using System;
using System.IO;
using System.Net;
using System.Windows.Forms;
using System.Diagnostics;

namespace ProxyBrowser
{
    public class WebBrowserEx : WebBrowser
    {
        private string prevPage = null;

        public WebBrowserEx(): base()
        {        
            Initialize();

            Document.Click += new HtmlElementEventHandler(Document_Click);
        }

        private void Document_Click(object sender, HtmlElementEventArgs e)
        {
            string text = null;
            string link = null;

            HtmlElement element = this.Document.GetElementFromPoint(e.MousePosition);

            if (element.TagName == "a" || element.TagName == "A")
            {
                text = element.OuterText;
                link = element.GetAttribute("href");
            }
            else if (element.Parent != null)
            {
                text = element.Parent.OuterText;
                link = element.Parent.GetAttribute("href");
            }

            if (link != null && link != "")
            {
                try
                {
                    MessageBox.Show(text + "\n" + link);
                    e.ReturnValue = false;
                }
                catch
                {
                }
            }
        }

        private void Initialize()
        {
            UserAgent = null;
            Proxy = null;
            Cookie = null;
            Timeout = 5000;
            
        }

        public new void Navigate(string url)
        {
            string buffer = null; // バッファ

            HttpWebRequest req = null;
            HttpWebResponse res = null;
           
            #region リクエストの作成
            try
            {
                /* リクエストの設定 */
                req = (HttpWebRequest)WebRequest.Create(url);
                
                // UserAgent
                if (this.UserAgent != null)
                    req.UserAgent = UserAgent;
                // Proxy
                if(this.Proxy != null)
                    req.Proxy = new WebProxy(this.Proxy);
                // Cookie
                if (this.Cookie != null)
                {
                    req.CookieContainer = new CookieContainer();
                    req.CookieContainer.Add(this.Cookie);
                }
                // Timeout
                if (this.Timeout != 5000)
                    req.Timeout = this.Timeout;

            }
            catch (UriFormatException e)
            {
                Debug.WriteLine(e.ToString());
                return;
            }
            catch (NotSupportedException e)
            {
                Debug.WriteLine(e.ToString());
                return;
            }
            catch (ArgumentException e)
            {
                Debug.WriteLine(e.ToString());
                return;
            }
            catch (System.Security.SecurityException e)
            {
                Debug.WriteLine(e.ToString());
                return;
            }
            #endregion

            try
            {
                res = (HttpWebResponse)req.GetResponse();

                Stream st = res.GetResponseStream();

                using (StreamReader sr = new StreamReader(st))
                    buffer = sr.ReadToEnd();

                st.Close();
            }
            catch (WebException e)
            {
                Debug.WriteLine(e);
                return;
            }
            catch (ProtocolViolationException e)
            {
                Debug.WriteLine(e);
                return;
            }
            catch (InvalidOperationException e)
            {
                Debug.WriteLine(e);
                return;
            }
        }

        public string UserAgent
        { get; set; }

        public string Proxy
        { get; set; }

        public CookieCollection Cookie
        { get; set; }

        public int Timeout
        { get; set; }
    }
}