using System;
using System.Collections.Generic;
using System.Text;
using javax.faces.application;
using java.util;
using javax.faces.context;
using javax.faces.component;
using javax.faces.render;
using System.Web.UI;
using System.Web;
using System.Diagnostics;

namespace Mainsoft.Web.Hosting
{
	public abstract class BaseFacesViewHandler : ViewHandler
	{
		readonly ViewHandler _viewHandler;
		public static readonly string NAMESPACE = "__NAMESPACE";

		public BaseFacesViewHandler (ViewHandler viewHandler) {
			_viewHandler = viewHandler;
		}

		public override string getActionURL (FacesContext facesContext, string viewId) {
			return _viewHandler.getActionURL (facesContext, viewId);
		}

		public override Locale calculateLocale (FacesContext facesContext) {
			return _viewHandler.calculateLocale (facesContext);
		}

		public override String calculateRenderKitId (FacesContext facesContext) {
			return _viewHandler.calculateRenderKitId (facesContext);
		}

		public override UIViewRoot createView (FacesContext facesContext, String viewId) {

			// create instance of Page by viewId
			StringBuilder sb = new StringBuilder ();
			sb.Append (facesContext.getExternalContext ().getRequestContextPath ());
			sb.Append (viewId);
			IHttpHandler page = PageParser.GetCompiledPageInstance (sb.ToString (), null, ((AspNetFacesContext) facesContext).Context);

			HttpContext context = ((AspNetFacesContext) facesContext).Context;
			page.ProcessRequest (context);
			
			UIViewRoot uiViewRoot = _viewHandler.createView (facesContext, viewId);
			uiViewRoot.getChildren ().add (0, (UIComponent) page);
			
			Trace.WriteLine ("Created view " + viewId);
			return uiViewRoot;
		}

		public override String getResourceURL (FacesContext facesContext, String path) {
			return _viewHandler.getResourceURL (facesContext, path);
		}

		public override void renderView (FacesContext facesContext, UIViewRoot viewToRender) {
			if (viewToRender == null)
				throw new ArgumentNullException ("viewToRender", "viewToRender must not be null");
			((UIComponent) viewToRender.getChildren ().get (0)).encodeChildren (facesContext);
		}


		public override UIViewRoot restoreView (FacesContext facesContext, String viewId) {
			return _viewHandler.restoreView (facesContext, viewId);
		}

		public override void writeState (FacesContext facesContext) {
			StateManager manager = facesContext.getApplication ().getStateManager ();
			StateManager.SerializedView serializedView = manager.saveSerializedView (facesContext);
			manager.writeState (facesContext, serializedView);
		}

		public virtual string EncodeNamespace (FacesContext facesContext, string value) {
			HttpContext context = ((AspNetFacesContext) facesContext).Context;
			string ns = context.Request.Form [NAMESPACE];
			if (String.IsNullOrEmpty (ns))
				return value;
			return ns + value;
		}
	}
}