using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Intel.Management.PSModule
{
    class ChildWriter
    {
        List<DriveItem> _list;
       // bool _cachResults;
        DriveProvider _provider;
        DriveContainer _parent;
        string _path;
        bool _recurse;

         
        public ChildWriter(DriveContainer parent, string path, bool recurse,DriveProvider provider)
        {
            _list = new List<DriveItem>();
            //_cachResults = true;
            _provider = provider;
            _parent = parent;
            _path = path;
            _recurse = recurse;
        }

        public ChildWriter()
        {
            //_cachResults = true;
        }

        public void SetParent(DriveContainer newParent)
        {
            if (_path !=null || ( newParent != null && _parent != null))
                throw new InvalidOperationException();

            _parent = newParent;
            if (_parent == null)
            {
                _list.Clear();
                _list = null;
                _path = null;
                //_cachResults = true;
                _recurse = false;

            }
            else
            {
                _list = new List<DriveItem>();
            }
        }

        public void Add(DriveItem[] items)
        {
            _list.AddRange(items);
        }

        public void Add(DriveItem item)
        {
            _list.Add(item);
        }

        public DriveItem FindItem(string name)
        {
            foreach (DriveItem item in _list)
            {
                if (string.Compare(item.Name, name) == 0)
                    return item;
            }
            return null;
        }

        public DriveProvider Provider
        {
            get 
            {
                return _provider; 
            }
            set
            {
                _provider = value;
            }
        }

       /* public bool CacheResults
        {
            get { return _cachResults; }
            set { _cachResults = value; }
        }*/

        public DriveItem[] Children
        {
            get { return _list.ToArray(); }
        }

        public void Flush()
        {
            WriteChildren(_parent, _path);
            _list.Clear();
        }

        public bool Force
        {
            get
            {
                if (_provider != null)
                    return _provider.Force.IsPresent;
                return false;
            }
        }

        private void WriteChildren(DriveContainer parent, string parentPath)
        {
            DriveItem[] items = items=parent.GetChildItems();

            if (items == null || Force ) //items have not been retrieved
            {
                if (_list.Count==0)
                    parent.GetChildItems(this); // get items into the writer
                items = _list.ToArray();
                _list.Clear();
                 parent.SetChildItems(items);
            }

            if (parentPath != null)
            {
                foreach (DriveItem item in items)
                {
                    WriteItem(item, parentPath + "\\" + item.Name);
                }
            }

        }

        private void WriteItem(DriveItem item,string childPath)
        {
            if (_path != null)
            {
                _provider.WriteItemObject(item.GetReturnObject(),childPath, item is DriveContainer);
            }

            if (item is DriveContainer && _recurse)
            {
                WriteChildren((DriveContainer)item, childPath);
            }
        }
    }//End ChildWriter

}//End Namespace