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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.DB.Fabrication;

namespace Revit.SDK.Samples.FabricationPartLayout.CS
{
   /// <summary>
   /// Implements the Revit add-in interface IExternalCommand
   /// </summary>
   [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
   [Autodesk.Revit.Attributes.Regeneration(Autodesk.Revit.Attributes.RegenerationOption.Manual)]
   public class ConvertToFabrication : IExternalCommand
   {
      /// <summary>
      /// Implement this method as an external command for Revit.
      /// </summary>
      /// <param name="commandData">An object that is passed to the external application 
      /// which contains data related to the command, 
      /// such as the application object and active view.</param>
      /// <param name="message">A message that can be set by the external application 
      /// which will be displayed if a failure or cancellation is returned by 
      /// the external command.</param>
      /// <param name="elements">A set of elements to which the external application 
      /// can add elements that are to be highlighted in case of failure or cancellation.</param>
      /// <returns>Return the status of the external command. 
      /// A result of Succeeded means that the API external method functioned as expected. 
      /// Cancelled can be used to signify that the user cancelled the external operation 
      /// at some point. Failure should be returned if the application is unable to proceed with 
      /// the operation.</returns>
      public virtual Result Execute(ExternalCommandData commandData
          , ref string message, ElementSet elements)
      {
         try
         {
            Document doc = commandData.Application.ActiveUIDocument.Document;

            // get the user selection
            UIDocument uidoc = commandData.Application.ActiveUIDocument;
            ICollection<ElementId> collection = uidoc.Selection.GetElementIds();

            if (collection.Count > 0)
            {
               // DesignToFabrication needs an ISet<ElementId>
               ISet<ElementId> selIds = new HashSet<ElementId>();
               foreach (ElementId id in collection)
               {
                  selIds.Add(id);
               }

               // Set the in-line element type identiers to be swapped during the conversion replacing the family with a similar fabrication part
               IDictionary<ElementId, ElementId> convertInLineIds = new Dictionary<ElementId, ElementId>();

               // Get all family symbols
               FilteredElementCollector familyFinder = new FilteredElementCollector(doc);
               var families = familyFinder.OfClass(typeof(FamilySymbol)).ToElements().ToList();

               // Get the family symbol for the damper we are going to convert
               String fsName = "Fire Damper - Rectangular - Simple";

               // The found family symbol
               FamilySymbol fsDamper = null;
               foreach (FamilySymbol family in families)
               {
                  if (family.FamilyName == fsName)
                  {
                     fsDamper = family;
                     break;
                  }
               }

               // If the damper was found try to find the matching fabrication part type
               if (fsDamper != null)
               {
                  // Get the element type identifier for the family symbol
                  var elemFamSymId = fsDamper.Id;

                  // Get all fabrication part types
                  FilteredElementCollector fabPartTypeFinder = new FilteredElementCollector(doc);
                  var fabPartTypes = fabPartTypeFinder.OfClass(typeof(FabricationPartType)).ToElements().ToList();

                  // Get the fabrication part type for the damper we are going to convert to
                  String fptName = "Rect FD - Flange";

                  // The found fabrication part type
                  FabricationPartType fptDamper = null;
                  foreach (FabricationPartType partType in fabPartTypes)
                  {
                     if (partType.FamilyName == fptName)
                     {
                        fptDamper = partType;
                        break;
                     }
                  }

                  // The damper was found create the mapping in between the family symbol and the matching fabrication part type
                  if (fptDamper != null)
                  {
                     // Get the element type identifier for the fabricaion part type
                     var elemFabPartTypeId = fptDamper.Id;

                     // Create the mapping for the family to the fabrication part
                     convertInLineIds.Add(elemFamSymId, elemFabPartTypeId);
                  }
               }

               using (Transaction tr = new Transaction(doc, "Convert To Fabrication Parts"))
               {
                  tr.Start();

                  FabricationConfiguration config = FabricationConfiguration.GetFabricationConfiguration(doc);

                  // get all loaded fabrication services and attempt to convert the design elements 
                  // to the first loaded service
                  IList<FabricationService> allLoadedServices = config.GetAllLoadedServices();

                  DesignToFabricationConverter converter = new DesignToFabricationConverter(doc);

                  // If there is a mapping defined attempt to add it to the converter
                  if (convertInLineIds.Count() > 0)
                  {
                     // Set the mappings
                     DesignToFabricationMappingResult mappingResult = converter.SetMapForFamilySymbolToFabricationPartType(convertInLineIds);

                     if (mappingResult != DesignToFabricationMappingResult.Success)
                     {
                        if (mappingResult != DesignToFabricationMappingResult.Undefined)
                           message = "There was a problem with the conversion. The map contained no entries.";
                        else if (mappingResult != DesignToFabricationMappingResult.InvalidFamilySymbol)
                           message = "There was a problem with the conversion. There was an invalid Family symbol identifier or an identifier that did not exist in the mappings.";
                        else if (mappingResult != DesignToFabricationMappingResult.InvalidFabricationPartType)
                           message = "There was a problem with the conversion. There was an invalid Fabrication part type identifier or an identifier that did not exist in the mappings.";
                        else if (mappingResult != DesignToFabricationMappingResult.UnsupportedFamilySymbol)
                           message = "There was a problem with the conversion. Unsupported Family symbol it is expected to be either valve, strainer, damper, smoke detector, end cap, or other in line component.";
                        else if (mappingResult != DesignToFabricationMappingResult.UnsupportedFabricationPartType)
                           message = "There was a problem with the conversion. Unsupported Fabrication part type. It is expected to be either valve, strainer, damper, smoke detector, end cap, or other in line component.";
                        return Result.Failed;
                     }
                  }

                  DesignToFabricationConverterResult result = converter.Convert(selIds, allLoadedServices[0].ServiceId);

                  if (result != DesignToFabricationConverterResult.Success)
                  {
                     message = "There was a problem with the conversion.";
                     return Result.Failed;
                  }

                  doc.Regenerate();

                  tr.Commit();
               }

               return Result.Succeeded;
            }
            else
            {
               // inform user they need to select at least one element
               message = "Please select at least one element.";
            }

            return Result.Failed;
         }
         catch (Exception ex)
         {
            message = ex.Message;
            return Result.Failed;
         }
      }
   }
}