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using System;
using MathNet.Numerics.LinearAlgebra.Storage;

namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex
{
    using System.Numerics;
    using LinearAlgebra.Complex;
    using LinearAlgebra.Generic;

    /// <summary>
    /// User-defined matrix implementation (internal class for testing purposes)
    /// </summary>
    internal class UserDefinedMatrix : Matrix
    {
        class UserDefinedMatrixStorage : MatrixStorage<Complex>
        {
            public readonly Complex[,] Data;

            public UserDefinedMatrixStorage(int rowCount, int columnCount)
                : base(rowCount, columnCount)
            {
                Data = new Complex[rowCount, columnCount];
            }

            public UserDefinedMatrixStorage(int rowCount, int columnCount, Complex[,] data)
                : base(rowCount, columnCount)
            {
                Data = data;
            }

            public override Complex At(int row, int column)
            {
                return Data[row, column];
            }

            public override void At(int row, int column, Complex value)
            {
                Data[row, column] = value;
            }

            public override void Clear()
            {
                Array.Clear(Data, 0, RowCount * ColumnCount);
            }
        }

        readonly UserDefinedMatrixStorage _storage;
        readonly Complex[,] _data;

        private UserDefinedMatrix(UserDefinedMatrixStorage storage)
            : base(storage)
        {
            _storage = storage;
            _data = _storage.Data;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="UserDefinedMatrix"/> class. This matrix is square with a given size.
        /// </summary>
        /// <param name="order">the size of the square matrix.</param>
        public UserDefinedMatrix(int order)
            : this(new UserDefinedMatrixStorage(order, order))
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="UserDefinedMatrix"/> class.
        /// </summary>
        /// <param name="rows">The number of rows.</param>
        /// <param name="columns">The number of columns.</param>
        public UserDefinedMatrix(int rows, int columns)
            : this(new UserDefinedMatrixStorage(rows, columns))
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="UserDefinedMatrix"/> class from a 2D array. 
        /// </summary>
        /// <param name="data">The 2D array to create this matrix from.</param>
        public UserDefinedMatrix(Complex[,] data)
            : this(new UserDefinedMatrixStorage(data.GetLength(0), data.GetLength(1), (Complex[,]) data.Clone()))
        {
        }

        /// <summary>
        /// Creates a matrix for the given number of rows and columns.
        /// </summary>
        /// <param name="numberOfRows">The number of rows.</param>
        /// <param name="numberOfColumns">The number of columns.</param>
        /// <returns>A matrix with the given dimensions.</returns>
        public override Matrix<Complex> CreateMatrix(int numberOfRows, int numberOfColumns)
        {
            return new UserDefinedMatrix(numberOfRows, numberOfColumns);
        }

        /// <summary>
        /// Creates a vector with a the given dimension.
        /// </summary>
        /// <param name="size">The size of the vector.</param>
        /// <returns>A vector with the given dimension.</returns>
        public override Vector<Complex> CreateVector(int size)
        {
            return new UserDefinedVector(size);
        }

        /// <summary>
        /// Initializes a square matrix with all zero's except for ones on the diagonal.
        /// </summary>
        /// <param name="order">the size of the square matrix.</param>
        /// <returns>A identity matrix.</returns>
        public static UserDefinedMatrix Identity(int order)
        {
            var m = new UserDefinedMatrix(order, order);
            for (var i = 0; i < order; i++)
            {
                m[i, i] = 1.0;
            }

            return m;
        }
    }
}