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using MathNet.Numerics.LinearAlgebra.Solvers.Status;

namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
{

#if NOSYSNUMERICS
    using Complex = Numerics.Complex;
#else
    using Complex = System.Numerics.Complex;
#endif

    /// <summary>
    /// Defines the interface for <see cref="IIterativeSolver"/> classes that solve the matrix equation Ax = b in
    /// an iterative manner.
    /// </summary>
    public interface IIterativeSolver 
    {
        /// <summary>
        /// Stops the solve process. 
        /// </summary>
        /// <remarks>
        /// Note that it may take an indetermined amount of time for the solver to actually stop the process.
        /// </remarks>
        void StopSolve();

        /// <summary>
        /// Sets the <see cref="IIterator"/> that will be used to track the iterative process.
        /// </summary>
        /// <param name="iterator">The iterator.</param>
        void SetIterator(IIterator iterator);

        /// <summary>
        /// Gets the status of the iteration once the calculation is finished.
        /// </summary>
        ICalculationStatus IterationResult { get; }

        /// <summary>
        /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
        /// solution vector and x is the unknown vector.
        /// </summary>
        /// <param name="matrix">The coefficient matrix, <c>A</c>.</param>
        /// <param name="vector">The solution vector, <c>b</c>.</param>
        /// <returns>The result vector, <c>x</c>.</returns>
        Vector<Complex> Solve(Matrix<Complex> matrix, Vector<Complex> vector);

        /// <summary>
        /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
        /// solution vector and x is the unknown vector.
        /// </summary>
        /// <param name="matrix">The coefficient matrix, <c>A</c>.</param>
        /// <param name="input">The solution vector, <c>b</c></param>
        /// <param name="result">The result vector, <c>x</c></param>
        void Solve(Matrix<Complex> matrix, Vector<Complex> input, Vector<Complex> result);

        /// <summary>
        /// Solves the matrix equation AX = B, where A is the coefficient matrix, B is the
        /// solution matrix and X is the unknown matrix.
        /// </summary>
        /// <param name="matrix">The coefficient matrix, <c>A</c>.</param>
        /// <param name="input">The solution matrix, <c>B</c>.</param>
        /// <returns>The result matrix, <c>X</c>.</returns>
        Matrix<Complex> Solve(Matrix<Complex> matrix, Matrix<Complex> input);

        /// <summary>
        /// Solves the matrix equation AX = B, where A is the coefficient matrix, B is the
        /// solution matrix and X is the unknown matrix.
        /// </summary>
        /// <param name="matrix">The coefficient matrix, <c>A</c>.</param>
        /// <param name="input">The solution matrix, <c>B</c>.</param>
        /// <param name="result">The result matrix, <c>X</c></param>
        void Solve(Matrix<Complex> matrix, Matrix<Complex> input, Matrix<Complex> result);
    }
}