using Numbers.NumberFactory;

namespace Numbers.Test.NumberFactory;

public sealed class EvenNumbersTests
{
    [Fact]
    public void LowerBound()
    {
        const long LowerBound = 3;
        var numbers = Factory.Create(NumberType.Even, LowerBound, 9);
        
        numbers.LowerBound.Should().Be(LowerBound);
    }

    [Fact]
    public void UpperBound()
    {
        const long UpperBound = 9;
        var numbers = Factory.Create(NumberType.Even, 3, UpperBound);
        
        numbers.UpperBound.Should().Be(UpperBound);
    }

    [Fact]
    public void Count()
    {
        var numbers = Factory.Create(NumberType.Even, 3, 11);
        
        numbers.Length.Should().Be(4, "4, 6, 8, 10");
    }

    [Fact]
    public void FirstIndex()
    {
        var numbers = Factory.Create(NumberType.Even, 3, 9);
        
        numbers[0].Should().Be(4);
    }

    [Fact]
    public void LastIndex()
    {
        var numbers = Factory.Create(NumberType.Even, 3, 9);
        
        numbers[^1].Should().Be(8);
    }

    [Theory]
    [InlineData(NumberType.Even, 3, 9, new long[] { 4, 6, 8 })]
    [InlineData(NumberType.Even, 2, 9, new long[] { 2, 4, 6, 8 })]
    [InlineData(NumberType.Even, 3, 10, new long[] { 4, 6, 8, 10 })]
    public void Content(NumberType type, long lower, long upper, long[] expected)
    {
        var numbers = Factory.Create(type, lower, upper);
        
        for (var i = 0; i < numbers.Length; i++)
        {
            numbers[i].Should().Be(expected[i]);
        }
    }

    [Fact]
    public void ForeachContent()
    {
        int i = -1;
        long[] expected = [4, 6, 8];
        var numbers = Factory.Create(NumberType.Even, 3, 9);
        
        foreach (long item in numbers)
        {
            i++;
            item.Should().Be(expected[i]);
        }
    }
}