﻿//////////////////////////////////////////////////////////////////////////////////
//
// The MIT License (MIT)
//
// Copyright (c) 2014 Furry Builder
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
//////////////////////////////////////////////////////////////////////////////////

using System;
using FactorIt.Contracts;
using FluffIt;
using JetBrains.Annotations;

namespace FactorIt
{
    /// <summary>
    /// A single entry inside the container.
    /// </summary>
    /// <typeparam name="TContract">Type of the contract represented by this entry.</typeparam>
    public class Registration<TContract> : IRegistration
        where TContract : class
    {
        private readonly Lazy<object> _registration;
        private Func<TContract, TContract> _decorator;
        private Func<TContract> _factory;

        internal Registration()
        {
            _registration = new Lazy<object>(() => _decorator.SelectOrDefault(
                d => d.Invoke(_factory.Invoke()),
                _factory.Invoke()
            ));
        }

        public object Value
        {
            get { return _registration.Value; }
        }

        public bool IsValueCreated
        {
            get { return _registration.IsValueCreated; }
        }

        internal void Source([NotNull] Func<TContract> factory)
        {
            _factory = factory;
        }

        internal void Decorate([NotNull] Func<TContract, TContract> decorator)
        {
            _decorator = decorator;
        }
    }
}