using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.Publishing.WebControls;
using Microsoft.SharePoint.Publishing.Fields;

namespace VZ.Controls.CustomFieldControls

/// A Field control that binds to fields of type LinkField and is
/// specialized to select and render embedded flash files.
/// The RenderFieldForDisplay function generates the HTML markup to
/// display the flash file.  The FlashSelector control is
/// used at edit time to allow authors to select a flash file in
/// the Asset Picker dialog box.
{
    public class FlashFieldControl : BaseFieldControl
    {
        private FlashSelector flashSelector = new FlashSelector();

        public FlashFieldControl()
        {
        }

        /// Gets and sets the value in the edit controls
        public override object Value
        {
            get
            {
                LinkFieldValue flashUrlValue = new LinkFieldValue();
                flashUrlValue.NavigateUrl =
                  this.flashSelector.FlashUrl;
                flashUrlValue.Text =
                  LinkFieldValue.GetDefaultDisplayText(flashUrlValue.NavigateUrl);

                return flashUrlValue;
            }
            set
            {
                LinkFieldValue flashLinkFieldValue =
                  value as LinkFieldValue;
                if (null != flashLinkFieldValue)
                {
                    this.flashSelector.FlashUrl =
                      flashLinkFieldValue.NavigateUrl;
                }
                else
                {
                    this.flashSelector.FlashUrl = String.Empty;
                }
            }
        }

        /// Get the default name used to find the template and
        /// control for the FlashSelector in the control
        /// template ASCX files.
        protected override string DefaultTemplateName
        {
            get { return "FlashFieldControl"; }
        }

        private const string AllowExternalUrlsViewStateKey = "AllowExternalUrls";
        /// A flag that determines whether to allow saving of external
        /// flash URLs.
        public bool AllowExternalUrls
        {
            get
            {
                // Return true by default if not already in view state.
                if (ViewState[AllowExternalUrlsViewStateKey] == null)
                {
                    return true;
                }
                return (bool)ViewState[AllowExternalUrlsViewStateKey];
            }
            set
            {
                ViewState[AllowExternalUrlsViewStateKey] = value;
            }
        }

        /// Creates the edit control when not in display mode.
        protected override void CreateChildControls()
        {

            base.CreateChildControls();

            if (this.ControlMode != SPControlMode.Display)
            {
                FlashSelector flashSelectorInTemplate =
                  this.TemplateContainer.FindControl(this.TemplateName)
                  as FlashSelector;

                if (null == flashSelectorInTemplate)
                {
                    // No flash selector was found in the control
                    // template ASCX files. Add the default selector.
                    this.Controls.Add(this.flashSelector);
                }
                else
                {
                    // Get the flash selector from the control
                    // template ASCX file.
                    flashSelectorInTemplate.FlashUrl =
                      this.flashSelector.FlashUrl;
                    this.flashSelector = flashSelectorInTemplate;
                }
            }
        }

        /// Gets the current value for the flash URL as stored
        /// in the list item.
        private string itemFieldValueFlashUrl
        {
            get
            {
                LinkFieldValue currentLinkValue =
                  this.ItemFieldValue as LinkFieldValue;
                if (null != currentLinkValue)
                {
                    return currentLinkValue.NavigateUrl;
                }
                else
                {
                    return String.Empty;
                }
            }
        }

        /// Renders the current list item value for the flash URL
        /// with embedded flash player markup.
        /// <param name="output"></param>
        protected override void
          RenderFieldForDisplay(System.Web.UI.HtmlTextWriter output)
        {
            if (!String.IsNullOrEmpty(this.itemFieldValueFlashUrl))
            {
                output.Write(FlashRenderingUtilities.GetFlashHtmlMarkup(this.itemFieldValueFlashUrl));
            }
        }

        /// Verifies that the FlashUrl is valid.
        public override void Validate()
        {
            base.Validate();
            if (this.IsValid)
            {
                LinkFieldValue currentFlashUrlValue =
                  this.Value as LinkFieldValue;

                if (currentFlashUrlValue ==
                  null || String.IsNullOrEmpty(currentFlashUrlValue.NavigateUrl))
                {
                    // Ensure the field is not required.
                    if (this.Field != null && this.Field.Required)
                    {
                        this.IsValid = false;
                        this.ErrorMessage =
                          "This field is required and must contain a flash file URL.";
                        return;
                    }
                    else
                    {
                        // The field is empty and not required.
                        // The data is valid.
                        return;
                    }
                }

                // Perform validation on the flash file URL.
                HtmlValidationContext validationContext =
                  new HtmlValidationContext();

                if (!this.AllowExternalUrls)
                {
                    // Restrict URLs to be either from the current site
                    // collection or server-relative.
                    validationContext.RestrictUrlsToSiteCollection = true;
                    validationContext.GuidOfThisSiteCollection =
                      SPContext.Current.Site.ID;
                }

                bool droppedTags;
                bool droppedUrls;
                LinkFieldValue validatedValue =
                    validationContext.ValidateLinkValue(
                        currentFlashUrlValue,
                        out droppedTags,
                        out droppedUrls);

                if (droppedUrls || String.IsNullOrEmpty(validatedValue.NavigateUrl))
                {
                    // The flash file URL in the link field value was
                    // not valid so report the error message.
                    // Setting IsValid to false stops saving the page.
                    this.IsValid = false;
                    this.ErrorMessage =
                      "The URL for the flash file was invalid.";
                    if (!this.AllowExternalUrls)
                    {
                        this.ErrorMessage +=
                          "  You must select a URL within the current site collection.";
                    }
                }
            }
        }
    }

