using System;
using System.Threading;
using System.Threading.Tasks;
using Comal.Classes.SecurityDescriptors;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Forms.Xaml;

namespace PRS.Mobile
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class HumanResourcesModule
    {

        private CancellationTokenSource _pollingToken;
        
        public HumanResourcesModule()
        {
            InitializeComponent();
            MyDetails.IsVisible = Security.IsAllowed<ViewMobileEmployeeDetailsModule>();
            DigitalForms.IsVisible = Security.IsAllowed<ViewMobileEmployeeFormsModule>();
            LeaveRequests.IsVisible = Security.IsAllowed<ViewMobileLeaveRequestsModule>();
            Qualifications.IsVisible = Security.IsAllowed<ViewMobileQualificationsModule>();
            TimeSheets.IsVisible = Security.IsAllowed<ViewMobileTimesheetsModule>();
        }

        protected override void OnAppearing()
        {
            _pollingToken = new CancellationTokenSource();
            StartMonitoringQualifications();
            StartMonitoringForms();
            base.OnAppearing();
        }

        protected override void OnDisappearing()
        {
            base.OnDisappearing();
            _pollingToken.Cancel();
        }

        private void StartMonitoringQualifications()
        {
            var token = _pollingToken.Token;
            Task.Run(() =>
                {
                    while (!_pollingToken.Token.IsCancellationRequested)
                    {

                        App.Data.EmployeeQualifications.Refresh(true);
                        Dispatcher.BeginInvokeOnMainThread(() =>
                        {
                            Qualifications.Alert = App.Data.EmployeeQualifications.NeedsAttention > 0 
                                ? App.Data.EmployeeQualifications.NeedsAttention.ToString()
                                : "";
                        });
                        
                        Task.Delay(TimeSpan.FromSeconds(30), token)
                            .Wait(token);
                    }
                },
                token
            );
        }
        
        private void StartMonitoringForms()
        {
            var token = _pollingToken.Token;
            Task.Run(() =>
                {
                    while (!_pollingToken.Token.IsCancellationRequested)
                    {

                        App.Data.EmployeeForms.Refresh(true);
                        Dispatcher.BeginInvokeOnMainThread(() =>
                        {
                            DigitalForms.Alert = App.Data.EmployeeForms.NeedsAttention > 0  
                                ? App.Data.EmployeeForms.NeedsAttention.ToString() 
                                : "";
                        });
                        
                        Task.Delay(TimeSpan.FromSeconds(30), token)
                            .Wait(token);
                    }
                },
                token
            );
        }
        
        private void MyDetails_OnTapped(MobileModuleItem sender, ModuleMenuItemTappedArgs args)
        {
            Navigation.PushAsync(new MyDetailsPage());
        }
        
        private void QualificationsBtn_Tapped(MobileModuleItem sender, ModuleMenuItemTappedArgs args)
        {
            Navigation.PushAsync(new EmployeeQualificationList());
        }
        
        private void EmployeeFormsBtn_Tapped(MobileModuleItem sender, ModuleMenuItemTappedArgs args)
        {
            Navigation.PushAsync(new EmployeeForms());
        }
        
        private void LeaveBtn_Tapped(MobileModuleItem sender, ModuleMenuItemTappedArgs args)
        {
            Navigation.PushAsync(new LeaveRequestList());
        }
        
        private void TimesheetsBtn_Tapped(MobileModuleItem sender, ModuleMenuItemTappedArgs args)
        {
            Navigation.PushAsync(new MyTimesheets());
        }
        
    }
}