﻿using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using OfficeOpenXml;
using OfficeOpenXml.FormulaParsing.Excel.Operators;
using OfficeOpenXml.FormulaParsing.Exceptions;
using OfficeOpenXml.FormulaParsing.ExpressionGraph;

namespace EPPlusTest.Excel
{
    [TestClass]
    public class OperatorsTests
    {
        [TestMethod]
        public void OperatorPlusShouldThrowExceptionIfNonNumericOperand()
        {
            var result = Operator.Plus.Apply(new CompileResult(1, DataType.Integer), new CompileResult("a", DataType.String));
            Assert.AreEqual(ExcelErrorValue.Create(eErrorType.Value), result.Result);
        }

        [TestMethod]
        public void OperatorPlusShouldAddNumericStringAndNumber()
        {
            var result = Operator.Plus.Apply(new CompileResult(1, DataType.Integer), new CompileResult("2", DataType.String));
            Assert.AreEqual(3d, result.Result);
        }

        [TestMethod]
        public void OperatorMinusShouldThrowExceptionIfNonNumericOperand()
        {
            var result = Operator.Minus.Apply(new CompileResult(1, DataType.Integer), new CompileResult("a", DataType.String));
            Assert.AreEqual(ExcelErrorValue.Create(eErrorType.Value), result.Result);
        }

        [TestMethod]
        public void OperatorMinusShouldSubtractNumericStringAndNumber()
        {
            var result = Operator.Minus.Apply(new CompileResult(5, DataType.Integer), new CompileResult("2", DataType.String));
            Assert.AreEqual(3d, result.Result);
        }

        [TestMethod]
        public void OperatorDivideShouldReturnDivideByZeroIfRightOperandIsZero()
        {
            var result = Operator.Divide.Apply(new CompileResult(1d, DataType.Decimal), new CompileResult(0d, DataType.Decimal));
            Assert.AreEqual(ExcelErrorValue.Create(eErrorType.Div0), result.Result);
        }

        [TestMethod]
        public void OperatorDivideShouldDivideCorrectly()
        {
            var result = Operator.Divide.Apply(new CompileResult(9d, DataType.Decimal), new CompileResult(3d, DataType.Decimal));
            Assert.AreEqual(3d, result.Result);
        }

        [TestMethod]
        public void OperatorDivideShouldReturnValueErrorIfNonNumericOperand()
        {
            var result = Operator.Divide.Apply(new CompileResult(1, DataType.Integer), new CompileResult("a", DataType.String));
            Assert.AreEqual(ExcelErrorValue.Create(eErrorType.Value), result.Result);
        }

        [TestMethod]
        public void OperatorDivideShouldDivideNumericStringAndNumber()
        {
            var result = Operator.Divide.Apply(new CompileResult(9, DataType.Integer), new CompileResult("3", DataType.String));
            Assert.AreEqual(3d, result.Result);
        }

        [TestMethod]
        public void OperatorMultiplyShouldThrowExceptionIfNonNumericOperand()
        {
            Operator.Multiply.Apply(new CompileResult(1, DataType.Integer), new CompileResult("a", DataType.String));
        }

        [TestMethod]
        public void OperatoMultiplyShouldMultiplyNumericStringAndNumber()
        {
            var result = Operator.Multiply.Apply(new CompileResult(1, DataType.Integer), new CompileResult("3", DataType.String));
            Assert.AreEqual(3d, result.Result);
        }

        [TestMethod]
        public void OperatorConcatShouldConcatTwoStrings()
        {
            var result = Operator.Concat.Apply(new CompileResult("a", DataType.String), new CompileResult("b", DataType.String));
            Assert.AreEqual("ab", result.Result);
        }

        [TestMethod]
        public void OperatorConcatShouldConcatANumberAndAString()
        {
            var result = Operator.Concat.Apply(new CompileResult(12, DataType.Integer), new CompileResult("b", DataType.String));
            Assert.AreEqual("12b", result.Result);
        }

        [TestMethod]
        public void OperatorEqShouldReturnTruefSuppliedValuesAreEqual()
        {
            var result = Operator.Eq.Apply(new CompileResult(12, DataType.Integer), new CompileResult(12, DataType.Integer));
            Assert.IsTrue((bool)result.Result);
        }

        [TestMethod]
        public void OperatorEqShouldReturnFalsefSuppliedValuesDiffer()
        {
            var result = Operator.Eq.Apply(new CompileResult(11, DataType.Integer), new CompileResult(12, DataType.Integer));
            Assert.IsFalse((bool)result.Result);
        }

        [TestMethod]
        public void OperatorNotEqualToShouldReturnTruefSuppliedValuesDiffer()
        {
            var result = Operator.NotEqualsTo.Apply(new CompileResult(11, DataType.Integer), new CompileResult(12, DataType.Integer));
            Assert.IsTrue((bool)result.Result);
        }

        [TestMethod]
        public void OperatorNotEqualToShouldReturnFalsefSuppliedValuesAreEqual()
        {
            var result = Operator.NotEqualsTo.Apply(new CompileResult(11, DataType.Integer), new CompileResult(11, DataType.Integer));
            Assert.IsFalse((bool)result.Result);
        }

        [TestMethod]
        public void OperatorGreaterThanToShouldReturnTrueIfLeftIsSetAndRightIsNull()
        {
            var result = Operator.GreaterThan.Apply(new CompileResult(11, DataType.Integer), new CompileResult(null, DataType.Empty));
            Assert.IsTrue((bool)result.Result);
        }

        [TestMethod]
        public void OperatorGreaterThanToShouldReturnTrueIfLeftIs11AndRightIs10()
        {
            var result = Operator.GreaterThan.Apply(new CompileResult(11, DataType.Integer), new CompileResult(10, DataType.Integer));
            Assert.IsTrue((bool)result.Result);
        }

        [TestMethod]
        public void OperatorExpShouldReturnCorrectResult()
        {
            var result = Operator.Exp.Apply(new CompileResult(2, DataType.Integer), new CompileResult(3, DataType.Integer));
            Assert.AreEqual(8d, result.Result);
        }
    }
}