    /// This edit control for the FlashFieldControl has
    /// a toolbar and text box for selecting a flash file URL.
    /// This example intentionally uses a separate toolbar button
    /// and text box for the AssetUrlSelctor to show a more complex
    /// example. You can use an AssetUrlSelector control instead of
    /// a TextBox child control, which displays its own browse button.
    public class FlashSelector : WebControl
    {
        private TextBox flashUrlTextBox = new TextBox();

        public FlashSelector()
        {
        }

        /// This is the flash URL value that you can edit in the text
        /// box or Asset Picker dialog box.
        public string FlashUrl
        {
            get { return this.flashUrlTextBox.Text; }
            set { this.flashUrlTextBox.Text = value; }
        }

        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);

            // This ensures that the TextBox child control receives
            // its postback.
            EnsureChildControls();
        }

        /// Gets JavaScript required to launch an Asset Picker dialog
        /// box for choosing a flash file URL.
        private string GetAssetPickerButtonScript()
        {
            AssetUrlSelector flashAssetSelector =
              new AssetUrlSelector();

            // When the AssetUrlSelector control is not added to the
            // page control tree, the Page and ID properties are
            // required because
            // AssetUrlSelector.GetClientLaunchPickerReference()
            // needs register script in the page.
            flashAssetSelector.Page = this.Page;
            flashAssetSelector.ID = "FlashUrlAssetSelector";

            // Uses the TextBox client ID to connect the Asset Picker
            // dialog box to the text box.
            flashAssetSelector.AssetUrlClientID =
              this.flashUrlTextBox.ClientID;

            // Autopostback to see the new flash file rendered after
            // clicking OK on the Asset Picker dialog box.
            flashAssetSelector.AutoPostBack = true;

            flashAssetSelector.OverrideDialogTitle = "Select a flash file";
            flashAssetSelector.OverrideDialogDescription =
              "Select a flash file to embed in this page";
            flashAssetSelector.UseImageAssetPicker = false;

            return flashAssetSelector.GetClientLaunchPickerReference();
        }

        private Literal flashOutput = new Literal();
        protected override void CreateChildControls()
        {
            SimpleToolbar flashSelectorToolbar = new SimpleToolbar();
            flashSelectorToolbar.ID = "ToolBar";

            this.Controls.Add(flashSelectorToolbar);

            Label flashUrlLabel = new Label();
            flashUrlLabel.Text = "Selected flash file URL: ";
            flashUrlLabel.AssociatedControlID = "FlashUrlTextBox";
            this.Controls.Add(flashUrlLabel);

            this.flashUrlTextBox.ID = "FlashUrlTextBox";
            this.flashUrlTextBox.CssClass =
              "ms-input ms-lactiontable sample-flashselector-urltextbox";
            this.Controls.Add(this.flashUrlTextBox);

            // Add the button after the rest so that the text box
            // ClientID is already determined and can be connected
            // in the Asset Picker dialog box client script.
            flashSelectorToolbar.AddToolbarButton(
                "SelectFlashFile",
                "Select a flash file",
                this.GetAssetPickerButtonScript(),
                "Open a picker to select a flash file URL");

            // Add a refresh button to perform a basic postback to
            // to update the FlashUrl rendering.
            flashSelectorToolbar.AddToolbarButton(
                "RefreshFlashFile",
                "Refresh",
                this.Page.ClientScript.GetPostBackEventReference(this,
                  String.Empty),
                  "Refresh the page to reload the current flash file URL",
                  "/_layouts/IMAGES/refresh.gif");

            // If there is a flash file URL, this code creates
            // the flash player markup.
            this.Controls.Add(this.flashOutput);
        }

        protected override void OnPreRender(EventArgs e)
        {
            string flashFileOutputHtml =
              FlashRenderingUtilities.GetFlashHtmlMarkup(this.FlashUrl);
            if (String.IsNullOrEmpty(flashFileOutputHtml))
            {
                this.flashOutput.Text =
                  "<BR>{There is no valid flash file URL to display}<BR>";
            }
            else
            {
                this.flashOutput.Text =
                  "<BR>" + flashFileOutputHtml + "<BR>";
            }

            base.OnPreRender(e);
        }
    }

    public static class FlashRenderingUtilities
    {
        /// Take a flash file URL and generate HTML markup
        /// for playing the file.
        /// <param name="flashUrl"></param>
        public static string GetFlashHtmlMarkup(string flashUrl)
        {
            // HtmlUrlAttributeEncode returns an empty string if the
            // URL protocol is not allowed (e.g., JavaScript:)
            string encodedUrl =
                SPHttpUtility.HtmlUrlAttributeEncode(flashUrl);

            if (String.IsNullOrEmpty(encodedUrl))
            {
                return String.Empty;
            }
            else
            {
                return String.Format(FlashHtmlMarkupFormat, encodedUrl);
            }
        }

        // Currently, this code includes only a parameter for the flash
        // file URL, but it could also include parameters for the
        // width, height, and other rendering properties from field
        // control properties or authored data value properties.
        private const string FlashHtmlMarkupFormat = @"
<object classid=""clsid:d27cdb6e-ae6d-11cf-96b8-444553540000""
    codebase=""http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0""
    width=""300"" height=""450"">
    <param name=""movie"" value=""{0}"" /> 
    <param name=""quality"" value=""high"" />
    <param name=""bgcolor"" value=""#ffffff"" />
    <embed src="" mce_src=""{0}"" quality=""high""
        bgcolor=""#ffffff"" width=""468"" height=""60""
        name=""mymoviename"" align="" type=""application/x-shockwave-flash""
        pluginspage=""http://www.macromedia.com/go/getflashplayer"">
    </embed>
</object>";
    }
}