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namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex
{
    using System.Numerics;
    using NUnit.Framework;

    /// <summary>
    /// Abstract class with the common set of matrix tests
    /// </summary>
    public abstract partial class MatrixTests : MatrixLoader
    {
        /// <summary>
        /// Can transpose a matrix.
        /// </summary>
        /// <param name="name">Matrix name.</param>
        [TestCase("Singular3x3")]
        [TestCase("Square3x3")]
        [TestCase("Square4x4")]
        [TestCase("Tall3x2")]
        [TestCase("Wide2x3")]
        public void CanTransposeMatrix(string name)
        {
            var matrix = CreateMatrix(TestData2D[name]);
            var transpose = matrix.Transpose();

            Assert.AreNotSame(matrix, transpose);
            Assert.AreEqual(matrix.RowCount, transpose.ColumnCount);
            Assert.AreEqual(matrix.ColumnCount, transpose.RowCount);
            for (var i = 0; i < matrix.RowCount; i++)
            {
                for (var j = 0; j < matrix.ColumnCount; j++)
                {
                    Assert.AreEqual(matrix[i, j], transpose[j, i]);
                }
            }
        }

        /// <summary>
        /// Can conjugate transpose a matrix.
        /// </summary>
        /// <param name="name">Matrix name.</param>
        [TestCase("Singular3x3")]
        [TestCase("Square3x3")]
        [TestCase("Square4x4")]
        [TestCase("Tall3x2")]
        [TestCase("Wide2x3")]
        public void CanConjugateTransposeMatrix(string name)
        {
            var matrix = CreateMatrix(TestData2D[name]);
            var transpose = matrix.ConjugateTranspose();

            Assert.AreNotSame(matrix, transpose);
            Assert.AreEqual(matrix.RowCount, transpose.ColumnCount);
            Assert.AreEqual(matrix.ColumnCount, transpose.RowCount);
            for (var i = 0; i < matrix.RowCount; i++)
            {
                for (var j = 0; j < matrix.ColumnCount; j++)
                {
                    Assert.AreEqual(matrix[i, j], transpose[j, i].Conjugate());
                }
            }
        }

        /// <summary>
        /// Can compute Frobenius norm.
        /// </summary>
        [Test]
        public virtual void CanComputeFrobeniusNorm()
        {
            var matrix = TestMatrices["Square3x3"];
            AssertHelpers.AlmostEqual(11.1427106217473, matrix.FrobeniusNorm(), 14);

            matrix = TestMatrices["Wide2x3"];
            AssertHelpers.AlmostEqual(5.29055762656452, matrix.FrobeniusNorm(), 14);

            matrix = TestMatrices["Tall3x2"];
            AssertHelpers.AlmostEqual(7.86574853399217, matrix.FrobeniusNorm(), 14);
        }

        /// <summary>
        /// Can compute Infinity norm.
        /// </summary>
        [Test]
        public virtual void CanComputeInfinityNorm()
        {
            var matrix = TestMatrices["Square3x3"];
            AssertHelpers.AlmostEqual(16.7777033201323, matrix.InfinityNorm(), 14);

            matrix = TestMatrices["Wide2x3"];
            AssertHelpers.AlmostEqual(7.3514039993641, matrix.InfinityNorm(), 14);

            matrix = TestMatrices["Tall3x2"];
            AssertHelpers.AlmostEqual(10.1023756128209, matrix.InfinityNorm(), 14);
        }

        /// <summary>
        /// Can compute L1 norm.
        /// </summary>
        [Test]
        public virtual void CanComputeL1Norm()
        {
            var matrix = TestMatrices["Square3x3"];
            AssertHelpers.AlmostEqual(12.5401248319437, matrix.L1Norm(), 14);

            matrix = TestMatrices["Wide2x3"];
            AssertHelpers.AlmostEqual(5.86479712463225, matrix.L1Norm(), 14);

            matrix = TestMatrices["Tall3x2"];
            AssertHelpers.AlmostEqual(9.49338601320024, matrix.L1Norm(), 14);
        }

        /// <summary>
        /// Can compute L2 norm.
        /// </summary>
        [Test]
        public virtual void CanComputeL2Norm()
        {
            var matrix = TestMatrices["Square3x3"];
            AssertHelpers.AlmostEqual(10.638175225153, matrix.L2Norm(), 14);

            matrix = TestMatrices["Wide2x3"];
            AssertHelpers.AlmostEqual(5.2058554445283, matrix.L2Norm(), 14);
            matrix = TestMatrices["Tall3x2"];
            AssertHelpers.AlmostEqual(7.35826643761172, matrix.L2Norm(), 14);
        }

        /// <summary>
        /// Can check if a matrix is symmetric.
        /// </summary>
        [Test]
        public virtual void CanCheckIfMatrixIsSymmetric()
        {
            var matrix = TestMatrices["Symmetric3x3"];
            Assert.IsTrue(matrix.IsSymmetric);

            matrix = TestMatrices["Square3x3"];
            Assert.IsFalse(matrix.IsSymmetric);
        }
    }
}