using System.Collections;
using System.Collections.Generic;
using System.Drawing;

namespace Cyotek.Windows.Forms.Demo
{
	// Cyotek ImageBox
	// Copyright (c) 2010-2015 Cyotek Ltd.
	// http://cyotek.com
	// http://cyotek.com/blog/tag/imagebox

	// Licensed under the MIT License. See license.txt for the full text.

	// If you use this control in your applications, attribution, donations or contributions are welcome.

	internal sealed class DragHandleCollection : IEnumerable<DragHandle>
	{
		#region Instance Fields

		private readonly IDictionary<DragHandleAnchor, DragHandle> _items;

		#endregion

		#region Public Constructors

		public DragHandleCollection() {
			_items = new Dictionary<DragHandleAnchor, DragHandle> {
				{ DragHandleAnchor.TopLeft, new DragHandle(DragHandleAnchor.TopLeft) },
				{ DragHandleAnchor.TopCenter, new DragHandle(DragHandleAnchor.TopCenter) },
				{ DragHandleAnchor.TopRight, new DragHandle(DragHandleAnchor.TopRight) },
				{ DragHandleAnchor.MiddleLeft, new DragHandle(DragHandleAnchor.MiddleLeft) },
				{ DragHandleAnchor.MiddleRight, new DragHandle(DragHandleAnchor.MiddleRight) },
				{ DragHandleAnchor.BottomLeft, new DragHandle(DragHandleAnchor.BottomLeft) },
				{ DragHandleAnchor.BottomCenter, new DragHandle(DragHandleAnchor.BottomCenter) },
				{ DragHandleAnchor.BottomRight, new DragHandle(DragHandleAnchor.BottomRight) }
			};
		}

		#endregion

		#region Public Properties

		public int Count => _items.Count;

		public DragHandle this[DragHandleAnchor index] => _items[index];

		#endregion

		#region Public Members

		/// <summary>
		/// Returns an enumerator that iterates through the collection.
		/// </summary>
		/// <returns>
		/// A <see cref="T:System.Collections.Generic.IEnumerator`1"/> that can be used to iterate through the collection.
		/// </returns>
		public IEnumerator<DragHandle> GetEnumerator() {
			return _items.Values.GetEnumerator();
		}

		public DragHandleAnchor HitTest(Point point) {
			DragHandleAnchor result;

			result = DragHandleAnchor.None;

			foreach (DragHandle handle in this) {
				if (handle.Visible && handle.Bounds.Contains(point)) {
					result = handle.Anchor;
					break;
				}
			}

			return result;
		}

		#endregion

		#region IEnumerable<DragHandle> Members

		/// <summary>
		/// Returns an enumerator that iterates through a collection.
		/// </summary>
		/// <returns>
		/// An <see cref="T:System.Collections.IEnumerator"/> object that can be used to iterate through the collection.
		/// </returns>
		IEnumerator IEnumerable.GetEnumerator() {
			return GetEnumerator();
		}

		#endregion
	}
}