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

    /// <summary>
    /// Dense vector text handling tests.
    /// </summary>
    [TestFixture]
    public class DenseVectorTextHandlingTest
    {
        /// <summary>
        /// Can parse a Complex dense vectors with invariant culture.
        /// </summary>
        /// <param name="stringToParse">String to parse.</param>
        /// <param name="expectedToString">Expected result.</param>
        [TestCase("2", "(2, 0)")]
        [TestCase("(3)", "(3, 0)")]
        [TestCase("[1,2,3]", "(1, 0) (2, 0) (3, 0)")]
        [TestCase(" [ 1.1 , 2.1 , 3.1 ] ", "(1.1, 0) (2.1, 0) (3.1, 0)")]
        [TestCase(" [ -1.1 , 2.1 , +3.1 ] ", "(-1.1, 0) (2.1, 0) (3.1, 0)")]
        [TestCase(" [1.2,3.4 , 5.6] ", "(1.2, 0) (3.4, 0) (5.6, 0)")]
        [TestCase("[1+1i,2+1i,3+1i]", "(1, 1) (2, 1) (3, 1)")]
        [TestCase(" [ 1.1 + 1i , 2.1+1i , 3.1+1i ] ", "(1.1, 1) (2.1, 1) (3.1, 1)")]
        [TestCase(" [ -1.1 + 1i , 2.1-1i , +3.1+1i ] ", "(-1.1, 1) (2.1, -1) (3.1, 1)")]
        [TestCase(" [1.2+2.3i ,3.4+4.5i , 5.6+ 6.7i] ", "(1.2, 2.3) (3.4, 4.5) (5.6, 6.7)")]
        public void CanParseComplexDenseVectorsWithInvariant(string stringToParse, string expectedToString)
        {
            var formatProvider = CultureInfo.InvariantCulture;
            var vector = DenseVector.Parse(stringToParse, formatProvider);

            Assert.AreEqual(expectedToString, vector.ToVectorString(1, int.MaxValue, 1, "G", formatProvider));
        }

        /// <summary>
        /// Can parse a Complex dense vectors with culture.
        /// </summary>
        /// <param name="stringToParse">String to parse.</param>
        /// <param name="expectedToString">Expected result.</param>
        /// <param name="culture">Culture name.</param>
        [TestCase(" 1.2 + 1i , 3.4 + 1i , 5.6 + 1i ", "(1.2, 1) (3.4, 1) (5.6, 1)", "en-US")]
        [TestCase(" 1.2 + 1i ; 3.4 + 1i ; 5.6 + 1i ", "(1.2, 1) (3.4, 1) (5.6, 1)", "de-CH")]
#if !PORTABLE
        [TestCase(" 1,2 + 1i ; 3,4 + 1i ; 5,6 + 1i ", "(1,2, 1) (3,4, 1) (5,6, 1)", "de-DE")]
#endif
        public void CanParseComplexDenseVectorsWithCulture(string stringToParse, string expectedToString, string culture)
        {
            var formatProvider = new CultureInfo(culture);
            var vector = DenseVector.Parse(stringToParse, formatProvider);

            Assert.AreEqual(expectedToString, vector.ToVectorString(1, int.MaxValue, 1, "G", formatProvider));
        }

        /// <summary>
        /// Parse if missing closing paren throws <c>FormatException</c>.
        /// </summary>
        [Test]
        public void ParseIfMissingClosingParenThrowsFormatException()
        {
            Assert.Throws<FormatException>(() => DenseVector.Parse("(1"));
            Assert.Throws<FormatException>(() => DenseVector.Parse("[1"));
        }

        /// <summary>
        /// Try parse a bad value with invariant returns <c>false</c>.
        /// </summary>
        /// <param name="str">Input string.</param>
        [TestCase(null)]
        [TestCase("")]
        [TestCase(",")]
        [TestCase("1e+")]
        [TestCase("1e")]
        [TestCase("()")]
        [TestCase("[  ]")]
        public void TryParseBadValueWithInvariantReturnsFalse(string str)
        {
            DenseVector vector;
            var ret = DenseVector.TryParse(str, CultureInfo.InvariantCulture, out vector);
            Assert.IsFalse(ret);
            Assert.IsNull(vector);
        }
    }
}