/* Copyright 2010-2016 MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

using System;
using System.Reflection;

namespace MongoDB.Bson.Serialization
{
    /// <summary>
    /// Represents the class map serialization provider.
    /// </summary>
    internal class BsonClassMapSerializationProvider : BsonSerializationProviderBase
    {
        /// <inheritdoc/>
        public override IBsonSerializer GetSerializer(Type type, IBsonSerializerRegistry serializerRegistry)
        {
            if (type == null)
            {
                throw new ArgumentNullException("type");
            }
            var typeInfo = type.GetTypeInfo();
            if (typeInfo.IsGenericType && typeInfo.ContainsGenericParameters)
            {
                var message = string.Format("Generic type {0} has unassigned type parameters.", BsonUtils.GetFriendlyTypeName(type));
                throw new ArgumentException(message, "type");
            }

            if ((typeInfo.IsClass || (typeInfo.IsValueType && !typeInfo.IsPrimitive)) &&
                !typeof(Array).GetTypeInfo().IsAssignableFrom(type) &&
                !typeof(Enum).GetTypeInfo().IsAssignableFrom(type))
            {
                var classMap = BsonClassMap.LookupClassMap(type);
                var classMapSerializerDefinition = typeof(BsonClassMapSerializer<>);
                var classMapSerializerType = classMapSerializerDefinition.MakeGenericType(type);
                return (IBsonSerializer)Activator.CreateInstance(classMapSerializerType, classMap);
            }

            return null;
        }
    }
}