using System;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using Acr.UserDialogs;
using Bit.App.Abstractions;
using Bit.App.Controls;
using Bit.App.Models.Page;
using Bit.App.Resources;
using Xamarin.Forms;
using XLabs.Ioc;
using Bit.App.Utilities;
using PushNotification.Plugin.Abstractions;
using Plugin.Settings.Abstractions;

namespace Bit.App.Pages
{
    public class VaultListSitesPage : ExtendedContentPage
    {
        private readonly IFolderService _folderService;
        private readonly ISiteService _siteService;
        private readonly IUserDialogs _userDialogs;
        private readonly IClipboardService _clipboardService;
        private readonly IPushNotification _pushNotification;
        private readonly ISettings _settings;
        private readonly bool _favorites;

        public VaultListSitesPage(bool favorites)
        {
            _favorites = favorites;
            _folderService = Resolver.Resolve<IFolderService>();
            _siteService = Resolver.Resolve<ISiteService>();
            _userDialogs = Resolver.Resolve<IUserDialogs>();
            _clipboardService = Resolver.Resolve<IClipboardService>();
            _pushNotification = Resolver.Resolve<IPushNotification>();
            _settings = Resolver.Resolve<ISettings>();

            Init();
        }

        public ExtendedObservableCollection<VaultListPageModel.Folder> Folders { get; private set; } = new ExtendedObservableCollection<VaultListPageModel.Folder>();

        private void Init()
        {
            if(!_favorites)
            {
                ToolbarItems.Add(new AddSiteToolBarItem(this));
            }

            var listView = new ListView
            {
                IsGroupingEnabled = true,
                ItemsSource = Folders,
                HasUnevenRows = true,
                GroupHeaderTemplate = new DataTemplate(() => new VaultListHeaderViewCell(this)),
                ItemTemplate = new DataTemplate(() => new VaultListViewCell(this))
            };
            if(Device.OS == TargetPlatform.iOS)
            {
                listView.Margin = new Thickness(0, 0, -15, 0);
            }
            listView.ItemSelected += SiteSelected;

            Title = _favorites ? AppResources.Favorites : AppResources.MyVault;
            Content = listView;
        }

        protected async override void OnAppearing()
        {
            base.OnAppearing();
            LoadFoldersAsync().Wait();

            if(Device.OS == TargetPlatform.iOS && !_favorites)
            {
                if(!_settings.GetValueOrDefault<bool>(Constants.PushPromptShown))
                {
                    _settings.AddOrUpdateValue(Constants.PushPromptShown, true);
                    await _userDialogs.AlertAsync("bitwarden keeps your vault automatically synced by using push notifications. For the best possible experience, please select \"Ok\" on the following prompt when asked to enable push notifications.", "Enable Automatic Syncing", "Ok, got it!");
                }

                _pushNotification.Register();
            }
        }

        private async Task LoadFoldersAsync()
        {
            var folders = await _folderService.GetAllAsync();
            var sites = _favorites ? await _siteService.GetAllAsync(true) : await _siteService.GetAllAsync();

            var pageFolders = folders.Select(f => new VaultListPageModel.Folder(f, sites.Where(s => s.FolderId == f.Id))).ToList();
            var noneFolder = new VaultListPageModel.Folder(sites.Where(s => s.FolderId == null));
            pageFolders.Add(noneFolder);

            Folders.ResetWithRange(pageFolders.Where(f => f.Any()));
        }

        private void SiteSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var site = e.SelectedItem as VaultListPageModel.Site;
            var page = new ExtendedNavigationPage(new VaultViewSitePage(site.Id));
            Navigation.PushModalAsync(page);
        }

        private async void MoreClickedAsync(VaultListPageModel.Site site)
        {
            var selection = await DisplayActionSheet(site.Name, AppResources.Cancel, null,
                AppResources.View, AppResources.Edit, AppResources.CopyPassword, AppResources.CopyUsername, AppResources.GoToWebsite);

            if(selection == AppResources.View)
            {
                var page = new ExtendedNavigationPage(new VaultViewSitePage(site.Id));
                await Navigation.PushModalAsync(page);
            }
            else if(selection == AppResources.Edit)
            {
                var page = new ExtendedNavigationPage(new VaultEditSitePage(site.Id));
                await Navigation.PushModalAsync(page);
            }
            else if(selection == AppResources.CopyPassword)
            {
                Copy(site.Password, AppResources.Password);
            }
            else if(selection == AppResources.CopyUsername)
            {
                Copy(site.Username, AppResources.Username);
            }
            else if(selection == AppResources.GoToWebsite)
            {
                Device.OpenUri(new Uri(site.Uri));
            }
        }

