using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.Serialization
{
    /// <summary>
    /// Contains a collection of IDataSerializer related helper methods.
    /// </summary>
    public static class SerializationHelper
    {
        /// <summary>
        /// Gets a list of all IDataSerializer implemented types.
        /// </summary>
        /// <returns></returns>
        public static List<Type> GetSerializersTypes()
        {
            var type = typeof(IDataSerializer);
            var serializers = System.Reflection.Assembly.GetAssembly(type).GetTypes().Where(x => type.IsAssignableFrom(x) && !x.IsInterface);
            return serializers.ToList();
        }

        /// <summary>
        /// Gets a list of all IDataSerializer implemented instances.
        /// </summary>
        /// <returns></returns>
        public static List<IDataSerializer> GetSerializersInstances()
        {
            var types = GetSerializersTypes();

            List<IDataSerializer> serializers = new List<IDataSerializer>();

            foreach (var type in types)
            {
                var instance = Activator.CreateInstance(type) as IDataSerializer;
                serializers.Add(instance);
            }

            return serializers;
        }

        /// <summary>
        /// Returns a serializer instance by type name.
        /// </summary>
        /// <param name="name">Name of IDataSerializer type.</param>
        /// <returns></returns>
        public static IDataSerializer GetSerializerByName(String name)
        {
            var types = GetSerializersTypes();
            var type = types.SingleOrDefault(x => x.Name == name);
            return Activator.CreateInstance(type) as IDataSerializer;
        }

        /// <summary>
        /// Returns the name of the specified IDataSerializer.
        /// </summary>
        /// <param name="serializer">The specified IDataSerializer.</param>
        /// <returns></returns>
        public static String GetSerializerName(IDataSerializer serializer)
        {
            return serializer.GetType().Name;
        }
    }
}