// Copyright (C) 2025, The Duplicati Team
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// 
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// Software is furnished to do so, subject to the following conditions:
// 
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using System;
using System.Collections.Generic;
using Duplicati.Library.Interface;
using Duplicati.Library.Modules.Builtin;

namespace Duplicati.Library.DynamicLoader
{
    /// <summary>
    /// An interface class that provides easy loading of pluggable setting controls
    /// </summary>
    public static class GenericLoader
    {
        /// <summary>
        /// Implementation overrides specific to generic module use
        /// </summary>
        private class GenericLoaderSub : DynamicLoader<IGenericModule>
        {
            /// <summary>
            /// Returns the filename extension, which is also the key
            /// </summary>
            /// <param name="item">The item to load the key for</param>
            /// <returns>The file extension used by the module</returns>
            protected override string GetInterfaceKey(IGenericModule item)
                => item.Key;

            /// <summary>
            /// Returns the subfolders searched for generic modules
            /// </summary>
            protected override string[] Subfolders
                => ["modules"];

            /// <summary>
            /// The built-in modules
            /// </summary>
            protected override IEnumerable<IGenericModule> BuiltInModules
                => GenericModules.BuiltInGenericModules;
        }

        #region Public static API

        /// <summary>
        /// The loader instance used to query the modules
        /// </summary>
        private static readonly Lazy<GenericLoaderSub> _loader = new(() => new GenericLoaderSub());
        /// <summary>
        /// Gets a list of loaded settings controls, the instances can be used to extract interface information, not used to interact with the module.
        /// </summary>
        public static IGenericModule[] Modules => _loader.Value.Interfaces;

        /// <summary>
        /// Gets a list of keys supported
        /// </summary>
        public static string[] Keys => _loader.Value.Keys;

        #endregion

    }
}