        private void Copy(string copyText, string alertLabel)
        {
            _clipboardService.CopyToClipboard(copyText);
            _userDialogs.SuccessToast(string.Format(AppResources.ValueHasBeenCopied, alertLabel));
        }

        private async void DeleteClickedAsync(object sender, EventArgs e)
        {
            if(!await _userDialogs.ConfirmAsync(AppResources.DoYouReallyWantToDelete, null, AppResources.Yes, AppResources.No))
            {
                return;
            }

            var mi = sender as MenuItem;
            var site = mi.CommandParameter as VaultListPageModel.Site;
            var deleteCall = await _siteService.DeleteAsync(site.Id);

            if(deleteCall.Succeeded)
            {
                var folder = Folders.Single(f => f.Id == site.FolderId);
                var siteIndex = folder.Select((s, i) => new { s, i }).First(s => s.s.Id == site.Id).i;
                folder.RemoveAt(siteIndex);
                _userDialogs.SuccessToast(AppResources.SiteDeleted);
            }
            else if(deleteCall.Errors.Count() > 0)
            {
                await DisplayAlert(AppResources.AnErrorHasOccurred, deleteCall.Errors.First().Message, AppResources.Ok);
            }
        }

        private class AddSiteToolBarItem : ToolbarItem
        {
            private readonly VaultListSitesPage _page;

            public AddSiteToolBarItem(VaultListSitesPage page)
            {
                _page = page;
                Text = AppResources.Add;
                Icon = "plus";
                Clicked += ClickedItem;
            }

            private async void ClickedItem(object sender, EventArgs e)
            {
                var page = new ExtendedNavigationPage(new VaultAddSitePage());
                await _page.Navigation.PushModalAsync(page);
            }
        }

        private class VaultListViewCell : LabeledDetailCell
        {
            private VaultListSitesPage _page;

            public VaultListViewCell(VaultListSitesPage page)
            {
                _page = page;

                // Adding whitespace to Delete action to account for the negative margin offset on the listview
                var deleteAction = new MenuItem { Text = AppResources.Delete + "   ", IsDestructive = true };
                deleteAction.SetBinding(MenuItem.CommandParameterProperty, new Binding("."));
                deleteAction.Clicked += page.DeleteClickedAsync;

                var moreAction = new MenuItem { Text = AppResources.More };
                moreAction.SetBinding(MenuItem.CommandParameterProperty, new Binding("."));
                moreAction.Clicked += MoreAction_Clicked;

                //SetBinding(CommandParameterProperty, new Binding("."));
                Label.SetBinding<VaultListPageModel.Site>(Label.TextProperty, s => s.Name);
                Detail.SetBinding<VaultListPageModel.Site>(Label.TextProperty, s => s.Username);

                ContextActions.Add(deleteAction);
                ContextActions.Add(moreAction);

                DisclousureTapped += VaultListViewCell_DisclousureTapped;
                ShowDisclousure = true;
                DisclousureImage = "more";
            }

            private void MoreAction_Clicked(object sender, EventArgs e)
            {
                var menuItem = sender as MenuItem;
                var site = menuItem.CommandParameter as VaultListPageModel.Site;
                _page.MoreClickedAsync(site);
            }

            private void VaultListViewCell_DisclousureTapped(object sender, EventArgs e)
            {
                var cell = sender as VaultListViewCell;
                //var site = cell.CommandParameter as VaultListPageModel.Site;
               // _page.MoreClickedAsync(site);
            }
        }

        private class VaultListHeaderViewCell : ViewCell
        {
            public VaultListHeaderViewCell(VaultListSitesPage page)
            {
                var image = new Image
                {
                    Source = "fa_folder_open.png",
                    Margin = new Thickness(16, 0, 0, 0),
                    VerticalOptions = LayoutOptions.CenterAndExpand
                };

                var label = new Label
                {
                    VerticalTextAlignment = TextAlignment.Center,
                    VerticalOptions = LayoutOptions.CenterAndExpand,
                    FontSize = Device.GetNamedSize(NamedSize.Small, typeof(Label)),
                    Style = (Style)Application.Current.Resources["text-muted"]
                };

                label.SetBinding<VaultListPageModel.Folder>(Label.TextProperty, s => s.Name);

                var stackLayout = new StackLayout
                {
                    Orientation = StackOrientation.Horizontal,
                    VerticalOptions = LayoutOptions.FillAndExpand,
                    Children = { image, label },
                    BackgroundColor = Color.FromHex("efeff4")
                };

                View = stackLayout;
                Height = 30;
            }
        }
    }
}