using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Comal.Classes;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace PRS.Mobile
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class DocScannerModule
    {
        private DataEntryTagModel _tags;
        private DataEntryDocumentModel _dataEntriesDocument;
        
        public DocScannerModule()
        {
            _dataEntriesDocument = new DataEntryDocumentModel(App.Data,
                () => new Filter<DataEntryDocument>(x => x.Employee.ID).IsEqualTo(App.Data.Me.ID)
                    .And(x => x.Archived).IsEqualTo(DateTime.MinValue)
            ) { FileName = "scans.data" };
            _tags = new DataEntryTagModel(App.Data, null) { FileName = "scantags.data" };
            
            InitializeComponent();
            ProgressVisible = true;
            RefreshData(false, true);
        }

        private void RefreshData(bool force, bool async)
        {
            _dataEntriesDocument.Refresh(force);
            
            Task[] tasks = new Task[]
            {
                //Task.Run(() => _dataEntriesDocument.Refresh(force)),
                Task.Run(() => _tags.Refresh(force))
            };
            if (async)
                Task.WhenAll(tasks).ContinueWith((_) => Device.BeginInvokeOnMainThread(RefreshScreen));
            else
            {
                Task.WaitAll(tasks);
                RefreshScreen();
            }
        }

        private void RefreshScreen()
        {
            ProgressVisible = false;
            _documents.ItemsSource = null;
            _documents.ItemsSource = _dataEntriesDocument;
        }

        private async Task<bool> ConfirmScan(DataEntryDocumentShell documentShell)
        {
            documentShell.EmployeeID = App.Data.Me.ID;
            if (!_tags.Any()) 
                return true;

            var tag = await DisplayActionSheet("Select Tag", "Cancel", null, _tags.Items.Select(x => x.Name).ToArray());
            documentShell.TagID = _tags.Items.FirstOrDefault(x => String.Equals(x.Name, tag))?.ID ?? Guid.Empty;
            
            return !string.Equals(tag,"Cancel");
        }

        private async void TakePhoto_Clicked(object sender, EventArgs e)
        {
            await _documents.AddImage<MobileDocumentCameraSource, MobileDocumentCameraOptions,DataEntryDocumentShell>(
                PhotoUtils.CreateCameraOptions(), 
                ConfirmScan);
        }

        private async void BrowseLibrary_Clicked(object sender, EventArgs e)
        {
            await _documents.AddImage<MobileDocumentPhotoLibrarySource,MobileDocumentPhotoLibraryOptions,DataEntryDocumentShell>(
                PhotoUtils.CreatePhotoLibraryOptions(), 
                ConfirmScan);
        }

        private void _documents_OnRefreshRequested(object sender, MobileListRefreshEventArgs args)
        {
            RefreshData(true,false);
        }
    }
}