using System;
using System.Threading.Tasks;
using TINK.Model.Device;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace TINK.View.WhatsNew
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class WhatsNewPage : ContentPage, IViewService
    {
        /// <summary> Holds a reference on the view model. </summary>
        private ViewModel.WhatsNew.WhatsNewViewModel WhatsNewViewModel;

        /// <summary> Constructs whats new page.</summary>
        /// <param name="showMasterDetail">Action to invoke master detail page.</param>
        public WhatsNewPage(Action showMasterDetail)
        {
            InitializeComponent();

            WhatsNewViewModel = new ViewModel.WhatsNew.WhatsNewViewModel(
                DependencyService.Get<IAppInfo>().Version,
                App.ModelRoot.WhatsNew.WhatsNewText,
                App.ModelRoot.WhatsNew.IsShowAgbRequired,
                showMasterDetail,
                this);

            BindingContext = WhatsNewViewModel;
        }

        /// <summary> Displays altert message.</summary>
        /// <param name="title">Title of message.</param>
        /// <param name="message">Message to display.</param>
        /// <param name="details">Detailed error description.</param>
        /// <param name="cancel">Type of buttons.</param>
        public async Task DisplayAdvancedAlert(
            string title,
            string message,
            string details,
            string cancel)
            => await App.Current.MainPage.DisplayAlert(title, $"{message}\r\nDetails:\r\n{details}", cancel);

        public Task PopModalAsync()
        {
            throw new NotImplementedException(); ;
        }

        /// <summary> Pushes a page onto the stack. </summary>
        /// <param name="p_oTypeOfPage">Page to display.</param>
        public Task PushAsync(ViewTypes p_oTypeOfPage)
        {
            throw new NotImplementedException();
        }

        public async Task PushModalAsync(ViewTypes p_oTypeOfPage)
        {
            await Navigation.PushModalAsync((Page)Activator.CreateInstance(p_oTypeOfPage.GetViewType()));
        }

        public void ShowPage(ViewTypes p_oType, string p_strTitle = null)
        {
            throw new NotImplementedException();
        }

        public Task<IViewService.IUserFeedback> DisplayUserFeedbackPopup() => throw new NotSupportedException();

        /// <summary>
        /// Invoked when pages is closed/ hidden.
        /// /// </summary>
        protected override void OnDisappearing()
        {
            base.OnDisappearing();

            if (WhatsNewViewModel == null)
            {
                // View model might be null.
                return;
            }

            WhatsNewViewModel?.OnDisappearing(() =>
            {
                App.ModelRoot.SetWhatsNewWasShown();
                App.ModelRoot.Save();
            });
        }
    }
}