using HybirdFrameworkCore.Utils;
using log4net;

namespace HybirdFrameworkDriver.ModbusTcpMaster;

public static class ModbusDecoder
{
    private static readonly ILog Log = LogManager.GetLogger(typeof(ModbusDecoder));

    public static T Decode<T>(byte[] bytes) where T : class, new()
    {
        T t = new T();
        List<object?> fields = t.GetType().GetProperties()
            .Where(it => it.PropertyType.GetGenericTypeDefinition() == typeof(ModbusProperty<>))
            .Select(p => p.GetValue(t)).ToList();

        int startRegisterNo = Int32.MaxValue;
        foreach (object? field in fields)
        {
            if (field != null)
            {
                IModbusProperty p = (IModbusProperty)field;
                if (startRegisterNo > p.GetRegisterNo())
                {
                    startRegisterNo = p.GetRegisterNo();
                }
            }
        }

        foreach (object? field in fields)
        {
            switch (field)
            {
                case ModbusProperty<byte> property:
                {
                    SetPropertyValue(startRegisterNo, property, bytes);
                    break;
                }
                case ModbusProperty<float> floatProperty:
                {
                    SetPropertyValue(startRegisterNo, floatProperty, bytes);
                    break;
                }
            }
        }

        return t;
    }

    private static void SetPropertyValue<T>(int startRegisterNo, ModbusProperty<T> field, byte[] bytes)
    {
        int registerNo = field.RegisterNo;
        int start = field.Start;
        int length = field.Length;
        ModbusDataType type = field.Type;
        double scale = field.Scale;
        int round = field.Round;
        double offset = field.Offset;

        start = (registerNo - startRegisterNo) * 16 + start;

        length = type switch
        {
            ModbusDataType.Byte => length * 8,
            ModbusDataType.Register => length * 16,
            _ => length
        };

        Type valueType = typeof(T);

        object value = BitUtls.Bytes2Value(bytes, valueType, start, length, scale, round, offset);
        field.Value = (T)value;
    }
}