using CefSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.Commands;
using Tango.PPC.Browser.Navigation;
using Tango.PPC.Browser.ViewContracts;
using Tango.PPC.Common;
using Tango.PPC.Common.Navigation;
using Tango.Touch.Keyboard;

namespace Tango.PPC.Browser.ViewModels
{
    /// <summary>
    /// Represents the main view VM and entry point for <see cref="Synchronization.MyModule"/>.
    /// </summary>
    /// <seealso cref="Tango.PPC.Common.PPCViewModel" />
    public class BrowserViewVM : PPCViewModel<IBrowserView>, INavigationObjectReceiver<BrowserNavigationRequest>
    {
        private bool _isFromObject;

        private String _address;
        public String Address
        {
            get { return _address; }
            set { _address = value; RaisePropertyChangedAuto(); }
        }

        private bool _displayAddressBar;
        public bool DisplayAddressBar
        {
            get { return _displayAddressBar; }
            set { _displayAddressBar = value; RaisePropertyChangedAuto(); }
        }

        public RelayCommand GoCommand { get; set; }

        public BrowserViewVM()
        {
            DisplayAddressBar = true;

            GoCommand = new RelayCommand(Go);
        }

        public override void OnViewAttached()
        {
            base.OnViewAttached();
            View.AddressChanged += View_AddressChanged;
        }

        private void View_AddressChanged(object sender, string address)
        {
            Address = address;
        }

        public override void OnNavigatedTo()
        {
            base.OnNavigatedTo();

            KeyboardView.Default.OutputMode = KeyboardOutputMode.Windows;

            if (!_isFromObject)
            {
                DisplayAddressBar = true;
            }

            _isFromObject = false;
        }

        public override void OnNavigatedFrom()
        {
            base.OnNavigatedFrom();
            KeyboardView.Default.OutputMode = KeyboardOutputMode.Wpf;
        }

        public override Task<bool> OnNavigateBackRequest() 
        {
            if (View != null && View.CanGoBack())
            {
                View.GoBack();
                return Task.FromResult(false);
            }
            else
            {
                return Task.FromResult(true);
            }
        }

        /// <summary>
        /// Called when the application has been started
        /// </summary>
        public override void OnApplicationStarted()
        {

        }

        public override void OnApplicationShuttingDown()
        {
            base.OnApplicationShuttingDown();

            try
            {
                Cef.Shutdown();
            }
            catch (Exception ex)
            {
                LogManager.Log(ex, "Error shutting down cef.");
            }
        }

        private void Go()
        {
            if (View != null)
            {
                View.NavigateTo(Address);
            }
        }

        public void OnNavigatedToWithObject(BrowserNavigationRequest obj)
        {
            _isFromObject = true;

            DisplayAddressBar = obj.DisplayAddressBar;

            if (obj.Address != null)
            {
                Address = obj.Address;
                Go();
            }
        }
    }
}