/*
  * Copyright (c) 2022 LG Electronics Inc.
  * SPDX-License-Identifier: LicenseRef-LGE-Proprietary
  */
using Aurora;
using Aurora.Api;
using Aurora.View;
using AuroraUIComponent.Sequence;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reactive.Linq;
using System.Text;
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;

namespace AuroraUIComponent.UserControls.TabView
{
    /// <summary>
    /// Interaction logic for UCTabControl.xaml
    /// </summary>
    public partial class UCTabControl : UserControl
    {
        readonly Aurora.Api.Logger Log = new Aurora.Api.Logger("UCTabControl");

        IAuroraEnvironment _AuroraEnv;

        public class TabItemEx : NotifyPropertyChangedBase
        {
            private string _Title = "(Unknown)";
            public string Title { get => _Title; set => SetProperty(ref _Title, value); }

            private FrameworkElement _Content;
            public FrameworkElement Content { get => _Content; set => SetProperty(ref _Content, value); }

            private Visibility _TabVisible;
            public Visibility TabVisible { get => _TabVisible; set => SetProperty(ref _TabVisible, value); }

            private bool _IsEnabled = true;
            public bool IsEnabled { get => _IsEnabled; set => SetProperty(ref _IsEnabled, value); }

            public TabItemEx(string title, FrameworkElement content, bool isVisible = true, bool isEnabled = true)
            {
                Title = title;
                Content = content;
                TabVisible = isVisible ? Visibility.Visible : Visibility.Collapsed;
                IsEnabled = isEnabled;
            }
        }

        List<TabItemEx> TabList;

        private int _TabIndex = 0;
        private bool _EnableMenuChangebyUI = false;

        private ICommand _OnSelectionChanged;

        public UCTabControl(IAuroraEnvironment aurora, List<TabItemEx> tabList, bool enableMenuChangebyUI = true, ICommand onSelectionChanged = null)
        {
            InitializeComponent();

            _AuroraEnv = aurora;
            TabList = tabList;
            _TabIndex = 0;
            _EnableMenuChangebyUI = enableMenuChangebyUI;
            _OnSelectionChanged = onSelectionChanged;

            var langTokens = Application.Current.Resources["langTokens"] as LangTokens;

            foreach (var item in TabList) {
                TabItem tab = new TabItem();

                Binding bindingTitle = new Binding($"[{item.Title}]");
                bindingTitle.Source = langTokens;
                bindingTitle.Mode = BindingMode.OneWay;
                tab.SetBinding(TabItem.HeaderProperty, bindingTitle);

                Binding bindingVisibility = new Binding("TabVisible");
                bindingVisibility.Source = item;
                //bindingVisibility.Converter = (IValueConverter)this.Resources["convVisibleCollapsed"];
                bindingVisibility.Mode = BindingMode.OneWay;
                tab.SetBinding(TabItem.VisibilityProperty, bindingVisibility);

                Binding bindingIsEnabled = new Binding("IsEnabled");
                bindingIsEnabled.Source = item;
                bindingIsEnabled.Mode = BindingMode.OneWay;
                tab.SetBinding(TabItem.IsEnabledProperty, bindingIsEnabled);

                Binding bindingContent = new Binding("Content");
                bindingContent.Source = item;
                bindingContent.Mode = BindingMode.OneWay;
                tab.SetBinding(TabItem.ContentProperty, bindingContent);
                //tab.Content = item.Content;

                tabParent.Items.Add(tab);
            }

            _AuroraEnv.EventObservable.AsObservable(ScreenShotSequence.SYS_REQ_MENU_CHANGE_EXT).Select(x => x.Param as string).Subscribe(y => ChangeMenu(y));
        }

        public void ChangeMenu(string title)
        {
            if (TabList.Any(x => x.Title == title)) {
                Log.D($"ChangeMenu : {ScreenShotSequence.SYS_REQ_MENU_CHANGE_EXT} / {title}");
                var tab = TabList.FirstOrDefault(x => x.Title == title);
                ChangeMenuInternal(TabList.IndexOf(tab));
            }
        }

