using DeviceCommand.Devices;
using Prism.Commands;
using Prism.Ioc;
using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Input;
using UIShare.GlobalVariable;
using UIShare.ViewModelBase;

namespace DeviceEditModule.ViewModels
{
    /// <summary>
    /// ANEVH80 电子负载 控制面板 ViewModel
    /// </summary>
    public class ANEVH80ViewModel : NavigateViewModelBase, IDisposable
    {
        private readonly DeviceManager _dm;
        private ANEVH80? _dev;
        private CancellationTokenSource? _cts;

        private string _deviceName = "ANEVH80";
        public string DeviceName { get => _deviceName; set => SetProperty(ref _deviceName, value); }
        private bool _isConnected;
        public bool IsConnected { get => _isConnected; set => SetProperty(ref _isConnected, value); }
        private bool _isBusy;
        public bool IsBusy { get => _isBusy; set => SetProperty(ref _isBusy, value); }

        #region 输入参数

        #endregion

        #region 测量结果
        private double _measuredValue;
        public double MeasuredValue { get => _measuredValue; set => SetProperty(ref _measuredValue, value); }
        private string _responseLog = "";
        public string ResponseLog { get => _responseLog; set => SetProperty(ref _responseLog, value); }
        #endregion

        #region 命令
        public ICommand QueryIdn { get; } public ICommand Measure { get; }
        #endregion

        public ANEVH80ViewModel(IContainerProvider cp) : base(cp)
        {
            _dm = cp.Resolve<DeviceManager>();
            QueryIdn = new DelegateCommand(async () => await Exec(async () => Log("IDN: 占位符设备")));
            Measure = new DelegateCommand(async () => await Exec(async () => { MeasuredValue = await _dev!.占位符(Ct()); Log($"测量值={MeasuredValue}"); }));
            Initialize();
        }

        #region 初始化 / Navigation

        public void Initialize(string? deviceName = null)
        {
            ANEVH80? found = null; string? fn = null;
            if (deviceName != null && _dm.DeviceMap.TryGetValue(deviceName, out var d) && d is ANEVH80 e)
            { found = e; fn = deviceName; }
            else
            {
                foreach (var kv in _dm.DeviceMap)
                    if (kv.Value is ANEVH80 it) { found = it; fn = kv.Key; break; }
            }
            _dev = found;
            DeviceName = fn ?? "ANEVH80 (未找到)";
            IsConnected = _dev?.IsConnected ?? false;
            Log(found != null
                ? $"已关联设备 [{DeviceName}]，连接:{(IsConnected ? "已连接" : "未连接")}"
                : "未在 DeviceManager 中找到 ANEVH80 设备");
        }

        public override void OnNavigatedTo(NavigationContext context)
        {
            var pName = context.Parameters.GetValue<string?>("DeviceName");
            Initialize(pName);
        }

        #endregion

        #region 辅助

        private CancellationToken Ct() => (_cts = new CancellationTokenSource(TimeSpan.FromSeconds(10))).Token;

        private async Task Exec(Func<Task> action)
        {
            if (_dev == null) { Log("错误：未关联到设备实例，请检查设备配置。"); return; }
            if (IsBusy) return;
            IsBusy = true;
            try
            {
                await action();
                IsConnected = _dev.IsConnected;
            }
            catch (OperationCanceledException) { Log("命令超时或已取消。"); }
            catch (Exception ex) { Log($"错误：{ex.Message}"); }
            finally { IsBusy = false; }
        }

        private void Log(string message)
        {
            var line = $"[{DateTime.Now:HH:mm:ss}] {message}";
            ResponseLog = ResponseLog.Length > 4000
                ? line + "\n" + ResponseLog[..3000]
                : line + "\n" + ResponseLog;
        }

        #endregion

        public void Dispose()
        {
            _cts?.Cancel();
            _cts?.Dispose();
        }
    }
}