using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Comal.Classes;
using Comal.Classes.SecurityDescriptors;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Essentials;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using XF.Material.Forms.UI.Dialogs;
using Result = ZXing.Result;

namespace PRS.Mobile
{

    public class QuickPickViewModel : BindableObject
    {
        public bool HasItems { get; set; }
        public StockHoldingModel Holdings { get; private set; }
        public RequisitionItemModel RequisitionItems { get; private set; }
        
        public JobShell Job { get; set; }
        
        public QuickPickViewModel()
        {
            Holdings = new StockHoldingModel(App.Data, () => new Filter<StockHolding>().None());
            RequisitionItems = new RequisitionItemModel(App.Data, () => new Filter<RequisitionItem>().None());
            Job = App.Data.Jobs.CreateItem();
        }
    }
    
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class QuickPickModule : MobilePage
    {
        public QuickPickModule()
        {
            InitializeComponent();
            var options = new ZXing.Mobile.MobileBarcodeScanningOptions()
            {
                PossibleFormats = new List<ZXing.BarcodeFormat>() { ZXing.BarcodeFormat.QR_CODE },
                AutoRotate = false,
                TryInverted = true,
                TryHarder = true,
            };
            _scanView.Options = options;
            _scanView.IsAnalyzing = false;
            _scanView.IsScanning = true;
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            try
            {
                _scanView.IsAnalyzing = _tabStrip.SelectedIndex == 0;
            }
            catch (Exception e)
            {
                InABox.Mobile.MobileLogging.Log(e);
            }
        }
        
        protected override void OnDisappearing()
        {
            
            try
            {
                _scanView.IsAnalyzing = false;
            }
            catch (Exception e)
            {
                InABox.Mobile.MobileLogging.Log(e);
            }
            base.OnDisappearing();
        }
        
        private void _tabStrip_OnSelectionChanged(object sender, EventArgs e)
        {
            _scanView.IsAnalyzing = _tabStrip.SelectedIndex == 0;
            _viewModel.HasItems = _viewModel.RequisitionItems.Any();
        }
        
        private bool bProcessing = false;
        private Guid _lastGuid = Guid.Empty;
        private async void ScanView_OnScanResult(ZXing.Result result)
        {
            if (bProcessing)
                return;

            if (!Guid.TryParse(result.Text, out Guid id) || id == Guid.Empty || id == _lastGuid)
                return;

            _lastGuid = id;
            
            bProcessing = true;
            using (await MaterialDialog.Instance.LoadingDialogAsync($"Processing..."))
            {
                Vibration.Vibrate();
                SearchLocationID(id);
                bProcessing = false;
            }

        }

        private void SearchLocationID(Guid id)
        {
            //App.Data.StockLocations.Refresh(false);
            //var location = App.Data.StockLocations.FirstOrDefault(x => Guid.Equals(x.ID,id));
            //if (location != null)
            //{
                _viewModel.Holdings.Filter = () =>
                    new Filter<StockHolding>(x => x.Location.ID).IsEqualTo(id).Or(x=>x.Product.ID).IsEqualTo(id);
                _viewModel.Holdings.Refresh(true);
            //}
        }
        
