namespace Utils.Basis.ViewModel
{
    using Autodesk.Revit.DB;
    using Utils.Basis;
    using System;
    using System.ComponentModel;

    public class ProgressViewModel : ViewModelBase
    {
        private BackgroundWorker _backgroundWorker = new BackgroundWorker();
        private bool _canceled;
        private DelegateCommand _cancelProcess;
        private int _count;
        private ProgressViewModel.DoWorkDelegate _doWorkDelegate;
        private int _maxCount = 100;
        private bool _progressBarActive;
        private Transaction _transaction;
        private string _windowTitle = "Selecting Elements";

        public ProgressViewModel(ProgressViewModel.DoWorkDelegate doWorkDelegate)
        {
            this._doWorkDelegate = doWorkDelegate;
            this._backgroundWorker.DoWork += this._backgroundWorker_DoWork;
            this._backgroundWorker.RunWorkerCompleted += this._backgroundWorker_RunWorkerCompleted;
            this._backgroundWorker.WorkerSupportsCancellation = true;
            this._cancelProcess = new DelegateCommand(new Action(this.Cancel));
        }

        public delegate void DoWorkDelegate();

        public bool Canceled
        {
            get
            {
                return this._canceled;
            }
            set
            {
                this._canceled = value;
            }
        }

        public DelegateCommand CancelProcess
        {
            get
            {
                return this._cancelProcess;
            }
        }

        public int Count
        {
            get
            {
                return this._count;
            }
            set
            {
                this._count = value;
            }
        }

        public int IntPercentage
        {
            get
            {
                int result;
                try
                {
                    result = Convert.ToInt32(Math.Round((double)this.Count / (double)this.MaxCount * 100.0, 1));
                }
                catch
                {
                    result = 0;
                }
                return result;
            }
        }

        public bool IsBusy { get; set; }

        public int MaxCount
        {
            get
            {
                return this._maxCount;
            }
            set
            {
                this._maxCount = value;
            }
        }

        public bool ProgressBarActive
        {
            get
            {
                return this._progressBarActive;
            }
            set
            {
                this._progressBarActive = value;
            }
        }

        public ProgressViewModel.DoWorkDelegate SetDelegate
        {
            set
            {
                this._doWorkDelegate = value;
            }
        }

        public string StringPercentage
        {
            get
            {
                return this.IntPercentage.ToString() + "%";
            }
        }

        public Transaction Transaction
        {
            get
            {
                return this._transaction;
            }
            set
            {
                this._transaction = value;
            }
        }

        public string WindowTitle
        {
            get
            {
                return this._windowTitle;
            }
            set
            {
                this._windowTitle = value;
            }
        }

        public void Cancel()
        {
            this.Canceled = true;
            this.IsBusy = false;
            this._backgroundWorker.CancelAsync();
            if (this._transaction != null)
            {
                this._transaction.Dispose();
            }
        }

        public void RunWorker()
        {
            this._backgroundWorker.RunWorkerAsync();
        }

        private void _backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            this._doWorkDelegate();
        }

        private void _backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.IsBusy = false;
        }
    }
}