//
// (C) Copyright 2003-2019 by Autodesk, Inc. 
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
// that both that copyright notice and the limited warranty and
// restricted rights notice below appear in all supporting
// documentation.
//
// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable. 
//


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

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

namespace Revit.SDK.Samples.LevelsProperty.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)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Command : IExternalCommand
    {
        #region GetDatum

        /// <summary>
        /// Implement this method as an external command for Revit.
        /// </summary>
        /// <param name="revit">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 Autodesk.Revit.UI.Result Execute(ExternalCommandData revit, ref String message, Autodesk.Revit.DB.ElementSet elements)
        {
            m_revit = revit;
            UnitTypeId = m_revit.Application.ActiveUIDocument.Document.GetUnits().GetFormatOptions(Autodesk.Revit.DB.SpecTypeId.Length).GetUnitTypeId();
            Transaction documentTransaction = new Transaction(revit.Application.ActiveUIDocument.Document, "Document");
            documentTransaction.Start();
            try
            {
                //Get every level by iterating through all elements
                systemLevelsDatum = new List<LevelsDataSource>();
                FilteredElementCollector collector = new FilteredElementCollector(m_revit.Application.ActiveUIDocument.Document);
                ICollection<Element> collection = collector.OfClass(typeof(Level)).ToElements();
                foreach (Element element in collection)
                {
                     Level systemLevel = element as Level;
                     LevelsDataSource levelsDataSourceRow = new LevelsDataSource();

                     levelsDataSourceRow.LevelIDValue = systemLevel.Id.IntegerValue;
                     levelsDataSourceRow.Name = systemLevel.Name;

                     Parameter elevationPara = systemLevel.get_Parameter(BuiltInParameter.LEVEL_ELEV);
                     
                     double temValue = Unit.CovertFromAPI(UnitTypeId, elevationPara.AsDouble());
                     double temValue2 = double.Parse(temValue.ToString("#.0"));
                     
                     levelsDataSourceRow.Elevation = temValue2;

                     systemLevelsDatum.Add(levelsDataSourceRow);
                }

                using (LevelsForm displayForm = new LevelsForm(this))
                {
                    displayForm.ShowDialog();
                }
            }
            catch (Exception ex)
            {
                message = ex.Message;
                documentTransaction.RollBack();
                return Autodesk.Revit.UI.Result.Failed;
            }
            documentTransaction.Commit();
            return Autodesk.Revit.UI.Result.Succeeded;
        }

        ExternalCommandData m_revit;
        public Autodesk.Revit.DB.ForgeTypeId UnitTypeId;
        System.Collections.Generic.List<LevelsDataSource> systemLevelsDatum;
        /// <summary>
        /// Store all levels' datum in system
        /// </summary>
        public System.Collections.Generic.List<LevelsDataSource> SystemLevelsDatum
        {
            get
            {
                return systemLevelsDatum;
            }
            set
            {
                systemLevelsDatum = value;
            }
        }
        #endregion

        #region SetData


        /// <summary>
        /// Set Level
        /// </summary>
        /// <param name="levelIDValue">Pass a Level's ID value</param>
        /// <param name="levelName">Pass a Level's Name</param>
        /// <param name="levelElevation">Pass a Level's Elevation</param>
        /// <returns>True if succeed, else return false</returns>
        public bool SetLevel(int levelIDValue, String levelName, double levelElevation)
        {
            try
            {
                Autodesk.Revit.DB.ElementId levelID = new Autodesk.Revit.DB.ElementId(levelIDValue);
                Level systemLevel = m_revit.Application.ActiveUIDocument.Document.GetElement(levelID) as Level;

                Parameter elevationPara = systemLevel.get_Parameter(BuiltInParameter.LEVEL_ELEV);
                elevationPara.SetValueString(levelElevation.ToString());
                systemLevel.Name = levelName;

                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
        #endregion

        #region CreateLevel
        /// <summary>
        /// Create a level
        /// </summary>
        /// <param name="levelName">Pass a Level's Name</param>
        /// <param name="levelElevation">Pass a Level's Elevation</param>
        public void CreateLevel(String levelName, double levelElevation)
        {
           Level newLevel = Level.Create(m_revit.Application.ActiveUIDocument.Document, levelElevation);
            Parameter elevationPara = newLevel.get_Parameter(BuiltInParameter.LEVEL_ELEV);
            elevationPara.SetValueString(levelElevation.ToString());

            newLevel.Name = levelName;
        }
        #endregion

        #region DeleteLevel
        /// <summary>
        /// Delete a Level.
        /// </summary>
        /// <param name="IDValueOfLevel">A Level's ID value</param>
        public void DeleteLevel(int IDValueOfLevel)
        {
            Autodesk.Revit.DB.ElementId IDOfLevel = new ElementId(IDValueOfLevel);

            m_revit.Application.ActiveUIDocument.Document.Delete(IDOfLevel);
        }
        #endregion
    }
}