using System;
using System.Collections.ObjectModel;
using System.Windows.Input;
using UIShare.GlobalVariable;
using UIShare.PubEvent;
using UIShare.UIViewModel;
using UIShare.ViewModelBase;

namespace SettingModule.ViewModels
{
 
    public class SettingViewModel : NavigateViewModelBase, IRegionMemberLifetime, IDisposable
    {
        #region 私有字段
        private readonly IScopedProvider _scope;
        private readonly SystemConfig _systemConfig;
        #endregion

        #region 隔离 / 标题
        public bool KeepAlive => true;
        public ScopedContext _scopedContext { get; }
        // 公开一份 GlobalInfo 供双击展开使用（基类 _globalInfo 是 private）
        public GlobalInfo GlobalInfoRef { get; }

        private string _testStatus = string.Empty;
        public string TestStatus
        {
            get => _testStatus;
            set => SetProperty(ref _testStatus, value);
        }
        #endregion

        #region 设备列表 / 选中设备
        /// <summary>左侧设备列表，直接绑定 SystemConfig.DeviceList</summary>
        public ObservableCollection<DeviceInfoModel> DeviceList { get; }

        private DeviceInfoModel? _selectedDevice;
        public DeviceInfoModel? SelectedDevice
        {
            get => _selectedDevice;
            set
            {
                if (SetProperty(ref _selectedDevice, value))
                {
                    OnSelectedDeviceChanged();
                }
            }
        }

        private string _statusMessage = "请在左侧选择设备查看 / 编辑配置";
        public string StatusMessage
        {
            get => _statusMessage;
            set => SetProperty(ref _statusMessage, value);
        }
        #endregion

        #region 命令
        // 双击展开 / 折叠九宫格（与 MonitorView/RecordView 共用同一套 ExpandViewEvent）
        public ICommand RefreshCommand { get; }
        public ICommand SaveCommand { get; }
        public ICommand ResetCommand { get; }
        #endregion

        public SettingViewModel(IContainerExtension container) : base(container)
        {
            _scope = container.CreateScope();
            GlobalInfoRef = container.Resolve<GlobalInfo>();
            _scopedContext = _scope.Resolve<ScopedContext>();
            _systemConfig = _scope.Resolve<SystemConfig>();

            // 直接复用 SystemConfig 的 DeviceList，外部修改可同步反映
            DeviceList = _systemConfig.DeviceList;

            RefreshCommand = new DelegateCommand(OnExpand);
            SaveCommand = new DelegateCommand(OnSave);
            ResetCommand = new DelegateCommand(OnReset);

            // 进来默认选中第一个，让右侧不为空
            if (DeviceList.Count > 0)
            {
                SelectedDevice = DeviceList[0];
            }
        }

        public void Dispose()
        {
            _scope?.Dispose();
        }

        #region 命令处理
        /// <summary>
        /// 选中设备切换：右侧配置面板靠 SelectedDevice 绑定自动刷新，
        /// 这里只负责更新状态栏提示。
        /// </summary>
        private void OnSelectedDeviceChanged()
        {
            if (SelectedDevice == null)
            {
                StatusMessage = "未选中设备";
                return;
            }
            StatusMessage = $"当前配置：{SelectedDevice.DeviceName}（{SelectedDevice.DeviceType}）";
        }

        /// <summary>双击展开 / 折叠九宫格。</summary>
        private void OnExpand()
        {
            if (string.IsNullOrEmpty(TestStatus)) return;
            _eventAggregator.GetEvent<ExpandViewEvent>().Publish(TestStatus);
            GlobalInfoRef.CurrentScope = TestStatus;
        }

        /// <summary>保存当前选中设备的配置（占位，实际写盘逻辑后续接入）。</summary>
        private void OnSave()
        {
            if (SelectedDevice == null)
            {
                StatusMessage = "无可保存的设备";
                return;
            }
            StatusMessage = $"已保存设备 [{SelectedDevice.DeviceName}] 的配置（{DateTime.Now:HH:mm:ss}）";
        }

        /// <summary>重置当前选中设备的配置（占位）。</summary>
        private void OnReset()
        {
            if (SelectedDevice == null)
            {
                StatusMessage = "无可重置的设备";
                return;
            }
            StatusMessage = $"已重置设备 [{SelectedDevice.DeviceName}] 的配置";
        }
        #endregion

        #region 导航
        public override void OnNavigatedTo(NavigationContext navigationContext)
        {
            base.OnNavigatedTo(navigationContext);
            if (navigationContext.Parameters.ContainsKey("Name"))
            {
                TestStatus = navigationContext.Parameters.GetValue<string>("Name");
            }
        }
        #endregion
    }
}