using DTS.Common.Base;
using DTS.Common.Events;
using DTS.Common.Interface;
using System;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using C1.WPF.Pdf;
using System.Windows;
using System.Windows.Media.Imaging;
using System.Windows.Media;
using DTS.Common.Utilities.Logging;
using Prism.Events;
using Prism.Ioc;
// ReSharper disable CheckNamespace
namespace DTS.Viewer
{
    /// <summary>
    /// Interaction logic for ViewerMainViewGrid.xaml
    /// </summary>
    public partial class ExportMainViewGrid : IExportMainViewGrid
    {

        public ExportMainViewGrid()
        {
            InitializeComponent();
            Loaded += ExportMainViewGrid_Loaded;
        }

        private IEventAggregator _eventAggregator { get; set; }
        private void SetFocus()
        {
        }
        //FB 14797 Subscribe to event after the page loaded to make sure eventAggregator is available
        private void ExportMainViewGrid_Loaded(object sender, System.Windows.RoutedEventArgs e)
        {
            _eventAggregator = ContainerLocator.Container.Resolve<IEventAggregator>();
            _eventAggregator?.GetEvent<GraphLoadedCountNotification>().Subscribe(OnGraphLoadedCountNotification);
        }

        //FB 14797 Set the focus to first tab (chartOptTab) after the graph is fully loaded (3 sec) 
        private void OnGraphLoadedCountNotification(GraphLoadedCountNotificationArg arg)
        {
            if (null != DataContext && (IBaseViewModel)DataContext != arg.ParentVM) return;
            Task.Run(() =>
            {
                Thread.Sleep(TimeSpan.FromSeconds(3));
                Dispatcher.BeginInvoke((System.Action)SetFocus);
            });
        }
        /// <summary>
        /// Returns > 0 if successful, < 0 if failure, or 0 if the MainChart is not ready yet
        /// </summary>
        /// <param name="directory"></param>
        /// <param name="pdfFileName"></param>
        /// <returns></returns>
        public int SaveToPDF(string directory, string pdfFileName)
        {
            try
            {
                //FB 29493 Error message in log before success message
                if (MainShell.DesiredSize.Height == 0 || MainShell.DesiredSize.Width == 0) return 0;
                if (string.IsNullOrEmpty(directory) || string.IsNullOrEmpty(pdfFileName) || !pdfFileName.EndsWith(".pdf")) return -1;
                var bounds = VisualTreeHelper.GetDescendantBounds(MainShell);
                // desired resolution:
                double dpiX = 300, dpiY = 300;
                var bmp = new RenderTargetBitmap((int)(bounds.Width * dpiX / 96.0), (int)(bounds.Height * dpiY / 96.0), dpiX, dpiY, PixelFormats.Pbgra32);
                bmp.Render(MainShell);
                var wBmp = new WriteableBitmap(bmp);

                var pdf = new C1PdfDocument
                {
                    Landscape = true,
                    PageSize = new Size(MainShell.ActualWidth, MainShell.ActualHeight)
                };
                pdf.DrawImage(wBmp, new Rect(0, 0, MainShell.ActualWidth, MainShell.ActualHeight));
                pdf.Save(Path.Combine(directory, pdfFileName));

                DTS.Common.Utils.PNGImageUtil.SaveImage(MainShell, System.IO.Path.Combine(directory, pdfFileName.Replace(".pdf", ".png")));
                return 1;
            }
            catch (Exception ex)
            {
                APILogger.LogException(ex);
            }
            return -1;
        }
    }
}