using Microsoft.Win32;
using PDF_Office.EventAggregators;
using PDF_Office.Views;
using Prism.Commands;
using Prism.Events;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace PDF_Office.ViewModels
{
    public enum LoadType
    {
        /// <summary>
        /// 打开文档
        /// </summary>
        Open,
        /// <summary>
        /// 创建文档
        /// </summary>
        Create
    }
    public class MainContentViewModel : BindableBase, INavigationAware
    {
        private string fileName = "Home";

        public string FileName
        {
            get { return fileName; }
            set { SetProperty(ref fileName, value); }
        }

        private string filePath;

        public string FilePath
        {
            get { return filePath; }
            set
            {
                SetProperty(ref filePath, value);
                if (!string.IsNullOrEmpty(filePath))
                {
                    FileName = System.IO.Path.GetFileName(filePath);
                }

            }
        }

        private Visibility fileChanged;

        public Visibility FileChanged
        {
            get { return fileChanged; }
            set { SetProperty(ref fileChanged, value); }
        }


        public DelegateCommand<object> CloseTab { get; set; }


        private string regionName;

        public string RegionName
        {
            get { return regionName; }
            set { SetProperty(ref regionName, value); }
        }

        public IRegionManager toolregion;

        public IEventAggregator eventer;

        public IContainerProvider container;

        public MainContentViewModel(IRegionManager regionManager, IEventAggregator eventAggregator, IContainerProvider containerProvider)
        {
            toolregion = regionManager;
            eventer = eventAggregator;
            container = containerProvider;

            CloseTab = new DelegateCommand<object>(CloseTabItem);

            RegionName = Guid.NewGuid().ToString();

            System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() =>
            {
                NavigationParameters parameters = new NavigationParameters
                {
                    {
                        "MainViewModel", this
                    }
                };
                toolregion.RequestNavigate(RegionName, "HomeContent", parameters);
            }));
        }


        private void CloseTabItem(object item)
        {
            App.mainWindowViewModel?.CloseTabItem(item);
            App.OpenedFileList.Remove(FilePath);
        }


        public void OpenFile(string filePath)
        {
            FilePath = filePath;
            NavigationParameters parameters = new NavigationParameters { { "MainViewModel", this } };
            System.Windows.Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send, new Action(() =>
            {
                toolregion.RequestNavigate(RegionName, "ViewContent", parameters);
            }));
     
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
            if (navigationContext.Parameters.Count <= 0)
                return;
            var filepath = navigationContext.Parameters["filePath"];
            if(filepath!=null)
            {
                OpenFile(filepath.ToString());
            }
        }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            if (navigationContext.Parameters.Count <= 0)
                return true;
            var isAddTab = navigationContext.Parameters["AddTab"];
            if (isAddTab!=null&&(bool)isAddTab)
            {
                return false;
            }
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {

        }
    }
}