/* -*- Mode: C#; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/ 
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License. 
 *
 * The Original Code is Manticore.
 * 
 * The Initial Developer of the Original Code is
 * Silverstone Interactive. Portions created by Silverstone Interactive are
 * Copyright (C) 2001 Silverstone Interactive. 
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU Public License (the "GPL"), in which case the
 * provisions of the GPL are applicable instead of those above.
 * If you wish to allow use of your version of this file only
 * under the terms of the GPL and not to allow others to use your
 * version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL.  If you do not delete
 * the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * Contributor(s):
 *  Ben Goodger <ben@netscape.com>
 *
 */

namespace Silverstone.Manticore.Layout
{
  using System;
  using Microsoft.Win32;
  using System.Drawing;
  using System.ComponentModel;
  using System.Windows.Forms;
  using System.Runtime.InteropServices;

  // Trident
  using AxSHDocVw;
  using MSHTML;
  
  // Gecko
  using AxMOZILLACONTROLLib;
  using MOZILLACONTROLLib;

  using Silverstone.Manticore.Core;
  using Silverstone.Manticore.Browser;

  public class WebBrowser : UserControl
  {
    private AxWebBrowser trident;
    private AxMozillaBrowser gecko;

    private BrowserWindow mBrowserWindow;

    private bool mBlankView = false;

    public WebBrowser(BrowserWindow aBrowserWindow)
    {
      mBrowserWindow = aBrowserWindow;
      this.Dock = DockStyle.Fill;
    }

    protected override void OnPaint(PaintEventArgs e)
    {
      // Draw an inset border around the client area for
      // blank documents. 
      Graphics g = e.Graphics;

      g.DrawLine(SystemPens.ControlDark, 
                 new Point(0, 0), 
                 new Point(this.Width, 0));
      g.DrawLine(SystemPens.ControlDark,
                 new Point(0, 0),
                 new Point(0, this.Height));
      g.DrawLine(SystemPens.ControlDarkDark, 
                 new Point(1, 1),
                 new Point(1 + (this.Width - 1), 1));
      g.DrawLine(SystemPens.ControlDarkDark,
                 new Point(1, 1),
                 new Point(1, 1 + (this.Height - 1)));
      g.DrawLine(SystemPens.ControlLightLight, 
                 new Point(this.Width - 1, 0),
                 new Point(this.Width - 1, this.Height));
      g.DrawLine(SystemPens.ControlLightLight,
                 new Point(0, this.Height - 1),
                 new Point(this.Width, this.Height - 1));
      g.DrawLine(SystemPens.ControlLight,
                 new Point(this.Width - 2, 1),
                 new Point(this.Width - 2, this.Height - 2));
      g.DrawLine(SystemPens.ControlLight,
                 new Point(1, this.Height - 2),
                 new Point(this.Width - 2, this.Height - 2));
    }

    protected override void OnResize(EventArgs e)
    {
      if (mBlankView)
        Invalidate();
      if (gecko != null)
        gecko.Size = new Size(this.ClientSize.Width, this.ClientSize.Height);
      else if (trident != null)
        trident.Size = new Size(this.ClientSize.Width, this.ClientSize.Height);
    }

    public void RealizeLayoutEngine()
    {
      if (gecko == null && trident == null) 
      {
        String layoutEngine = ServiceManager.Preferences.GetStringPref("browser.layoutengine");
        if (layoutEngine == "") 
          layoutEngine = "gecko";
        SwitchLayoutEngine(layoutEngine);
      }
    }

    public void SwitchLayoutEngine(String id)
    {
      AxHost host = null;
      String url = "about:blank";
      
      switch (id) {
      case "trident":
        if (gecko != null) {
          url = gecko.LocationURL;
          this.Controls.Remove(gecko as AxHost);
          gecko = null;
        }

        if (trident == null) {
          trident = new AxWebBrowser();
          host = trident as AxHost;
        }

        break;
      default:
        if (trident != null) {
          url = trident.LocationURL;
          this.Controls.Remove(trident as AxHost);
          trident = null;
        }

        if (gecko == null) {
          gecko = new AxMozillaBrowser(); 
          host = gecko as AxHost;
        }
        break;
      }

      if (host != null) {
        host.BeginInit();
        host.TabIndex = 1;
        host.Dock = DockStyle.Fill;
        host.EndInit();
        this.Controls.Add(host);
      }
      
