using Elwig.Helpers;

namespace Tests {
    [TestClass]
    public class HelpersUtilsTest {

        private static readonly double[,] Gradation = new double[,] {
            { 14.0,  68.0 },
            { 15.0,  73.0 },
            { 17.1,  84.0 },
            { 19.0,  94.0 },
            { 21.0, 105.0 },
            { 25.0, 127.0 },
            { 27.1, 139.0 },
            { 30.0, 156.0 },
        };

        [TestMethod]
        public void Test_KmwToOe() {
            for (int i = 0; i < Gradation.GetLength(0); i++) {
                Assert.AreEqual(Gradation[i, 1], Utils.KmwToOe(Gradation[i, 0]));
            }
        }

        [TestMethod]
        public void Test_OeToKmw() {
            for (int i = 0; i < Gradation.GetLength(0); i++) {
                Assert.AreEqual(Gradation[i, 0], Utils.OeToKmw(Gradation[i, 1]));
            }
        }

        [TestMethod]
        public void Test_DecFromDb() {
            Assert.AreEqual(10.67M, Utils.DecFromDb(10670, 3));
            Assert.AreEqual(-100.9999M, Utils.DecFromDb(-1009999, 4));
            Assert.AreEqual(0.01M, Utils.DecFromDb(1, 2));
        }

        [TestMethod]
        public void Test_DecToDb() {
            Assert.AreEqual(21948, Utils.DecToDb(219.48M, 2));
            Assert.AreEqual(-12345, Utils.DecToDb(-1.2345M, 4));
            Assert.AreEqual(99190, Utils.DecToDb(99190, 0));
            Assert.AreEqual(817910, Utils.DecToDb(817.9099M, 3));
            Assert.AreEqual(-561894, Utils.DecToDb(-5618.944M, 2));
        }

        [TestMethod]
        public void Test_Modulo() {
            Assert.AreEqual(1, Utils.Modulo("1", 2));
            Assert.AreEqual(1, Utils.Modulo("12", 11));
            Assert.AreEqual(1, Utils.Modulo("65", 16));
            Assert.AreEqual(4, Utils.Modulo("91746381048364", 10));
            Assert.AreEqual(1, Utils.Modulo("210501700012345678131468", 97));
            Assert.ThrowsException<ArgumentException>(() => Utils.Modulo("", 4));
            Assert.ThrowsException<ArgumentException>(() => Utils.Modulo("1ab", 5));
            Assert.ThrowsException<ArgumentException>(() => Utils.Modulo("123", 1));
            Assert.ThrowsException<ArgumentException>(() => Utils.Modulo("456", 0));
            Assert.ThrowsException<ArgumentException>(() => Utils.Modulo("789", -1));
        }
    }
}