using ItWorx.KnowledgeHub.Domain.Attachments;

namespace ItWorx.KnowledgeHub.Domain.Tests;

public sealed class SafeFilenameTests
{
    [Theory]
    [InlineData("../../../../etc/passwd", "passwd")]
    [InlineData("..\\..\\windows\\system32\\config", "config")]
    [InlineData("subdir/verslag.pdf", "verslag.pdf")]
    public void Create_strips_any_directory_component_and_keeps_only_the_leaf_name(string raw, string expected)
    {
        var filename = SafeFilename.Create(raw);

        Assert.Equal(expected, filename.Value);
    }

    [Fact]
    public void Create_rejects_a_filename_containing_a_null_byte()
    {
        Assert.Throws<ArgumentException>(() => SafeFilename.Create("bestand\0.txt"));
    }

    [Fact]
    public void Create_rejects_a_filename_containing_a_control_character()
    {
        Assert.Throws<ArgumentException>(() => SafeFilename.Create("bestand.txt"));
    }

    [Fact]
    public void Create_rejects_an_empty_or_dot_only_filename()
    {
        Assert.Throws<ArgumentException>(() => SafeFilename.Create(""));
        Assert.Throws<ArgumentException>(() => SafeFilename.Create("."));
        Assert.Throws<ArgumentException>(() => SafeFilename.Create(".."));
    }

    [Fact]
    public void Create_truncates_an_excessively_long_filename()
    {
        var raw = new string('a', 400) + ".txt";

        var filename = SafeFilename.Create(raw);

        Assert.True(filename.Value.Length <= SafeFilename.MaximumLength);
    }

    [Fact]
    public void AllExtensions_detects_a_double_extension()
    {
        var filename = SafeFilename.Create("factuur.pdf.exe");

        Assert.Equal([".pdf", ".exe"], filename.AllExtensions());
        Assert.Equal(".exe", filename.LastExtension());
    }

    [Fact]
    public void LastExtension_is_null_when_there_is_no_extension()
    {
        var filename = SafeFilename.Create("readme");

        Assert.Null(filename.LastExtension());
    }
}