#region << 版 本 注 释 >>

/*--------------------------------------------------------------------
 * 版权所有 (c) 2025 WenJY 保留所有权利。
 * CLR版本：4.0.30319.42000
 * 机器名称：Mr.Wen's MacBook Pro
 * 命名空间：Sln.Imm.Daemon.Opc.Impl
 * 唯一标识：3143E6AC-55C1-46DA-BDF8-8A19682A8A26
 *
 * 创建者：WenJY
 * 电子邮箱：
 * 创建时间：2025-09-22 17:25:33
 * 版本：V1.0.0
 * 描述：
 *
 *--------------------------------------------------------------------
 * 修改人：
 * 时间：
 * 修改说明：
 *
 * 版本：V1.0.0
 *--------------------------------------------------------------------*/

#endregion << 版 本 注 释 >>

using Sln.Imm.Daemon.Model.dto;
using TitaniumAS.Opc.Client;
using TitaniumAS.Opc.Client.Common;
using TitaniumAS.Opc.Client.Da;
using TitaniumAS.Opc.Client.Da.Browsing;

namespace Sln.Imm.Daemon.Opc.Impl;

public class OpcDaService : IOpcService, IDisposable
{
    private OpcDaServer _server;
    private bool _disposed = false;

    public OpcDaService()
    {
        // 初始化 TitaniumAS.Opc.Client 库
        Bootstrap.Initialize();
    }

    public async Task<bool> ConnectAsync(string serverUrl)
    {
        try
        {
            // 构建服务器URL
            Uri url = UrlBuilder.Build(serverUrl);

            // 创建服务器实例并连接
            _server = new OpcDaServer(url);
            _server.Connect();

            return _server.IsConnected;
        }
        catch (Exception ex)
        {
            Console.WriteLine($"连接到 OPC DA 服务器失败: {ex.Message}");
            return false;
        }
    }

    public async Task DisconnectAsync()
    {
        if (_server != null && _server.IsConnected)
        {
            _server.Disconnect();
            _server.Dispose();
            _server = null;
        }
    }

    public async Task<List<OpcNode>> ReadNodeAsync(List<string> nodeId)
    {
        if (_server == null || !_server.IsConnected)
            throw new Exception("未连接到 OPC DA 服务器");

        try
        {
            // 创建临时组和项进行读取
            using (var group = _server.AddGroup("TempReadGroup"))
            {
                group.IsActive = true;

                OpcDaItemDefinition[] definitions = new OpcDaItemDefinition[nodeId.Count];

                for (int i = 0; i < nodeId.Count; i++)
                {
                    var definition = new OpcDaItemDefinition
                    {
                        ItemId = nodeId[i],
                        IsActive = true
                    };

                    definitions[i] = definition;
                }

                // 添加要读取的项


                var results = group.AddItems(definitions);

                if (results[0].Error.Failed)
                    throw new Exception($"添加项失败: {results[0].Error}");

                // 读取项值
                var values = await group.ReadAsync(group.Items);

                if (values[0].Error.Failed)
                    throw new Exception($"读取失败: {values[0].Error}");

                var indexedNodeIds = nodeId.Select((value, index) => new { Index = index, Value = value });

                List<OpcNode> result = new List<OpcNode>();

                foreach (var item in indexedNodeIds)
                {
                    var dataValue = values[item.Index];
                    result.Add(new OpcNode()
                    {
                        NodeId = item.Value,
                        DisplayName = item.Value,
                        Value = dataValue.Value,
                        SourceTimestamp = dataValue.Timestamp,
                        DataType = values[0].Value?.GetType().Name ?? "Unknown"
                    });
                }
                return result;
            }
        }
        catch (Exception ex)
        {
            throw new InvalidOperationException($"OPC DA 读取节点时出错:{ex.Message}");
        }
    }

    public async Task WriteNodeAsync(string nodeId, object value)
    {
        if (_server == null || !_server.IsConnected)
            throw new Exception("未连接到 OPC DA 服务器");

        try
        {
            // 创建临时组和项进行写入
            using (var group = _server.AddGroup("TempWriteGroup"))
            {
                group.IsActive = true;

                // 添加要写入的项
                var definition = new OpcDaItemDefinition
                {
                    ItemId = nodeId,
                    IsActive = true
                };

                var results = group.AddItems(new[] { definition });

                if (results[0].Error.Failed)
                    throw new Exception($"添加项失败: {results[0].Error}");

                // 写入值
                var item = results[0].Item;
                var writeResult = await group.WriteAsync(new[] { item }, new[] { value });

                if (writeResult[0].Failed)
                    throw new Exception($"写入失败: {writeResult[0]}");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"写入节点时出错: {ex.Message}");
            throw;
        }
    }

    public async Task<List<OpcNode>> BrowseNodesAsync(string startingNodeId = null)
    {
        if (_server == null || !_server.IsConnected)
            throw new Exception("未连接到 OPC DA 服务器");

        var nodes = new List<OpcNode>();

        try
        {
            // 使用浏览功能浏览服务器地址空间
            var browser = new OpcDaBrowserAuto(_server);
            var elements = browser.GetElements(startingNodeId);

            foreach (var element in elements)
            {
                nodes.Add(new OpcNode
                {
                    NodeId = element.ItemId,
                    DisplayName = element.Name,
                    DataType = "Unknown" // OPC DA 浏览不直接提供数据类型
                });

                // 如果元素有子元素，递归浏览
                if (element.HasChildren)
                {
                    var childNodes = await BrowseNodesAsync(element.ItemId);
                    nodes.AddRange(childNodes);
                }
            }

            return nodes;
        }
        catch (Exception ex)
        {
            Console.WriteLine($"浏览节点时出错: {ex.Message}");
            throw;
        }
    }

    public void Dispose()
    {
        if (!_disposed)
        {
            DisconnectAsync().Wait();
            _disposed = true;
        }
    }
}