using CommonServiceLocator;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Ioc;
using StandardDesign.DataAccess;
using StandardDesign.IDataAccess;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StandardDesign.ViewModels
{
    public class ViewModelLocator
    {
        public ViewModelLocator()
        {
            //管理对象的生命周期
            ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);

            //注册ioc容器
            SimpleIoc.Default.Register<LoginViewModel>();
            SimpleIoc.Default.Register<MainViewModel>();

            SimpleIoc.Default.Register<ILoacalDataAccess, LoacalDataAccess>();
        }
        // 这种属性定义方式会有歧义，感觉好像定义的字段
        public LoginViewModel LoginViewModel => ServiceLocator.Current.GetInstance<LoginViewModel>();
        public MainViewModel MainViewModel => ServiceLocator.Current.GetInstance<MainViewModel>();



        /// <summary>
        /// 通过ViewModelLocator对象实例 进行对应的VM对象的销毁
        /// </summary>
        /// <typeparam name="T"></typeparam>
        public static void Cleanup<T>() where T : ViewModelBase
        {
            if (SimpleIoc.Default.IsRegistered<T>() && SimpleIoc.Default.ContainsCreated<T>())
            {
                var instances = SimpleIoc.Default.GetAllCreatedInstances<T>();
                foreach (var instance in instances)
                {
                    instance.Cleanup();
                }
                SimpleIoc.Default.Unregister<T>();
                SimpleIoc.Default.Register<T>();
            }
        }
    }
}