using System.Collections.Generic;
using DotnetStandardStreams;

namespace DotnetStandardStreamsTests;

public class AnonOutputTargetTests
{
	[Fact]
	public void CanConstruct()
	{
		_ = new AnonOutputTarget(static _ => { });
	}

	[Fact]
	public void WritesEachLine()
	{
		List<string> expected = ["1", "2", "", "4", "5", "6", "7", "8", "9", "10"];
		List<string> actual = [];
		IOutputTarget target = new AnonOutputTarget(s => actual.Add(s));

		foreach (string s in expected)
			target.Output(s);

		actual.ShouldBe(expected);
	}

	[Fact]
	public void OutputsConditionally()
	{
		List<string> input = ["1", "2", "", "4", "5", "6", "7", "8", "9", "10"];
		List<string> expected = ["2", "4", "6", "8", "10"];
		List<string> actual = [];

		IOutputTarget target = new AnonOutputTarget(s =>
		{
			if (int.TryParse(s, out int i))
				if (i % 2 == 0)
					actual.Add(s);
		});

		foreach (string s in input)
			target.Output(s);

		actual.ShouldBe(expected);
	}
}