using PLib.Domain.Videos;
using Shouldly;

namespace PLib.Tests.Domain;

public sealed class WatchProgressTests
{
    private static VideoItem CreateHourLongVideo()
    {
        var item = new VideoItem(@"C:\videos\film.mp4", "film", 1_000, DateTimeOffset.UnixEpoch);
        item.ApplyTechnicalInfo(new VideoTechnicalInfo(TimeSpan.FromHours(1), 1920, 1080, "h264"));
        return item;
    }

    [Fact]
    public void A_position_worth_returning_to_is_remembered()
    {
        var item = CreateHourLongVideo();

        item.RememberProgress(TimeSpan.FromMinutes(20));

        item.ResumePosition.ShouldBe(TimeSpan.FromMinutes(20));
        item.WatchedFraction.ShouldBe(1.0 / 3, 0.01);
        item.PlayCount.ShouldBe(0);
        item.LastPlayedAt.ShouldNotBeNull();
    }

    [Fact]
    public void Stopping_in_the_first_seconds_leaves_nothing_to_resume()
    {
        var item = CreateHourLongVideo();

        item.RememberProgress(TimeSpan.FromSeconds(5));

        item.ResumePosition.ShouldBeNull();
        item.PlayCount.ShouldBe(0);

        // It still counts as opened, which is what recently-played ordering uses.
        item.LastPlayedAt.ShouldNotBeNull();
    }

    [Fact]
    public void Reaching_the_credits_counts_as_watched_rather_than_as_a_resume_point()
    {
        var item = CreateHourLongVideo();

        // Inside the end-of-playback slack: the viewer is done, not paused.
        item.RememberProgress(TimeSpan.FromMinutes(60) - TimeSpan.FromSeconds(5));

        item.ResumePosition.ShouldBeNull();
        item.PlayCount.ShouldBe(1);
        item.WatchedFraction.ShouldBe(0);
    }

    [Fact]
    public void Watching_again_after_finishing_starts_a_fresh_resume_point()
    {
        var item = CreateHourLongVideo();
        item.RememberProgress(TimeSpan.FromMinutes(60));
        item.RememberProgress(TimeSpan.FromMinutes(3));

        item.PlayCount.ShouldBe(1);
        item.ResumePosition.ShouldBe(TimeSpan.FromMinutes(3));
    }

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

        item.RememberProgress(TimeSpan.FromMinutes(5));

        item.ResumePosition.ShouldBe(TimeSpan.FromMinutes(5));

        // Without a duration there is no fraction to draw.
        item.WatchedFraction.ShouldBe(0);
    }
}