namespace HellionChat.Ui;

// Pure string resolver logic with no Dalamud dependency, kept in its own
// file so tests (HellionChat.Tests, no Dalamud reference) can call it directly.
// Used in the settings UI glyph picker and indirectly via TabIconMapping.Resolve.
internal static class TabIconGlyphResolver
{
    // Single source of truth for the glyph set; order matches the settings combobox.
    public static readonly IReadOnlyList<string> PickerOptions =
    [
        "comment",
        "comments",
        "cog",
        "users",
        "user-friends",
        "link",
        "envelope",
        "clock",
        "hashtag",
        "star",
        "heart",
        "bell",
        "bookmark",
        "flag",
        "fire",
    ];

    // Derived from PickerOptions -- never maintain this manually.
    private static readonly HashSet<string> KnownGlyphs = new(
        PickerOptions,
        StringComparer.OrdinalIgnoreCase
    );

    // Tab.Name is localised, so we match against a pool of DE/EN synonyms.
    private static readonly Dictionary<string, string> NameDefaults = new(
        StringComparer.OrdinalIgnoreCase
    )
    {
        ["allgemein"] = "comment",
        ["general"] = "comment",
        ["system"] = "cog",
        ["free company"] = "users",
        ["fc"] = "users",
        ["gruppe"] = "user-friends",
        ["group"] = "user-friends",
        ["party"] = "user-friends",
        ["linkshell"] = "link",
        ["ls"] = "link",
        ["cwls"] = "link",
        ["tells"] = "envelope",
        ["tell"] = "envelope",
    };

    // Resolves the glyph name for a tab. Priority order:
    // 1. Tab.Icon override (if set): known glyph -> use it, unknown -> "hashtag"
    // 2. Auto-tell tab -> autoTellGlyph if provided, else "clock"
    // 3. Name default lookup
    // 4. Fallback "hashtag"
    public static string ResolveGlyphName(Tab tab, string? autoTellGlyph = null)
    {
        if (!string.IsNullOrWhiteSpace(tab.Icon))
            return KnownGlyphs.Contains(tab.Icon) ? tab.Icon : "hashtag";

        if (tab.IsTempTab)
            return autoTellGlyph ?? "clock";

        if (tab.Name is { } name && NameDefaults.TryGetValue(name, out var byName))
            return byName;

        return "hashtag";
    }
}