using PLib.Domain.Videos;
using Shouldly;

namespace PLib.Tests.Domain;

public sealed class VideoItemTests
{
    private static VideoItem CreateIndexedItem()
    {
        var item = new VideoItem(@"C:\videos\clip.mp4", "clip", 1_000, DateTimeOffset.UnixEpoch);
        item.ApplyTechnicalInfo(new VideoTechnicalInfo(TimeSpan.FromMinutes(3), 1920, 1080, "h264"));
        item.AttachThumbnail(@"C:\cache\clip.jpg");
        item.AttachPreview(@"C:\cache\clip.strip.jpg", 12);
        item.ApplyPerceptualHash(0xDEADBEEF);
        return item;
    }

    [Fact]
    public void An_item_is_indexed_once_it_has_a_duration_and_a_poster_frame()
    {
        var item = new VideoItem(@"C:\videos\clip.mp4", "clip", 1_000, DateTimeOffset.UnixEpoch);
        item.IsIndexed.ShouldBeFalse();

        item.ApplyTechnicalInfo(new VideoTechnicalInfo(TimeSpan.FromMinutes(1), 1280, 720, "h264"));
        item.IsIndexed.ShouldBeFalse();

        item.AttachThumbnail(@"C:\cache\clip.jpg");

        // Neither the animated preview nor the hash is part of this: both belong to later
        // passes, and the grid is usable long before either exists.
        item.IsIndexed.ShouldBeTrue();
        item.NeedsAnimatedPreview.ShouldBeTrue();
        item.NeedsPerceptualHash.ShouldBeTrue();

        item.AttachPreview(@"C:\cache\clip.strip.jpg", 12);
        item.NeedsAnimatedPreview.ShouldBeFalse();

        item.ApplyPerceptualHash(1);
        item.NeedsPerceptualHash.ShouldBeFalse();
    }

    [Fact]
    public void The_later_passes_cannot_be_asked_for_before_the_duration_is_known()
    {
        var item = new VideoItem(@"C:\videos\clip.mp4", "clip", 1_000, DateTimeOffset.UnixEpoch);

        // Both sample frames across the running time, so there is nothing to sample yet.
        item.NeedsAnimatedPreview.ShouldBeFalse();
        item.NeedsPerceptualHash.ShouldBeFalse();
    }

    [Fact]
    public void A_preview_of_a_single_frame_is_not_an_animation()
    {
        var item = new VideoItem(@"C:\videos\clip.mp4", "clip", 1_000, DateTimeOffset.UnixEpoch);

        Should.Throw<ArgumentOutOfRangeException>(() => item.AttachPreview(@"C:\cache\clip.jpg", 1));
    }

    [Fact]
    public void Refreshing_an_unchanged_file_keeps_everything_that_was_derived_from_it()
    {
        var item = CreateIndexedItem();

        item.RefreshFileFacts(1_000, DateTimeOffset.UnixEpoch);

        item.IsIndexed.ShouldBeTrue();
        item.ThumbnailPath.ShouldNotBeNull();
        item.PreviewPath.ShouldNotBeNull();
    }

    [Fact]
    public void Refreshing_a_changed_file_invalidates_the_metadata_and_the_thumbnail()
    {
        var item = CreateIndexedItem();

        item.RefreshFileFacts(2_000, DateTimeOffset.UnixEpoch.AddDays(1));

        item.SizeInBytes.ShouldBe(2_000);
        item.Duration.ShouldBeNull();
        item.ThumbnailPath.ShouldBeNull();
        item.PreviewPath.ShouldBeNull();
        item.PreviewFrameCount.ShouldBe(0);

        // The hash describes the picture, so a different file means a different hash.
        item.PerceptualHash.ShouldBeNull();
        item.IsIndexed.ShouldBeFalse();
    }

    [Theory]
    [InlineData("", "title")]
    [InlineData("   ", "title")]
    [InlineData(@"C:\videos\clip.mp4", "")]
    public void An_item_cannot_be_created_without_a_path_and_a_title(string path, string title) =>
        Should.Throw<ArgumentException>(() => new VideoItem(path, title, 1, DateTimeOffset.UnixEpoch));

    [Fact]
    public void An_item_cannot_have_a_negative_size() =>
        Should.Throw<ArgumentOutOfRangeException>(
            () => new VideoItem(@"C:\videos\clip.mp4", "clip", -1, DateTimeOffset.UnixEpoch));
}