using System;
using System.Globalization;
using System.Net;
using System.Net.NetworkInformation;

namespace GSF.Net.Snmp
{
    /// <summary>
    /// Class Helper.
    /// </summary>
    public static class Helper
    {
        /// <summary>
        /// Converts <see cref="IP" /> to <see cref="IPAddress" />.
        /// </summary>
        /// <param name="ip">The <see cref="IP" /> object.</param>
        /// <returns>The <see cref="IPAddress" /> object.</returns>
        public static IPAddress ToIPAddress(this IP ip)
        {
            return new IPAddress(ip.GetRaw());
        }

        /// <summary>
        /// Converts <see cref="OctetString" /> to <see cref="PhysicalAddress" />.
        /// </summary>
        /// <param name="address">The <see cref="OctetString" /> object that holds the address.</param>
        /// <returns>The <see cref="PhysicalAddress" /> object.</returns>
        /// <exception cref="System.InvalidCastException"><paramref name="address"/> length is not equal to 6.</exception>
        public static PhysicalAddress ToPhysicalAddress(this OctetString address)
        {
            byte[] raw = address.GetRaw();
            if (raw.Length != 6)
            {
                throw new InvalidCastException(string.Format(CultureInfo.InvariantCulture, "the data length is not equal to 6: {0}", raw.Length));
            }

            return new PhysicalAddress(raw);
        }
    }
}