namespace BuildingDirectory.Model;

/// <summary>
///     Represents a business card of a company employee
/// </summary>
public sealed class BusinessCard
{
    /// <summary>
    ///  Creates a new instance of a business card
    /// </summary>
    /// <param name="firstName">First name of the employee</param>
    /// <param name="lastName">Last name of the employee</param>
    /// <param name="department">Department the employee works at</param>
    /// <param name="phoneNumber">Phone number of the employee</param>
    /// <param name="eMail">E-Mail address of the employee</param>
    public BusinessCard(string firstName, string lastName, string department, string? phoneNumber, string eMail)
    {
        FirstName = firstName;
        LastName = lastName;
        Department = department;
        PhoneNumber = phoneNumber;
        EMail = eMail;
    }

    /// <summary>
    ///     Gets the first name of the employee
    /// </summary>
    public string FirstName { get; }
    
    /// <summary>
    ///     Gets the last name of the employee
    /// </summary>
    public string LastName { get; }
    
    /// <summary>
    ///     Gets the name of the department the employee works at
    /// </summary>
    public string Department { get; }
    
    /// <summary>
    ///     Gets the phone number of the employee
    /// </summary>
    public string? PhoneNumber { get; }
    
    /// <summary>
    ///     Gets the E-Mail address of the employee
    /// </summary>
    public string EMail { get; }

    /// <summary>
    ///     Determines if this object is equal to another
    /// </summary>
    /// <param name="obj">Other object to compare to</param>
    /// <returns>True if the objects are equal; false otherwise</returns>
    public override bool Equals(object? obj)
    {
        if (obj is not BusinessCard other)
        {
            return false;
        }
        
        return FirstName == other.FirstName && LastName == other.LastName;
    }

    /// <summary>
    ///     Calculates the hash code for this object
    /// </summary>
    /// <returns>Numeric hash code</returns>
    // Uses XOR to combine the bits of each hash code
    public override int GetHashCode() => FirstName.GetHashCode() ^ LastName.GetHashCode();
}