private void AddStatInfo(MediaList medialist)
{
foreach (string genre in medialist.Media.Genres)
{
GenreStatInfo cgsi = GenresStatInfo.Find(gsi => gsi.Name == genre);
if (cgsi == null)
{
// Invalid genre.
continue;
}
else
{
cgsi.Count += 1;
cgsi.MinutesWatched += medialist.Media.Duration * medialist.Progress;
}
}
foreach (MediaTag tag in medialist.Media.Tags)
{
TagStatInfo ctsi = TagsStatInfo.Find(tsi => tsi.Name == tag.Name);
if (ctsi == null)
{
// Invalid tag.
continue;
}
else
{
ctsi.Count += 1;
ctsi.MinutesWatched += medialist.Media.Duration * medialist.Progress;
}
}
}
/// <summary>
/// Metric function based on minutes watched between genre and tag.
/// </summary>
/// <param name="g">Genre</param>
/// <param name="t">Tag</param>
/// <remarks>By defining symmetry in the arguments this turns the set of genres and tags in a metric space.</remarks>
/// <returns>The distance between the genre and the tag.</returns>
private int MinutesWatchedMetric(GenreStatInfo g, TagStatInfo t)
{
if (g == null)
{
throw new ArgumentNullException(nameof(g));
}
if (t == null)
{
throw new ArgumentNullException(nameof(t));
}
return(Math.Abs(g.MinutesWatched - t.MinutesWatched) + constNonRelevancy);
}
/// <summary>
/// Metric function based on count between genre and tag.
/// </summary>
/// <param name="g">Genre</param>
/// <param name="t">Tag</param>
/// <remarks>By defining symmetry in the arguments this turns the set of genres and tags in a metric space.</remarks>
/// <returns>The distance between the genre and the tag.</returns>
private int CountMetric(GenreStatInfo g, TagStatInfo t)
{
if (g == null)
{
throw new ArgumentNullException(nameof(g));
}
if (t == null)
{
throw new ArgumentNullException(nameof(t));
}
return(Math.Abs(g.Count - t.Count) + constNonRelevancy);
}
/// <summary>
/// Metric function based on minutes watched for genres.
/// </summary>
/// <param name="g1">Genre 1</param>
/// <param name="g2">Genre 2</param>
/// <returns>The distance between the two genres (in terms of minutes watched).</returns>
private int MinutesWatchedMetric(GenreStatInfo g1, GenreStatInfo g2)
{
if (g1 == null)
{
throw new ArgumentNullException(nameof(g1));
}
if (g2 == null)
{
throw new ArgumentNullException(nameof(g2));
}
if (g1.Name == g2.Name)
{
return(0);
}
return(Math.Abs(g1.MinutesWatched - g2.MinutesWatched) + constNonRelevancy);
}
/// <summary>
/// Metric function based on minutes watched for genres or tags.
/// Determines what each parameter is, either a genre or tag, and applies the correct metric function.
/// </summary>
/// <param name="got1">Genre or Tag 1</param>
/// <param name="got2">Genre or Tag 2</param>
/// <remarks>May throw an InvalidGenreOrTagException.</remarks>
/// <returns>The distance between got1 and got2 (in terms of minutes watched).</returns>
private int MinutesWatchedMetric(string got1, string got2)
{
GenreStatInfo gsi1 = genreAndTagStatInfo.GenresStatInfo.Find(gsi => gsi.Name == got1);
if (gsi1 != null)
{
GenreStatInfo gsi2 = genreAndTagStatInfo.GenresStatInfo.Find(gsi => gsi.Name == got2);
if (gsi2 != null)
{
return(MinutesWatchedMetric(gsi1, gsi2));
}
TagStatInfo tsi2 = genreAndTagStatInfo.TagsStatInfo.Find(tsi => tsi.Name == got2);
if (tsi2 != null)
{
return(MinutesWatchedMetric(gsi1, tsi2));
}
throw new InvalidGenreOrTagException(got2 + " is not a valid genre or tag.");
}
TagStatInfo tsi1 = genreAndTagStatInfo.TagsStatInfo.Find(tsi => tsi.Name == got1);
if (tsi1 != null)
{
GenreStatInfo gsi2 = genreAndTagStatInfo.GenresStatInfo.Find(gsi => gsi.Name == got2);
if (gsi2 != null)
{
return(MinutesWatchedMetric(tsi1, gsi2));
}
TagStatInfo tsi2 = genreAndTagStatInfo.TagsStatInfo.Find(tsi => tsi.Name == got2);
if (tsi2 != null)
{
return(MinutesWatchedMetric(tsi1, tsi2));
}
throw new InvalidGenreOrTagException(got2 + " is not a valid genre or tag.");
}
throw new InvalidGenreOrTagException(got1 + " is not a valid genre or tag.");
}
/// <summary>
/// Symmetry for MinutesWatchedMetric(g, t).
/// </summary>
/// <param name="t">Tag</param>
/// <param name="g">Genre</param>
/// <returns>Distance between g and t (in terms of minutes watched).</returns>
private int MinutesWatchedMetric(TagStatInfo t, GenreStatInfo g)
{
return(MinutesWatchedMetric(g, t));
}
/// <summary>
/// Symmetry for CountMetric(g, t).
/// </summary>
/// <param name="t">Tag</param>
/// <param name="g">Genre</param>
/// <returns>Distance between g and t.</returns>
private int CountMetric(TagStatInfo t, GenreStatInfo g)
{
return(CountMetric(g, t));
}
