using LinFu.IoC.Configuration.Interfaces;
using LinFu.IoC.Interfaces;

namespace LinFu.IoC.Interceptors
{
    /// <summary>
    ///     A <see cref="IContainerPlugin" /> implementation that inserts
    ///     <see cref="ProxyInjector" /> instances at the beginning of a <see cref="IServiceContainer" />
    ///     loading sequence.
    /// </summary>
    internal class ProxyContainerPlugin : IContainerPlugin
    {
        private readonly ProxyInjector _injector;

        /// <summary>
        ///     Initializes the class with the given <see cref="ProxyInjector" /> instance.
        /// </summary>
        /// <param name="injector">The postprocessor that will inject proxies in place of actual service requests.</param>
        internal ProxyContainerPlugin(ProxyInjector injector)
        {
            _injector = injector;
        }


        /// <summary>
        ///     Injects a <see cref="ProxyInjector" /> into the <paramref name="target">target container</paramref>.
        /// </summary>
        /// <param name="target">The service container that will hold the <see cref="ProxyInjector" />.</param>
        public void BeginLoad(IServiceContainer target)
        {
            target.PostProcessors.Add(_injector);
        }

        /// <summary>
        ///     Does absolutely nothing.
        /// </summary>
        /// <param name="target">The target container.</param>
        public void EndLoad(IServiceContainer target)
        {
            // Do nothing
        }
    }
}