using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Graphy.Test {
    [TestClass]
    public class ArithmeticTest {
        private void AssertResult(string exp, string result) { Assert.AreEqual(Expression.Evaluate(exp).Result, result); }

        [TestMethod]
        public void AdditionTest() { // −∠ⅈ∞
            Calculator.settings.Complex = true;
            Calculator.settings.Radians = false;
            Calculator.settings.PolarForm = false;
            AssertResult("", "0");
            AssertResult(" ", "0");
            AssertResult("5+5", "10");
            AssertResult("5 + 5", "10");
            AssertResult(" 5+5", "10");
            AssertResult("5+5 ", "10");
            AssertResult("5      +               5", "10");
            AssertResult("5+0", "5");
            AssertResult("−5+3", "−2");
            AssertResult("∞+1", "∞");
            AssertResult("−∞+1", "−∞");
            AssertResult("(5+1)+1", "7");
            AssertResult("−(5+1)+1", "−5");
            AssertResult("5+ⅈ+3", "8+ⅈ");
            AssertResult("2+2ⅈ+ⅈ", "2+3ⅈ");
            AssertResult("3∠0+1", "4");
            AssertResult("3∠90+1", "1+3ⅈ");
            AssertResult("3∠90+3ⅈ", "6ⅈ");
            Calculator.settings.PolarForm = true;
            AssertResult("3∠0+1", "4");
            AssertResult("3∠90+1", "3.16227766∠71.565051177");
            Calculator.settings.Radians = true;
            AssertResult("3ⅈ", "3∠1.570796327");
        }

        [TestMethod]
        public void SubtractionTest() {
            Calculator.settings.Radians = false;
            Calculator.settings.PolarForm = false;
            AssertResult("5-5", "0");
            AssertResult("6-5", "1");
            AssertResult("6-5+4", "5");
            AssertResult("(2+2)-5", "−1");
            AssertResult("5+ⅈ-5", "ⅈ");
            AssertResult("4-ⅈ", "4-ⅈ");
            AssertResult("∞-1", "∞");
            AssertResult("−∞-1", "−∞");
            AssertResult("5-0", "5");
        }

        [TestMethod]
        public void MultiplicationTest() {
            Calculator.settings.PolarForm = false;
            Calculator.settings.Radians = false;
            AssertResult("5*5", "25");
            AssertResult("5*(0-5)", "−25");
            AssertResult("5+5*5+3", "33");
            AssertResult("2*∞", "∞");
            AssertResult("2*−∞", "−∞");
            AssertResult("−2*∞", "−∞");
            AssertResult("5*(2+ⅈ)", "10+5ⅈ");
            Calculator.settings.PolarForm = true;
            AssertResult("5∠30*6∠60", "30∠90");
            //AssertResult("5∠(10+20)*6∠60", "30∠90");
        }

        [TestMethod]
        public void DivisionTest() {
            Calculator.settings.PolarForm = false;
            AssertResult("5/5", "1");
            AssertResult("20/5", "4");
            AssertResult("−20/5", "−4");
            AssertResult("20/−5", "−4");
            AssertResult("−20/−5", "4");
            Calculator.settings.AllowZeroDenominator = false;
            try {
                AssertResult("5/0", "0");
                Assert.Fail();
            } catch(ZeroDenominatorException) { }
            Calculator.settings.AllowZeroDenominator = true;
            AssertResult("5/0", "∞");
            AssertResult("(5+1)/3", "2");
            AssertResult("(6+2ⅈ)/2", "3+ⅈ");
        }
    }
}