using Microsoft.Extensions.Configuration;
using ZB.MOM.WW.OtOpcUa.Core.Scripting;

namespace ZB.MOM.WW.OtOpcUa.Host.Configuration;

/// <summary>
///     Binds the node-wide <c>Scripting</c> section into <see cref="ScriptingOptions"/> and clamps it
///     (<see cref="ScriptingOptions.Sanitized"/>). One place, so <c>Program.cs</c> and its unit test bind the same
///     way and a misspelled key cannot silently fall back to the compiled defaults unnoticed.
/// </summary>
public static class ScriptingOptionsBinding
{
    /// <summary>Binds and clamps the <c>Scripting</c> section.</summary>
    /// <param name="configuration">The host configuration.</param>
    /// <param name="adjustments">One line per clamped value, for the caller to log as a Warning.</param>
    /// <returns>The clamped options; the compiled defaults when the section is absent.</returns>
    public static ScriptingOptions Bind(IConfiguration configuration, out IReadOnlyList<string> adjustments)
    {
        ArgumentNullException.ThrowIfNull(configuration);
        var bound = configuration.GetSection(ScriptingOptions.SectionName).Get<ScriptingOptions>() ?? new ScriptingOptions();
        // lmxopcua#780: the seam subset lives under the runner key (Scripting:Runner:Seams), which the binder cannot
        // reach because Scripting:Runner is itself a value. Bound explicitly; an unknown seam name is a startup error,
        // like an unknown Scripting:Runner value.
        var seams = configuration.GetSection($"{ScriptingOptions.SectionName}:Runner:Seams").Get<List<ScriptSeam>>();
        if (seams is { Count: > 0 }) bound.RunnerSeams = seams;
        return bound.Sanitized(out adjustments);
    }
}