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// (C) Copyright 2003-2019 by Autodesk, Inc.
//
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// provided that the above copyright notice appears in all copies and
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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.ApplicationServices;

namespace Revit.SDK.Samples.ValidateParameters.CS
{
    /// <summary>
    /// A class inherits IExternalApplication interface to add an event to the document saving,
    /// which will be called when the document is being saved.
    /// </summary>
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    class Application: IExternalApplication
    {
        #region IExternalApplication Members    
        /// <summary>
        /// Implement this method to implement the external application which should be called when 
        /// Revit starts before a file or default template is actually loaded.
        /// </summary>
        /// <param name="application">An object that is passed to the external application 
        /// which contains the controlled application.</param>
        /// <returns>Return the status of the external application. 
        /// A result of Succeeded means that the external application successfully started. 
        /// Cancelled can be used to signify that the user cancelled the external operation at 
        /// some point.
        /// If false is returned then Revit should inform the user that the external application 
        /// failed to load and the release the internal reference.</returns>
        public Autodesk.Revit.UI.Result OnStartup(UIControlledApplication application)
        {
            try
            {               
                application.ControlledApplication.DocumentSaving += new EventHandler<Autodesk.Revit.DB.Events.DocumentSavingEventArgs>(application_DocumentSaving);
                application.ControlledApplication.DocumentSavingAs += new EventHandler<Autodesk.Revit.DB.Events.DocumentSavingAsEventArgs>(application_DocumentSavingAs);
            }
            catch (Exception)
            {
                return Autodesk.Revit.UI.Result.Failed;
            }
            return Autodesk.Revit.UI.Result.Succeeded;
        }

        /// <summary>
        /// Implement this method to implement the external application which should be called when 
        /// Revit is about to exit,Any documents must have been closed before this method is called.
        /// </summary>
        /// <param name="application">An object that is passed to the external application 
        /// which contains the controlled application.</param>
        /// <returns>Return the status of the external application. 
        /// A result of Succeeded means that the external application successfully shutdown. 
        /// Cancelled can be used to signify that the user cancelled the external operation at 
        /// some point.
        /// If false is returned then the Revit user should be warned of the failure of the external 
        /// application to shut down correctly.</returns>
        public Autodesk.Revit.UI.Result OnShutdown(UIControlledApplication application)
        {
            try
            {
                application.ControlledApplication.DocumentSaving -= new EventHandler<Autodesk.Revit.DB.Events.DocumentSavingEventArgs>(application_DocumentSaving);
                application.ControlledApplication.DocumentSavingAs -= new EventHandler<Autodesk.Revit.DB.Events.DocumentSavingAsEventArgs>(application_DocumentSavingAs);
            }
            catch (Exception)
            {
                return Autodesk.Revit.UI.Result.Failed;
            }
            return Autodesk.Revit.UI.Result.Succeeded;
        }

        /// <summary>
        /// Subscribe to the DocumentSaving event to be notified when Revit is just about to save the document. 
        /// </summary>
        /// <param name="sender">sender</param>
        /// <param name="e">The event argument used by DocumentSaving event. </param>
        private void application_DocumentSaving(Object sender, Autodesk.Revit.DB.Events.DocumentSavingEventArgs e)
        {
            validateParameters(e.Document);
        }

        /// <summary>
        /// Subscribe to the DocumentSavingAs event to be notified when Revit is just about to save the document with a new file name. 
        /// </summary>
        /// <param name="sender">sender</param>
        /// <param name="e">The event argument used by DocumentSavingAs event.</param>
        private void application_DocumentSavingAs(Object sender, Autodesk.Revit.DB.Events.DocumentSavingAsEventArgs e)
        {   
            validateParameters(e.Document);
        }

        /// <summary>
        /// The method is to validate parameters via FamilyParameter and FamilyType
        /// </summary>
        /// <param name="doc">the document which need to validate parameters</param>
        private void validateParameters(Document doc)
        {
            List<string> errorInfo = new List<string>();
            FamilyManager familyManager;
            if (doc.IsFamilyDocument)
            {
                familyManager = doc.FamilyManager;
                errorInfo = Command.ValidateParameters(familyManager);
            }
            else
            {
                errorInfo.Add("The current document isn't a family document, so the validation doesn't work correctly!");
            }
            using (MessageForm msgForm = new MessageForm(errorInfo.ToArray()))
            {
                msgForm.StartPosition = FormStartPosition.CenterParent;
                msgForm.ShowDialog();
            }
        }
        #endregion
    }
}