using System.Collections.Generic;

namespace ZXLT.FileSystem
{
    public sealed class DirectoryInfo : FileSystemInfo
    {
        List<DirectoryInfo> directories = new List<DirectoryInfo>();
        List<FileInfo> files = new List<FileInfo>();

        public override bool Exists { get; }
        public override string Name => _name;

        public DirectoryInfo Parent
        {
            get
            {
                var directoryInfo = new DirectoryInfo(System.IO.Path.GetDirectoryName(FullPath));
                return directoryInfo;
            }
        }

        public DirectoryInfo Root => new DirectoryInfo(System.IO.Path.GetPathRoot(this.FullPath));

        public DirectoryInfo(string path)
        {
            this.Init(path, System.IO.Path.GetFullPath(path), isNormalized: true);
            FullPath = path;
            _name = path;
        }

        private void Init(string originalPath, string fullPath = null, string fileName = null, bool isNormalized = false)
        {
            if (fullPath == null)
                fullPath = originalPath;
            fullPath = isNormalized ? fullPath : System.IO.Path.GetFullPath(fullPath);
            this._name = fileName;
            this.FullPath = fullPath;
        }

        public DirectoryInfo[] GetDirectories()
        {
            return directories.ToArray();
        }

        public FileInfo[] GetFiles()
        {
            return files.ToArray();
        }
    }
}