using System;
using System.Collections.Generic;
using System.Text;
using VEPROMS.CSLA.Library;
using System.Windows.Forms;

namespace Volian.Controls.Library
{
	public delegate void MostRecentItemEvent();

	public class MostRecentItemList : List<MostRecentItem>
	{
		public event ItemInfoEvent AfterRemove;
		internal void OnAfterRemove(object sender)
		{
		    if (AfterRemove != null) AfterRemove(sender);
		}
		private int _MaxItems = 10;
		public int MaxItems
		{
			get { return _MaxItems; }
			set { _MaxItems = value; }
		}
		public new MostRecentItem Add(MostRecentItem myMRI)
		{
			Refresh();
			MostRecentItem tmp = null;
			// Look for the ItemID
			foreach (MostRecentItem mri in this)
				if (mri.ItemID == myMRI.ItemID)
					tmp = mri;
			// If it exists - remove it
			if (tmp != null)
			{
				tmp.MyItemInfo.BeforeDelete -= new ItemInfoEvent(MyItemInfo_BeforeDelete);
				Remove(tmp);
			}
			// Insert it in the first place in the list
			Insert(0, myMRI);
			// If more than MaxItems exist remove the items beyond MaxItems 
			if (MaxItems > 0)
				while (Count > MaxItems) RemoveAt(MaxItems);
			myMRI.MyItemInfo.BeforeDelete += new ItemInfoEvent(MyItemInfo_BeforeDelete);
			return myMRI;
		}
		public void Refresh()
		{
			foreach (MostRecentItem mri in this)
				mri.Refresh();
		}

		// delete the item from the most recently used list.  This event gets handled
		// when a delete item occurs.
		void MyItemInfo_BeforeDelete(object sender)
		{
			ItemInfo ii = sender as ItemInfo;
			if (ii != null)
			{
				MostRecentItem tmp = null;
				// Look for the ItemID
				foreach (MostRecentItem mri in this)
					if (mri.ItemID == ii.ItemID)
						tmp = mri;
				// If it exists - remove it
				if (tmp != null)
					Remove(tmp);
				OnAfterRemove(null);
			}
		}
		public MostRecentItem Add(int itemID)
		{
			ItemInfo tmp = ItemInfo.Get(itemID);
			if (tmp == null)
			{
				MessageBox.Show("This step no longer exists", "Invalid Most Recent Item", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
				return null;
			}
			return Add(new MostRecentItem(tmp));
		}
		public MostRecentItem Add(ItemInfo myItem)
		{
			return Add(new MostRecentItem(myItem));
		}
		public MostRecentItem Add(string s)
		{
			MostRecentItem mri = MostRecentItem.ParseString(s);
			if(mri != null)
			 Add(mri);
		 return mri;
		}
		public MostRecentItem Add(IVEDrillDownReadOnly myDrillDown)
		{
			if (typeof(ItemInfo).IsAssignableFrom(myDrillDown.GetType()))
				return Add(new MostRecentItem((ItemInfo)myDrillDown));
			return null;
		}
		public static MostRecentItemList GetMRILst(System.Collections.Specialized.StringCollection list)
		{
			return GetMRILst(list, 10);
		}

