using MahApps.Metro.Controls;
using Prism.Commands;
using Prism.Events;
using Prism.Ioc;
using Prism.Mvvm;
using Prism.Regions;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using TeamAAS_VP.Core;
using TeamAAS_VP.Events;
using TeamAAS_VP.Interfaces;
using TeamAAS_VP.Models;
using TeamAAS_VP.Models.Product;
using TeamAAS_VP.Services;

namespace TeamAAS_VP.ViewModels
{
    public class ProductsViewModel : BindableBase, IConfirmNavigationRequest
    {
        IRegionManager _regionManager;
        IEventAggregator _eventAggregator;
        IContainerProvider _container;
        IDialogService _dialogService;
        IProductService _productService;
        #region 属性

        #endregion

        #region 命令
        private DelegateCommand _LoadedCommand;
        public DelegateCommand LoadedCommand =>
            _LoadedCommand ?? (_LoadedCommand = new DelegateCommand(ExecuteLoadedCommand));

        
        #endregion

        #region 事件

        #endregion

        public ProductsViewModel(IRegionManager regionManager, IEventAggregator ea, IContainerProvider container, IDialogService dialogService,
            IProductService productService)
        {
            _regionManager = regionManager;
            _eventAggregator = ea;
            _container = container;
            _dialogService = dialogService;
            _productService = productService;
            
            //订阅权限登录事件
            _eventAggregator.GetEvent<UserLoginNotification>().Subscribe(LoginChange);
        }

        #region 方法
        bool isFirstShow = false;
        void ExecuteLoadedCommand()
        {
            if (!isFirstShow)
            {
                _regionManager.RequestNavigate("ProductRegionContext", "ProductHome");
                isFirstShow = true;
            }
        }
        #endregion

        #region 继承
        /// <summary>
        /// 确认导航请求时调用。此方法允许您在导航之前执行一些操作。
        /// </summary>
        /// <param name="navigationContext"></param>
        /// <param name="continuationCallback"></param>
        public void ConfirmNavigationRequest(NavigationContext navigationContext, Action<bool> continuationCallback)
        {
            continuationCallback(true);
        }

        /// <summary>
        /// 接收导航请求时调用。传入导航参数，包含有关导航目标的信息。
        /// </summary>
        /// <param name="navigationContext"></param>
        /// <exception cref="NotImplementedException"></exception>
        public async void OnNavigatedTo(NavigationContext navigationContext)
        {
            
        }

        /// <summary>
        /// 是否允许导航到此视图模型。
        /// </summary>
        /// <param name="navigationContext"></param>
        /// <returns></returns>
        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        /// <summary>
        /// 导航离开此视图模型时调用。您可以在此处执行清理操作或保存状态。
        /// </summary>
        /// <param name="navigationContext"></param>
        public void OnNavigatedFrom(NavigationContext navigationContext)
        {

        }
        #endregion

        private void LoginChange(Models.User user)
        {

        }
    }
}