using System;
using System.IO;
using System.Linq;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Essentials;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace PRS.Mobile
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class DocumentPage
    {
        //public static BindableProperty DocumentProperty = BindableProperty.Create(
        //    nameof(Document),
        //    typeof(IDocumentShell),
        //    typeof(DocumentPage));

        //public IDocumentShell Document
        //{
        //    get => (IDocumentShell)GetValue(DocumentProperty);
        //    set
        //    {
        //        SetValue(DocumentProperty, value);
        //        RefreshData(false,true);
        //    }
        //}


        private Guid documentID;
        public Guid DocumentID
        {
            get => documentID;
            set
            {
                documentID = value;
                RefreshData(false, true);
            }
        }

        private DocumentModel _model;


        public DocumentPage()
        {
            _model = new DocumentModel(App.Data,
                () => new Filter<Document>(x => x.ID).IsEqualTo(DocumentID));
            InitializeComponent();
            ProgressVisible = true;
        }
        
        private void RefreshData(bool force, bool async)
        {
            _model.FileName = $"{DocumentID}.document";
            
            if (async)
                _model.Refresh(force, RefreshScreen);
            else
            {
                _model.Refresh(force);
                RefreshScreen();
            }
        }

        private void RefreshScreen()
        {
            var document = _model.FirstOrDefault();
            _viewer.IsVisible = document != null;
            _noviewer.IsVisible = document == null;
            if (document != null)
                _viewer.Load(document.FileName, document.Data);
            Title = document?.FileName ?? "Unknown Document";
            _launch.IsVisible = (document?.FileName?.ToUpper().EndsWith(".PDF")) == true;
        }
        
        private async void _launch_Click(object sender, MobileMenuButtonClickedEventArgs args)
        {
            var document = _model.FirstOrDefault();
            if (document == null)
                return;

            var filePath = CoreRepository.CacheFileName($"{Path.GetFileNameWithoutExtension(document.FileName)}.pdf");
            if (filePath != null)
            {
                try
                {
                    await File.WriteAllBytesAsync(filePath,document.Data);
                }
                catch (Exception e)
                {
                    MobileLogging.Log(e,"PDF Launcher");
                }
                
                await Launcher.OpenAsync(new OpenFileRequest
                {
                    File = new ReadOnlyFile(filePath)
                });
            }
        }

        public event EventHandler DocumentLoaded;

        void _viewer_DocumentLoaded(System.Object sender, System.EventArgs e)
        {
            DocumentLoaded?.Invoke(this, EventArgs.Empty);
        }

        public byte[] GetThumbnail()
        {
            return _viewer.GetThumbnail();
        }

    }
}