using Android.Content;
using Android.Views;
using Android.Widget;
using Google.Android.Material.BottomNavigation;
using Google.Android.Material.Tabs;
using Microsoft.Maui.Handlers;
using System;
using Xamarin.Forms;
using Xamarin.Forms.Clinical6.UI.Controls;
using Xamarin.Forms.Clinical6.Views;

namespace MAUI.Clinical6.Platforms.Android.Controls
{
    public partial class DashboardTabbedPageHandler : ViewHandler<TabbedPage, FrameLayout>
    {
        private TabLayout _tabLayout;
        private BottomNavigationView _bottomNavigationView;
        private TextView _badgeView;
        private TabbedPage _page;
        private int _lastItemId = -1;

        // Use MauiContext.Context when you need Android context
        private Context ContextAndroid => MauiContext?.Context;

        public DashboardTabbedPageHandler() : base(DashboardTabbedPageMapper)
        {
        }

        protected override FrameLayout CreatePlatformView()
        {
            return new FrameLayout(ContextAndroid);
        }

        protected override void ConnectHandler(FrameLayout platformView)
        {
            base.ConnectHandler(platformView);

            if (VirtualView == null)
                return;

            _page = VirtualView;
            _page.CurrentPageChanged += Page_CurrentPageChanged;

            if (_page is DashboardTabPage dashboardPage)
            {
                dashboardPage.DashboardBadgeEvent += DashboardBadgeEventHandler;
            }

            platformView.Post(() => SetupBottomNavigation(platformView));
        }

        protected override void DisconnectHandler(FrameLayout platformView)
        {
            base.DisconnectHandler(platformView);

            if (_page != null)
            {
                _page.CurrentPageChanged -= Page_CurrentPageChanged;

                if (_page is DashboardTabPage dashboardPage)
                    dashboardPage.DashboardBadgeEvent -= DashboardBadgeEventHandler;
            }

            if (_bottomNavigationView != null)
            {
                _bottomNavigationView.SetOnItemSelectedListener(null);
                _bottomNavigationView.SetOnItemReselectedListener(null);
                _bottomNavigationView = null;
            }
        }

        private void Page_CurrentPageChanged(object sender, EventArgs e)
        {
            MainThread.BeginInvokeOnMainThread(() =>
            {
                try
                {
                    if (_bottomNavigationView != null)
                        _bottomNavigationView.SelectedItemId = _lastItemId;
                }
                catch (ObjectDisposedException disposedExc)
                {
                    _page.CurrentPageChanged -= Page_CurrentPageChanged;
                    Console.WriteLine($"DashboardTabbedPageHandler Disposed Exception: {disposedExc}");
                }
            });
        }

        private void DashboardBadgeEventHandler(object sender, int count)
        {
            MainThread.BeginInvokeOnMainThread(() => UpdateBadge(count));
        }

        private void SetupBottomNavigation(FrameLayout platformView)
        {
            for (int i = 0; i < platformView.ChildCount; i++)
            {
                if (platformView.GetChildAt(i) is RelativeLayout layout)
                {
                    for (int j = 0; j < layout.ChildCount; j++)
                    {
                        if (layout.GetChildAt(j) is BottomNavigationView bottomNav)
                        {
                            _bottomNavigationView = bottomNav;

                            // Attach listener objects
                            _bottomNavigationView.SetOnItemSelectedListener(new ItemSelectedListener(_page, ref _lastItemId));
                            _bottomNavigationView.SetOnItemReselectedListener(new ItemReselectedListener(_page, ref _lastItemId));

                            return;
                        }
                    }
                }
            }
        }

        private void UpdateBadge(int count)
        {
            try
            {
                if (_bottomNavigationView == null)
                    return;

                if (count == 0)
                {
                    RemoveBadge();
                    return;
                }

                if (_badgeView == null)
                {
                    var menuView = (BottomNavigationMenuView)_bottomNavigationView.GetChildAt(0);
                    var itemView = (BottomNavigationItemView)menuView.GetChildAt(0);
                    var badgeLayout = LayoutInflater.From(ContextAndroid).Inflate(Resource.Layout.CustomTabLayout, itemView, true);
                    _badgeView = badgeLayout.FindViewById<TextView>(Resource.Id.text_badge);
                }

                _badgeView.Visibility = ViewStates.Visible;
                _badgeView.Text = count.ToString();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }

        private void RemoveBadge()
        {
            if (_bottomNavigationView == null)
                return;

            if (_badgeView == null)
            {
                var menuView = (BottomNavigationMenuView)_bottomNavigationView.GetChildAt(0);
                var itemView = (BottomNavigationItemView)menuView.GetChildAt(0);
                var badgeLayout = LayoutInflater.From(ContextAndroid).Inflate(Resource.Layout.CustomTabLayout, itemView, true);
                _badgeView = badgeLayout.FindViewById<TextView>(Resource.Id.text_badge);
            }

            _badgeView.Visibility = ViewStates.Gone;
            _badgeView.Text = "0";
        }

        private class ItemSelectedListener : Java.Lang.Object, BottomNavigationView.IOnItemSelectedListener
        {
            private readonly TabbedPage _page;
            private int _lastItemId;

            public ItemSelectedListener(TabbedPage page, ref int lastItemId)
            {
                _page = page;
                _lastItemId = lastItemId;
            }

            public bool OnNavigationItemSelected(IMenuItem item)
            {
                _lastItemId = item.ItemId;
                if (_page != null && _lastItemId >= 0 && _lastItemId < _page.Children.Count)
                    _page.CurrentPage = _page.Children[_lastItemId];

                return true;
            }
        }

        private class ItemReselectedListener : Java.Lang.Object, BottomNavigationView.IOnItemReselectedListener
        {
            private readonly TabbedPage _page;
            private int _lastItemId;

            public ItemReselectedListener(TabbedPage page, ref int lastItemId)
            {
                _page = page;
                _lastItemId = lastItemId;
            }

            public void OnNavigationItemReselected(IMenuItem item)
            {
                _lastItemId = item.ItemId;
                if (_page != null && _lastItemId >= 0 && _lastItemId < _page.Children.Count)
                    _page.CurrentPage = _page.Children[_lastItemId];
            }
        }

        // Default property mapper for DashboardTabbedPageHandler
        public static IPropertyMapper<TabbedPage, DashboardTabbedPageHandler> DashboardTabbedPageMapper =
            new PropertyMapper<TabbedPage, DashboardTabbedPageHandler>(ViewHandler.ViewMapper);
    }
}