using Xunit;

using MathEngine.AST.Nodes;
using MathEngine.Types;

namespace EngineTests.Parser_Tests.Nodes
{
    /// <summary>
    /// Class for testing the TreeNodes
    /// </summary>
    public class NumericNodeTests
    {
        /// <summary>
        /// Test two NumericNodes with same generic type can be added     
        /// /// </summary>
        [Fact]
        public void TestNumericNodeAdd()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            BaseNode result = testNode1 + testNode2;
            Assert.Equal("200", result.ToString());
        }

        /// <summary>
        /// Test two NumericNodes being added of different generic types raises exception
        /// </summary>
        [Fact]
        public void TestNumericNodeAddDifferentTypesRaisesException()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            try
            {
                BaseNode result = testNode1 + testNode2;
            }
            catch (InvalidOperationException ex)
            {
                Assert.Equal("Attempted Invalid operation", ex.Message);
            }
        }


        /// <summary>
        /// Test two NumericNodes with same generic type can be subtracted   
        /// /// </summary>
        [Fact]
        public void TestNumericNodeSubtract()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            BaseNode result = testNode1 - testNode2;
            Assert.Equal("0", result.ToString());
        }

        /// <summary>
        /// Test two NumericNodes being subtracted of different generic types raises exception
        /// </summary>
        [Fact]
        public void TestNumericNodeSubtractDifferentTypesRaisesException()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            try
            {
                BaseNode result = testNode1 - testNode2;
            }
            catch (InvalidOperationException ex)
            {
                Assert.Equal("Attempted Invalid operation", ex.Message);
            }
        }


        /// <summary>
        /// Test two NumericNodes with same generic type can be multiplied     
        /// </summary>
        [Fact]
        public void TestNumericNodeMultiply()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            BaseNode result = testNode1 * testNode2;
            Assert.Equal("10000", result.ToString());
        }

        /// <summary>
        /// Test two NumericNodes being multiplied of different generic types raises exception 
        /// </summary>
        [Fact]
        public void TestNumericNodeMultiplyDifferentTypesRaisesException()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            try
            {
                BaseNode result = testNode1 * testNode2;
            }
            catch (InvalidOperationException ex)
            {
                Assert.Equal("Attempted Invalid operation", ex.Message);
            }
        }


        /// <summary>
        /// Test two NumericNodes with same generic type can be divided   
        /// /// </summary>
        [Fact]
        public void TestNumericNodeDivide()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            BaseNode result = testNode1 / testNode2;
            Assert.Equal("1", result.ToString());
        }

        /// <summary>
        /// Test two NumericNodes being divided of different generic types raises exception 
        /// </summary>
        [Fact]
        public void TestNumericNodeDividedDifferentTypesRaisesException()
        {
            NumericNode<DecimalValue> testNode1 = new(new DecimalValue(100));
            NumericNode<DecimalValue> testNode2 = new(new DecimalValue(100));
            try
            {
                BaseNode result = testNode1 / testNode2;
            }
            catch (InvalidOperationException ex)
            {
                Assert.Equal("Attempted Invalid operation", ex.Message);
            }
        }
    }
}