using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;

namespace Search4SharePoint
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                String query = Request.QueryString["q"];
                if (!String.IsNullOrEmpty(query))
                {
                    q.Text = SanitizeUserInput(HttpUtility.UrlDecode(query.Trim()));
                }
            }
        }

        /// <summary>
        /// Using the Google form field values, redirect to this page with those values in the URL's
        /// query string.  Google's JavaScript will pick up these parameters, perform the search, and
        /// display the results on your page.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void _btnSearch_Click(Object sender, EventArgs e)
        {
            if (!IsValid)
                return;

            Response.Redirect(
                String.Format(
                    "Default.aspx?q={0}&cx={1}&cof={2}",
                    HttpUtility.UrlEncode(SanitizeUserInput(q.Text.Trim())),
                    HttpUtility.UrlEncode(cx.Value),
                    HttpUtility.UrlEncode(cof.Value)
                    ),
                false
                );

            Context.ApplicationInstance.CompleteRequest();
        }

        /// <summary>
        /// Strip tags from user input.
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        private String SanitizeUserInput(String text)
        {
            if (String.IsNullOrEmpty(text))
                return String.Empty;

            String rxPattern = "<(?>\"[^\"]*\"|'[^']*'|[^'\">])*>";
            Regex rx = new Regex(rxPattern);
            String output = rx.Replace(text, String.Empty);

            return output;
        }
    }
}