// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Utilities.cs" company="HandBrake Project (http://handbrake.fr)">
//   This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
//   Defines the Utilities type.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace HandBrake.Interop.Helpers
{
    using HandBrake.Interop.Model.Encoding;

    /// <summary>
    /// The utilities.
    /// </summary>
    public static class Utilities
	{
        /// <summary>
        /// Get the Greatest Common Factor
        /// </summary>
        /// <param name="a">
        /// The a.
        /// </param>
        /// <param name="b">
        /// The b.
        /// </param>
        /// <returns>
        /// The greatest common factor
        /// </returns>
        public static int GreatestCommonFactor(int a, int b)
		{
			if (a == 0)
			{
				return b;
			}

			if (b == 0)
			{
				return a;
			}

			if (a > b)
			{
				return GreatestCommonFactor(a % b, b);
			}
            
            return GreatestCommonFactor(a, b % a);
		}

		/// <summary>
		/// Determines if the given audio encoder is a passthrough encoder choice.
		/// </summary>
		/// <param name="encoder">The audio encoder to examine.</param>
		/// <returns>True if the encoder is passthrough.</returns>
		public static bool IsPassthrough(AudioEncoder encoder)
		{
			return encoder == AudioEncoder.Ac3Passthrough ||
                   encoder == AudioEncoder.DtsHDPassthrough ||
                   encoder == AudioEncoder.DtsPassthrough ||
                   encoder == AudioEncoder.Mp3Passthru || 
                   encoder == AudioEncoder.AacPassthru ||
                   encoder == AudioEncoder.Passthrough;
		}
	}
}
