//
// (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.
//
namespace Revit.SDK.Samples.ObjectViewer.CS
{
    using System;
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.ComponentModel;

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

    using Element = Autodesk.Revit.DB.Element;
    using GeometryElement = Autodesk.Revit.DB.GeometryElement;

    /// <summary>
    /// main command class of the ObjectViewer application
    /// </summary>
    public class ObjectViewer
    {
        /// <summary>
        /// choose the display kinds of preview
        /// </summary>
        public enum DisplayKinds
        {
            /// <summary>
            /// Geometry Model
            /// </summary>
            GeometryModel,

            /// <summary>
            /// AnalyticalModel
            /// </summary>
            AnalyticalModel
        }

        private Element m_selected;     // selected element to display
        private View m_currentView;     // current View for preview
        // current detail level for preview
        private ViewDetailLevel m_detailLevel = ViewDetailLevel.Fine;
        private List<View> m_allViews = new List<View>();   // all Views in current project
        // current display kind for preview
        private DisplayKinds m_displayKind = DisplayKinds.GeometryModel;
        // selected element's parameters' data
        private SortableBindingList<Para> m_paras;
        // current sketch instance to draw the element
        private Sketch3D m_currentSketch3D = null;
        // indicate whether select view or detail
        private bool m_isSelectView = true;

        /// <summary>
        /// Current display kind for preview
        /// </summary>
        public DisplayKinds DisplayKind
        {
            get
            {
                return m_displayKind;
            }
            set
            {
                m_displayKind = value;
                UpdateSketch3D();
            }
        }

        /// <summary>
        /// Current View for preview
        /// </summary>
        public View CurrentView
        {
            get
            {
                return m_currentView;
            }
            set
            {
                m_currentView = value;
                m_isSelectView = true;
                UpdateSketch3D();
            }
        }

        /// <summary>
        /// All Views in current project
        /// </summary>
        public ReadOnlyCollection<View> AllViews
        {
            get
            {
                return new ReadOnlyCollection<View>(m_allViews);
            }
        }

        /// <summary>
        /// Current detail level for preview
        /// </summary>
        public ViewDetailLevel DetailLevel
        {
            get
            {
                return m_detailLevel;
            }
            set
            {
                m_detailLevel = value;
                m_isSelectView = false;
                UpdateSketch3D();
            }
        }

        /// <summary>
        /// Current sketch instance to draw the element
        /// </summary>
        public Sketch3D CurrentSketch3D
        {
            get
            {
                return m_currentSketch3D;
            }
        }

        /// <summary>
        /// Selected element's parameters' data
        /// </summary>
        public SortableBindingList<Para> Params
        {
            get
            {
                return m_paras;
            }
        }

        /// <summary>
        /// constructor
        /// </summary>
        public ObjectViewer()
        {
            UIDocument doc = Command.CommandData.Application.ActiveUIDocument;
            ElementSet selection = new ElementSet();
            foreach (ElementId elementId in doc.Selection.GetElementIds())
            {
               selection.Insert(doc.Document.GetElement(elementId));
            }
            // only one element should be selected
            if (0 == selection.Size)
            {
                throw new ErrorMessageException("Please select an element.");
            }

            if (1 < selection.Size)
            {
                throw new ErrorMessageException("Please select only one element.");
            }
            // get selected element
            foreach (Element e in selection)
            {
                m_selected = e;
            }
            // get current view and all views
            m_currentView = doc.Document.ActiveView;
            FilteredElementIterator itor = (new FilteredElementCollector(doc.Document)).OfClass(typeof(View)).GetElementIterator();
            itor.Reset();
            while (itor.MoveNext())
            {
                View view = itor.Current as View;
                // Skip view templates because they're invisible in project browser, invalid for geometry elements
                if (null != view && !view.IsTemplate)
                {
                    m_allViews.Add(view);
                }
            }

            // create a instance of Sketch3D
            GeometryData geomFactory = new GeometryData(m_selected, m_currentView);
            m_currentSketch3D = new Sketch3D(geomFactory.Data3D, Graphics2DData.Empty);

            //get a instance of ParametersFactory and then use it to create Parameters
            ParasFactory parasFactory = new ParasFactory(m_selected);
            m_paras = parasFactory.CreateParas();
        }

        /// <summary>
        /// update current Sketch3D using current UCS and settings
        /// </summary>
        private void UpdateSketch3D()
        {
            if (m_displayKind == DisplayKinds.GeometryModel)
            {
                GeometryData geomFactory;
                if(m_isSelectView)
                {
                    geomFactory = new GeometryData(m_selected, m_currentView);
                    m_detailLevel = ViewDetailLevel.Undefined;

                }
                else
                {
                    geomFactory = new GeometryData(m_selected, m_detailLevel, m_currentView);
                }

                Graphics3DData geom3DData = geomFactory.Data3D;
                Graphics3DData old3DData = m_currentSketch3D.Data3D;
                geom3DData.CurrentUCS = old3DData.CurrentUCS;
                m_currentSketch3D.Data3D = geom3DData;
                m_currentSketch3D.Data2D = Graphics2DData.Empty;
            }
            else if (m_displayKind == DisplayKinds.AnalyticalModel)
            {
                ModelData modelFactory = new ModelData(m_selected);
                Graphics3DData model3DData = modelFactory.Data3D;
                Graphics2DData model2DData = modelFactory.Data2D;
                Graphics3DData old3DData = m_currentSketch3D.Data3D;
                model3DData.CurrentUCS = old3DData.CurrentUCS;
                m_currentSketch3D.Data3D = model3DData;
                m_currentSketch3D.Data2D = model2DData;
            }
        }
    }
}