using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using RView = Autodesk.Revit.DB.View;
using RApplication = Autodesk.Revit.ApplicationServices.Application;

namespace Revit.SDK.Samples.UIAPI.CS
{
    public partial class PreviewModel : System.Windows.Forms.Form
    {
        public PreviewModel(RApplication application, ElementId viewId)
        {
            InitializeComponent();
            _application = application;
            _uiApplication = new UIApplication(application);
            _dbDocument = _uiApplication.ActiveUIDocument.Document;

            updateDocumentList(_dbDocument);
            updateViewsList(_uiApplication.ActiveUIDocument.ActiveView.Id);
        }

        private void updateViewsList(ElementId viewId)
        {
            // fill the combobox with printable views <name + id>
            FilteredElementCollector collecotr = new FilteredElementCollector(_dbDocument);
            collecotr.OfClass(typeof(Autodesk.Revit.DB.View));
            IEnumerable<Autodesk.Revit.DB.View> secs = from Element f in collecotr where (f as Autodesk.Revit.DB.View).CanBePrinted == true select f as Autodesk.Revit.DB.View;
            _cbViews.Items.Clear();
            DBViewItem activeItem = null;
            foreach (Autodesk.Revit.DB.View dbView in secs)
            {
                if (viewId == null || viewId.IntegerValue < 0)
                {
                    activeItem = new DBViewItem(dbView, _dbDocument);
                    viewId = dbView.Id;
                }
                if (dbView.Id == viewId)
                {
                    activeItem = new DBViewItem(dbView, _dbDocument);
                    _cbViews.Items.Add(activeItem);
                }
                else
                    _cbViews.Items.Add(new DBViewItem(dbView, _dbDocument));
            }
            _cbViews.SelectedItem = activeItem;
        }

        private void updateDocumentList(Document selectedDocument)
        {
            // fill the documents to the comboxbox _cbDocuments.
            DBDocumentItem activeItem = null;
            _cbDocuments.Items.Clear();
            DocumentSetIterator docIter = _application.Documents.ForwardIterator();
            docIter.Reset();
            while (docIter.MoveNext())
            {
                Document dbDoc = docIter.Current as Document;
                String documentName = null;
                DBDocumentItem item = null;
                if (dbDoc != null)
                {
                    if (dbDoc.IsFamilyDocument)
                    {
                        item = new DBDocumentItem(dbDoc.PathName, dbDoc);
                    }
                    else
                    {
                        String projName = dbDoc.ProjectInformation.Name;
                        if (String.IsNullOrEmpty(projName) || projName.ToLower().CompareTo("project name") == 0)
                        {
                            if (String.IsNullOrEmpty(dbDoc.PathName))
                                documentName = projName;
                            else
                                documentName = new System.IO.FileInfo(dbDoc.PathName).Name;
                        }
                        else
                            documentName = projName;

                        item = new DBDocumentItem(documentName, dbDoc);

                    }
                    if (dbDoc.Equals(selectedDocument))
                    {
                        _dbDocument = selectedDocument;
                        activeItem = item;
                    }
                    _cbDocuments.Items.Add(item);
                }
            }
            _cbDocuments.Items.Add(new DBDocumentItem());
            _cbDocuments.SelectedItem = activeItem;
        }

        private void cbViews_SelIdxChanged(object sender, EventArgs e)
        {
            System.Windows.Forms.ComboBox cb = sender as System.Windows.Forms.ComboBox;
            if (cb == null)
                return;

            DBViewItem dbItem = cb.SelectedItem as DBViewItem;
            if (dbItem == null)
                return;

            //if (_currentDBViewId == null)
            //    return;

            //RView currentView = _dbDocument.get_Element(_currentDBViewId) as RView;
            //if(currentView == null)
            //    return;

            //if (dbItem.UniqueId.ToLower().CompareTo(currentView.UniqueId.ToLower()) != 0)
            //    return;

            PreviewControl vc = _elementHostWPF.Child as PreviewControl;
            if (vc != null)
                vc.Dispose();
            _elementHostWPF.Child = new PreviewControl(_dbDocument, dbItem.Id);
            _currentDBViewId = dbItem.Id;
        }


        private ElementId _currentDBViewId = null;
        private Document _dbDocument = null;
        private RApplication _application = null;
        private UIApplication _uiApplication = null;

        private void cbDocs_SelIdxChanged(object sender, EventArgs e)
        {
            DBDocumentItem documentItem = _cbDocuments.SelectedItem as DBDocumentItem;
            if (documentItem.Document == _dbDocument)
                return;

            if (documentItem.IsNull)
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.DefaultExt = "rvt";
                ofd.Filter = "Revit project files (*.rvt)|*.rvt|Revit family files (*.rfa)|*.rfa|Revit family template files (*.rft)|*.rft";
                if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    try
                    {
                        _dbDocument = _application.OpenDocumentFile(ofd.FileName);
                    }
                    catch (System.Exception)
                    {

                    }
                    if (_dbDocument != null)
                    {
                        updateDocumentList(_dbDocument);
                        updateViewsList(null);
                    }
                }
                else
                {
                    // the combobox should show the current document item.
                    String documentName;
                    String projName = _dbDocument.ProjectInformation.Name;
                    if (String.IsNullOrEmpty(projName) || projName.ToLower().CompareTo("project name") == 0)
                    {
                        if (String.IsNullOrEmpty(_dbDocument.PathName))
                            documentName = projName;
                        else
                            documentName = new System.IO.FileInfo(_dbDocument.PathName).Name;
                    }
                    else
                        documentName = projName;

                    foreach (DBDocumentItem dbItem in _cbDocuments.Items)
                    {
                        if (dbItem.Name.ToLower().CompareTo(documentName.ToLower()) == 0)
                        {
                            _cbDocuments.SelectedItem = dbItem;
                            break;
                        }
                    }
                }
            }
            else
            {
                _dbDocument = documentItem.Document;
                updateViewsList(null);
            }


        }
    }


    public class DBViewItem
    {
        public DBViewItem(RView dbView, Document dbDoc)
        {
            ElementType viewType = dbDoc.GetElement(dbView.GetTypeId()) as ElementType;
            Name = viewType.Name + " " + dbView.Name;
            Id = dbView.Id;
            UniqueId = dbView.UniqueId;
        }

        public override String ToString()
        {
            return Name;
        }

        public String Name { get; set; }

        public ElementId Id { get; set; }

        public String UniqueId { get; set; }
    }


    public class DBDocumentItem
    {
        public DBDocumentItem(String name, Document doc)
        {
            Name = name;
            Document = doc;
            IsNull = false;
        }

        public DBDocumentItem()
        {
            IsNull = true;
        }

        public override string ToString()
        {
            if (IsNull)
                return "<Open Document...>";
            return Name;
        }

        public bool IsNull { get; set; }
        public String Name { get; set; }
        public Document Document { get; set; }
    }

}