using libplctag;

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

/// <summary>
///     Maps libplctag / CIP General Status codes to OPC UA StatusCodes. Mirrors the shape of
///     <c>ModbusDriver.MapModbusExceptionToStatus</c> so Admin UI status displays stay
///     uniform across drivers.
/// </summary>
/// <remarks>
///     <para>Coverage: the CIP general-status values an AB PLC actually returns during normal
///     driver operation. Full CIP Volume 1 Appendix B lists 50+ codes; the ones here are the
///     ones that move the driver's status needle:</para>
///     <list type="bullet">
///         <item>0x00 success — OPC UA <c>Good (0)</c>.</item>
///         <item>0x04 path segment error / 0x05 path destination unknown — <c>BadNodeIdUnknown</c>
///             (tag doesn't exist).</item>
///         <item>0x06 partial data transfer — <c>GoodMoreData</c> (fragmented read underway).</item>
///         <item>0x08 service not supported — <c>BadNotSupported</c> (e.g. write on a safety
///             partition tag from a non-safety task).</item>
///         <item>0x0A / 0x13 attribute-list error / insufficient data — <c>BadOutOfRange</c>
///             (type mismatch or truncated buffer).</item>
///         <item>0x0B already in requested mode — benign, treated as <c>Good</c>.</item>
///         <item>0x0E attribute not settable — <c>BadNotWritable</c>.</item>
///         <item>0x10 device state conflict — <c>BadDeviceFailure</c> (program-mode protected
///             writes during download / test-mode transitions).</item>
///         <item>0x16 object does not exist — <c>BadNodeIdUnknown</c>.</item>
///         <item>0x1E embedded service error — unwrap to the extended status when possible.</item>
///         <item>libplctag.NET <see cref="Status"/> errors — mapped per-member by
///             <see cref="MapLibplctagStatus(Status)"/>: timeout, not-found, not-allowed, and
///             out-of-bounds get their specific OPC UA codes; the remaining transport errors
///             fold into <c>BadCommunicationError</c>.</item>
///     </list>
/// </remarks>
public static class AbCipStatusMapper
{
    public const uint Good = 0u;
    public const uint GoodMoreData = 0x00A70000u;
    public const uint BadInternalError = 0x80020000u;
    public const uint BadNodeIdUnknown = 0x80340000u;
    public const uint BadNotWritable = 0x803B0000u;
    public const uint BadOutOfRange = 0x803C0000u;
    public const uint BadNotSupported = 0x803D0000u;
    public const uint BadDeviceFailure = 0x808B0000u;
    public const uint BadCommunicationError = 0x80050000u;
    public const uint BadTimeout = 0x800A0000u;
    public const uint BadTypeMismatch = 0x80730000u;

    /// <summary>Map a CIP general-status byte to an OPC UA StatusCode.</summary>
    /// <param name="status">The CIP general-status byte value.</param>
    /// <returns>The corresponding OPC UA StatusCode.</returns>
    public static uint MapCipGeneralStatus(byte status) => status switch
    {
        0x00 => Good,
        0x04 or 0x05 => BadNodeIdUnknown,
        0x06 => GoodMoreData,
        0x08 => BadNotSupported,
        0x0A or 0x13 => BadOutOfRange,
        0x0B => Good,
        0x0E => BadNotWritable,
        0x10 => BadDeviceFailure,
        0x16 => BadNodeIdUnknown,
        _ => BadInternalError,
    };

    /// <summary>
    ///     Map a libplctag return/status code to an OPC UA StatusCode. The integer passed here
    ///     is <c>(int)Tag.GetStatus()</c> — i.e. the underlying value of the libplctag.NET
    ///     <see cref="Status"/> enum, NOT a raw native <c>PLCTAG_ERR_*</c> constant. The wrapper
    ///     renumbers the native codes into a contiguous enum, so this method switches on the
    ///     <see cref="Status"/> members directly to stay correct if the wrapper renumbers again.
    ///     <see cref="Status.Ok"/> is success; <see cref="Status.Pending"/> is an in-flight
    ///     operation; every other (negative) member is an error.
    /// </summary>
    /// <param name="status">The libplctag status code as an integer.</param>
    /// <returns>The corresponding OPC UA StatusCode.</returns>
    public static uint MapLibplctagStatus(int status) => MapLibplctagStatus((Status)status);

    /// <summary>
    ///     Map a libplctag.NET <see cref="Status"/> enum value to an OPC UA StatusCode. This is
    ///     the strongly-typed core of the mapper; the <c>int</c> overload exists only for the
    ///     <see cref="IAbCipTagRuntime.GetStatus"/> seam, which returns the boxed-as-int value.
    /// </summary>
    /// <param name="status">The libplctag Status enum value.</param>
    /// <returns>The corresponding OPC UA StatusCode.</returns>
    public static uint MapLibplctagStatus(Status status) => status switch
    {
        Status.Ok => Good,
        Status.Pending => GoodMoreData,
        Status.ErrorTimeout => BadTimeout,
        Status.ErrorNotFound or Status.ErrorNoMatch or Status.ErrorBadDevice => BadNodeIdUnknown,
        Status.ErrorNotAllowed => BadNotWritable,
        Status.ErrorOutOfBounds or Status.ErrorTooLarge or Status.ErrorTooSmall => BadOutOfRange,
        Status.ErrorUnsupported or Status.ErrorNotImplemented => BadNotSupported,
        Status.ErrorBadConnection or Status.ErrorBadGateway or Status.ErrorBadReply
            or Status.ErrorWinsock or Status.ErrorOpen or Status.ErrorClose
            or Status.ErrorRead or Status.ErrorWrite or Status.ErrorRemoteErr
            or Status.ErrorPartial or Status.ErrorAbort => BadCommunicationError,
        _ => BadCommunicationError,
    };
}