// 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.Runtime.Serialization;
using YamlDotNet.Core;
using YamlDotNet.Core.Events;
using YamlDotNet.Serialization.Utilities;

namespace YamlDotNet.Serialization.ValueDeserializers
{
    public sealed class NodeValueDeserializer : IValueDeserializer
    {
        private readonly IList<INodeDeserializer> deserializers;
        private readonly IList<INodeTypeResolver> typeResolvers;

        public NodeValueDeserializer(IList<INodeDeserializer> deserializers, IList<INodeTypeResolver> typeResolvers)
        {
            if (deserializers == null)
            {
                throw new ArgumentNullException("deserializers");
            }

            this.deserializers = deserializers;

            if (typeResolvers == null)
            {
                throw new ArgumentNullException("typeResolvers");
            }
            this.typeResolvers = typeResolvers;
        }

        public object DeserializeValue (IParser parser, Type expectedType, SerializerState state, IValueDeserializer nestedObjectDeserializer)
        {
            var nodeEvent = parser.Peek<NodeEvent>();

            var nodeType = GetTypeFromEvent(nodeEvent, expectedType);

            try
            {
                foreach (var deserializer in deserializers)
                {
                    object value;
                    if (deserializer.Deserialize(parser, nodeType, (r, t) => nestedObjectDeserializer.DeserializeValue(r, t, state, nestedObjectDeserializer), out value))
                    {
                        return value;
                    }
                }
            }
            catch (YamlException)
            {
                throw;
            }
            catch (Exception ex)
            {
                throw new YamlException(nodeEvent.Start, nodeEvent.End, "Exception during deserialization", ex);
            }

            throw new YamlException(
                nodeEvent.Start,
                nodeEvent.End,
                string.Format(
                    "No node deserializer was able to deserialize the node into type {0}",
                    expectedType.AssemblyQualifiedName
                )
            );
        }

        private Type GetTypeFromEvent(NodeEvent nodeEvent, Type currentType)
        {
            foreach (var typeResolver in typeResolvers)
            {
                if (typeResolver.Resolve(nodeEvent, ref currentType))
                {
                    break;
                }
            }
            return currentType;
        }
    }
}
