using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using CefSharp;
using CefSharp.Wpf;
using Tango.Core.DI;
using Tango.Core.Helpers;
using Tango.Logging;
using Tango.PPC.Browser.BoundsObjects;
using Tango.PPC.Browser.ViewContracts;
using Tango.PPC.Common.Helpers;
using Tango.Touch.Keyboard;

namespace Tango.PPC.Browser.Views
{
    /// <summary>
    /// Interaction logic for MainView.xaml
    /// </summary>
    public partial class BrowserView : UserControl, IBrowserView
    {
        public event EventHandler<string> AddressChanged;

        public static BrowserView Instance { get; set; }

        public BrowserView()
        {
            try
            {
                var settings = new CefSettings();
                settings.BrowserSubprocessPath = @"x86\CefSharp.BrowserSubprocess.exe";
                settings.UserAgent = "Mozilla/5.0 (iPad; CPU OS 12_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148";

                Cef.Initialize(settings, performDependencyCheck: false, browserProcessHandler: null);
            }
            catch (Exception ex)
            {
                LogManager.Default.Log(ex, "Error loading cef.");
            }

            InitializeComponent();

            Instance = this;

            TangoIOC.Default.Register<IBrowserView>(this);

            Helpers.BoundObjectsHelper.RegisterAllBoundObjects(Browser, Dispatcher);

            KeyboardView.Default.KeyboardOpened += Default_KeyboardOpened;
            KeyboardView.Default.KeyboardClosed += Default_KeyboardClosed;

            var handler = new RequestHandlers.ChromiumRequestHandler();
            handler.AddressChanged += Handler_AddressChanged;
            Browser.RequestHandler = handler;
            Browser.LoadError += Browser_LoadError;
            Browser.LoadingStateChanged += Browser_LoadingStateChanged;
        }

        private void Browser_LoadError(object sender, LoadErrorEventArgs e)
        {
            //if (e.ErrorCode == CefErrorCode.ConnectionTimedOut || e.ErrorCode == CefErrorCode.NameNotResolved)
            //{
            InvokeUI(() =>
            {
                runError.Text = e.ErrorText;
                gridError.Visibility = Visibility.Visible;
            });
            //}
        }

        private void Browser_LoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
        {
            if (!e.IsLoading)
            {
                InvokeUI(() =>
                {
                    KeyboardHelper.CloseKeyboard();
                });
            }
            else
            {
                InvokeUI(() =>
                {
                    gridError.Visibility = Visibility.Hidden;
                });
            }
        }

        private void Handler_AddressChanged(object sender, string address)
        {
            InvokeUI(() =>
            {
                AddressChanged?.Invoke(this, address);
            });
        }

        private void Default_KeyboardClosed(object sender, EventArgs e)
        {
            Browser.VerticalAlignment = VerticalAlignment.Stretch;
            Browser.Height = double.NaN;
        }

        private void Default_KeyboardOpened(object sender, EventArgs e)
        {
            Browser.VerticalAlignment = VerticalAlignment.Top;
            Browser.Height = 780;
        }

        public bool CanGoBack()
        {
            return Browser.CanGoBack;
        }

        public void NavigateTo(string address)
        {
            if (Browser.Address != address)
            {
                String uri;

                if (ValidHttpURL(address, out uri))
                {
                    Browser.Address = uri;
                }
                else
                {
                    Browser.Address = $"google.com/search?q={address.Replace(" ", "+")}";
                }
            }
            else
            {
                Browser.Reload();
            }
        }

        public static bool ValidHttpURL(string s, out string result)
        {
            if (Uri.IsWellFormedUriString(s, UriKind.Absolute))
            {
                result = s;
                return true;
            }
            else if (s.StartsWith("www."))
            {
                result = "http://" + s;
                return true;
            }

            result = s;
            return false;
        }

        public void GoBack()
        {
            if (Browser.CanGoBack)
            {
                Browser.Back();
            }
        }

        private async void TxtAddress_GotFocus(object sender, RoutedEventArgs e)
        {
            KeyboardHelper.OpenKeyboard(KeyboardActionKeyMode.Go);
            await Task.Delay(100);
            txtAddress.SelectAll();
        }

        private void TxtAddress_LostFocus(object sender, RoutedEventArgs e)
        {
            KeyboardHelper.CloseKeyboard();
        }

        private void TxtAddress_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Return)
            {
                KeyboardHelper.CloseKeyboard();
                NavigateTo(txtAddress.Text);
            }
        }

        private void TxtAddress_MouseUp(object sender, MouseButtonEventArgs e)
        {
            KeyboardHelper.OpenKeyboard(KeyboardActionKeyMode.Go);
        }

        private async void TxtAddress_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            KeyboardHelper.OpenKeyboard(KeyboardActionKeyMode.Go);
            await Task.Delay(100);
            txtAddress.SelectAll();
        }

        private void InvokeUI(Action action)
        {
            Dispatcher.BeginInvoke(action);
        }
    }
}