/*
  * Copyright (c) 2025 LG Electronics Inc.
   * SPDX-License-Identifier: LicenseRef-LGE-Proprietary
   */
using Aurora.Api;
using System;
using System.Windows;
using System.ComponentModel;
using System.Windows.Threading;
using VisionCommon;

namespace VisionUI.Camera {
    /// <summary>
    /// 메인 카메라 뷰 윈도우
    /// MainCameraViewWindow.xaml BehindCode
    /// </summary>
    public partial class MainCameraViewWindow : Window {
        private static Logger _Logger = new Logger("MainCameraViewWindow");
        private IDisposable _EventDisposable;

        /// <summary>Static 객체(싱글톤)</summary>
        public static MainCameraViewWindow _Instance = null;
        private static readonly object _Lock = new object();

        private bool _IsViewInitialized = false;
        private eDisplayType _displayType = eDisplayType.Main_1;

        private delegate void HideWindow();

        /// <summary>
        /// 싱글톤 객체
        /// </summary>
        public static MainCameraViewWindow Instance {
            get {
                lock (_Lock) {
                    if (_Instance == null) {
                        _Instance = new MainCameraViewWindow();
                    }
                    return _Instance;
                }
            }
        }

        /// <summary>
        /// 생성자
        /// </summary>
        public MainCameraViewWindow() {
            _Instance = this;

            InitializeComponent();
            CreateView();
            SetObservable();
        }

        private void SetObservable() {
            if (_EventDisposable == null) {
                var observable = VisionEventId.GetRecipeActivatedObservable();
                _EventDisposable = observable.Subscribe(_ => UpdateView());
            }
        }

        private void UpdateView()
        {
            Application.Current.Dispatcher.BeginInvoke((Action)(() => {
                var camWindow = MainCameraViewManager.Instance.GetMainCameraView(_displayType);
                // 지속적인 메모리 증가로 인하여 방어코드 생성 - from.MagnetAttch 과제
                if (!gridMainCameraViewWindow.Children.Contains(camWindow))
                {
                    MainCameraViewManager.Instance.DisposeMainCameraView(_displayType);
                    gridMainCameraViewWindow.Children.Clear();
                    gridMainCameraViewWindow.Children.Add(camWindow);
                }
            }));
        }

        /// <summary>
        /// 카메라 뷰 생성
        /// CameraView를 미리 만들어 놓기 위해 프로그램 로딩시 수행
        /// </summary>
        public void CreateView() {
            Application.Current.Dispatcher.BeginInvoke((Action)(() => {
                if (!_IsViewInitialized) {
                    gridMainCameraViewWindow.Children.Add(MainCameraViewManager.Instance.GetMainCameraView(_displayType));
                    _IsViewInitialized = true;
                }
            }));
        }

        protected override void OnClosing(CancelEventArgs e) {
            // Aurora 앱이 닫힌 후에도 해당 팝업이 강제종료될때까지 살아있어, 명시적으로 꺼질 수 있게끔 예외처리코드 추가
            if (Application.Current.MainWindow != null)
            {
                e.Cancel = true;
                Dispatcher.BeginInvoke(DispatcherPriority.Normal, new HideWindow(_HideWindow));
            }
        }

        private void _HideWindow() {
            CameraUcManager.Instance.StopLiveAll();
            this.Hide();
        }
    }
}