using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Xamarin.Forms;
using InABox.Core;
using InABox.Clients;
using Comal.Classes;
using Xamarin.Forms.Xaml;
using comal.timesheets.Tasks;

namespace comal.timesheets
{
    public delegate void NotificationsClosedEvent(int numberOfNotifications);

    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class NotificationList 
    {

        public event NotificationsClosedEvent NotificationsClosed;
        List<NotificationShell> notificationShells = new List<NotificationShell>();

        #region Constructor + Loading
        public NotificationList()
        {
            InitializeComponent();
            App.Data.Notifications.Load(() =>
            {
                Dispatcher.BeginInvokeOnMainThread(() =>
                {
                    notificationListView.ItemsSource = App.Data.Notifications;
                });
            });
        }
        
        protected override void OnDisappearing()
        {
            NotificationsClosed?.Invoke(notificationShells.Count());
            base.OnDisappearing();
        }
        

        #endregion

        #region Buttons / Taps
        
        private async void NotificationListView_Tapped(object sender, EventArgs e)
        {
            NotificationShell shell = notificationListView.SelectedItem as NotificationShell;
            string extra = CreateOption(shell);
            string chosenOption = await DisplayActionSheet(shell.Description, "Cancel", null, "View / Reply Message", "Dismiss Message", extra);
            ProcessOption(chosenOption, shell);
        }

        private void ProcessOption(string chosenOption, NotificationShell shell)
        {
            switch (chosenOption)
            {
                case "Cancel":
                    return;
                case "View / Reply Message":
                    ReplyNotification(shell);
                    break;
                case "Dismiss Message":
                    DismissNotification(shell);
                    break;
                case VIEWTASK:
                    ViewTask(shell);
                    break;
                case VIEWLEAVE:
                    OpenLeaveList();
                    break;
                case VIEWLEAVEFORM:
                    ViewRequestForm(shell);
                    break;
                case VIEWDELIVERY:
                    ViewDelivery(shell);
                    break;
                default:
                    return;
            }
        }

        private void ViewDelivery(NotificationShell shell)
        {
            DeliveryDetails page = new DeliveryDetails() { DeliveryID = shell.EntityID };
            Navigation.PushAsync(page);
        }

        private void ViewRequestForm(NotificationShell shell)
        {
            DigitalFormHostModel<LeaveRequest, LeaveRequestLink, LeaveRequestForm> model = new DigitalFormHostModel<LeaveRequest, LeaveRequestLink, LeaveRequestForm>();
            LeaveRequest request = new LeaveRequest();
            request.ID = shell.EntityID;
            LeaveRequestForm form = new Client<LeaveRequestForm>().Query(new Filter<LeaveRequestForm>(x => x.Parent.ID).IsEqualTo(shell.EntityID)).Rows.FirstOrDefault().ToObject<LeaveRequestForm>();
            DigitalFormLayout digitalFormLayout = new Client<DigitalFormLayout>().Query(new Filter<DigitalFormLayout>(x => x.Form.ID).IsEqualTo(form.Form.ID).And(x => x.Type).IsEqualTo(DFLayoutType.Mobile)).Rows.FirstOrDefault().ToObject<DigitalFormLayout>();
            model.LoadItems(request, form, digitalFormLayout);
            DigitalFormHost host = new DigitalFormHost(model);
            Navigation.PushAsync(host);
        }

        private void ReplyNotification(NotificationShell shell)
        {
            NewReplyNotification newReplyNotification = new NewReplyNotification(shell.ID);
            Navigation.PushAsync(newReplyNotification);
        }

        private void ViewTask(NotificationShell shell)
        {
            AddEditTask taskPage = new AddEditTask(shell.EntityID);
            Navigation.PushAsync(taskPage);
        }

        private void OpenLeaveList()
        {
            LeaveRequestList leaveRequestList = new LeaveRequestList();
            Navigation.PushAsync(leaveRequestList);
        }

        const string VIEWTASK = "View Task";
        const string VIEWLEAVE = "View Leave";
        const string VIEWLEAVEFORM = "View Leave Request Form";
        const string VIEWDELIVERY = "View Delivery";

        private string CreateOption(NotificationShell shell)
        {
            if (string.IsNullOrWhiteSpace(shell.EntityType))
                return "";
            if (shell.EntityType == "Comal.Classes.Kanban")
                return VIEWTASK;
            if (shell.EntityType == "Comal.Classes.LeaveRequest")
                return VIEWLEAVE;
            if (shell.EntityType == "Comal.Classes.LeaveRequestLink")
                return VIEWLEAVEFORM;
            if (shell.EntityType == "Comal.Classes.Delivery")
                return VIEWDELIVERY;
            else
                return "";
        }

        void New_Clicked(object sender, EventArgs e)
        {
            NewReplyNotification newReplyNotification = new NewReplyNotification();
            Navigation.PushAsync(newReplyNotification);
        }

        void DismissAll_Clicked(object sender, EventArgs e)
        {
            Device.BeginInvokeOnMainThread(() =>
            {
                notificationListView.ItemsSource = null;
                numberOfItemsLbl.Text = "Number of items: 0";
            });
            Task.Run(() =>
            {
                List<Notification> notifications = new List<Notification>();
                foreach (NotificationShell shell in notificationShells)
                {
                    Notification notification = new Notification { ID = shell.ID };
                    notification.Closed = DateTime.Now;
                    notifications.Add(notification);
                }
                new Client<Notification>().Save(notifications, "Dismissed on mobile device");
            });
        }
        #endregion

        #region Utils
        void DismissNotification(NotificationShell shell)
        {
            Task.Run(() =>
            {
                Notification notification = new Notification { ID = shell.ID };
                notificationShells.Remove(shell);
                RefreshListOnMainThread();
                notification.Closed = DateTime.Now;
                new Client<Notification>().Save(notification, "Dismissed on mobile device");
            });
        }
        void RefreshListOnMainThread()
        {
            Device.BeginInvokeOnMainThread(() =>
            {
                notificationListView.ItemsSource = null;
                notificationListView.ItemsSource = notificationShells;
                numberOfItemsLbl.Text = "Number of items: " + notificationShells.Count;
            });
        }
        #endregion

    }


}