using System.Diagnostics;
using Godot;
using TBL.GodotSharp.Content.Package;
using Zio.FileSystems;

namespace TBL.GodotSharp.Content
{
    /// <summary>
    /// 内容包容器
    /// </summary>
    public class PackageContainer : Node
    {
        /// <summary>
        /// 叠加文件系统
        /// </summary>
        public readonly AggregateFileSystem FileSystem = new AggregateFileSystem();

        public override void _Ready()
        {
            Name = nameof(PackageContainer);
        }

        /// <summary>
        /// 卸载所有内容包
        /// </summary>
        public void UnloadPackages()
        {
            for (var i = GetChildCount() - 1; i >= 0; i--) 
            {
                if (GetChild(i) is PackageNode packageNode)
                {
                    RemoveChild(packageNode);
                    packageNode.QueueFree();
                }
            }
        }

        /// <summary>
        /// 重装载所有内容包，将内部目录全部以内部内容包加载
        /// </summary>
        public void ReloadPackages() => ReloadPackages(string.Empty);

        /// <summary>
        /// 指定内部内容包目录，重装载所有内容包
        /// </summary>
        /// <param name="internalPackageRoot">内部内容包根目录，传入 null 可以不装载内部内容包</param>
        public void ReloadPackages(string internalPackageRoot)
        {
            UnloadPackages();
            // 添加内部内容包
            if (internalPackageRoot != null)
            {
                var title = ProjectSettings.GetSetting("application/config/name") as string;
                var assembly = Game.Instance.GetType().Assembly;
                var versionInfo = FileVersionInfo.GetVersionInfo(assembly.Location);
                AddChild(new InternalPackage(new PackageNode.Info(title, versionInfo.CompanyName, versionInfo.ProductVersion), internalPackageRoot));
            }
        }
    }
}