using ComPDFKitViewer;
using ComPDFKitViewer.PdfViewer;
using PDF_Office.EventAggregators;
using PDF_Office.Model;
using Prism.Events;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PDF_Office.ViewModels.Scan
{
    class ScanViwerViewModel : BindableBase, INavigationAware
    {
        private CPDFViewer PDFViewer;
        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
            return;
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            navigationContext.Parameters.TryGetValue<CPDFViewer>(ParameterNames.PDFViewer, out PDFViewer);
            if (PDFViewer == null)
            {
                return;
            }
            else
            {
                PDFViewer.InfoChanged += PDFViewer_InfoChanged;
            }
        }

        private void PDFViewer_InfoChanged(object sender, KeyValuePair<string, object> e)
        {
            if (e.Key == "PageNum")
            {
                RenderData renderData = e.Value as RenderData;
                if (renderData != null)
                {
                    var CurrentPage = renderData.PageIndex;
                }
            }
        }

        public ScanViwerViewModel(IEventAggregator eventAggregator)
        {
            eventAggregator.GetEvent<ScanEvent>().Subscribe(ChangeScanMode, e => e.Unicode == App.mainWindowViewModel.SelectedItem.Unicode);
        }
        /// <summary>
        /// 根据Vm事件通知处理OCR与区域识别事件
        /// </summary>
        /// <param name="e"></param>
        private void ChangeScanMode(ScanEventArgs e)
        {
            switch (e.Mode)
            {
                case ScanMode.Unknown:
                    break;
                case ScanMode.OCR:
                    break;
                case ScanMode.Area:
                    break;
                default:
                    break;
            }
        }

    }
}