using System;

using System.Collections.Generic;

​

public class EmployeeService

{

    public bool IsAnyEmployeeInDepartment(string department)

    {

        bool Result = false;

        using (IEmployeeRepository employeeRepository = new EmployeeRepository())

        {

            List<Employee> employees = employeeRepository.GetEmployees();

            foreach (var employee in employees)

            {

                if (employee.Department == department)

                {

                    Result = true;

                }

            }

            return Result;

        }

    }

​

    public bool AddEmployee(Employee employee)            

    {

        if (IsEmployeeValid(employee, out string errorMessage))

        {

            using (IEmployeeRepository employeeRepository = new EmployeeRepository())

            {

                employeeRepository.Save(employee);

                return true;

            }

        }

        return false;

    }

​

    private bool IsEmployeeValid(Employee employee, out string errorMessage)

    {

        if(string.IsNullOrWhiteSpace(employee.Name))

        {

            errorMessage = "Name is required";

            return false;

        }

​

        if(string.IsNullOrEmpty(employee.Department))

        {

            errorMessage = "Department is required";

            return false;

        }

​

        errorMessage = null;

        return true;

    }

}

​

//ANYTHING BELOW THIS LINE IS NOT PART OF THE INTERVIEW

public interface IEmployeeRepository : IDisposable

{

    List<Employee> GetEmployees();

    bool Save(Employee employee);

}

​

public class EmployeeRepository : IEmployeeRepository

{

    public List<Employee> GetEmployees()

    {

        return null;

    }

    public bool Save(Employee employee)

    {

        return true;

    }

    public void Dispose()

    {

​

    }

}

​

public class Employee

{

    public string Id { get; set; }

    public string Name { get; set; }

    public int Age { get; set; }

    public string Department { get; set; }

}