using System.Reflection;
using PkmnLib.Static.Utils;

namespace PkmnLib.Dynamic.ScriptHandling.Registry;

/// <summary>
/// Extension methods for scripts.
/// </summary>
public static class ScriptUtils
{
    private static readonly Dictionary<Type, StringKey> NameCache = new();
    
    /// <summary>
    /// Resolve name from the <see cref="ScriptAttribute"/> of the given script.
    /// </summary>
    public static StringKey ResolveName(this Script script) => ResolveName(script.GetType());
    
    /// <summary>
    /// Resolve name from the <see cref="ScriptAttribute"/> of the given type.
    /// </summary>
    public static StringKey ResolveName(Type type)
    {
        if (NameCache.TryGetValue(type, out var name))
            return name;

        var scriptAttr = type.GetCustomAttribute<ScriptAttribute>();
        if (scriptAttr == null)
            throw new InvalidOperationException($"Type {type} does not have a {nameof(ScriptAttribute)}.");
        return NameCache[type] = scriptAttr.Name;
    }
}