using System.ComponentModel.DataAnnotations;
using System.Reflection;
using System.Runtime.InteropServices;

namespace WCS.Core
{
    public abstract class ProtocolProxyBase : IProtocolProxy
    {
        private string Id = Guid.NewGuid().ToString();
        public ProtocolInfo Info { get; private set; }
        public ushort BytesCount { get; private set; }
        public Dictionary<string, PlcItem> Items = new Dictionary<string, PlcItem>();
        public Type ProtocolType, ProtocolDataType;
        public Device Device { get; private set; }
        public World World { get; private set; }
        private DataBlock Db;

        public ProtocolProxyBase(Device dev, ProtocolInfo info, Type protocolType, World world)
        {
            this.World = world;
            this.Device = dev;
            this.Info = info;
            Db = info.DBInfo.Ex(world);
            Db.DbChanged += Db_DbChanged;
            ProtocolType = protocolType;

            var bitStart = info.Position * 8;//偏移量,按位算

            //this.Start = start;
            //PlcDB db = new PlcDB(null, 50, 100);
            var lst = this.GetType().GetInterfaces().ToList();

            var ps = lst.SelectMany(v => v.GetProperties()).ToArray();
            foreach (var p in ps)
            {
                if (p.GetIndexParameters().Length > 0) continue;
                if (typeof(ProtocolProxyBase).GetProperty(p.Name, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic) != null) continue;

                #region 计算偏移量
                var modeNum = 0;

                var t = p.PropertyType;
                if (t.IsEnum)
                    t = t.GetEnumUnderlyingType();
                if (t == typeof(bool))//bit类型，db块中无须补齐16位
                {
                    modeNum = 1;
                }
                else if (t.IsPrimitive && Marshal.SizeOf(t) == 1)//byte char 等单字节类型，db块中无须补齐16位
                {
                    modeNum = 8;
                }
                else//其他类型，db块中必须补齐16位
                {
                    modeNum = 16;
                }
                var mod = bitStart % modeNum;
                if (mod > 0)
                {
                    bitStart += modeNum - mod;
                }

                #endregion 计算偏移量

                byte arrlen = 0;
                byte strLen = 0;
                if (t.IsArray)
                {
                    var attr = p.GetCustomAttributes(typeof(MaxLengthAttribute), true).FirstOrDefault() as MaxLengthAttribute;
                    if (attr != null)
                        arrlen = (byte)attr.Length;
                }
                else if (p.PropertyType == typeof(string))
                {
                    var attr = p.GetCustomAttributes(typeof(StringLengthAttribute), true).FirstOrDefault() as StringLengthAttribute;
                    strLen = (byte)attr.MaximumLength;
                }
                var m = typeof(DataBlock).GetMethod("Regist");
                m = m.MakeGenericMethod(p.PropertyType);
                var item = m.Invoke(Db, new object[] { this, Id, p.Name, bitStart, arrlen, strLen }) as PlcItem;
                Items.Add(p.Name, item);
                bitStart += item.DataSizeOfBits;
                BytesCount += item.DataSize;
            }

            ProtocolDataType = ProtocolType.Assembly.GetTypes().Where(v => v.IsClass).First(v => v.GetInterface(ProtocolType.Name) != null && v != this.GetType());
        }

        private byte[] Data = new byte[0];

        private void Db_DbChanged(byte[] data)
        {
            var pos = Info.Position - Db.Start;
            var bytes = data.Skip(pos).Take(BytesCount).ToArray();
            if (Data.SequenceEqual(bytes)) return;
            Data = bytes;
            DataChanged();
        }

        protected abstract void DataChanged();

        #region

        public void AddEvent(string eventName, Delegate delgate)
        {
            throw new NotImplementedException();
        }

        public void RemoveEvent(string eventName, Delegate delgate)
        {
            throw new NotImplementedException();
        }

        public T CallReturn<T>(string methodName, params object[] args)
        {
            throw new NotImplementedException();
        }

        public void CallVoid(string methodName, params object[] args)
        {
            throw new NotImplementedException();
        }

        public T Get<T>(string propertyName)
        {
            var item = Items[propertyName] as PlcItem<T>;
            var res = item.Value;
            var channel = Ltc.GetChannel();
            if (channel != null) this.World.OnInternalLog(channel, $"获取值:{Device.Code}.{ProtocolType.Name}.{propertyName}:{res}");
            return res;
        }

        public void Set<T>(string propertyName, T value)
        {
            var item = Items[propertyName] as PlcItem<T>;
            item.Value = value;
            var channel = Ltc.GetChannel(); this.World.OnInternalLog(channel, $"设置值:{Device.Code}.{ProtocolType.Name}.{propertyName} :{value}");
        }

        #endregion
    }
}