server/src/Infrastructure.EntityFramework/Repositories/Queries/EmergencyAccessReadCountByGrantorIdEmailQuery.cs

using System;
using System.Linq;
using Bit.Infrastructure.EntityFramework.Models;

namespace Bit.Infrastructure.EntityFramework.Repositories.Queries
{
    public class EmergencyAccessReadCountByGrantorIdEmailQuery : IQuery<EmergencyAccess>
    {
        private readonly Guid _grantorId;
        private readonly string _email;
        private readonly bool _onlyRegisteredUsers;

        public EmergencyAccessReadCountByGrantorIdEmailQuery(Guid grantorId, string email, bool onlyRegisteredUsers)
        {
            _grantorId = grantorId;
            _email = email;
            _onlyRegisteredUsers = onlyRegisteredUsers;
        }

        public IQueryable<EmergencyAccess> Run(DatabaseContext dbContext)
        {
            var query = from ea in dbContext.EmergencyAccesses
                        join u in dbContext.Users
                            on ea.GranteeId equals u.Id into u_g
                        from u in u_g.DefaultIfEmpty()
                        where ea.GrantorId == _grantorId &&
                            ((!_onlyRegisteredUsers && (ea.Email == _email || u.Email == _email))
                             || (_onlyRegisteredUsers && u.Email == _email))
                        select ea;
            return query;
        }
    }
}