      // Add appropriate content area listeners
      AddListeners();

      ServiceManager.Preferences.SetStringPref("browser.layoutengine", id);

      LoadURL(url, false);
    }

    public Object currentLayoutEngine
    {
      get {
        if (gecko != null) 
          return gecko;
        else if (trident != null)
          return trident;
        return null;
      }
    }

    public void LoadURL(String url, Boolean bypassCache)
    {
      if (!mBlankView)
        mBlankView = true;

      // XXX - neither IE nor Mozilla implement all of the
      //       load flags properly. Mozilla should at least be 
      //       made to support ignore-cache and ignore-history.
      //       This will require modification to the ActiveX
      //       control.
      RealizeLayoutEngine();
      Object o = null;
      if (gecko != null)
        gecko.Navigate(url, ref o, ref o, ref o, ref o);
      else if (trident != null)
        trident.Navigate(url, ref o, ref o, ref o, ref o);
    }

    public String URL
    {
      get {
        if (gecko != null)
          return gecko.LocationURL;
        else if (trident != null)
          return trident.LocationURL;
        return "";
      }
      set {
        LoadURL(value, false);
        // XXX why can't we return |value| here?
      }
    }

    public void RefreshPage() 
    {
      // XXX Should take a refresh level and use Refresh2.
      RealizeLayoutEngine();
      Object o = 0 as Object;
      if (gecko != null)
        gecko.Refresh2(ref o);
      else if (trident != null)
        trident.Refresh2(ref o);
    }

    public void Stop()
    {
      RealizeLayoutEngine();
      if (gecko != null)
        gecko.Stop();
      else if (trident != null)
        trident.Stop();
    }

    public void GoBack()
    {
      RealizeLayoutEngine();
      if (gecko != null)
        gecko.GoBack();
      else if (trident != null)
        trident.GoBack();
    }

    public void GoForward()
    {
      RealizeLayoutEngine();
      if (gecko != null)
        gecko.GoForward();
      else if (trident != null)
        trident.GoForward();
    }

    public void GoHome()
    {
      // XXX - need to implement "Home" preference
      String homepageURL = ServiceManager.Preferences.GetStringPref("browser.homepage");
      LoadURL(homepageURL, false);
    }

    private void AddListeners()
    {
      AddProgressListener();
      AddTitleChangeListener();
      AddStatusChangeListener();
      AddNewWindowListener();
    }

    private bool mProgressChangeGecko = false;
    private bool mProgressChangeTrident = false;
    private void AddProgressListener() 
    {
      if (gecko != null && !mProgressChangeGecko) {
        gecko.ProgressChange += new AxMOZILLACONTROLLib.DWebBrowserEvents2_ProgressChangeEventHandler(OnProgressGecko);
        mProgressChangeGecko = true;
      }
      else if (trident != null && !mProgressChangeTrident) {
        trident.ProgressChange += new AxSHDocVw.DWebBrowserEvents2_ProgressChangeEventHandler(OnProgressTrident);
        mProgressChangeTrident = true;
      }
    }
    public void OnProgressGecko(Object sender, AxMOZILLACONTROLLib.DWebBrowserEvents2_ProgressChangeEvent e) 
    {
      mBrowserWindow.OnProgress(e.progress, e.progressMax);
    }
    public void OnProgressTrident(Object sender, AxSHDocVw.DWebBrowserEvents2_ProgressChangeEvent e) 
    {
      mBrowserWindow.OnProgress(e.progress, e.progressMax);
    }

