// This file is part of YamlDotNet - A .NET library for YAML.
// Copyright (c) Antoine Aubry and contributors
//
// 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 System.Collections.Generic;
using System.Linq;

namespace YamlDotNet.Serialization.Utilities
{
    /// <summary>
    /// A generic container that is preserved during the entire deserialization process.
    /// Any disposable object added to this collection will be disposed when this object is disposed.
    /// </summary>
    public sealed class SerializerState : IDisposable
    {
        private readonly IDictionary<Type, object> items = new Dictionary<Type, object>();

        public T Get<T>()
            where T : class, new()
        {
            if (!items.TryGetValue(typeof(T), out var value))
            {
                value = new T();
                items.Add(typeof(T), value);
            }
            return (T)value;
        }

        /// <summary>
        /// Invokes <see cref="IPostDeserializationCallback.OnDeserialization" /> on all
        /// objects added to this collection that implement <see cref="IPostDeserializationCallback" />.
        /// </summary>
        public void OnDeserialization()
        {
            foreach (var callback in items.Values.OfType<IPostDeserializationCallback>())
            {
                callback.OnDeserialization();
            }
        }

        public void Dispose()
        {
            foreach (var disposable in items.Values.OfType<IDisposable>())
            {
                disposable.Dispose();
            }
        }
    }
}