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

using System.Threading.Tasks;
using Squidex.Domain.Apps.Entities.Apps.Commands;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Commands;
using Squidex.Shared.Users;

namespace Squidex.Domain.Apps.Entities.Apps.Invitation
{
    public sealed class InviteUserCommandMiddleware : ICommandMiddleware
    {
        private readonly IUserResolver userResolver;

        public InviteUserCommandMiddleware(IUserResolver userResolver)
        {
            Guard.NotNull(userResolver);

            this.userResolver = userResolver;
        }

        public async Task HandleAsync(CommandContext context, NextDelegate next)
        {
            if (context.Command is AssignContributor assignContributor && ShouldInvite(assignContributor))
            {
                var (user, created) = await userResolver.CreateUserIfNotExistsAsync(assignContributor.ContributorId, true);

                if (user != null)
                {
                    assignContributor.ContributorId = user.Id;
                }

                await next(context);

                if (created && context.PlainResult is IAppEntity app)
                {
                    context.Complete(new InvitedResult { App = app });
                }
            }
            else
            {
                await next(context);
            }
        }

        private static bool ShouldInvite(AssignContributor assignContributor)
        {
            return assignContributor.Invite && assignContributor.ContributorId.IsEmail();
        }
    }
}