using AvParser.Infrastructure.Media;

namespace AvParser.Infrastructure.Tests.Media;

public class ShowcaseNameTests
{
    private const string Hash = "a3f19b7c5d2e8f0142536475869708192a3b4c5d6e7f8091a2b3c4d5e6f70819";

    [Fact]
    public void A_plain_name_is_kept()
    {
        ShowcaseLinker.SanitiseName("kitten", Hash).ShouldBe("kitten");
    }

    [Fact]
    public void An_absent_name_falls_back_to_the_hash()
    {
        ShowcaseLinker.SanitiseName(null, Hash).ShouldBe(Hash[..12]);
        ShowcaseLinker.SanitiseName("   ", Hash).ShouldBe(Hash[..12]);
    }

    [Theory]
    [InlineData("../../etc/passwd")]
    [InlineData("..\\..\\windows\\system32\\config")]
    [InlineData("/absolute/path/name")]
    public void A_name_cannot_walk_out_of_its_directory(string suggested)
    {
        // The suggestion comes from a remote server, so it is treated as hostile rather than
        // merely untidy: only the last segment survives, and separators never do.
        var name = ShowcaseLinker.SanitiseName(suggested, Hash);

        name.ShouldNotContain("/");
        name.ShouldNotContain("\\");
        name.ShouldNotContain("..");
    }

    [Fact]
    public void The_extension_the_origin_suggested_is_dropped()
    {
        // The extension is derived from the sniffed kind, never from what the origin claimed.
        ShowcaseLinker.SanitiseName("photo.exe", Hash).ShouldBe("photo");
    }

    [Theory]
    [InlineData("CON")]
    [InlineData("nul")]
    [InlineData("COM1")]
    [InlineData("lpt9")]
    public void Windows_device_names_are_pushed_out_of_the_way(string reserved)
    {
        ShowcaseLinker.SanitiseName(reserved, Hash).ShouldBe($"_{reserved}");
    }

    [Fact]
    public void An_over_long_name_is_trimmed()
    {
        var name = ShowcaseLinker.SanitiseName(new string('x', 400), Hash);

        name.Length.ShouldBeLessThanOrEqualTo(80);
    }

    [Fact]
    public void A_name_of_nothing_but_junk_falls_back_to_the_hash()
    {
        // Dots rather than, say, '?': the set of invalid filename characters differs by platform,
        // but a name that trims away to nothing does so everywhere.
        ShowcaseLinker.SanitiseName("...", Hash).ShouldBe(Hash[..12]);
        ShowcaseLinker.SanitiseName("\t\t", Hash).ShouldBe(Hash[..12]);
    }

    [Fact]
    public void Control_characters_are_replaced_but_spaces_survive()
    {
        ShowcaseLinker.SanitiseName("a b\tc", Hash).ShouldBe("a b_c");
    }
}