using System.Globalization;
using FluentAssertions;
using NUnit.Framework;

namespace Developpez.Dotnet.Tests
{
    [TestFixture]
    public class NumbersTests
    {
        [Test]
        public void Generic_TryParse_Returns_Value_If_Input_Is_Valid()
        {
            const string input = "42";
            int? result = input.TryParse<int>();
            result.Should().Be(42);
        }

        [Test]
        public void Generic_TryParse_Returns_Null_If_Input_Is_Not_Valid()
        {
            const string input = "foo";
            int? result = input.TryParse<int>();
            result.Should().Be(null);
        }

        [Test]
        public void TryParseInt32_Returns_Value_If_Input_Is_Valid()
        {
            const string input = "42";
            int? result = Numbers.TryParseInt32(input);
            result.Should().Be(42);
        }

        [Test]
        public void TryParseInt32_Returns_Null_If_Input_Is_Not_Valid()
        {
            const string input = "foo";
            int? result = Numbers.TryParseInt32(input);
            result.Should().Be(null);
        }

        [Test]
        public void TryParseDouble_Returns_Value_If_Input_Is_Valid()
        {
            const string input = "42.123";
            double? result = Numbers.TryParseDouble(input, NumberStyles.Float, CultureInfo.InvariantCulture);
            result.Should().Be(42.123);
        }

        [Test]
        public void TryParseDouble_Returns_Null_If_Input_Is_Not_Valid()
        {
            const string input = "foo";
            double? result = Numbers.TryParseDouble(input, NumberStyles.Float, CultureInfo.InvariantCulture);
            result.Should().BeNull();
        }
    }
}