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namespace MathNet.Numerics.LinearAlgebra.Complex
{
    using System.Numerics;
    using Factorization;
    using Generic;
    using Generic.Factorization;

    /// <summary>
    /// Extension methods which return factorizations for the various matrix classes.
    /// </summary>
    public static class ExtensionMethods
    {
        /// <summary>
        /// Computes the Cholesky decomposition for a matrix.
        /// </summary>
        /// <param name="matrix">The matrix to factor.</param>
        /// <returns>The Cholesky decomposition object.</returns>
        public static Cholesky Cholesky(this Matrix<Complex> matrix)
        {
            return (Cholesky)Cholesky<Complex>.Create(matrix);
        }

        /// <summary>
        /// Computes the LU decomposition for a matrix.
        /// </summary>
        /// <param name="matrix">The matrix to factor.</param>
        /// <returns>The LU decomposition object.</returns>
        public static LU LU(this Matrix<Complex> matrix)
        {
            return (LU)LU<Complex>.Create(matrix);
        }

        /// <summary>
        /// Computes the QR decomposition for a matrix.
        /// </summary>
        /// <param name="matrix">The matrix to factor.</param>
        /// <param name="method">The type of QR factorization to perform.</param>
        /// <returns>The QR decomposition object.</returns>
        public static QR QR(this Matrix<Complex> matrix, QRMethod method = QRMethod.Full)
        {
            return (QR)QR<Complex>.Create(matrix, method);
        }

        /// <summary>
        /// Computes the QR decomposition for a matrix using Modified Gram-Schmidt Orthogonalization.
        /// </summary>
        /// <param name="matrix">The matrix to factor.</param>
        /// <returns>The QR decomposition object.</returns>
        public static GramSchmidt GramSchmidt(this Matrix<Complex> matrix)
        {
            return (GramSchmidt)GramSchmidt<Complex>.Create(matrix);
        }

        /// <summary>
        /// Computes the SVD decomposition for a matrix.
        /// </summary>
        /// <param name="matrix">The matrix to factor.</param>
        /// <param name="computeVectors">Compute the singular U and VT vectors or not.</param>
        /// <returns>The SVD decomposition object.</returns>
        public static Svd Svd(this Matrix<Complex> matrix, bool computeVectors)
        {
            return (Svd)Svd<Complex>.Create(matrix, computeVectors);
        }

        /// <summary>
        /// Computes the EVD decomposition for a matrix.
        /// </summary>
        /// <param name="matrix">The matrix to factor.</param>
        /// <returns>The EVD decomposition object.</returns>
        public static Evd Evd(this Matrix<Complex> matrix)
        {
            return (Evd)Evd<Complex>.Create(matrix);
        }
    }
}