using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Configuration;
using System.Reflection;


namespace ComponentArt.Web.UI
{
  /// <summary>
  /// ComponentArt base WebControl class. Provides licensing, client-script rendering, and search engine stamp rendering services. All ComponentArt server controls inherit from this class. 
  /// </summary>
  public abstract class WebControl : System.Web.UI.WebControls.WebControl
	{
    #region Public Properties 

    /// <summary>
    /// ID of the client-side object corresponding to this control.
    /// </summary>
    /// <value>The name of the JavaScript global variable representing this control's client-side object.</value>
    /// <remarks>ClientObjectId is often the same as ClientID. However this cannot always be the case, 
    /// because not all ClientID values are valid JavaScript variable names.</remarks>
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [Browsable(false)]
    [Description("ID of the client-side object corresponding to this control.")]
    public string ClientObjectId
    {
      get
      {
        return this.GetSaneId();
      }
    }

    /// <summary>
    /// Relative or absolute path to the folder containing the client-side script file(s).
    /// </summary>
    /// <remarks>
    /// The actual JS files are placed in a folder named to correspond to the version of Web.UI being used, inside a folder named
    /// <b>componentart_webui_client</b>, which is placed in the folder specified by this property.
    /// </remarks>
    [Category("Support")]
    [DefaultValue("")]
    [Description("Relative or absolute path to the folder containing the client-side script file(s).")]
    public string ClientScriptLocation
    {
      get
      {
        object o = ViewState["ClientScriptLocation"]; 
        return (o == null) ? String.Empty : Utils.ConvertUrl(Context, string.Empty, (string)o); 
      }

      set
      {
        ViewState["ClientScriptLocation"] = value; 
      }
    }
    
    /// <summary>
    /// Specifies the level of client-side content that the control renders.
    /// </summary>
    /// <value>
    /// Gets or sets a value that allows you to override automatic detection of browser capabilities and to specify 
    /// how the control renders.  Default is Auto, indicating that the control will decide based on the client's 
    /// browser whether it is appropriate to serve it uplevel or downlevel content.
    /// </value>
    [DefaultValue(ClientTargetLevel.Auto)]
    [Description("Specifies the level of client-side content that the control renders.")]
    public ClientTargetLevel ClientTarget
    {
      get
      {
        return Utils.ParseClientTargetLevel(ViewState["ClientTarget"], ClientTargetLevel.Auto);
      }
      set
      {
        ViewState["ClientTarget"] = value;
      }
    }

    /// <summary>
    /// Whether this control considers the current browser down-level.
    /// </summary>
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    [Browsable(false)]
    public bool IsDownLevelBrowser
    {
      get
      {
        if(Context != null)
        {
          return this.IsDownLevel();
        }
        else
          return false;
      }
    }

    /// <summary>
    /// Whether to render the search engine stamp.
    /// </summary>
    [Category("Support")]
    [DefaultValue(true)]
    [Description("Whether to render the search engine stamp.")]
    public bool RenderSearchEngineStamp
    {
      get 
      {
        object o = ViewState["RenderSearchEngineStamp"]; 
        return (o == null) ? true : (bool) o; 
      }
      set 
      {
        ViewState["RenderSearchEngineStamp"] = value;
      }
    }

    #endregion 

    #region Public Methods 

    /// <summary>
    /// IsLicensed method.
    /// </summary>
    /// <returns>Whether this control is licensed.</returns>
    public virtual bool IsLicensed()
    {
      try
      {
        License = LicenseManager.Validate(this.GetType(), this);
        return true; 
      }
      catch
      {
        return false; 
      }
    }

    #endregion 

    #region Protected Properties 

    protected System.ComponentModel.License License = null;

    #endregion 

    #region Protected Methods

    protected string GetSaneId()
    {
      if(this.ClientID == null || this.ClientID == "")
      {
        throw new Exception("An ID must be defined on the control.");
      }
      else
      {
        return this.ClientID.Replace("$", "_").Replace("{", "_").Replace("}", "_");
      }
    }

    protected bool IsBrowserSearchEngine()
    {
      if(Context == null || Context.Request == null)
        return false;

      string sUserAgent = Context.Request.UserAgent;
      if(sUserAgent == null)
      {
        return false;
      }

      return (
        sUserAgent.IndexOf("Googlebot") >= 0 ||
        sUserAgent.IndexOf("SideWinder") >= 0 ||
        sUserAgent.IndexOf("inktomi") >= 0 ||
        sUserAgent.IndexOf("ZyBorg") >= 0 ||
        sUserAgent.IndexOf("FAST-WebCrawler") >= 0 ||
        sUserAgent.IndexOf("Lycos") >= 0 ||
        sUserAgent.IndexOf("Scooter") >= 0 ||
        sUserAgent.IndexOf("NPBot") >= 0 ||
        sUserAgent.IndexOf("Gigabot") >= 0 ||
        sUserAgent.IndexOf("MSNBOT") >= 0 ||
        sUserAgent.IndexOf("SearchSpider") >= 0 ||
        sUserAgent.IndexOf("Vagabondo") >= 0 ||
        sUserAgent.IndexOf("almaden") >= 0 ||
        sUserAgent.IndexOf("CipinetBot") >= 0 ||
        sUserAgent.IndexOf("QuepasaCreep") >= 0 ||
        sUserAgent.IndexOf("Gaisbot") >= 0 ||
        sUserAgent.IndexOf("DoCoMo") >= 0 ||
        sUserAgent.IndexOf("grub-client") >= 0 ||
        sUserAgent.IndexOf("Openbot") >= 0 ||
        sUserAgent.IndexOf("Ask Jeeves") >= 0 ||
        sUserAgent.IndexOf("Girafabot") >= 0
        );
    }

