namespace Chernobyl.Creation
{
    /// <summary>
    /// An <see cref="IFactory{T}"/> that produces the same instance every time is invoked.
    /// </summary>
    public class StaticFactory<T> : Builder<T>, IFactory<T>
    {
        /// <param name="instance">The single instance to return on creation.</param>
        public StaticFactory(T instance)
        {
            Instance = instance;
        }

        /// <summary>
        /// Performs an implicit conversion from an instance of type <typeparamref name="T"/> to
        /// <see cref="StaticFactory{T}"/>.
        /// </summary>
        public static implicit operator StaticFactory<T>(T instance)
        {
            return new StaticFactory<T>(instance);
        }

        /// <inheritdoc />
        public T Create()
        {
            ReportCreation(Instance);
            return Instance;
        }

        /// <summary>
        /// The single instance to return on creation.
        /// </summary>
        public T Instance { get; }
    }
}