        public void ChangeMenu(int tabIndex)
        {
            ChangeMenuInternal(tabIndex);
        }

        private void ChangeMenuInternal(int tabIndex)
        {
            Application.Current.Dispatcher.Invoke(delegate {
                if (tabIndex >= 0 && TabList.Count > tabIndex && tabParent.SelectedIndex != tabIndex) {
                    tabParent.SelectedIndex = tabIndex;
                }
            });
        }

        public void ChangeMenuVisibility(int tabIndex, Visibility visibility)
        {
            Application.Current.Dispatcher.Invoke(delegate {

                if (tabParent.Items.Count > tabIndex) {
                    (tabParent.Items[tabIndex] as TabItem).Visibility = visibility;
                }
            });
        }

        public void ChangeMenuVisibility(string title, bool isVisible)
        {
            Application.Current.Dispatcher.Invoke(delegate {

                //foreach (var tabItem in tabParent.Items) {
                foreach (var tabItem in TabList) {
                    if (tabItem.Title == title) {
                        tabItem.TabVisible = isVisible ? Visibility.Visible : Visibility.Collapsed;
                    }
                }
            });
        }

        public void ChangeMenuEnable(string title, bool isEnabled)
        {
            Application.Current.Dispatcher.Invoke(delegate {

                //foreach (var tabItem in tabParent.Items) {
                foreach (var tabItem in TabList) {
                    if (tabItem.Title == title) {
                        tabItem.IsEnabled = isEnabled;
                    }
                }
            });
        }

        private void UserControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (_IsChangingTab)
                return;

            if (!IsVisible) {
                // ITabControl (CanClose) Interface 체크
                if (tabParent.SelectedIndex >= 0 && tabParent.SelectedIndex < TabList.Count) {
                    if ((TabList[tabParent.SelectedIndex].Content.DataContext is ITabContent tabContent)) {
                        _IsChangingTab = true;
                        if (tabContent.CanClose()) {
                            // continue
                        }
                        _IsChangingTab = false;
                    }
                }
            }
        }

        private bool _IsChangingTab = false;
        private void tabParent_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_IsChangingTab)
                return;

            if (e.Source is TabControl tabControl) {
                // Before
                TabItem _CurrentTab = e.RemovedItems.Count > 0 ? e.RemovedItems[0] as TabItem : null;

                // After (새로 선택된 Tab) : 현재 불필요
                //TabItem _NewTab = e.AddedItems.Count > 0 ? e.AddedItems[0] as TabItem : null;

                // Perform your logic here
                if (!_EnableMenuChangebyUI) {
                    // UI로 Enable 허용하지 않을 경우 이전 TabIndex로 돌려놓기 (tab change 취소)
                    _IsChangingTab = true;
                    tabControl.SelectedItem = _CurrentTab;
                    _IsChangingTab = false;
                    return;
                } else {
                    // ITabControl (CanClose) Interface 체크
                    if ((_CurrentTab?.Content is UserControl uc) && (uc.DataContext is ITabContent tabContent)) {
                        if (tabContent.CanClose()) {
                            // continue
                        } else {
                            // Cancel the tab change
                            _IsChangingTab = true;
                            tabControl.SelectedItem = _CurrentTab;
                            _IsChangingTab = false;
                            return;
                        }
                    }
                }
            }

            // 로그 : 특정 탭에서 여러번 호출되는 원인 불명... 궁금...
            //Log.FuncV($"Tab {_TabIndex} => {(sender as TabControl).SelectedIndex} : {((sender as TabControl).SelectedItem as TabItem)?.Header}");
            _TabIndex = (sender as TabControl).SelectedIndex;

            if (_OnSelectionChanged != null) {
                _OnSelectionChanged.Execute(_TabIndex);
            }
        }
    }

    public interface ITabContent
    {
        bool CanClose();
    }
}