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// http://numerics.mathdotnet.com
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namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single
{
    using System;
    using System.Globalization;
    using LinearAlgebra.Single;
    using NUnit.Framework;

    /// <summary>
    /// Sparse vector text handling tests.
    /// </summary>
    public class SparseVectorTextHandlingTest
    {
        /// <summary>
        /// Can parse a float sparse vectors with invariant culture.
        /// </summary>
        /// <param name="stringToParse">String to parse.</param>
        /// <param name="expectedToString">Expected result.</param>
        [TestCase("2", "2")]
        [TestCase("(3)", "3")]
        [TestCase("[1,2,3]", "1,2,3")]
        [TestCase(" [ 1 , 2 , 3 ] ", "1,2,3")]
        [TestCase(" [ -1 , 2 , +3 ] ", "-1,2,3")]
        [TestCase(" [1.2,3.4 , 5.6] ", "1.2,3.4,5.6")]
        public void CanParseSingleSparseVectorsWithInvariant(string stringToParse, string expectedToString)
        {
            var formatProvider = CultureInfo.InvariantCulture;
            var vector = SparseVector.Parse(stringToParse, formatProvider);

            Assert.AreEqual(expectedToString, vector.ToString(formatProvider));
        }

        /// <summary>
        /// Can parse a float sparse vectors with culture.
        /// </summary>
        /// <param name="stringToParse">String to parse.</param>
        /// <param name="expectedToString">Expected result.</param>
        /// <param name="culture">Culture name.</param>
        [TestCase(" 1.2,3.4 , 5.6 ", "1.2,3.4,5.6", "en-US")]
        [TestCase(" 1.2;3.4 ; 5.6 ", "1.2;3.4;5.6", "de-CH")]
        [TestCase(" 1,2;3,4 ; 5,6 ", "1,2;3,4;5,6", "de-DE")]
        public void CanParseSingleSparseVectorsWithCulture(string stringToParse, string expectedToString, string culture)
        {
            var formatProvider = new CultureInfo(culture);
            var vector = SparseVector.Parse(stringToParse, formatProvider);

            Assert.AreEqual(expectedToString, vector.ToString(formatProvider));
        }

        /// <summary>
        /// Can parse float sparse vectors.
        /// </summary>
        /// <param name="vectorAsString">Vector as string.</param>
        [TestCase("15")]
        [TestCase("1{0}2{1}3{0}4{1}5{0}6")]
        public void CanParseSingleSparseVectors(string vectorAsString)
        {
            var mappedString = String.Format(
                vectorAsString,
                CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator,
                CultureInfo.CurrentCulture.TextInfo.ListSeparator);

            var vector = SparseVector.Parse(mappedString);

            Assert.AreEqual(mappedString, vector.ToString());
        }

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

        /// <summary>
        /// Can try parse a float sparse vector.
        /// </summary>
        [Test]
        public void CanTryParseSingleSparseVector()
        {
            var data = new[] { 1.2f, 3.4f, 5.6e-10f };
            var text = String.Format(
                "{1}{0}{2}{0}{3}",
                CultureInfo.CurrentCulture.TextInfo.ListSeparator,
                data[0],
                data[1],
                data[2]);

            SparseVector vector;
            var ret = SparseVector.TryParse(text, out vector);
            Assert.IsTrue(ret);
            AssertHelpers.AlmostEqualList(data, vector.ToArray(), 1e-15);

            ret = SparseVector.TryParse(text, CultureInfo.CurrentCulture, out vector);
            Assert.IsTrue(ret);
            AssertHelpers.AlmostEqualList(data, vector.ToArray(), 1e-15);
        }

        /// <summary>
        /// Try parse a bad value with invariant returns <c>false</c>.
        /// </summary>
        /// <param name="str">Input string.</param>
        [TestCase(null)]
        [TestCase("")]
        [TestCase(",")]
        [TestCase("1,")]
        [TestCase(",1")]
        [TestCase("1,2,")]
        [TestCase(",1,2,")]
        [TestCase("1,,2,,3")]
        [TestCase("1e+")]
        [TestCase("1e")]
        [TestCase("()")]
        [TestCase("[  ]")]
        public void TryParseBadValueWithInvariantReturnsFalse(string str)
        {
            SparseVector vector;
            var ret = SparseVector.TryParse(str, CultureInfo.InvariantCulture, out vector);
            Assert.IsFalse(ret);
            Assert.IsNull(vector);
        }
    }
}