using System.Threading.Tasks;

namespace ZB.MOM.WW.CBDDC.Core.Network;

/// <summary>
/// Provides peer node configuration from an in-memory static source.
/// </summary>
public class StaticPeerNodeConfigurationProvider : IPeerNodeConfigurationProvider
{
    private PeerNodeConfiguration _configuration = new();

    /// <summary>
    /// Gets or sets the current peer node configuration.
    /// </summary>
    public PeerNodeConfiguration Configuration
    {
        get => _configuration;
        set
        {
            if (_configuration != value)
            {
                _configuration = value;
                OnConfigurationChanged(_configuration);
            }
        }
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="StaticPeerNodeConfigurationProvider"/> class.
    /// </summary>
    /// <param name="configuration">The initial peer node configuration.</param>
    public StaticPeerNodeConfigurationProvider(PeerNodeConfiguration configuration)
    {
        Configuration = configuration;
    }

    /// <summary>
    /// Occurs when the peer node configuration changes.
    /// </summary>
    public event PeerNodeConfigurationChangedEventHandler? ConfigurationChanged;

    /// <summary>
    /// Gets the current peer node configuration.
    /// </summary>
    /// <returns>A task whose result is the current configuration.</returns>
    public Task<PeerNodeConfiguration> GetConfiguration()
    {
        return Task.FromResult(Configuration);
    }

    /// <summary>
    /// Raises the <see cref="ConfigurationChanged"/> event.
    /// </summary>
    /// <param name="newConfig">The new peer node configuration.</param>
    protected virtual void OnConfigurationChanged(PeerNodeConfiguration newConfig)
    {
        ConfigurationChanged?.Invoke(this, newConfig);
    }
}