using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.Serialization
{
    /// <summary>
    /// Represents a data serializer for serializing data using the light weight textual Json format.
    /// </summary>
    public class JsonDataSerializer : IDataSerializer
    {

        /// <summary>
        /// Serialize object to a file.
        /// </summary>
        /// <typeparam name="T">Type of specified object.</typeparam>
        /// <param name="obj">The specified object.</param>
        /// <param name="filePath">The full path to the file to write.</param>
        public void SerializeToFile<T>(T obj, string filePath)
        {
            using (FileStream fs = new FileStream(filePath, FileMode.Create))
            {
                SerializeToStream<T>(obj, fs);
            }
        }

        /// <summary>
        /// Deserialize object from a file.
        /// </summary>
        /// <typeparam name="T">Type of object to deserialize.</typeparam>
        /// <param name="filePath">The full path of the data file.</param>
        /// <returns>The resulting object.</returns>
        public T DeserializeFromFile<T>(string filePath)
        {
            using (FileStream fs = new FileStream(filePath, FileMode.Open))
            {
                return DeserializeFromStream<T>(fs);
            }
        }

        /// <summary>
        /// Serialize object to stream.
        /// </summary>
        /// <typeparam name="T">Type of specified object.</typeparam>
        /// <param name="obj">The specified object.</param>
        /// <param name="st">The stream to write.</param>
        public void SerializeToStream<T>(T obj, Stream st)
        {
            JsonSerializer serializer = new JsonSerializer();
            using (StreamWriter streamReader = new StreamWriter(st))
            {
                serializer.Serialize(streamReader, obj);
            }
        }

        /// <summary>
        /// Deserialize object from stream.
        /// </summary>
        /// <typeparam name="T">Type of object to deserialize.</typeparam>
        /// <param name="st">Stream to read from.</param>
        /// <returns>The resulting object.</returns>
        public T DeserializeFromStream<T>(Stream st)
        {
            JsonSerializer serializer = new JsonSerializer();
            T data;
            using (StreamReader streamReader = new StreamReader(st))
            {
                data = (T)serializer.Deserialize(streamReader, typeof(T));
            }
            return data;
        }

        /// <summary>
        /// Returns the serializer full name.
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return SerializationHelper.GetSerializerName(this);
        }

    }
}