/// Copyright (c) Microsoft Corporation.  All rights reserved.

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;

namespace Microsoft.VisualStudio.Project.Automation
{
	/// <summary>
	/// This can navigate a collection object only (partial implementation of ProjectItems interface)
	/// </summary>
	[SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix")]
	[ComVisible(true), CLSCompliant(false)]
	public class OANavigableProjectItems : EnvDTE.ProjectItems
	{
		#region fields
		private OAProject project;
		private IList<EnvDTE.ProjectItem> items;
		private HierarchyNode nodeWithItems;
		#endregion

		#region properties
		/// <summary>
		/// Defines an internal list of project items
		/// </summary>
		internal IList<EnvDTE.ProjectItem> Items
		{
			get
			{
				return this.items;
			}
		}

		/// <summary>
		/// Defines a relationship to the associated project.
		/// </summary>
		internal OAProject Project
		{
			get
			{
				return this.project;
			}
		}

		/// <summary>
		/// Defines the node that contains the items
		/// </summary>
		internal HierarchyNode NodeWithItems
		{
			get
			{
				return this.nodeWithItems;
			}
		}
		#endregion

		#region ctor
		/// <summary>
		/// Constructor.
		/// </summary>
		/// <param name="project">The associated project.</param>
		/// <param name="nodeWithItems">The node that defines the items.</param>
		public OANavigableProjectItems(OAProject project, HierarchyNode nodeWithItems)
		{
			this.project = project;
			this.nodeWithItems = nodeWithItems;
			this.items = this.GetListOfProjectItems();
		}

		/// <summary>
		/// Constructor.
		/// </summary>
		/// <param name="project">The associated project.</param>
		/// <param name="items">A list of items that will make up the items defined by this object.</param>
		/// <param name="nodeWithItems">The node that defines the items.</param>
		public OANavigableProjectItems(OAProject project, IList<EnvDTE.ProjectItem> items, HierarchyNode nodeWithItems)
		{
			this.items = items;
			this.project = project;
			this.nodeWithItems = nodeWithItems;
		}
		#endregion

		#region EnvDTE.ProjectItems

		/// <summary>
		/// Gets a value indicating the number of objects in the collection.
		/// </summary>
		public virtual int Count
		{
			get
			{
				return items.Count;
			}
		}

		/// <summary>
		/// Gets the immediate parent object of a ProjectItems collection.
		/// </summary>
		public virtual object Parent
		{
			get
			{
				return this.nodeWithItems.GetAutomationObject();
			}
		}

		/// <summary>
		/// Gets an enumeration indicating the type of object.
		/// </summary>
		public virtual string Kind
		{
			get
			{
				// TODO:  Add OAProjectItems.Kind getter implementation
				return null;
			}
		}

		/// <summary>
		/// Gets the top-level extensibility object.
		/// </summary>
		public virtual EnvDTE.DTE DTE
		{
			get
			{
				return (EnvDTE.DTE)this.project.DTE;
			}
		}

		/// <summary>
		/// Gets the project hosting the project item or items.
		/// </summary>
		public virtual EnvDTE.Project ContainingProject
		{
			get
			{
				return this.project;
			}
		}

		/// <summary>
		/// Adds one or more ProjectItem objects from a directory to the ProjectItems collection. 
		/// </summary>
		/// <param name="directory">The directory from which to add the project item.</param>
		/// <returns>A ProjectItem object.</returns>
		public virtual EnvDTE.ProjectItem AddFromDirectory(string directory)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Creates a new project item from an existing item template file and adds it to the project. 
		/// </summary>
		/// <param name="fileName">The full path and file name of the template project file.</param>
		/// <param name="name">The file name to use for the new project item.</param>
		/// <returns>A ProjectItem object. </returns>
		public virtual EnvDTE.ProjectItem AddFromTemplate(string fileName, string name)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Creates a new folder in Solution Explorer. 
		/// </summary>
		/// <param name="name">The name of the folder node in Solution Explorer.</param>
		/// <param name="kind">The type of folder to add. The available values are based on vsProjectItemsKindConstants and vsProjectItemKindConstants</param>
		/// <returns>A ProjectItem object.</returns>
		public virtual EnvDTE.ProjectItem AddFolder(string name, string kind)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Copies a source file and adds it to the project. 
		/// </summary>
		/// <param name="filePath">The path and file name of the project item to be added.</param>
		/// <returns>A ProjectItem object. </returns>
		public virtual EnvDTE.ProjectItem AddFromFileCopy(string filePath)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Adds a project item from a file that is installed in a project directory structure. 
		/// </summary>
		/// <param name="fileName">The file name of the item to add as a project item. </param>
		/// <returns>A ProjectItem object. </returns>
		public virtual EnvDTE.ProjectItem AddFromFile(string fileName)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Get Project Item from index
		/// </summary>
		/// <param name="index">Either index by number (1-based) or by name can be used to get the item</param>
		/// <returns>Project Item. null is return if invalid index is specified</returns>
		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")]
		public virtual EnvDTE.ProjectItem Item(object index)
		{
			if(index is int)
			{
				int realIndex = (int)index - 1;
				if(realIndex >= 0 && realIndex < this.items.Count)
				{
					return (EnvDTE.ProjectItem)items[realIndex];
				}
				return null;
			}
			else if(index is string)
			{
				string name = (string)index;
				foreach(EnvDTE.ProjectItem item in items)
				{
					if(String.Compare(item.Name, name, StringComparison.OrdinalIgnoreCase) == 0)
					{
						return item;
					}
				}
			}
			return null;
		}

		/// <summary>
		/// Returns an enumeration for items in a collection. 
		/// </summary>
		/// <returns>An IEnumerator for this object.</returns>
		public virtual IEnumerator GetEnumerator()
		{
			if(this.items == null)
			{
				yield return null;
			}

			int count = items.Count;
			for(int i = 0; i < count; i++)
			{
				yield return items[i];
			}
		}

		#endregion

		#region virtual methods
		/// <summary>
		/// Retrives a list of items associated with the current node.
		/// </summary>
		/// <returns>A List of project items</returns>
		protected IList<EnvDTE.ProjectItem> GetListOfProjectItems()
		{
			List<EnvDTE.ProjectItem> list = new List<EnvDTE.ProjectItem>();
			for(HierarchyNode child = this.NodeWithItems.FirstChild; child != null; child = child.NextSibling)
			{
				EnvDTE.ProjectItem item = child.GetAutomationObject() as EnvDTE.ProjectItem;
				if(null != item)
				{
					list.Add(item);
				}
			}

			return list;
		}
		#endregion
	}
}