using System;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using InABox.Mobile;
using Xamarin.Forms;
using Xamarin.Forms.Shapes;
using Xamarin.Forms.Xaml;
using Xamarin.Forms.Xaml.Internals;
using XF.Material.Forms.UI.Dialogs;

namespace PRS.Mobile
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class DocumentList
    {
        
        public static readonly BindableProperty ItemsSourceProperty = BindableProperty.Create(
            nameof(ItemsSource),
            typeof(ICoreRepository),
            typeof(DocumentList)
        );
        //
        // private static void ItemsSourceChanged(BindableObject bindable, object oldvalue, object newvalue)
        // {
        //     if ((bindable is DocumentList list) && newvalue is ICoreRepository repository)
        //     {
        //         list.ItemsSource = null;
        //         list.ItemsSource = repository;
        //         list._imagelist.ItemsSource = repository?.Items;
        //         list._imagelist.LastUpdated = repository?.LastUpdated ?? DateTime.MinValue;
        //     }
        // }

        public ICoreRepository? ItemsSource
        {
            get => GetValue(ItemsSourceProperty) as ICoreRepository;
            set
            {
                SetValue(ItemsSourceProperty, value);
                _imagelist.ItemsSource = value?.Items;
                _imagelist.LastUpdated = value?.LastUpdated ?? DateTime.MinValue;
            }
        }
        
        public Guid ParentID { get; set; }

        public event MobileListRefreshEvent RefreshRequested;

        public bool PullToRefresh
        {
            get => _imagelist.PullToRefresh;
            set => _imagelist.PullToRefresh = value;
        }

        public bool ShowRecordCount
        {
            get => _imagelist.ShowRecordCount;
            set => _imagelist.ShowRecordCount = value;
        }
        
        public string EmptyText
        {
            get => _imagelist.EmptyText;
            set => _imagelist.EmptyText = value;
        }
        
        public DocumentList()
        {
            InitializeComponent();
        }

        private void Image_Clicked(object sender, EventArgs e)
        {
            if ((sender as MobileCard)?.BindingContext is IEntityDocumentShell eds && eds.DocumentID != Guid.Empty)
            {
                
                DocumentPage docviewer = new DocumentPage();
                docviewer.DocumentLoaded += (o, e) =>
                {
                    if ((sender as MobileCard)?.BindingContext is IEntityDocumentShell eds && (eds.Thumbnail?.Any() != true))
                    {
                        eds.Thumbnail = docviewer.GetThumbnail();
                        eds.Save("Thumbnail Updated on Mobile Device");
                    }
                };
                docviewer.DocumentID = eds.DocumentID;
                Navigation.PushAsync(docviewer);
               
            }

        }

        public async Task<bool> AddImage<T, TOptions, TShell>(TOptions options, Func<TShell, Task<bool>> customiseshell = null) 
            where T : MobileDocumentSource
            where TOptions : MobileImageOptions<T>
            where TShell : class, IEntityDocumentShell
        {
            
            MobileDocument file = null;
            try
            {
                file = await MobileDocument.From(options);
            }
            
            catch (Exception e)
            {
                await MaterialDialog.Instance.AlertAsync(e.Message, "ERROR");
            }
            
            if (file?.Data?.Any() == true)
            {
                var ext = System.IO.Path.GetExtension(file.FileName);
                file.FileName = System.IO.Path.ChangeExtension(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), ext);
                var shell = ItemsSource.AddItem() as TShell;
                shell.ParentID = ParentID;
                
                bool confirm = (customiseshell == null) 
                    || await customiseshell.Invoke(shell);
                
                if (confirm)
                {
                    using (await MaterialDialog.Instance.LoadingDialogAsync("Saving Image"))
                    {

                        shell.Thumbnail = MobileUtils.ImageTools.CreateThumbnail(file.Data, 256, 256);

                        shell.FileName = file.FileName;

                        var docshell = EntityDocumentUtils.SaveDocument<TShell>(
                            file,
                            () => shell,
                            "Created on Mobile Device"
                        );
                        Device.BeginInvokeOnMainThread(() =>
                        {
                            ItemsSource.Search();
                            _imagelist.ItemsSource = null;
                            _imagelist.ItemsSource = ItemsSource.Items;
                        });
                        return true;
                    }
                }

            }

            return false;


        }

        private void _imagelist_OnRefreshRequested(object sender, MobileListRefreshEventArgs args)
        {
            RefreshRequested?.Invoke(this,args);
        }
    }
}