///
/// Copyright (c) 2013-2015 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using Config.Entities;

namespace TBF.UiControls
{
	public class BaseWithListViewEx<MyItem> : Results.Forms.ListViewEx
	{
		/// <summary>
		/// List of items to be edited
		/// </summary>
		public IList<MyItem> MyItems;

		/// <summary>
		/// Number of items/rows with lowest ItemNr = 0,... 
		/// that cannot be deleted, moved down, renamed, etc.
		/// </summary>
		public int FixedRowsCount;

		/// <summary>
		/// List of removed items that have to be removed  from the database
		/// when completed with OK.
		/// </summary>
		public IList<MyItem> ToBeRemovedItems;
 
		/// <summary>
		/// true = editing was unlocked
		/// </summary>
		public bool Unlocked { get { return unlocked; } }	/// read only
		bool unlocked;

		public BaseWithListViewEx()
			: base()
		{
			ToBeRemovedItems = new List<MyItem>();

			/// Initialize the base (ListViewEx)
 			this.SuspendLayout();
			AllowColumnReorder = false;
			Dock = System.Windows.Forms.DockStyle.Fill;
			DoubleClickActivation = false;
			FullRowSelect = true;
			GridLines = true;
			Location = new System.Drawing.Point(0, 0);
			Name = "baseWithListViewEx";
			Size = new System.Drawing.Size(150, 150);
			TabIndex = 0;
			UseCompatibleStateImageBehavior = false;
			View = System.Windows.Forms.View.Details;
			ResumeLayout(false);
		}

		public void Unlock()
		{
			unlocked = true;

			if (base.SelectedItems.Count == 1)
			{
				int ix = SelectedIndices[0];
				Focus();
				Items[ix].Selected = true;
				Items[ix].EnsureVisible();
			}
		}

		protected void RedrawAll()
		{
			Items.Clear();
			foreach (var myItem in MyItems) DrawOne(myItem);
		}

		public virtual void DrawOne(object myItem)
		{
		}

		void UpdateAll()
		{
			if (MyItems == null || (MyItems.Count != Items.Count)) return;

			foreach (ListViewItem lvi in Items)
			{
				UpdateOne(lvi, (MyItem)lvi.Tag);
			}
		}

		public virtual void UpdateOne(ListViewItem lvi, object myItem)
		{
		}

		public void OkBtnClicked()
		{
			UpdateAll();
		}

		public void CancelBtnClicked()
		{
		}

		public void AddOne(MyItem myItem)
		{
			MyItems.Add(myItem);
			DrawOne(myItem);

			Focus();
			SelectedItems.Clear();
			Items[Items.Count - 1].Selected = true;
			Items[Items.Count - 1].EnsureVisible();
		}

		/// <summary>
		/// Called when 'Remove' button was clicked.
		/// </summary>
		/// <returns>true when the last item was removed and 'Remove' button should be disabled</returns>
		public bool RemoveSelected()
		{
			if (SelectedItems.Count != 1) return false;

			UpdateAll();

			int removeItemNr = SelectedIndices[0];
			if (removeItemNr < FixedRowsCount) return false;

			MyItem selectedItem = (MyItem)SelectedItems[0].Tag;

            if (selectedItem is IHasItemNr && (selectedItem as IHasItemNr).Id != 0)
            {
                ToBeRemovedItems.Add(selectedItem);
            }
			MyItems.RemoveAt(removeItemNr);
			if (selectedItem is IHasItemNr)
			{
				for (int i = removeItemNr; i < MyItems.Count; i++)
				{
					(MyItems[i] as IHasItemNr).ItemNr--;
				}
			}

			RedrawAll();

			if (removeItemNr < base.Items.Count)
			{
				Focus();
				Items[removeItemNr].Selected = true;
				Items[removeItemNr].EnsureVisible();
				return false;
			}
			else
			{
				return true;
			}
		}

		public void MoveUpSelected()
		{
			if (SelectedItems.Count != 1) return;

			int ix = base.SelectedIndices[0];
			if (ix <= FixedRowsCount || ix >= MyItems.Count) return;

			UpdateAll();

			MyItem item1 = (MyItem)(Items[ix - 1].Tag);
			MyItem item2 = (MyItem)(Items[ix].Tag);
			(item1 as IHasItemNr).ItemNr++;
			(item2 as IHasItemNr).ItemNr--;
			MyItems.RemoveAt(ix);
			MyItems.Insert(ix - 1, item2);

			RedrawAll();

			Focus();
			Items[ix - 1].Selected = true;
			Items[ix - 1].EnsureVisible();
		}

		public void MoveDownSelected()
		{
			if (base.SelectedItems.Count != 1) return;

			int ix = base.SelectedIndices[0];
			if (ix < FixedRowsCount || ix >= MyItems.Count - 1) return;

			UpdateAll();

			MyItem item1 = (MyItem)(Items[ix].Tag);
			MyItem item2 = (MyItem)(Items[ix + 1].Tag);
			(item1 as IHasItemNr).ItemNr++;
			(item2 as IHasItemNr).ItemNr--;
			MyItems.RemoveAt(ix + 1);
			MyItems.Insert(ix, item2);

			RedrawAll();

			Focus();
			Items[ix + 1].Selected = true;
			Items[ix + 1].EnsureVisible();
		}


		public IList<string> GetUsedNames()
		{
			IList<string> usedNames = new List<string>();

			if (MyItems != null)
			{
				foreach (var item in MyItems) if (item is IHasName) usedNames.Add((item as IHasName).Name);
			}
			
			return usedNames;
		}
	}
}