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using System;
using System.Collections.Generic;
using System.Linq;
using MediaBrowser.Model.Providers;
namespace MediaBrowser.Model.Extensions
{
/// <summary>
/// Extension methods for <see cref="IEnumerable{T}"/>.
/// </summary>
public static class EnumerableExtensions
{
/// <summary>
/// Orders <see cref="RemoteImageInfo"/> by requested language in descending order, prioritizing "en" over other non-matches.
/// </summary>
/// <param name="remoteImageInfos">The remote image infos.</param>
/// <param name="requestedLanguage">The requested language for the images.</param>
/// <returns>The ordered remote image infos.</returns>
public static IEnumerable<RemoteImageInfo> OrderByLanguageDescending(this IEnumerable<RemoteImageInfo> remoteImageInfos, string requestedLanguage)
{
if (string.IsNullOrWhiteSpace(requestedLanguage))
{
// Default to English if no requested language is specified.
requestedLanguage = "en";
}
return remoteImageInfos.OrderByDescending(i =>
{
// Image priority ordering:
// - Images that match the requested language
// - Images with no language
// - TODO: Images that match the original language
// - Images in English
// - Images that don't match the requested language
if (string.Equals(requestedLanguage, i.Language, StringComparison.OrdinalIgnoreCase))
{
return 4;
}
if (string.IsNullOrEmpty(i.Language))
{
return 3;
}
if (string.Equals(i.Language, "en", StringComparison.OrdinalIgnoreCase))
{
return 2;
}
return 0;
})
.ThenByDescending(i => i.CommunityRating ?? 0)
.ThenByDescending(i => i.VoteCount ?? 0);
}
}
}
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