using Avalar.Models.Interfaces;
using Avalar.ViewModels.Image;
using Avalar.Views;
using ReactiveUI;
using System;
using System.Linq;

namespace Avalar.Viewmodels.Image
{
    public class ImageViewModel : ReactiveObject
    {
        public ImageViewModel(IImageModel imageModel, IServiceProvider serviceProvider)
        {
            ViewService = serviceProvider?.GetService(typeof(IAvalarViewService)) as IAvalarViewService;
            ImageModel = imageModel;
            ChildViewModel = new ImageNotLoadedViewModel(ReactiveCommand.Create(OpenFile));
        }

        private IAvalarViewService ViewService { get; }

        private IImageModel ImageModel { get; }

        private object m_ChildViewModel;

        public object ChildViewModel
        {
            get => m_ChildViewModel;
            set => this.RaiseAndSetIfChanged(ref m_ChildViewModel, value);
        }

        public async void OpenFile()
        {
            var result = await ViewService.ShowOpenImageFileDialog().ConfigureAwait(true);
            if (result.Length != 1) return;

            ChildViewModel = new ImageLoadedViewModel(ImageModel.LoadImage(result.First()), ImageModel);
        }
    }
}