namespace AuthorBuddy.Web.Models;

[Flags]
public enum FileCategory
{
    None = 0,
    Character = 1,
    Exposee = 2,
    Fact = 4,
    Document = 8
}

public static class FileCategoryHelper
{
    public static bool IsValid(FileCategory value)
    {
        if (value == FileCategory.None) return true;

        // Exposee and Document must be alone
        bool hasExposee = value.HasFlag(FileCategory.Exposee);
        bool hasDocument = value.HasFlag(FileCategory.Document);
        bool hasCharacter = value.HasFlag(FileCategory.Character);
        bool hasFact = value.HasFlag(FileCategory.Fact);

        if (hasExposee && value != FileCategory.Exposee) return false;
        if (hasDocument && value != FileCategory.Document) return false;

        // Charakter + Fakt is the only valid multi-category combination
        if (hasCharacter && hasFact && value == (FileCategory.Character | FileCategory.Fact)) return true;

        // Single categories are valid
        if (value is FileCategory.Character or FileCategory.Fact or FileCategory.Exposee or FileCategory.Document) return true;

        return false;
    }

    public static string DisplayName(FileCategory category) => category switch
    {
        FileCategory.Character => "Charakter",
        FileCategory.Exposee => "Exposé",
        FileCategory.Fact => "Fakt",
        FileCategory.Document => "Dokument",
        FileCategory.Character | FileCategory.Fact => "Charakter + Fakt",
        _ => ""
    };

    public static string DisplayIcon(FileCategory category) => category switch
    {
        FileCategory.Character => "👤",
        FileCategory.Exposee => "📋",
        FileCategory.Fact => "📌",
        FileCategory.Document => "📄",
        FileCategory.Character | FileCategory.Fact => "👤📌",
        _ => ""
    };

    public static string CssClass(FileCategory category) => category switch
    {
        FileCategory.Character => "category-character",
        FileCategory.Exposee => "category-exposee",
        FileCategory.Fact => "category-fact",
        FileCategory.Document => "category-document",
        FileCategory.Character | FileCategory.Fact => "category-character-fact",
        _ => ""
    };
}