lmxopcua/tests/Core/ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests/FakeScriptContext.cs

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

namespace ZB.MOM.WW.OtOpcUa.Core.Scripting.Tests;

/// <summary>
///     In-memory <see cref="ScriptContext"/> for tests. Holds a tag dictionary + a write
///     log + a deterministic clock. Concrete subclasses in production will wire
///     GetTag/SetVirtualTag through the virtual-tag engine + driver dispatch; here they
///     hit a plain dictionary.
/// </summary>
public sealed class FakeScriptContext : ScriptContext
{
    /// <summary>Gets the dictionary of tags available in this context.</summary>
    public Dictionary<string, DataValueSnapshot> Tags { get; } = new(StringComparer.Ordinal);

    /// <summary>Gets the log of virtual tag write operations.</summary>
    public List<(string Path, object? Value)> Writes { get; } = [];

    /// <inheritdoc />
    public override DateTime Now { get; } = new DateTime(2026, 1, 1, 12, 0, 0, DateTimeKind.Utc);

    /// <inheritdoc />
    public override ILogger Logger { get; } = new LoggerConfiguration().CreateLogger();

    /// <inheritdoc />
    public override DataValueSnapshot GetTag(string path)
    {
        return Tags.TryGetValue(path, out var v)
            ? v
            : new DataValueSnapshot(null, 0x80340000u, null, Now); // BadNodeIdUnknown
    }

    /// <inheritdoc />
    public override void SetVirtualTag(string path, object? value)
    {
        Writes.Add((path, value));
    }

    /// <summary>Seeds the context with a tag value for testing.</summary>
    /// <param name="path">The tag path.</param>
    /// <param name="value">The tag value.</param>
    /// <param name="statusCode">The OPC UA status code (default: 0).</param>
    /// <param name="sourceTs">The source timestamp (default: <see cref="Now"/>).</param>
    /// <returns>This instance for method chaining.</returns>
    public FakeScriptContext Seed(string path, object? value,
        uint statusCode = 0u, DateTime? sourceTs = null)
    {
        Tags[path] = new DataValueSnapshot(value, statusCode, sourceTs ?? Now, Now);
        return this;
    }
}