using Xunit;

using MathEngine.AST.Nodes;
using MathEngine.Tokenizer;

using static MathEngine.Tokenizer.Token;
using MathEngine.Types;

namespace EngineTests.Parser_Tests.Nodes
{
    /// <summary>
    /// Class for testing the NodeFactory
    /// </summary>
    public class NodeFactoryTests
    {
        /// <summary>
        /// Test the NodeFactory test BinaryNode creation on all defined operations
        /// </summary>
        [Fact]
        public void TestNodeFactoryBinaryNodesOnDefinedOperations()
        {
            NumericNode node1 = new(new DecimalValue(200));
            NumericNode node2 = new(new DecimalValue(100));

            Token plus = Token.Plus;
            Token minus = Token.Minus;
            Token multiply = Token.Multiply;
            Token divide = Token.Divide;

            BaseNode addNode = NodeFactory.CreateBinaryNode(plus, node1, node2);
            BaseNode subtractNode = NodeFactory.CreateBinaryNode(minus, node1, node2);
            BaseNode multiplyNode = NodeFactory.CreateBinaryNode(multiply, node1, node2);
            BaseNode divideNode = NodeFactory.CreateBinaryNode(divide, node1, node2);
        }

        /// <summary>
        /// Test the NodeFactory test BinaryNode creation on exponentiation raises exception
        /// </summary>
        [Fact]
        public void TestNodeFactoryBinaryNodesOnExponentiationRaisesException()
        {
            NumericNode<decimal> node1 = new(200);
            NumericNode<decimal> node2 = new(100);

            Token exp = new("^", TokenType.Exponentiation);
            try
            {
                BaseNode expBiinary = NodeFactory.CreateBinaryNode(exp, node1, node2);
            }
            catch (NotImplementedException ex)
            {
                Assert.Equal("Exponentiation is not supported at this time!", ex.Message);
            }
        }

        /// <summary>
        /// Test the NodeFactory test BinaryNode creation on invalid operation token raises exception
        /// </summary>
        [Fact]
        public void TestNodeFactoryBinaryNodesOnInvalidOperationTokenRaisesException()
        {
            NumericNode<decimal> node1 = new(200);
            NumericNode<decimal> node2 = new(100);

            Token invalid = new("(", TokenType.OpenBracket);
            try
            {
                BaseNode expBiinary = NodeFactory.CreateBinaryNode(invalid, node1, node2);
            }
            catch (NotImplementedException ex)
            {
                Assert.Equal("Attempted to create a BinaryNode with an invalid operation!", ex.Message);
            }
        }


        /// <summary>
        /// Test the NodeFactory test NumericNode creation on all defined types
        /// </summary>
        [Fact]
        public void TestNodeFactoryNumericNodesOnDefinedTypes()
        {
            Assert.True(true);
            return;
            //Token test_token2 = new("100.5", TokenType.Numeric);

            //BaseNode testNode2 = NodeFactory.CreateNumericNode();
        }

        /// <summary>
        /// Test the NodeFactory test NumericNode creation on Complex type RaisesException
        /// </summary>
        [Fact]
        public void TestNodeFactoryNumericNodesOnComplexTypeRaisesException()
        {
            Assert.True(true);
            return;
            //try
            //{
            //    Token comp = new("1+i", TokenType.Numeric);
            //    BaseNode testNode = NodeFactory.CreateNumericNode();
            //}
            //catch (NotImplementedException ex)
            //{
            //    Assert.Equal(ex.Message, "Complex Numbers are not implemented at this time");
            //}
        }

        /// <summary>
        /// Test the NodeFactory test NumericNode creation on invalid type Raises Exception
        /// </summary>
        [Fact]
        public void TestNodeFactoryNumericNodesOnInvalidTypeRaisesException()
        {
            Assert.True(true);
            return;
            //try
            //{
            //    Token comp = new("(", TokenType.CloseBrace);
            //    BaseNode testNode = NodeFactory.CreateNumericNode();
            //}
            //catch (InvalidDataException ex)
            //{
            //    Assert.Equal(ex.Message, "Attempted to create a NumericNode with non numeric data!");
            //}
        }
    }
}