        private void SelectFromHolding_Click(object sender, EventArgs e)
        {
            var holding = (sender as MobileCard)?.BindingContext as StockHoldingShell;
            if (holding == null)
                return;
            ShowPopup(() =>
                {
                    var editor = new SelectFromHoldingView(holding, holding.Units);
                    editor.OnSave += (o, args) =>
                    {
                        var requiItem = _viewModel.RequisitionItems.CreateItem();
                        requiItem.LocationID = args.Holding.LocationID;
                        requiItem.ProductID = args.Holding.ProductID;
                        requiItem.ProductCode = args.Holding.ProductCode;
                        requiItem.ProductName = args.Holding.ProductName;
                        requiItem.StyleID = args.Holding.StyleID;
                        requiItem.StyleCode = args.Holding.StyleCode;
                        requiItem.StyleDescription = args.Holding.StyleDescription;
                        requiItem.JobID = args.Holding.JobID;
                        requiItem.DimensionsUnitID = args.Holding.DimensionsUnitID;
                        requiItem.DimensionsHeight = args.Holding.DimensionsHeight;
                        requiItem.DimensionsWidth = args.Holding.DimensionsWidth;
                        requiItem.DimensionsLength = args.Holding.DimensionsLength;
                        requiItem.DimensionsQuantity = args.Holding.DimensionsQuantity;
                        requiItem.DimensionsWeight = args.Holding.DimensionsWeight;
                        requiItem.DimensionsValue = args.Holding.DimensionsValue;
                        requiItem.DimensionsUnitSize = args.Holding.DimensionsUnitSize;
                        requiItem.ImageID = args.Holding.ImageID;
                        if (args.Holding.Parent.Images.TryGetValue(args.Holding.ImageID, out var _image))
                            _viewModel.RequisitionItems.Images[args.Holding.ImageID] = _image;
                        requiItem.SourceJRI = args.JobRequisitionItemID;
                        requiItem.TargetJRI = args.JobRequisitionItemID;
                        requiItem.Quantity = args.Quantity;
                        requiItem.ActualQuantity = args.Quantity;
                        requiItem.Cost = args.Holding.AverageCost;
                        requiItem.Done = true;
                        _viewModel.RequisitionItems.CommitItem(requiItem);
                        _viewModel.Holdings.Refresh(false);
                        DismissPopup();
                    };
                    editor.OnCancel += (o, args) => DismissPopup();
                    return editor;
                },
                new PopupManagerConfiguration()
                {
                    RequestedHeight = Math.Min(700,500 + (holding.Allocations.Length * 55))
                });
        }
        
        private void SelectJob_Clicked(object sender, MobileButtonClickEventArgs args)
        {
            ShowPopup(() => SelectionView.Execute<JobShell>(
                (columns) =>
                {
                    columns.Add(new MobileGridTextColumn<JobShell>()
                    {
                        Column = x => x.JobNumber, 
                        Width = GridLength.Auto, 
                        Caption = "#",
                        Alignment = TextAlignment.Center
                    });
                    columns.Add(new MobileGridTextColumn<JobShell>()
                    {
                        Column = x => x.Name,
                        Width = GridLength.Star,
                        Caption = "Select Job",
                        Alignment = TextAlignment.Start
                    });
                },
                (refresh) => App.Data.Jobs.Refresh(false), 
                (jobs) =>
                {
                    _viewModel.Job = jobs.FirstOrDefault() ?? App.Data.Jobs.CreateItem();
                    DismissPopup();
                }));

        }

        private async void SaveList_Click(object sender, MobileMenuButtonClickedEventArgs args)
        {
            if (_viewModel.Job.ID == Guid.Empty && !Security.IsAllowed<AllowMobileQuickPickWithoutJob>())
            {
                await MaterialDialog.Instance.AlertAsync("Please select a Job before saving!", "Error");
                return;
            }
            
            using (await MaterialDialog.Instance.LoadingDialogAsync(message: "Saving"))
            {
                try
                {
                    var _requiModel = new RequisitionModel(App.Data, () => new Filter<Requisition>().None());
                    var requi = _requiModel.CreateItem();
                    requi.Title = $"Quick Pick by {App.Data.Me.Name}";
                    requi.RequestedByID = App.Data.Me.ID;
                    requi.Due = DateTime.Now;
                    requi.JobID = _viewModel.Job.ID;
                    _requiModel.CommitItem(requi);
                    _requiModel.Save("Requisition Created from Mobile Quick Pick Module");
                    foreach (var _item in _viewModel.RequisitionItems.Items)
                    {
                        if (_viewModel.Job.ID != _item.JobID)
                            _item.TargetJRI = Guid.Empty;

                        _item.RequisitionID = requi.ID;
                    }

                    _viewModel.RequisitionItems.Save("Created from Mobile Quick Pick Module");
                    requi.Filled = requi.Due;
                    requi.StockUpdated = requi.Filled;
                    _requiModel.Save("Stock Movements created from Mobile Quick Pick Module");
                }
                catch (Exception e)
                {
                    InABox.Mobile.MobileLogging.Log(e);
                }
            }
            Navigation.PopAsync();
        }


    }
}