using Opc.Ua;

namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Helpers;

/// <summary>
///     Parses node ID strings into OPC UA <see cref="NodeId" /> objects.
///     Supports standard OPC UA format (e.g., "ns=2;s=MyNode", "i=85") and bare numeric IDs.
/// </summary>
public static class NodeIdParser
{
    /// <summary>
    ///     Parses a string into a <see cref="NodeId" />. Returns <c>null</c> if the input is null or empty.
    /// </summary>
    /// <param name="nodeIdString">The node ID string to parse.</param>
    /// <returns>A parsed <see cref="NodeId" />, or <c>null</c> if input is null/empty.</returns>
    /// <exception cref="FormatException">Thrown when the string cannot be parsed as a valid NodeId.</exception>
    public static NodeId? Parse(string? nodeIdString)
    {
        if (string.IsNullOrWhiteSpace(nodeIdString))
            return null;

        var trimmed = nodeIdString.Trim();

        // Standard OPC UA format: ns=X;s=..., ns=X;i=..., ns=X;g=..., ns=X;b=...
        // Also: s=..., i=..., g=..., b=... (namespace 0 implied)
        if (trimmed.Contains('='))
            try
            {
                return NodeId.Parse(trimmed);
            }
            catch (Exception ex)
            {
                throw new FormatException($"Invalid node ID format: '{nodeIdString}'", ex);
            }

        // Bare numeric: treat as namespace 0, numeric identifier
        if (uint.TryParse(trimmed, out var numericId)) return new NodeId(numericId);

        throw new FormatException(
            $"Invalid node ID format: '{nodeIdString}'. Expected format like 'ns=2;s=MyNode', 'i=85', or a numeric ID.");
    }

    /// <summary>
    ///     Parses a string into a <see cref="NodeId" />, throwing if the input is null or empty.
    /// </summary>
    /// <param name="nodeIdString">The node ID string to parse.</param>
    /// <returns>A parsed <see cref="NodeId" />.</returns>
    /// <exception cref="ArgumentException">Thrown when the input is null or empty.</exception>
    /// <exception cref="FormatException">Thrown when the string cannot be parsed as a valid NodeId.</exception>
    public static NodeId ParseRequired(string? nodeIdString)
    {
        var result = Parse(nodeIdString);
        if (result == null)
            throw new ArgumentException("Node ID is required but was not provided.");
        return result;
    }
}