/* Copyright (C) Elisy.Net 2008 http://code.elisy.net
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>. 
*/
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

using System.Windows.Browser;

namespace Elisy.Scab.Services
{
    public class TraceModule : Module
    {
        public override void Initialize(WorkItem workItem)
        {
            if (!workItem.IsRegistered(typeof(Trace), null))
                workItem.RegisterType(typeof(Trace), typeof(Trace), null);
        }
    }

    public class Trace
    {
        public Trace()
        {
            IndentLevel = 0;
        }


        /// <summary>
        /// Id of the element on the Html page
        /// </summary>
        public string DestinationId { get; set; }

        private HtmlElement _destination;
        public HtmlElement Destination 
        { 
            get 
            {
                if(string.IsNullOrEmpty(DestinationId))
                    DestinationId = "guid_" + Guid.NewGuid().ToString().Replace("-", "_");
                else
                    _destination = HtmlPage.Document.GetElementById(DestinationId);

                if (_destination == null)
                {
                    _destination = HtmlPage.Document.CreateElement("div");
                    _destination.SetProperty("id", DestinationId);
                    HtmlPage.Document.Body.AppendChild(_destination);
                }

                return _destination; 
            }

            set 
            {
                _destination = value;
                DestinationId = _destination.GetProperty("id").ToString();
            }
        }


        /// <summary>
        /// Gets or sets the indent level.
        /// </summary>
        public int IndentLevel { get; set; }


        /// <summary>
        /// Writes a message to the trace destination
        /// </summary>
        /// <param name="message"></param>
        public void Write(string message)
        {
            string innerHtml = Destination.GetProperty("innerHTML").ToString();
            Destination.SetProperty("innerHTML", innerHtml + GetSeparator() + message);
        }


        private string GetSeparator()
        {
            string value = "";
            for (int i=0; i<IndentLevel; i++)
                value += "&nbsp;&nbsp;&nbsp;&nbsp;";
            return value;
        }


        /// <summary>
        /// Writes a html fragment to the trace destination
        /// </summary>
        /// <param name="message"></param>
        public void WriteHtml(string html)
        {
            string innerHtml = Destination.GetProperty("innerHTML").ToString();
            Destination.SetProperty("innerHTML", innerHtml + html);
        }



        /// <summary>
        /// Writes a message to the trace destination
        /// </summary>
        /// <param name="message"></param>
        public void WriteLine(string message)
        {
            string innerHtml = Destination.GetProperty("innerHTML").ToString();
            Destination.SetProperty("innerHTML", innerHtml + GetSeparator() + message + "<br/>");
        }
    }
}