namespace BuildingDirectory.Model;

/// <summary>
///     Represents a company with employees
/// </summary>
public sealed class Company
{
    private readonly MyDictionary<BusinessCard, int> _employeeRooms;

    /// <summary>
    ///     Creates a new instance of a company with the given name and the employees together
    ///     with their room numbers.
    ///     Employees are represented/identified by their <see cref="BusinessCard"/>
    /// </summary>
    /// <param name="employeeRooms">Employees and assigned room numbers</param>
    /// <param name="name">Name of the company</param>
    public Company(MyDictionary<BusinessCard, int> employeeRooms, string name)
    {
        _employeeRooms = employeeRooms;
        Name = name;
    }

    /// <summary>
    ///     Gets the name of the company
    /// </summary>
    public string Name { get; }

    /// <summary>
    ///     Gets the number of employees working for the company 
    /// </summary>
    public int NoOfEmployees => _employeeRooms.Count;

    /// <summary>
    ///     Returns the room number the clerk identified by the provided
    ///     <see cref="BusinessCard"/> resides at - if known
    /// </summary>
    /// <param name="businessCard">Identification of the employee</param>
    /// <returns>Room number if found; null otherwise</returns>
    public int? AskForRoom(BusinessCard businessCard)
    {
        bool found = _employeeRooms.TryGetValue(businessCard, out int room);
        return found ? room : null;
    }
    
}