using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Help.HelpSystem
{
    public static class HelpHtmlWrapper
    {
        public static void Find(object Document, string text)
        {
            var doc = Document as mshtml.IHTMLDocument2;
            if (doc == null || doc.body == null || text == "") return;

            string html = doc.body.innerHTML;
            string temp = "";

            int index = html.IndexOf(text, StringComparison.CurrentCultureIgnoreCase);
            while (index != -1)
            {
                int min = html.IndexOf('<', index);
                int max = html.IndexOf('>', index);

                if (min <= max)
                {
                    temp = "<span style=\"background: magenta;\">" + html.Substring(index, text.Length) + "</span>";
                    html = html.Substring(0, index) + temp + html.Substring(index + text.Length);

                    index += temp.Length - text.Length;
                }

                index = html.IndexOf(text, index + 1, StringComparison.CurrentCultureIgnoreCase);
            }

            doc.body.innerHTML = html;
        }

        public static string GetHtml(object document)
        {
            var doc = document as mshtml.IHTMLDocument2;
            if (doc == null || doc.body == null) return "";

            return doc.body.innerHTML;
        }

        public static void SetHtml(object document, string html)
        {
            var doc = document as mshtml.IHTMLDocument2;
            if (doc == null || doc.body == null) return;

            doc.body.innerHTML = html;
        }
    }
}