    private bool mTitleChangeGecko = false;
    private bool mTitleChangeTrident = false;
    private void AddTitleChangeListener()
    {
      if (gecko != null && !mTitleChangeGecko) {
        gecko.TitleChange += new AxMOZILLACONTROLLib.DWebBrowserEvents2_TitleChangeEventHandler(OnTitleChangeGecko);
        mTitleChangeGecko = true;
      }
      else if (trident != null && !mTitleChangeTrident) {
        trident.TitleChange += new AxSHDocVw.DWebBrowserEvents2_TitleChangeEventHandler(OnTitleChangeTrident);
        mTitleChangeTrident = true;
      }
    }
    public void OnTitleChangeGecko(Object sender, AxMOZILLACONTROLLib.DWebBrowserEvents2_TitleChangeEvent e)
    {
      mBrowserWindow.OnTitleChange(e.text);
    }
    public void OnTitleChangeTrident(Object sender, AxSHDocVw.DWebBrowserEvents2_TitleChangeEvent e)
    {
      mBrowserWindow.OnTitleChange(e.text);
    }

    private bool mStatusChangeGecko = false;
    private bool mStatusChangeTrident = false;
    private void AddStatusChangeListener()
    {
      if (gecko != null && !mStatusChangeGecko) {
        gecko.StatusTextChange += new AxMOZILLACONTROLLib.DWebBrowserEvents2_StatusTextChangeEventHandler(OnStatusChangeGecko);
        mStatusChangeGecko = true;
      }
      else if (trident != null && !mStatusChangeTrident) {
        trident.StatusTextChange += new AxSHDocVw.DWebBrowserEvents2_StatusTextChangeEventHandler(OnStatusChangeTrident);
        mStatusChangeTrident = true;
      }
    }
    public void OnStatusChangeGecko(Object sender, AxMOZILLACONTROLLib.DWebBrowserEvents2_StatusTextChangeEvent e)
    {
      mBrowserWindow.OnStatusTextChange(e.text);
    }
    public void OnStatusChangeTrident(Object sender, AxSHDocVw.DWebBrowserEvents2_StatusTextChangeEvent e)
    {
      mBrowserWindow.OnStatusTextChange(e.text);
    }

    private bool mNewWindowGecko = false;
    private bool mNewWindowTrident = false;
    private void AddNewWindowListener()
    {
      if (gecko != null && !mNewWindowGecko) {
        gecko.NewWindow2 += new AxMOZILLACONTROLLib.DWebBrowserEvents2_NewWindow2EventHandler(OnNewWindowGecko);
        mNewWindowGecko = true;
      }
      else if (trident != null && !mNewWindowTrident) {
        trident.NewWindow2 += new AxSHDocVw.DWebBrowserEvents2_NewWindow2EventHandler(OnNewWindowTrident);
        mNewWindowTrident = true;
      }
    }
    public void OnNewWindowGecko(Object sender, AxMOZILLACONTROLLib.DWebBrowserEvents2_NewWindow2Event e)
    {
      Object browser = mBrowserWindow.OnNewWindow();
      AxMozillaBrowser webBrowser = browser as AxMozillaBrowser;
      if (webBrowser != null)
        e.ppDisp = webBrowser;
    }
    public void OnNewWindowTrident(Object sender, AxSHDocVw.DWebBrowserEvents2_NewWindow2Event e)
    {
      Object browser = mBrowserWindow.OnNewWindow();
      AxWebBrowser webBrowser = browser as AxWebBrowser;
      if (webBrowser != null)
        e.ppDisp = webBrowser;
    }
    
    private bool mFileDownloadGecko = false;
    private bool mFileDownloadTrident = false;
    private void AddFileDownloadListener()
    {
      if (gecko != null && !mFileDownloadGecko) 
      {
        mFileDownloadGecko = true;
      }
      else if (trident != null && !mFileDownloadTrident) 
      {
        trident.FileDownload += new AxSHDocVw.DWebBrowserEvents2_FileDownloadEventHandler(OnFileDownloadTrident);
        mFileDownloadTrident = true;
      }
    }
    public void OnFileDownloadTrident(Object sender, AxSHDocVw.DWebBrowserEvents2_FileDownloadEvent e)
    {
      e.cancel = false;
    }
  }
}