		public static MostRecentItemList GetMRILst(System.Collections.Specialized.StringCollection list, int maxItems)
		{
			MostRecentItemList mril = new MostRecentItemList();
			mril.MaxItems = maxItems;
			if (list != null)
				for (int i = list.Count - 1; i >= 0;i-- )// Add in reverse order so first is last and last is first
					mril.Add(list[i]);
			return mril;
		}
		public System.Collections.Specialized.StringCollection ToSettings()
		{
			if (Count == 0) return null;
			Refresh();
			System.Collections.Specialized.StringCollection retval = new System.Collections.Specialized.StringCollection();
			foreach (MostRecentItem mri in this)
				retval.Add(mri.ToString());
			return retval;
		}
	} // Class
	public class MostRecentItem
	{
		[NonSerialized]
		private ItemInfo _MyItemInfo;
		public ItemInfo MyItemInfo
		{
			get
			{
				if (_MyItemInfo == null)
					_MyItemInfo = ItemInfo.Get(_ItemID);
				return _MyItemInfo;
			}
			set
			{
				_ItemID = value.ItemID;
				_MyItemInfo = value;
				_MenuTitle = GetMenuTitle();
				_ToolTip = GetToolTip(_MyItemInfo);
			}
		}
		internal void Refresh()
		{
			MyItemInfo = MyItemInfo;
		}
		private int _ItemID;
		public int ItemID
		{
			get { return _ItemID; }
			set { _ItemID = value; }
		}
		private string _MenuTitle;
		public string MenuTitle
		{
			get
			{
				if (_MenuTitle == null)
					_MenuTitle = GetMenuTitle();
				return _MenuTitle;
			}
			set { _MenuTitle = value; }
		}
		private string GetMenuTitle()
		{
			return MyItemInfo.Path;
		}
		private string _ToolTip;
		public string ToolTip
		{
			get
			{
				if (_ToolTip == null)
					_ToolTip = GetToolTip(MyItemInfo);
				return _ToolTip;
			}
			set { _ToolTip = value; }
		}
		private static string GetToolTip(ItemInfo item)
		{
			// reset active parent if null 
			// if (MyItemInfo.MyProcedure.ActiveParent == null) MyItemInfo.MyProcedure.ActiveParent = null;
			DocVersionInfo tmp = (DocVersionInfo)(item.MyProcedure.ActiveParent);
			StringBuilder sb = new StringBuilder();
			int indent = BuildPath(tmp.MyFolder, ref sb);
			return sb.ToString();
		}
		private static int BuildPath(FolderInfo folderInfo, ref StringBuilder sb)
		{
			if (folderInfo.MyParent == null) return 0;
			int indent = BuildPath(folderInfo.MyParent, ref sb);
			sb.Append(string.Format("{0}{1}\n", "".PadLeft(indent * 2), folderInfo.Name));
			return indent;
		}
		public override string ToString()
		{
			return string.Format("{0}~{1}~{2}", _ItemID, MenuTitle, ToolTip);
		}
		private static ItemInfo GetCorrectItemInfoType(int itemId)
		{
			using (ItemInfo itm = ItemInfo.Get(itemId))
			{
				if (itm == null) return null;
				if (itm.IsProcedure) return ProcedureInfo.Get(itemId);
				if (itm.IsSection) return SectionInfo.Get(itemId);
				if (itm.IsStep) return StepInfo.Get(itemId);
			}
			return ItemInfo.Get(itemId);
		}
		public static MostRecentItem ParseString(string str)
		{
			string[] parts = str.Split("~".ToCharArray());
			int itemID = int.Parse(parts[0]);
			ItemInfo item = GetCorrectItemInfoType(itemID);
			if (item == null) return null;
			if (parts.Length > 1 && parts[1] != item.Path && !RetainBadMRIs())
				return null; // Path doesn't match
			if (parts.Length > 2 && parts[2] != GetToolTip(item) && !RetainBadMRIs())
				return null;// Tooltip doesn't match
			//Console.WriteLine("{0},'{1}'", parts[0], parts[1]);
			return new MostRecentItem(item);
		}
		private static int _RetainBadMRIs = 0;
		private static bool RetainBadMRIs()
		{
			if (_RetainBadMRIs == 0)
			{
				System.Windows.Forms.DialogResult result = System.Windows.Forms.MessageBox.Show("Do you want to retain old Recently Used Entries?", "Retain Recent Locations", System.Windows.Forms.MessageBoxButtons.YesNo, System.Windows.Forms.MessageBoxIcon.Question);
				_RetainBadMRIs = result == System.Windows.Forms.DialogResult.Yes ? 2 : 1;
			}
			return _RetainBadMRIs == 2;
		}
		public MostRecentItem(ItemInfo myItem)
		{
			MyItemInfo = myItem;
		}
	}
}