.CallTo(() => userNotifications.SendInviteAsync(assigner, assignee, app, default))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_send_team_email_for_new_user()
        {
            var @event = CreateTeamEvent(true);

            await sut.On(@event);

            A.CallTo(() => userNotifications.SendInviteAsync(assigner, assignee, team, default))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_send_app_email_for_existing_user()
        {
            var @event = CreateAppEvent(RefTokenType.Subject, false);

            await sut.On(@event);

            A.CallTo(() => userNotifications.SendInviteAsync(assigner, assignee, app, default))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_send_team_email_for_existing_user()
        {
            var @event = CreateTeamEvent(false);

            await sut.On(@event);

            A.CallTo(() => userNotifications.SendInviteAsync(assigner, assignee, team, default))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_not_send_team_email_if_team_not_found()
        {
            var @event = CreateTeamEvent(true);

            A.CallTo(() => appProvider.GetTeamAsync(A<DomainId>._, default))
                .Returns(Task.FromResult<ITeamEntity?>(null));

            await sut.On(@event);

            MustNotSendEmail();
        }

        private void MustLogWarning()
        {
            A.CallTo(log).Where(x => x.Method.Name == "Log" && x.GetArgument<LogLevel>(0) == LogLevel.Warning)
                .MustHaveHappened();
        }

        private void MustNotResolveUser()
        {
            A.CallTo(() => userResolver.FindByIdAsync(A<string>._, A<CancellationToken>._))
                .MustNotHaveHappened();
        }

        private void MustNotSendEmail()
        {
            A.CallTo(() => userNotifications.SendInviteAsync(A<IUser>._, A<IUser>._, A<IAppEntity>._, default))
                .MustNotHaveHappened();

            A.CallTo(() => userNotifications.SendInviteAsync(A<IUser>._, A<IUser>._, A<IAppEntity>._, default))
                .MustNotHaveHappened();
        }

        private Envelope<IEvent> CreateAppEvent(RefTokenType assignerType, bool isNewUser, bool isNewContributor = true, Instant? instant = null, int streamNumber = 2)
        {
            var @event = new AppContributorAssigned
            {
                Actor = new RefToken(assignerType, assignerId),
                AppId = app.NamedId(),
                ContributorId = assigneeId,
                IsCreated = isNewUser,
                IsAdded = isNewContributor
            };

            var envelope = Envelope.Create(@event);

            envelope.SetTimestamp(instant ?? SystemClock.Instance.GetCurrentInstant());
            envelope.SetEventStreamNumber(streamNumber);

            return envelope;
        }

        private Envelope<IEvent> CreateTeamEvent(bool isNewUser, bool isNewContributor = true, Instant? instant = null, int streamNumber = 2)
        {
            var @event = new TeamContributorAssigned
            {
                Actor = new RefToken(RefTokenType.Subject, assignerId),
                ContributorId = assigneeId,
                IsCreated = isNewUser,
                IsAdded = isNewContributor,
                TeamId = team.Id
            };

            var envelope = Envelope.Create(@event);

            envelope.SetTimestamp(instant ?? SystemClock.Instance.GetCurrentInstant());
            envelope.SetEventStreamNumber(streamNumber);

            return envelope;
        }
    }
}