using NewLife.IO;
using OPC_Client;
using System.Collections.Generic;
using System;
using System.Linq;

namespace Pas.ScadaService.Core
{
    public class ScadaService
    {
        private readonly string _opcServerName;
        private readonly string _pointName;
        private readonly Client _client = new Client();
        public ScadaService(string serverName, string pointName)
        {
            _opcServerName = serverName;
            _pointName = pointName;
        }

        #region [Public]

        /// <summary>
        /// 开始
        /// </summary>
        public void Start()
        {
            using (var csv = new CsvFile(_pointName))
            {
                var headers = csv.ReadLine();
                var all = csv.ReadAll();
                if (headers?.Length != 3) return;
                foreach (var row in all)
                {
                    _client.itemIDs.Add(row[0]);
                    _client.descritions.Add(row[1]);
                    _client.equipMentCodes.Add(row[2]);
                }
            }
            //建立连接
            _client._opcServerName = _opcServerName;
            _client.Connect();
            if (!_client.isConnected)
            {
                throw new Exception("连接失败");
            }
            _client.Data_Change += DataChange;
        }

        /// <summary>
        /// 停止
        /// </summary>
        public void Stop()
        {
            if (!_client.isConnected) return;
            _client.Disconnect();
            _client.Data_Change -= DataChange;
        }

        public List<Data> GetAllData()
            => _client.dataCenter.Select(c => c.Value).ToList();

        /// <summary>
        /// 改变事件
        /// </summary>
        public event Action<Dictionary<int, Data>, List<int>> ChangeEvent;
        #endregion

        #region [Event]

        /// <summary>
        /// 变更记录
        /// </summary>
        /// <param name="numItems"></param>
        /// <param name="clientHandles"></param>
        private void DataChange(int numItems, ref Array clientHandles)
        {
            var changeItems = clientHandles.Cast<int>().ToList();
            ChangeEvent?.Invoke(_client.dataCenter, changeItems);
        }

        #endregion
    }
}