using ZB.MOM.WW.OtOpcUa.Core.Abstractions;

namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy;

/// <summary>
///     PCCC data types that map onto SLC / MicroLogix / PLC-5 files. Narrower than Logix — no
///     symbolic UDTs; every type is file-typed and fixed-width.
/// </summary>
public enum AbLegacyDataType
{
    /// <summary>B-file single bit (<c>B3:0/0</c>) or bit-within-N-file (<c>N7:0/3</c>).</summary>
    Bit,
    /// <summary>N-file integer (signed 16-bit).</summary>
    Int,
    /// <summary>L-file long integer — SLC 5/05+ only (signed 32-bit).</summary>
    Long,
    /// <summary>F-file float (32-bit IEEE-754).</summary>
    Float,
    /// <summary>A-file analog integer — some older hardware (signed 16-bit, semantically like N).</summary>
    AnalogInt,
    /// <summary>ST-file string (82-byte fixed-length + length word header).</summary>
    String,
    /// <summary>Timer sub-element — caller addresses <c>.ACC</c>, <c>.PRE</c>, <c>.EN</c>, <c>.DN</c>, <c>.TT</c>.</summary>
    TimerElement,
    /// <summary>Counter sub-element — caller addresses <c>.ACC</c>, <c>.PRE</c>, <c>.CU</c>, <c>.CD</c>, <c>.DN</c>.</summary>
    CounterElement,
    /// <summary>Control sub-element — caller addresses <c>.LEN</c>, <c>.POS</c>, <c>.EN</c>, <c>.DN</c>, <c>.ER</c>.</summary>
    ControlElement,
}

/// <summary>Map a PCCC data type to the driver-surface <see cref="DriverDataType"/>.</summary>
public static class AbLegacyDataTypeExtensions
{
    public static DriverDataType ToDriverDataType(this AbLegacyDataType t) => t switch
    {
        AbLegacyDataType.Bit => DriverDataType.Boolean,
        AbLegacyDataType.Int or AbLegacyDataType.AnalogInt => DriverDataType.Int32,
        AbLegacyDataType.Long => DriverDataType.Int32,       // matches Modbus/AbCip 64→32 gap
        AbLegacyDataType.Float => DriverDataType.Float32,
        AbLegacyDataType.String => DriverDataType.String,
        AbLegacyDataType.TimerElement or AbLegacyDataType.CounterElement
            or AbLegacyDataType.ControlElement => DriverDataType.Int32,
        _ => DriverDataType.Int32,
    };
}