//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using TouchSocket.Core;
using TouchSocket.Sockets;

namespace TouchSocket.Http.WebSockets
{
    /// <summary>
    /// WS命令行插件。
    /// </summary>
    public abstract class WSCommandLinePlugin : WebSocketPluginBase
    {
        private readonly Dictionary<string, Method> pairs = new Dictionary<string, Method>();
        private readonly ILog m_logger;

        /// <summary>
        /// 字符串转换器，默认支持基础类型和Json。可以自定义。
        /// </summary>
        public StringConverter Converter { get; }

        /// <summary>
        /// 是否返回执行异常。
        /// </summary>
        public bool ReturnException { get; set; } = true;

        /// <summary>
        /// 当有执行异常时，不返回异常。
        /// </summary>
        /// <returns></returns>
        public WSCommandLinePlugin NoReturnException()
        {
            ReturnException = false;
            return this;
        }

        /// <summary>
        /// WSCommandLinePlugin
        /// </summary>
        /// <param name="logger"></param>
        /// <exception cref="ArgumentNullException"></exception>
        protected WSCommandLinePlugin(ILog logger)
        {
            m_logger = logger ?? throw new ArgumentNullException(nameof(logger));
            Converter = new StringConverter();
            var ms = GetType().GetMethods(BindingFlags.Public | BindingFlags.Instance).Where(a => a.Name.EndsWith("Command"));
            foreach (var item in ms)
            {
                pairs.Add(item.Name.Replace("Command", string.Empty), new Method(item));
            }
        }

        /// <summary>
        /// <inheritdoc/>
        /// </summary>
        /// <param name="client"></param>
        /// <param name="e"></param>
        protected override void OnHandleWSDataFrame(ITcpClientBase client, WSDataFrameEventArgs e)
        {
            if (e.DataFrame.Opcode == WSDataType.Text)
            {
                try
                {
                    string[] strs = e.DataFrame.ToText().Split(' ');
                    if (strs.Length > 0 && pairs.TryGetValue(strs[0], out Method method))
                    {
                        var ps = method.Info.GetParameters();
                        object[] os = new object[ps.Length];
                        int index = 0;
                        for (int i = 0; i < ps.Length; i++)
                        {
                            if (ps[i].ParameterType.IsInterface && typeof(ITcpClientBase).IsAssignableFrom(ps[i].ParameterType))
                            {
                                os[i] = client;
                            }
                            else
                            {
                                os[i] = Converter.ConvertFrom(strs[index + 1], ps[i].ParameterType);
                                index++;
                            }
                        }

                        e.Handled = true;

                        try
                        {
                            object result = method.Invoke(this, os);
                            if (method.HasReturn)
                            {
                                if (client is HttpClient httpClient)
                                {
                                    httpClient.SendWithWS(Converter.ConvertTo(result));
                                }
                                else if (client is HttpSocketClient httpSocketClient)
                                {
                                    httpSocketClient.SendWithWS(Converter.ConvertTo(result));
                                }
                            }
                        }
                        catch (Exception ex)
                        {
                            if (ReturnException)
                            {
                                if (client is HttpClient httpClient)
                                {
                                    httpClient.SendWithWS(Converter.ConvertTo(ex.Message));
                                }
                                else if (client is HttpSocketClient httpSocketClient)
                                {
                                    httpSocketClient.SendWithWS(Converter.ConvertTo(ex.Message));
                                }
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    m_logger.Exception(this, ex);
                }
            }

            base.OnHandleWSDataFrame(client, e);
        }
    }
}