using System;
using System.Collections.Generic;
using System.Net;
using System.Web;
using WebDAVSharp.Server.Adapters;
using WebDAVSharp.Server.Exceptions;
using WebDAVSharp.Server.Stores;

namespace WebDAVSharp.Server.MethodHandlers {
	/// <summary>
	/// This class implements the <c>PROPFIND</c> HTTP method for WebDAV#.
	/// </summary>
	internal class WebDavHeadMethodHandler : WebDavMethodHandlerBase, IWebDavMethodHandler {
		/// <summary>
		/// Gets the collection of the names of the HTTP methods handled by this instance.
		/// </summary>
		/// <value>
		/// The names.
		/// </value>
		public IEnumerable<string> Names {
			get {
				return new[] { "HEAD" };
			}
		}

		/// <summary>
		/// Processes the request.
		/// </summary>
		/// <param name="server">The <see cref="WebDavServer" /> through which the request came in from the client.</param>
		/// <param name="context">The 
		/// <see cref="IHttpListenerContext" /> object containing both the request and response
		/// objects to use.</param>
		/// <param name="store">The <see cref="IWebDavStore" /> that the <see cref="WebDavServer" /> is hosting.</param>
		/// <exception cref="WebDavNotFoundException"><para>
		///   <paramref name="context" /> specifies a request for a store item that does not exist.</para>
		/// <para>- or -</para>
		/// <para>
		///   <paramref name="context" /> specifies a request for a store item that is not a document.</para></exception>
		/// <exception cref="WebDavConflictException"><paramref name="context" /> specifies a request for a store item using a collection path that does not exist.</exception>
		public void ProcessRequest(WebDavServer server, HttpContext context, IWebDavStore store, String fileName) {
			// Get the parent collection of the item
			IWebDavStoreCollection collection = GetParentCollection(server, store, fileName);

			// Get the item from the collection
			IWebDavStoreItem item = GetItemFromCollection(collection, fileName);

			/***************************************************************************************************
			* Send the response
			***************************************************************************************************/

			// HttpStatusCode doesn't contain WebDav status codes, but HttpWorkerRequest can handle these WebDav status codes
			context.Response.StatusCode = (int)HttpStatusCode.OK;
			context.Response.StatusDescription = HttpWorkerRequest.GetStatusDescription((int)HttpStatusCode.OK);

			// set the headers of the response
			//context.Response.ContentLength64 = 0;
			context.Response.SuppressContent = true;
			context.Response.AppendHeader("Content-Type", "text/html");
			context.Response.AppendHeader("Last-Modified", item.ModificationDate.ToUniversalTime().ToString("R"));

			//context.Response.Close();
		}
	}
}