jellyfin-multilang/tests/Jellyfin.Plugin.Multilang.Tests/ItemsProxySortingTests.cs

using System.Globalization;
using System.Text.Json.Nodes;
using Jellyfin.Plugin.Multilang.Configuration;
using Jellyfin.Plugin.Multilang.Services;

namespace Jellyfin.Plugin.Multilang.Tests;

public sealed class ItemsProxySortingTests
{
    [Fact]
    public void TranslationOnlyDoesNotRewriteUpstreamPaging()
    {
        var root = JsonNode.Parse("""{"Items":[{"Name":"One"},{"Name":"Two"}],"TotalRecordCount":200,"StartIndex":100}""")!;
        var original = root.ToJsonString();
        ItemsProxySorting.Apply(root, new ItemsProxyControls("", "", "", 0, 0, "", "", false), CultureInfo.InvariantCulture, []);
        Assert.Equal(original, root.ToJsonString());
    }
    [Fact]
    public void GetSortArticlesUsesBuiltInLanguageFallback()
    {
        var articles = ItemsProxySorting.GetSortArticles(new SortArticleCatalog(), [], "sv-FI");

        Assert.Equal(["en", "ett"], articles);
    }

    [Fact]
    public void GetSortArticlesUsesConfiguredLanguageFallback()
    {
        var articles = ItemsProxySorting.GetSortArticles(
            new SortArticleCatalog(),
            [new SortArticleEntry { Language = "en", Articles = "one, two" }],
            "en-CA");

        Assert.Equal(["one", "two"], articles);
    }

    [Fact]
    public void GetSortArticlesPrefersConfiguredExactLanguage()
    {
        var articles = ItemsProxySorting.GetSortArticles(
            new SortArticleCatalog(),
            [
                new SortArticleEntry { Language = "en", Articles = "language" },
                new SortArticleEntry { Language = "en-GB", Articles = "exact" }
            ],
            "en-GB");

        Assert.Equal(["exact"], articles);
    }

    [Fact]
    public void GetSortArticlesIncludesAlwaysIgnoredArticlesFromOtherLanguages()
    {
        var articles = ItemsProxySorting.GetSortArticles(
            new SortArticleCatalog(),
            [
                new SortArticleEntry { Language = "en", Articles = "a, an, the", AlwaysApply = true },
                new SortArticleEntry { Language = "it", Articles = "il, lo, la" }
            ],
            "it");

        Assert.Equal(["a", "an", "the", "il", "lo", "la"], articles);
    }

    [Fact]
    public void GetSortArticlesReturnsNoneWhenArticleIgnoringIsDisabled()
    {
        var articles = ItemsProxySorting.GetSortArticles(
            new SortArticleCatalog(),
            [new SortArticleEntry { Language = "en", Articles = "a, an, the", AlwaysApply = true }],
            "en",
            ignoreArticles: false);

        Assert.Empty(articles);
    }

    [Fact]
    public void ApplySortsByTitleAfterLeadingArticles()
    {
        var root = ItemsRoot("The Matrix", "A Beautiful Mind", "Avatar");

        ItemsProxySorting.Apply(
            root,
            new ItemsProxyControls("SortName", "Ascending", "", 0, 0, "en-US", ""),
            CultureInfo.GetCultureInfo("en-US"),
            ["a", "an", "the"]);

        Assert.Equal(["Avatar", "A Beautiful Mind", "The Matrix"], ItemNames(root));
    }

    [Fact]
    public void ApplyUsesEachTitlesLanguageForArticleRemoval()
    {
        var root = ItemsRoot("La La Land", "La vita e bella", "Terminator", "The Matrix");
        var articles = new Dictionary<string, string[]>(StringComparer.Ordinal)
        {
            ["La La Land"] = [],
            ["La vita e bella"] = ["il", "lo", "la"],
            ["Terminator"] = [],
            ["The Matrix"] = ["a", "an", "the"]
        };

        ItemsProxySorting.Apply(
            root,
            new ItemsProxyControls("SortName", "Ascending", "", 0, 0, "en-US", ""),
            CultureInfo.GetCultureInfo("en-US"),
            item => articles[item["Name"]!.GetValue<string>()]);

        Assert.Equal(["La La Land", "The Matrix", "Terminator", "La vita e bella"], ItemNames(root));
    }

    [Fact]
    public void ApplyStripsApostropheArticles()
    {
        var root = ItemsRoot("L'avventura", "The Matrix");

        ItemsProxySorting.Apply(
            root,
            new ItemsProxyControls("SortName", "Ascending", "", 0, 0, "en-US", ""),
            CultureInfo.GetCultureInfo("en-US"),
            item => item["Name"]!.GetValue<string>() == "L'avventura" ? ["l'"] : ["the"]);

        Assert.Equal(["L'avventura", "The Matrix"], ItemNames(root));
    }

    [Fact]
    public void ApplyPadsNumbersDuringTitleSort()
    {
        var root = ItemsRoot("Movie 10", "Movie 2", "Movie 1");

        ItemsProxySorting.Apply(
            root,
            new ItemsProxyControls("SortName", "Ascending", "", 0, 0, "en-US", ""),
            CultureInfo.GetCultureInfo("en-US"),
            []);

        Assert.Equal(["Movie 1", "Movie 2", "Movie 10"], ItemNames(root));
    }

    [Fact]
    public void ApplyFiltersAndSlicesAfterLocalSort()
    {
        var root = ItemsRoot("The Matrix", "Magnolia", "A Monster Calls", "Avatar");

        ItemsProxySorting.Apply(
            root,
            new ItemsProxyControls("SortName", "Ascending", "M", 1, 1, "en-US", ""),
            CultureInfo.GetCultureInfo("en-US"),
            ["a", "an", "the"]);

        Assert.Equal(["The Matrix"], ItemNames(root));
        Assert.Equal(3, root["TotalRecordCount"]!.GetValue<int>());
        Assert.Equal(1, root["StartIndex"]!.GetValue<int>());
    }

    private static JsonObject ItemsRoot(params string[] names)
    {
        var items = new JsonArray();
        foreach (var name in names)
            items.Add(new JsonObject { ["Name"] = name, ["SortName"] = name });

        return new JsonObject
        {
            ["Items"] = items,
            ["TotalRecordCount"] = names.Length,
            ["StartIndex"] = 0
        };
    }

    private static string[] ItemNames(JsonObject root)
        => root["Items"]!.AsArray()
            .OfType<JsonObject>()
            .Select(item => item["Name"]!.GetValue<string>())
            .ToArray();
}