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

namespace PRS.Mobile
{
    public class ConsignmentModuleSettings : ILocalConfigurationSettings
    {
        public String FilterName { get; set; }
    }
    
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class ConsignmentsModule : MobilePage
    {
        private ConsignmentModuleSettings _settings;
        
        private CoreFilterDefinitions _filters;

        private ConsignmentModel _consignments = new ConsignmentModel(App.Data, () => null) { FileName = "consignments.index" };
        
        public ConsignmentsModule()
        {            
            Task[] _setup = new Task[]
            {
                Task.Run(() => { _settings = new LocalConfiguration<ConsignmentModuleSettings>().Load(); }),
                Task.Run(() => { _filters = _consignments.AvailableFilters(); }),
            };
            InitializeComponent();
            
            Task.WaitAll(_setup);
            
            SetupFilters();
        }

        private void SetupFilters()
        {
            _filter.Items.Clear();
            foreach (var group in _filters)
            {
                var item = new MobileMenuItem() { Text = group.Name };
                item.Clicked += (sender, args) =>
                {
                    var text = (sender as MobileMenuItem)?.Text ?? string.Empty;
                    _settings.FilterName = text;
                    new LocalConfiguration<ConsignmentModuleSettings>().Save(_settings);
                    RefreshData(true, false);
                };
                _filter.Items.Add(item);
            }

            _filter.IsVisible = _filter.Items.Any();
        }

        private void RefreshData(bool force, bool async)
        {
            _consignments.SelectFilter(_settings.FilterName);     
            if (async)
            {
                _consignments.Refresh(force, () => Device.BeginInvokeOnMainThread(Refresh));
            }
            else
            {
                _consignments.Refresh(true);
                Refresh();
            }
        }
        
        private void Refresh()
        {
            _consignmentlist.LastUpdated = _consignments.LastUpdated;
            Title = String.IsNullOrWhiteSpace(_settings.FilterName) ? "All Consignments" : _settings.FilterName;
            _consignments.Search(FilterShell);
            _consignmentlist.ItemsSource = _consignments.Items;
        }


        private string _currentfilter = "";

        private bool FilterShell(ConsignmentShell shell)
        {
            if (String.IsNullOrWhiteSpace(_currentfilter))
                return true;
            return shell.Number.ToUpper().Contains(_currentfilter.ToUpper())
                   || shell.SupplierName.ToUpper().Contains(_currentfilter.ToUpper())
                   || shell.TypeDescription.ToUpper().Contains(_currentfilter.ToUpper());
        }
        
        private void _search_OnTextChanged(object sender, MobileSearchBarTextChangedArgs args)
        {
            _currentfilter = args.Text;
            Refresh();
        }
        
        private void MobileList_OnRefresh(object sender, MobileListRefreshEventArgs args)
        {
            RefreshData(true, false);
        }
        
        private void Consignment_Clicked(object sender, EventArgs e)
        {
            if ((sender as MobileCard)?.BindingContext is ConsignmentShell shell)
            {
                var editor = new ConsignmentEdit(shell);
                Navigation.PushAsync(editor);
            }
        }
        
        private ConsignmentShell? _newshell;
        
        protected override void OnAppearing()
        {
            base.OnAppearing();
            if ((_newshell != null) && (_newshell.ID != Guid.Empty))
                _consignments.CommitItem(_newshell);
            _newshell = null;
            RefreshData(true, false);
        }
        
        private void AddConsignment_Clicked(object sender, MobileMenuButtonClickedEventArgs args)
        {
            ShowPopup(() => SelectionView.Execute<PurchaseOrderShell>(
                (columns) =>
                {
                    columns.Add(new MobileGridTextColumn<PurchaseOrderShell>()
                    {
                        Column = x => x.PONumber,
                        Width = GridLength.Auto,
                        Caption = "Number",
                        Alignment = TextAlignment.Start
                    });
                    columns.Add(new MobileGridTextColumn<PurchaseOrderShell>()
                    {
                        Column = x => x.SupplierName,
                        Width = GridLength.Star,
                        Caption = "Select Purchase Order",
                        Alignment = TextAlignment.Start
                    });
                },
                (refresh) =>
                {
                    var model = new PurchaseOrderModel(App.Data,
                        () => new Filter<PurchaseOrder>(x => x.IssuedDate).IsNotEqualTo(DateTime.MinValue)
                            .And(x=>x.ClosedDate).IsEqualTo(DateTime.MinValue)
                            .And(x=>x.CancelledDate).IsEqualTo(DateTime.MinValue)
                            .And(x=>x.Unreceived).IsNotEqualTo(FilterConstant.Null)) { FileName = "consigment_orders.index" };
                    return model.Refresh(false);
                },
                (orders) =>
                {
                    var order = orders.FirstOrDefault() ?? new PurchaseOrderShell();
                    _newshell = _consignments.CreateItem();
                    _newshell.SupplierID = order.SupplierID;
                    _newshell.SupplierName = order.SupplierName;
                    _newshell.Number = order.PONumber;
                    _newshell.EstimatedWarehouseArrival = order.DueDate;
                    _newshell.ActualWarehouseArrival = DateTime.Now;
                    _newshell.Description = $"Goods Received on PO {order.PONumber}";
                    Navigation.PushAsync(new ConsignmentEdit(_newshell, orders.FirstOrDefault()));
                    DismissPopup();
                }));
            

        }
    }
}