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namespace ASC.Common.Notify.Engine;

/// <summary>
/// Provides a way to set contextual data that flows with the call and 
/// async context of a test or invocation.
/// </summary>
public static class CallContext
{
    static readonly ConcurrentDictionary<string, AsyncLocal<object>> _state = new ConcurrentDictionary<string, AsyncLocal<object>>();

    /// <summary>
    /// Stores a given object and associates it with the specified name.
    /// </summary>
    /// <param name="name">The name with which to associate the new item in the call context.</param>
    /// <param name="data">The object to store in the call context.</param>
    public static void SetData(string name, object data)
    {
        _state.GetOrAdd(name, _ => new AsyncLocal<object>()).Value = data;
    }

    /// <summary>
    /// Retrieves an object with the specified name from the <see cref="CallContext"/>.
    /// </summary>
    /// <param name="name">The name of the item in the call context.</param>
    /// <returns>The object in the call context associated with the specified name, or <see langword="null"/> if not found.</returns>
    public static object GetData(string name)
    {
        return _state.TryGetValue(name, out var data) ? data.Value : null;
    }
}