using System;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows;
using System.Windows.Input;
using UIShare.ViewModelBase;
using ZLGUSBCANFD;

namespace CANModule.ViewModels
{
    public class SelectCanMessageViewModel : DialogViewModelBase
    {
        #region 属性
        public DialogCloseListener RequestClose { get; set; }

        private ObservableCollection<int> _ChannelList;
        public ObservableCollection<int> ChannelList
        {
            get => _ChannelList;
            set => SetProperty(ref _ChannelList, value);
        }

        private ObservableCollection<string> _messageList;
        public ObservableCollection<string> MessageList
        {
            get => _messageList;
            set => SetProperty(ref _messageList, value);
        }

        private ObservableCollection<string> _signalList;
        public ObservableCollection<string> SignalList
        {
            get => _signalList;
            set => SetProperty(ref _signalList, value);
        }

        private string _title = "CollectCANSignalSetting";
        public string Title
        {
            get => _title;
            set => SetProperty(ref _title, value);
        }

        private string _selectedMessage;
        public string SelectedMessage
        {
            get => _selectedMessage;
            set
            {
                if (SetProperty(ref _selectedMessage, value))
                {
                    // 健壮性检查：防范切换通道时清空选择引发的连锁 Bug
                    if (!string.IsNullOrEmpty(value))
                    {
                        // 使用 FirstOrDefault 代替 First，防止找不到匹配项时导致上位机崩溃
                        var targetMsg = ZLGDBCParser.MsgDatabase[MessageChannel]
                            .FirstOrDefault(x => $"[0x{x.msg_id:X}]{x.msg_name}" == value);

                        if (targetMsg != null && targetMsg.signal_Name != null)
                        {
                            SignalList = new ObservableCollection<string>(targetMsg.signal_Name);
                        }
                        else
                        {
                            SignalList = new ObservableCollection<string>();
                        }
                    }
                    else
                    {
                        SignalList = new ObservableCollection<string>();
                    }
                }
            }
        }

        private string _selectedSignal;
        public string SelectedSignal
        {
            get => _selectedSignal;
            set => SetProperty(ref _selectedSignal, value);
        }

        private int _MessageChannel=-1;
        public int MessageChannel
        {
            get => _MessageChannel;
            set
            {
                if (_MessageChannel != value)
                {
                    _MessageChannel = value;

                    // 1. 先安全清空旧的选择项和信号列表，断开引用链
                    SelectedMessage = null;
                    SelectedSignal = null;
                    SignalList = new ObservableCollection<string>();

                    // 2. 刷新当前通道的报文列表
                    if (ZLGDBCParser.MsgDatabase != null && ZLGDBCParser.MsgDatabase.Count > value)
                    {
                        MessageList = new ObservableCollection<string>(
                            ZLGDBCParser.MsgDatabase[value].Select(s => $"[0x{s.msg_id:X}]{s.msg_name}")
                        );
                    }
                    else
                    {
                        MessageList = new ObservableCollection<string>();
                    }

                    RaisePropertyChanged();
                }
            }
        }
        #endregion

        #region 命令
        public ICommand CloseCommand { get; set; }
        public ICommand GetSelectedMessageCommand { get; set; }
        public ICommand GetSelectedSignalCommand { get; set; }
        public ICommand LoadCommand { get; set; }
        #endregion

        public SelectCanMessageViewModel(IContainerProvider containerProvider) : base(containerProvider)
        {
            CloseCommand = new DelegateCommand(Close);
            GetSelectedMessageCommand = new DelegateCommand(GetSelectedMessage);
            GetSelectedSignalCommand = new DelegateCommand(GetSelectedSignal);
            LoadCommand = new DelegateCommand(Load);
        }

        #region 命令处理
        private void Close()
        {
            RequestClose.Invoke();
        }

        private void Load()
        {
            ChannelList = new ObservableCollection<int>(Enumerable.Range(0, 4));
        }

        private void GetSelectedSignal()
        {
            if (!string.IsNullOrEmpty(SelectedSignal))
            {
                Application.Current.Dispatcher.Invoke(() =>
                {
                    Clipboard.SetDataObject(SelectedSignal);
                });
            }
        }

        private void GetSelectedMessage()
        {
            // 修复原本误写为 SelectedSignal != null 的 Bug，并增加了边界防错
            if (!string.IsNullOrEmpty(SelectedMessage) && SelectedMessage.Contains(']'))
            {
                Application.Current.Dispatcher.Invoke(() =>
                {
                    Clipboard.SetDataObject(SelectedMessage);
                    //var parts = SelectedMessage.Split(']');
                    //if (parts.Length > 1)
                    //{
                    //    Clipboard.SetDataObject(parts[1]); // 复制纯报文名称（如："EngineStatus"）
                    //}
                });
            }
        }
        #endregion
    }
}