    // Whether the control is running in design mode 
    protected bool IsRunningInDesignMode()
    { 
      return HttpContext.Current == null;
    }

    protected abstract bool IsDownLevel();

    protected virtual void ComponentArtPreRender(EventArgs e)
    {
    }
    
    protected abstract void ComponentArtRender(HtmlTextWriter output); 
    
    protected string GetResourceContent(string sFileName)
    {
      try
      {
        Stream oStream = Assembly.GetAssembly(this.GetType()).GetManifestResourceStream(sFileName);
        StreamReader oReader = new StreamReader(oStream);
  		
        return oReader.ReadToEnd();
      }
      catch(Exception ex)
      {
        throw new Exception("Could not read resource \"" + sFileName + "\": " + ex);
      }
    }
    
    

    protected void RenderCrawlerStamp(HtmlTextWriter output)
    {
      Assembly thisAssembly = Assembly.GetExecutingAssembly();
      string thisAssemblyVersion = thisAssembly.GetName().Version.ToString();
      string thisProductName = this.GetType().ToString().Replace("ComponentArt.Web.UI.", ""); 
      
      output.RenderBeginTag(HtmlTextWriterTag.Noscript);

      output.Write("ComponentArtSCStamp " + thisProductName + " " + thisAssemblyVersion);

      output.RenderEndTag(); // </noscript>
    }
    
    
    protected override void OnPreRender(EventArgs e)
    {
      base.OnPreRender(e);
      if (IsLicensed()) ComponentArtPreRender(e); 
    }
    
    protected override void Render(HtmlTextWriter output)
    {
      // Render demo warning if required 
      //if (!IsLicensed())
      //{
      //  RenderRedistributableWarning(output); 
      //  return; 
      //}
      
      // Render control 
      ComponentArtRender(output); 

      if(this.IsBrowserSearchEngine() && this.RenderSearchEngineStamp)
      {
        RenderCrawlerStamp(output);
      }
    }
    
    protected void RenderRedistributableWarning(HtmlTextWriter output)
    {
      output.Write("<div style=\"background-color:#3F3F3F;border:1px;border-style:solid;border-bottom-color:black;border-right-color:black;border-left-color:lightslategray;border-top-color:lightslategray;color:cornsilk;padding:2px;font-family:verdana;font-size:11px;\">");
      string productName = this.GetType().ToString().Replace("ComponentArt.Web.UI.", ""); 

      output.Write("<b>ComponentArt " + productName + "</b> :: ");
      output.Write("Unlicensed version. <br><br>"); 
      output.Write("This version is licensed for single application use only. <br><br>"); 
      output.Write("You can download the free trial version <a href=http://www.ComponentArt.com/ target=_blank><font color=silver>here</font></a>."); 
      output.Write("</div>"); 
    }
    
       
    protected void WriteGlobalClientScript(HtmlTextWriter output, string sDefaultPath, string sScriptFile)
    {
      string sScript = GenerateClientScriptBlock(sDefaultPath, sScriptFile);
		  string sInstanceId = sScriptFile;

      output.Write(sScript);
    }

    #endregion 

    #region Private Members

    

    internal bool IsInUpdatePanel()
    {
      for (Control oControl = this.Parent; oControl != null; oControl = oControl.Parent)
      {
        if (oControl.GetType().FullName == "Microsoft.Web.UI.UpdatePanel")
        {
          return true;
        }
      }

      return false;
    }

    private string GenerateClientScriptBlock(string sDefaultPath, string sScriptFile)
    {
      string sScript = string.Empty;
      string sScriptLocation = string.Empty;


      if(this.ClientScriptLocation != string.Empty)
      {
        string sVersionString =
          Assembly.GetExecutingAssembly().GetName().Version.Major.ToString() + "_" +
          Assembly.GetExecutingAssembly().GetName().Version.Minor.ToString() + "_" +
          Assembly.GetExecutingAssembly().GetName().Version.Build.ToString();
        sScriptLocation = Path.Combine(Path.Combine(this.ClientScriptLocation, sVersionString), sScriptFile).Replace("\\", "/");
			}


      if(sScriptLocation != string.Empty)
      {
        // Do we have a tilde?
        if(sScriptLocation.StartsWith("~") && Context != null && Context.Request != null)
        {
          string sAppPath = Context.Request.ApplicationPath;
          if(sAppPath.EndsWith("/"))
          {
            sAppPath = sAppPath.Substring(0, sAppPath.Length - 1);
          }

          sScriptLocation = sScriptLocation.Replace("~", sAppPath);
        }

        if(File.Exists(Context.Server.MapPath(sScriptLocation)))
        {
          sScript = "<script src=\"" + sScriptLocation + "\" type=\"text/javascript\"></script>";
        }
        else
        {
          throw new Exception(sScriptLocation + " not found");
        }
      }
      else 
      {
        // If everything failed, emit our internal script
        string sResourceUrl = Page.ClientScript.GetWebResourceUrl(this.GetType(), sDefaultPath + "." + sScriptFile);
        sResourceUrl = sResourceUrl.Replace("&", "&amp;");
        sScript = "<script src=\"" + sResourceUrl + "\" type=\"text/javascript\"></script>";

      }

      return sScript;
    }

    #endregion 
	}
	
  /// <summary>
  /// Specifies the level of client-side content that the control renders.
  /// </summary>
  public enum ClientTargetLevel
  {
    /// <summary>
    /// Automatically detect whether the browser should be served uplevel or downlevel content.
    /// </summary>
    Auto,

    /// <summary>
    /// Serve downlevel content.  This is typically appropriate for older and less advanced browsers.
    /// </summary>
    Downlevel,
    
    /// <summary>
    /// Serve uplevel content.  This is typically appropriate for newer and more advanced browsers.
    /// </summary>
    Uplevel    
  }

}